Split internal/web into subpackages before domain-admin growth.

Lay out view, auth, validate, and handlers under internal/web while keeping
the cmd/panel API unchanged; update roadmap and changelog for web-split closure.

Co-authored-by: Cursor <cursoragent@cursor.com>

CHANGELOG.md

@@ -5,6 +5,13 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); version
 
 ## [Unreleased]
 
+### Changed
+
+- `internal/web` split into subpackages (`web/view`, `web/auth`, `web/validate`,
+  `web/handlers`); the composition root (`web.New`, `web.Config`, `Server.Handler`)
+  is unchanged for `cmd/panel`. Templates and static assets moved under
+  `internal/web/view/`.
+
 ### Added
 
 - panel: DMARC guidance for send-only relays — the suggested `_dmarc` record

docs/architecture.md

@@ -188,10 +188,10 @@ holds the cookie works after process restart, redeploy, or full backup restore.
 - **Idle timeout** — sliding window, `PANEL_SESSION_IDLE_DAYS` (default 7); no
   absolute cap (regular use keeps the session alive indefinitely).
 - **Renewal** — DB `last_seen` and cookie `Max-Age` update at most once per hour
-  (`renewThreshold` in [internal/web/session.go](../internal/web/session.go)).
+  (`renewThreshold` in [internal/web/auth/session.go](../internal/web/auth/session.go)).
 - **Password change** — all other sessions are deleted; the current session stays
   active ([internal/store/sessions.go](../internal/store/sessions.go),
-  [handlers_account.go](../internal/web/handlers_account.go)).
+  [handlers_account.go](../internal/web/handlers/handlers_account.go)).
 
 Restoring an **older** backup also restores session rows: a session invalidated
 after that backup was taken can become valid again if the browser still has the
@@ -218,7 +218,15 @@ flowchart TB
     backupcli["selfpost-backup CLI"]
   end
   subgraph web ["internal/web — HTTP surface"]
-    handlers["handlers_*.go, templates, session/security"]
+    webRoot["web.go — router, security"]
+    viewPkg["web/view — templates, static"]
+    authPkg["web/auth — session, login, setup"]
+    handlersPkg["web/handlers — authenticated pages"]
+    webRoot --> viewPkg
+    webRoot --> authPkg
+    webRoot --> handlersPkg
+    handlersPkg --> authPkg
+    handlersPkg --> viewPkg
   end
   subgraph services ["Services — multi-store operations + rollback"]
     domainSvc["internal/domain"]

docs/development.md

@@ -112,7 +112,7 @@ the tree are AGPL-3.0-compatible.
 
 | Asset | Version | Repository | License |
 |---|---|---|---|
-| `internal/web/static/htmx.min.js` | 2.0.4 | <https://github.com/bigskysoftware/htmx> | 0BSD |
+| `internal/web/view/static/htmx.min.js` | 2.0.4 | <https://github.com/bigskysoftware/htmx> | 0BSD |
 
 ### E2e module (`test/e2e/go.mod`)
 
@@ -354,7 +354,7 @@ to prose.
 | Mail path | [build/postfix-config.sh](../build/postfix-config.sh) |
 | Panel routes | [internal/web/web.go](../internal/web/web.go) |
 | Backup / restore, domain export | [internal/backup/](../internal/backup/), [cmd/selfpost-backup/](../cmd/selfpost-backup/) |
-| Sessions | [internal/store/sessions.go](../internal/store/sessions.go), [internal/web/session.go](../internal/web/session.go) |
+| Sessions | [internal/store/sessions.go](../internal/store/sessions.go), [internal/web/auth/session.go](../internal/web/auth/session.go) |
 | Log rotation, reload | [build/logrotate-mail.conf](../build/logrotate-mail.conf), [build/logrotate-loop.sh](../build/logrotate-loop.sh), [build/postfix-cert-reload.sh](../build/postfix-cert-reload.sh) |
 | Deploy | [deploy/docker-compose.yml](../deploy/docker-compose.yml), [build/Dockerfile](../build/Dockerfile) |
 | Operator checklist | [§ User-facing deliverables](#user-facing-deliverables); detail — [guide.md](guide.md) |

docs/plans/domain-admin.md

@@ -23,7 +23,7 @@ list:
   deletion, its own L2 limit);
 - the domain's DKIM/DNS status;
 - the send log filtered to the domain — the filter already exists in the log
-  ([sendLogData](../../internal/web/handlers_monitor.go)).
+  ([sendLogData](../../internal/web/handlers/handlers_monitor.go)).
 
 What stays outside the role is what is global by nature:
 

docs/plans/web-split.md

@@ -1,6 +1,6 @@
 # Plan: web-split (splitting `internal/web`)
 
-**Status:** agreed  
+**Status:** done (see [CHANGELOG](../CHANGELOG.md) `[Unreleased]`)  
 **Version:** `1.x`; an internal refactor, it does not force a break on its own.
 
 ---
@@ -42,11 +42,25 @@ domains. The refactor is cheaper before that growth than after it.
 
 The order is a recommendation, not a blocker.
 
+## Chosen scheme
+
+**Horizontal split into four packages** (decided at implementation):
+
+```
+internal/web/          # Config, Server, New, Handler — composition root; security.go
+internal/web/view/     # embed templates/static, render/renderFragment, staticHandler
+internal/web/auth/     # session, login/logout/setup, requireAuth, currentUser
+internal/web/validate/ # shared form validation (avoids auth ↔ handlers import cycle)
+internal/web/handlers/ # all authenticated page handlers (handlers_*.go)
+```
+
+`cmd/panel` keeps importing only `internal/web`. Subpackages are not exported
+beyond what the composition root needs.
+
 ## Done when
 
-The decision is made deliberately when the work starts — either the package is
-split along the chosen scheme, or it is settled that it stays flat. After a
-split: `build`/`vet`/`test` green, the panel's behaviour unchanged.
+The package is split along the scheme above. After the split: `build`/`vet`/`test`
+green, the panel's behaviour unchanged.
 
 ## Risks
 

docs/roadmap.md

@@ -26,17 +26,15 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
 
 | ID | Topic | Status | Plan |
 |---|---|---|---|
-| web-split | Splitting `internal/web` | **agreed** | [plans/web-split.md](plans/web-split.md) |
 | domain-admin | Domain administrator role | **agreed** | [plans/domain-admin.md](plans/domain-admin.md) |
 | inbound-relay | Inbound relay (backup-MX / forwarding) | **agreed** | [plans/inbound-relay.md](plans/inbound-relay.md) |
 | contributing | `CONTRIBUTING.md` | candidate | — |
 | visual-style | Обновление визуального стиля | candidate | — |
 | dmarc-reports | DMARC aggregate report ingestion and panel UI | candidate | [plans/dmarc-reports.md](plans/dmarc-reports.md) |
 
-**Recommended order** (not binding): **web-split → domain-admin →
-inbound-relay** — first the package split, then role-wide authorisation, then
-the new vertical slice of the inbound relay. Deviating is allowed; there are no
-hard phases here.
+**Recommended order** (not binding): **domain-admin →
+inbound-relay** — role-wide authorisation first, then the inbound relay vertical
+slice. Deviating is allowed; there are no hard phases here.
 
 After a context reset, pick an item marked `agreed` or `in progress`, then work
 the checklist in its linked plan.
@@ -59,8 +57,7 @@ engine stays outside the image, only the attachment point is provided.
 
 **Dependencies / risks:** a finished outbound path; open relay and backscatter;
 a wider attack surface (port 25 accepting mail).
-**Order:** recommended after [web-split](plans/web-split.md) and
-[domain-admin](plans/domain-admin.md).
+**Order:** recommended after [domain-admin](plans/domain-admin.md).
 **Version:** target bump `1.x`; `2.x` possible — to be settled once the
 implementation lands.
 
@@ -80,32 +77,13 @@ assigned domains (one or several).
 **Done when:** see [plans/domain-admin.md](plans/domain-admin.md).
 
 **Dependencies / risks:** a users table, the role in the session, authorisation
-in every handler, setup and backup. **Order:** recommended after
-[web-split](plans/web-split.md), before
+in every handler, setup and backup. **Order:** recommended **before**
 [inbound-relay](plans/inbound-relay.md).
 **Version:** `1.x` MINOR, given a compatible migration of the current
 administrator into a global one.
 
 ---
 
-## web-split
-
-**Goal:** deliberately split `internal/web` (or settle on keeping the package
-flat) before it grows under inbound-relay and domain-admin.
-
-**Boundary:** an internal refactor; the panel's behaviour for the operator does
-not change.
-
-**Done when:** the package is split along the chosen scheme, or it is settled
-that it stays flat — see [plans/web-split.md](plans/web-split.md).
-
-**Dependencies / risks:** exporting a package-private API. **Order:**
-recommended **first** among the agreed features (before domain-admin and
-inbound-relay).
-**Version:** `1.x`; on its own it does not force a break.
-
----
-
 ## contributing
 
 **Goal:** `CONTRIBUTING.md` in the root — the dev loop, the checks to run

internal/web/auth/auth.go

@@ -0,0 +1,122 @@
+// Package auth implements the panel's login sessions, one-time setup flow,
+// and authentication middleware.
+package auth
+
+import (
+	"log"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/view"
+)
+
+// Config holds auth-specific panel configuration.
+type Config struct {
+	CookieSecure      bool
+	Hostname          string
+	SessionIdleDays   int
+	TrustedProxyCIDRs []*net.IPNet
+}
+
+// Module handles login, logout, setup, and session middleware.
+type Module struct {
+	store    *store.Store
+	cfg      Config
+	view     *view.Engine
+	sessions *sessionStore
+	setup    *setupManager
+
+	loginLimiter *rateLimiter
+	setupLimiter *rateLimiter
+
+	trustedProxies []*net.IPNet
+}
+
+// New builds the auth module. setupTokenPath is where the current setup token
+// is mirrored on disk (security.md).
+func New(st *store.Store, cfg Config, v *view.Engine, setupTokenPath string) *Module {
+	idleDays := cfg.SessionIdleDays
+	if idleDays <= 0 {
+		idleDays = 7
+	}
+	m := &Module{
+		store:          st,
+		cfg:            cfg,
+		view:           v,
+		sessions:       newSessionStore(st, time.Duration(idleDays)*24*time.Hour),
+		setupLimiter:   newRateLimiter(10, time.Minute),
+		loginLimiter:   newRateLimiter(10, 15*time.Minute),
+		trustedProxies: cfg.TrustedProxyCIDRs,
+	}
+	m.setup = newSetupManager(st, cfg.Hostname, setupTokenPath)
+	return m
+}
+
+// Bootstrap runs once at startup. If setup is not complete it mints and
+// announces the first setup token (security.md).
+func (m *Module) Bootstrap() error {
+	return m.setup.bootstrap()
+}
+
+// AllowLoginAttempt reports whether a login or account-password change attempt
+// from r is within the rate limit (security.md).
+func (m *Module) AllowLoginAttempt(r *http.Request) bool {
+	return m.loginLimiter.Allow(clientIP(r, m.trustedProxies))
+}
+
+// SessionToken returns the session token the request carries, if exactly one
+// cookie of that name is present.
+func (m *Module) SessionToken(r *http.Request) (string, bool) {
+	return m.sessionToken(r)
+}
+
+// RenameSession updates the username carried by a session.
+func (m *Module) RenameSession(token, username string) {
+	m.sessions.Rename(token, username)
+}
+
+// DestroyOtherSessions invalidates every session except keep.
+func (m *Module) DestroyOtherSessions(keep string) {
+	m.sessions.DestroyOthers(keep)
+}
+
+func logf(format string, args ...any) {
+	log.Printf(format, args...)
+}
+
+// clientIP extracts the peer IP for rate-limiting. By default it is the
+// transport peer (RemoteAddr), which cannot be spoofed. If RemoteAddr matches
+// one of trustedProxies, the last entry of X-Forwarded-For is used instead —
+// that is the address the trusted proxy itself appended, so a client can't
+// forge it by sending its own XFF header.
+func clientIP(r *http.Request, trustedProxies []*net.IPNet) string {
+	host, _, err := net.SplitHostPort(r.RemoteAddr)
+	if err != nil {
+		host = r.RemoteAddr
+	}
+
+	if len(trustedProxies) > 0 {
+		if peer := net.ParseIP(host); peer != nil && ipInAny(peer, trustedProxies) {
+			if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
+				parts := strings.Split(xff, ",")
+				if ip := net.ParseIP(strings.TrimSpace(parts[len(parts)-1])); ip != nil {
+					return ip.String()
+				}
+			}
+		}
+	}
+
+	return host
+}
+
+func ipInAny(ip net.IP, nets []*net.IPNet) bool {
+	for _, n := range nets {
+		if n.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}

internal/web/auth/auth_test.go

@@ -1,72 +1,95 @@
-package web
+package auth
 
 import (
 	"net/http"
 	"net/http/httptest"
+	"path/filepath"
 	"strings"
 	"testing"
+	"time"
+
+	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/view"
 )
 
-// The __Host- prefix is only valid on a Secure cookie: getting this condition
-// backwards would make the development instance fail to log in at all, and
-// silently — the browser discards the Set-Cookie and the panel just shows the
-// login form again.
+func newTestSessionStore(t *testing.T) *sessionStore {
+	t.Helper()
+	st, err := store.Open(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatalf("open store: %v", err)
+	}
+	t.Cleanup(func() { st.Close() })
+	return newSessionStore(st, 7*24*time.Hour)
+}
+
+func mustView(t *testing.T) *view.Engine {
+	t.Helper()
+	v, err := view.New("test")
+	if err != nil {
+		t.Fatalf("view: %v", err)
+	}
+	return v
+}
+
+func testModule(t *testing.T, cookieSecure bool) *Module {
+	t.Helper()
+	st, err := store.Open(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatalf("open store: %v", err)
+	}
+	t.Cleanup(func() { st.Close() })
+	return New(st, Config{CookieSecure: cookieSecure}, mustView(t), "")
+}
+
 func TestSessionCookieNameFollowsCookieSecure(t *testing.T) {
-	secure := &Server{cfg: Config{CookieSecure: true}}
+	secure := testModule(t, true)
 	if got := secure.sessionCookie(); got != "__Host-selfpost_session" {
 		t.Errorf("with TLS the cookie is named %q, want the __Host- prefixed name", got)
 	}
-	plain := &Server{cfg: Config{CookieSecure: false}}
+	plain := testModule(t, false)
 	if got := plain.sessionCookie(); got != "selfpost_session" {
 		t.Errorf("without TLS the cookie is named %q, want the bare name", got)
 	}
 }
 
-// A neighbouring host on the same registrable domain can set a cookie by the
-// same name; the browser then sends both, oldest first. Picking one at random
-// would leave the administrator in a login loop with no explanation, so the
-// request counts as signed out instead.
 func TestSessionTokenRejectsDuplicates(t *testing.T) {
-	s := &Server{cfg: Config{CookieSecure: false}}
+	m := testModule(t, false)
 	r := httptest.NewRequest(http.MethodGet, "http://panel.example.com/domains", nil)
 	r.AddCookie(&http.Cookie{Name: "selfpost_session", Value: "planted-by-a-neighbour"})
 	r.AddCookie(&http.Cookie{Name: "selfpost_session", Value: "the-real-session"})
 
-	if token, ok := s.sessionToken(r); ok {
+	if token, ok := m.sessionToken(r); ok {
 		t.Fatalf("duplicate cookies accepted, token = %q", token)
 	}
 }
 
 func TestSessionTokenReadsOneCookie(t *testing.T) {
-	s := &Server{cfg: Config{CookieSecure: true}}
+	m := testModule(t, true)
 	r := httptest.NewRequest(http.MethodGet, "http://panel.example.com/domains", nil)
 	r.AddCookie(&http.Cookie{Name: "__Host-selfpost_session", Value: "the-real-session"})
 
-	token, ok := s.sessionToken(r)
+	token, ok := m.sessionToken(r)
 	if !ok || token != "the-real-session" {
 		t.Fatalf("sessionToken = %q, %t; want the cookie's value", token, ok)
 	}
 }
 
-// A cookie under the other deployment's name is not this deployment's session:
-// after an upgrade the pre-14 cookie must not be honoured as if it were the
-// prefixed one.
 func TestSessionTokenIgnoresTheOtherName(t *testing.T) {
-	s := &Server{cfg: Config{CookieSecure: true}}
+	m := testModule(t, true)
 	r := httptest.NewRequest(http.MethodGet, "http://panel.example.com/domains", nil)
 	r.AddCookie(&http.Cookie{Name: "selfpost_session", Value: "left-over-from-an-older-build"})
 
-	if _, ok := s.sessionToken(r); ok {
+	if _, ok := m.sessionToken(r); ok {
 		t.Fatal("the unprefixed cookie was accepted on a TLS deployment")
 	}
 }
 
 func TestRequireAuthRejectsDuplicateCookies(t *testing.T) {
-	s := &Server{cfg: Config{CookieSecure: false}, sessions: newTestSessionStore(t)}
-	token := s.sessions.Create("admin")
+	m := testModule(t, false)
+	token := m.sessions.Create("admin")
 
 	reached := false
-	h := s.requireAuth(http.HandlerFunc(func(http.ResponseWriter, *http.Request) { reached = true }))
+	h := m.RequireAuth(http.HandlerFunc(func(http.ResponseWriter, *http.Request) { reached = true }))
 
 	r := httptest.NewRequest(http.MethodGet, "http://panel.example.com/domains", nil)
 	r.AddCookie(&http.Cookie{Name: "selfpost_session", Value: "planted-by-a-neighbour"})
@@ -82,19 +105,17 @@ func TestRequireAuthRejectsDuplicateCookies(t *testing.T) {
 	}
 }
 
-// Signing out has to expire the cookie under both names, or the cookie left
-// over from a pre-__Host- build stays in the browser for the rest of its life.
 func TestLogoutClearsBothCookieNames(t *testing.T) {
-	s := &Server{cfg: Config{CookieSecure: true}, sessions: newTestSessionStore(t)}
-	token := s.sessions.Create("admin")
+	m := testModule(t, true)
+	token := m.sessions.Create("admin")
 
 	r := httptest.NewRequest(http.MethodPost, "http://panel.example.com/logout", nil)
 	r.Host = "panel.example.com"
 	r.AddCookie(&http.Cookie{Name: "__Host-selfpost_session", Value: token})
 	rec := httptest.NewRecorder()
-	s.handleLogout(rec, r)
+	m.HandleLogout(rec, r)
 
-	if _, ok := s.sessions.Lookup(token); ok {
+	if _, ok := m.sessions.Lookup(token); ok {
 		t.Error("the session survived sign-out")
 	}
 	set := rec.Header().Values("Set-Cookie")
@@ -110,3 +131,59 @@ func TestLogoutClearsBothCookieNames(t *testing.T) {
 		}
 	}
 }
+
+func TestSessionRename(t *testing.T) {
+	s := newTestSessionStore(t)
+	token := s.Create("admin")
+
+	s.Rename(token, "operator")
+
+	name, ok := s.Lookup(token)
+	if !ok {
+		t.Fatal("session lost after rename")
+	}
+	if name != "operator" {
+		t.Fatalf("session username = %q, want %q", name, "operator")
+	}
+}
+
+func TestSessionDestroyOthers(t *testing.T) {
+	s := newTestSessionStore(t)
+	keep := s.Create("admin")
+	other := s.Create("admin")
+
+	s.DestroyOthers(keep)
+
+	if _, ok := s.Lookup(keep); !ok {
+		t.Fatal("current session was destroyed")
+	}
+	if _, ok := s.Lookup(other); ok {
+		t.Fatal("other session survived")
+	}
+}
+
+func TestSessionLookupRejectsExpired(t *testing.T) {
+	s := newTestSessionStore(t)
+	s.idle = -time.Minute
+	token := s.Create("admin")
+
+	if _, ok := s.Lookup(token); ok {
+		t.Fatal("expired session was accepted")
+	}
+}
+
+func TestSessionTouchThrottled(t *testing.T) {
+	s := newTestSessionStore(t)
+	token := s.Create("admin")
+
+	if s.Touch(token) {
+		t.Fatal("touch renewed a session created moments ago")
+	}
+
+	if err := s.store.RenewSession(hashToken(token), time.Now().Add(-2*time.Hour).Add(s.idle)); err != nil {
+		t.Fatalf("renew session: %v", err)
+	}
+	if !s.Touch(token) {
+		t.Fatal("touch did not renew a session past the throttle window")
+	}
+}

internal/web/auth/handlers.go

@@ -0,0 +1,239 @@
+package auth
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/validate"
+	"golang.org/x/crypto/bcrypt"
+)
+
+const (
+	sessionCookieBase     = "selfpost_session"
+	sessionCookiePrefixed = "__Host-" + sessionCookieBase
+)
+
+func (m *Module) sessionCookie() string {
+	if m.cfg.CookieSecure {
+		return sessionCookiePrefixed
+	}
+	return sessionCookieBase
+}
+
+func (m *Module) sessionToken(r *http.Request) (string, bool) {
+	name := m.sessionCookie()
+	var token string
+	var n int
+	for _, c := range r.Cookies() {
+		if c.Name == name {
+			n++
+			token = c.Value
+		}
+	}
+	switch n {
+	case 0:
+		return "", false
+	case 1:
+		return token, true
+	default:
+		logf("panel: %s %s carries %d cookies named %q — treating the request as signed out; "+
+			"another host on this domain is overwriting the session cookie, clear the cookies for the parent domain",
+			r.Method, r.URL.Path, n, name)
+		return "", false
+	}
+}
+
+func (m *Module) clearSessionCookies(w http.ResponseWriter) {
+	for _, name := range []string{sessionCookieBase, sessionCookiePrefixed} {
+		http.SetCookie(w, &http.Cookie{
+			Name:     name,
+			Value:    "",
+			Path:     "/",
+			MaxAge:   -1,
+			HttpOnly: true,
+			Secure:   m.cfg.CookieSecure || name == sessionCookiePrefixed,
+			SameSite: http.SameSiteLaxMode,
+		})
+	}
+}
+
+// HandleLogin serves the login form (GET) and authenticates (POST).
+func (m *Module) HandleLogin(w http.ResponseWriter, r *http.Request) {
+	exists, err := m.store.AdminExists()
+	if err != nil {
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	if !exists {
+		m.view.Render(w, http.StatusOK, "login", map[string]any{
+			"Title":     "SelfPost — Sign in",
+			"Active":    "login",
+			"SetupHint": true,
+		})
+		return
+	}
+
+	switch r.Method {
+	case http.MethodGet:
+		m.renderLogin(w, http.StatusOK, "")
+	case http.MethodPost:
+		m.submitLogin(w, r)
+	default:
+		w.Header().Set("Allow", "GET, POST")
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+func (m *Module) renderLogin(w http.ResponseWriter, status int, formErr string) {
+	m.view.Render(w, status, "login", map[string]any{
+		"Title":  "SelfPost — Sign in",
+		"Active": "login",
+		"Error":  formErr,
+	})
+}
+
+func (m *Module) submitLogin(w http.ResponseWriter, r *http.Request) {
+	if !m.loginLimiter.Allow(clientIP(r, m.trustedProxies)) {
+		m.renderLogin(w, http.StatusTooManyRequests, "Too many attempts. Please wait and try again.")
+		return
+	}
+	if err := r.ParseForm(); err != nil {
+		m.renderLogin(w, http.StatusBadRequest, "Invalid form submission.")
+		return
+	}
+	username := strings.TrimSpace(r.PostFormValue("username"))
+	password := r.PostFormValue("password")
+
+	admin, err := m.store.GetAdmin()
+	if err != nil {
+		if !errors.Is(err, store.ErrNoAdmin) {
+			logf("panel: login: get admin failed: %v", err)
+		}
+		m.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
+		return
+	}
+
+	pwErr := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(password))
+	if username != admin.Username || pwErr != nil {
+		m.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
+		return
+	}
+
+	token := m.sessions.Create(admin.Username)
+	m.setSessionCookie(w, token)
+	http.Redirect(w, r, "/", http.StatusSeeOther)
+}
+
+func (m *Module) setSessionCookie(w http.ResponseWriter, token string) {
+	http.SetCookie(w, &http.Cookie{
+		Name:     m.sessionCookie(),
+		Value:    token,
+		Path:     "/",
+		MaxAge:   m.sessions.MaxAge(),
+		HttpOnly: true,
+		Secure:   m.cfg.CookieSecure,
+		SameSite: http.SameSiteLaxMode,
+	})
+}
+
+// HandleLogout destroys the session and clears the cookie.
+func (m *Module) HandleLogout(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		w.Header().Set("Allow", "POST")
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+	name := m.sessionCookie()
+	for _, c := range r.Cookies() {
+		if c.Name == name {
+			m.sessions.Destroy(c.Value)
+		}
+	}
+	m.clearSessionCookies(w)
+	http.Redirect(w, r, "/login", http.StatusSeeOther)
+}
+
+// HandleSetup serves the one-time administrator creation flow at
+// /setup/<token> (security.md).
+func (m *Module) HandleSetup(w http.ResponseWriter, r *http.Request) {
+	if !m.setupLimiter.Allow(clientIP(r, m.trustedProxies)) {
+		http.Error(w, "too many requests", http.StatusTooManyRequests)
+		return
+	}
+
+	token := strings.TrimPrefix(r.URL.Path, "/setup/")
+	if token == "" || strings.Contains(token, "/") {
+		http.NotFound(w, r)
+		return
+	}
+	if !m.setup.validate(token) {
+		http.NotFound(w, r)
+		return
+	}
+
+	switch r.Method {
+	case http.MethodGet:
+		m.renderSetupForm(w, http.StatusOK, token, "")
+	case http.MethodPost:
+		m.submitSetup(w, r, token)
+	default:
+		w.Header().Set("Allow", "GET, POST")
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+func (m *Module) renderSetupForm(w http.ResponseWriter, status int, token, formErr string) {
+	m.view.Render(w, status, "setup", map[string]any{
+		"Title":  "SelfPost — Create administrator",
+		"Active": "setup",
+		"Token":  token,
+		"Error":  formErr,
+	})
+}
+
+func (m *Module) submitSetup(w http.ResponseWriter, r *http.Request, token string) {
+	if err := r.ParseForm(); err != nil {
+		m.renderSetupForm(w, http.StatusBadRequest, token, "Invalid form submission.")
+		return
+	}
+	username := strings.TrimSpace(r.PostFormValue("username"))
+	password := r.PostFormValue("password")
+	confirm := r.PostFormValue("password_confirm")
+
+	if err := validate.Username(username); err != nil {
+		m.renderSetupForm(w, http.StatusBadRequest, token, err.Error())
+		return
+	}
+	if password != confirm {
+		m.renderSetupForm(w, http.StatusBadRequest, token, "Passwords do not match.")
+		return
+	}
+	if err := validate.AdminPassword(password); err != nil {
+		m.renderSetupForm(w, http.StatusBadRequest, token, err.Error())
+		return
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		logf("panel: setup: hashing password failed: %v", err)
+		m.renderSetupForm(w, http.StatusInternalServerError, token, "Internal error. Please try again.")
+		return
+	}
+
+	if err := m.store.CreateAdmin(username, string(hash)); err != nil {
+		if exists, _ := m.store.AdminExists(); exists {
+			m.setup.complete()
+			http.Redirect(w, r, "/login", http.StatusSeeOther)
+			return
+		}
+		logf("panel: setup: create admin failed: %v", err)
+		m.renderSetupForm(w, http.StatusInternalServerError, token, "Internal error. Please try again.")
+		return
+	}
+
+	m.setup.complete()
+	logf("panel: administrator %q created; setup link is now disabled", username)
+	http.Redirect(w, r, "/login", http.StatusSeeOther)
+}

internal/web/auth/middleware.go

@@ -0,0 +1,45 @@
+package auth
+
+import (
+	"context"
+	"net/http"
+)
+
+type ctxKey int
+
+const usernameKey ctxKey = 0
+
+// RequireAuth wraps a handler so only requests with a valid session cookie
+// reach it; everyone else is redirected to the login page. The authenticated
+// username is stashed in the request context for downstream handlers.
+func (m *Module) RequireAuth(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		token, ok := m.sessionToken(r)
+		if !ok {
+			http.Redirect(w, r, "/login", http.StatusSeeOther)
+			return
+		}
+		username, ok := m.sessions.Lookup(token)
+		if !ok {
+			http.Redirect(w, r, "/login", http.StatusSeeOther)
+			return
+		}
+		if isSessionActivity(r) && m.sessions.Touch(token) {
+			m.setSessionCookie(w, token)
+		}
+		ctx := context.WithValue(r.Context(), usernameKey, username)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func isSessionActivity(r *http.Request) bool {
+	return !(r.Method == http.MethodGet && r.Header.Get("HX-Request") != "")
+}
+
+// CurrentUser returns the authenticated username from the request context.
+func CurrentUser(r *http.Request) string {
+	if v, ok := r.Context().Value(usernameKey).(string); ok {
+		return v
+	}
+	return ""
+}

internal/web/auth/ratelimit.go

@@ -1,4 +1,4 @@
-package web
+package auth
 
 import (
 	"sync"
@@ -6,9 +6,7 @@ import (
 )
 
 // rateLimiter is a simple fixed-window per-key counter used to throttle the
-// setup and login routes (security.md). Keys are client IPs. It is not a
-// precise sliding window — a coarse backstop against brute-force and log noise
-// is all these routes need.
+// setup and login routes (security.md). Keys are client IPs.
 type rateLimiter struct {
 	max    int
 	window time.Duration
@@ -30,8 +28,6 @@ func newRateLimiter(max int, window time.Duration) *rateLimiter {
 	}
 }
 
-// Allow records an attempt for key and reports whether it is within the limit.
-// The current window is reset lazily once it elapses.
 func (r *rateLimiter) Allow(key string) bool {
 	now := time.Now()
 	r.mu.Lock()
@@ -50,9 +46,6 @@ func (r *rateLimiter) Allow(key string) bool {
 	return true
 }
 
-// sweep drops expired buckets so the map cannot grow without bound. Called
-// under the lock while a window is being reset, which is often enough given the
-// low request volume of these routes.
 func (r *rateLimiter) sweep(now time.Time) {
 	for k, b := range r.buckets {
 		if now.After(b.windowEnds) {

internal/web/auth/session.go

@@ -1,4 +1,4 @@
-package web
+package auth
 
 import (
 	"crypto/sha256"
@@ -22,10 +22,7 @@ const renewThreshold = time.Hour
 // cookie.
 type sessionStore struct {
 	store *store.Store
-	// idle is the sliding inactivity window (PANEL_SESSION_IDLE_DAYS). There is
-	// no absolute cap: an administrator who keeps coming back stays signed in
-	// indefinitely, deliberately.
-	idle time.Duration
+	idle  time.Duration
 }
 
 func newSessionStore(st *store.Store, idle time.Duration) *sessionStore {
@@ -51,10 +48,6 @@ func (s *sessionStore) Create(username string) string {
 	if err := s.store.CreateSession(hashToken(token), username, now.Add(s.idle)); err != nil {
 		logf("panel: session: create failed: %v", err)
 	}
-	// Opportunistic cleanup: a session nobody ever came back to otherwise sits
-	// in the table forever. Piggybacking on Create (the one write every login
-	// already pays for) avoids a dedicated background sweep for what is, on a
-	// single-admin panel, a handful of rows at most.
 	if _, err := s.store.DeleteExpiredSessions(now); err != nil {
 		logf("panel: session: prune expired failed: %v", err)
 	}
@@ -86,10 +79,7 @@ func (s *sessionStore) Lookup(token string) (string, bool) {
 }
 
 // Touch extends a session's sliding expiry if it has been at least
-// renewThreshold since the last extension, and reports whether it did so —
-// the caller uses that to decide whether the response needs a fresh
-// Set-Cookie. It assumes the caller has just confirmed the session is valid
-// (e.g. via Lookup); it does nothing for a token that no longer exists.
+// renewThreshold since the last extension, and reports whether it did so.
 func (s *sessionStore) Touch(token string) bool {
 	hash := hashToken(token)
 	row, found, err := s.store.LookupSession(hash)
@@ -100,8 +90,6 @@ func (s *sessionStore) Touch(token string) bool {
 	if !found {
 		return false
 	}
-	// expiresAt = lastRenewal + idle, so this recovers when the session was
-	// last extended without a separate column.
 	lastRenewal := row.ExpiresAt.Add(-s.idle)
 	now := time.Now()
 	if now.Sub(lastRenewal) < renewThreshold {
@@ -114,19 +102,14 @@ func (s *sessionStore) Touch(token string) bool {
 	return true
 }
 
-// Rename updates the username carried by a session, keeping its expiry. It is
-// used when the administrator renames their own account so the current
-// session keeps working under the new name.
+// Rename updates the username carried by a session, keeping its expiry.
 func (s *sessionStore) Rename(token, username string) {
 	if err := s.store.RenameSession(hashToken(token), username); err != nil {
 		logf("panel: session: rename failed: %v", err)
 	}
 }
 
-// DestroyOthers invalidates every session except keep. It is called when the
-// administrator changes their password: a stolen cookie issued under the old
-// password must stop working, while the admin performing the change stays
-// signed in.
+// DestroyOthers invalidates every session except keep.
 func (s *sessionStore) DestroyOthers(keep string) {
 	if err := s.store.DeleteOtherSessions(hashToken(keep)); err != nil {
 		logf("panel: session: destroy others failed: %v", err)

internal/web/auth/setup.go

@@ -1,4 +1,4 @@
-package web
+package auth
 
 import (
 	"crypto/subtle"
@@ -32,8 +32,6 @@ func newSetupManager(st *store.Store, hostname, tokenPath string) *setupManager
 	return &setupManager{store: st, hostname: hostname, tokenPath: tokenPath}
 }
 
-// bootstrap runs once at startup. If setup is already complete it clears any
-// stale token file; otherwise it mints and announces the first token.
 func (m *setupManager) bootstrap() error {
 	done, err := m.store.AdminExists()
 	if err != nil {
@@ -49,9 +47,6 @@ func (m *setupManager) bootstrap() error {
 	return nil
 }
 
-// activeToken returns the current valid setup token, regenerating and
-// re-announcing it if none exists or it has expired. It returns ("", false)
-// once setup is complete — callers must treat that as "route gone" (404).
 func (m *setupManager) activeToken() (string, bool) {
 	done, err := m.store.AdminExists()
 	if err != nil {
@@ -69,10 +64,6 @@ func (m *setupManager) activeToken() (string, bool) {
 	return m.token, true
 }
 
-// validate reports whether provided matches the active token, using a
-// constant-time comparison to avoid leaking a correct prefix via timing
-// (security.md). A mismatch does NOT regenerate or invalidate the token: failed
-// attempts must not let an attacker DoS a legitimate setup (security.md).
 func (m *setupManager) validate(provided string) bool {
 	token, ok := m.activeToken()
 	if !ok {
@@ -81,8 +72,6 @@ func (m *setupManager) validate(provided string) bool {
 	return subtle.ConstantTimeCompare([]byte(provided), []byte(token)) == 1
 }
 
-// complete marks setup as finished: the admin row now exists, so drop the
-// in-memory token and remove the on-disk copy.
 func (m *setupManager) complete() {
 	m.mu.Lock()
 	m.token = ""
@@ -91,16 +80,12 @@ func (m *setupManager) complete() {
 	m.clearTokenFile()
 }
 
-// regenerateLocked mints a fresh token, announces it and mirrors it to disk.
-// Caller holds m.mu.
 func (m *setupManager) regenerateLocked() {
-	m.token = randomToken(16) // 128 bits of entropy (security.md)
+	m.token = randomToken(16)
 	m.expiresAt = time.Now().Add(setupTokenTTL)
 	m.announce(m.token)
 }
 
-// announce prints the setup link to the container log and writes it to the
-// token file so it can be read either way (security.md).
 func (m *setupManager) announce(token string) {
 	url := m.setupURL(token)
 	logf("panel: ==================================================================")
@@ -112,7 +97,6 @@ func (m *setupManager) announce(token string) {
 	if m.tokenPath == "" {
 		return
 	}
-	// 0600: the token is a bearer secret for creating the admin.
 	if err := os.WriteFile(m.tokenPath, []byte(url+"\n"), 0o600); err != nil {
 		logf("panel: setup: could not write token file %s: %v", m.tokenPath, err)
 	}

internal/web/auth/token.go

@@ -1,4 +1,4 @@
-package web
+package auth
 
 import (
 	"crypto/rand"

internal/web/handlers/handlers.go

@@ -0,0 +1,66 @@
+// Package handlers implements the panel's authenticated HTTP handlers.
+package handlers
+
+import (
+	"log"
+
+	"github.com/mixeme/selfpost/internal/app"
+	"github.com/mixeme/selfpost/internal/dnscheck"
+	"github.com/mixeme/selfpost/internal/domain"
+	"github.com/mixeme/selfpost/internal/health"
+	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
+	"github.com/mixeme/selfpost/internal/web/view"
+)
+
+// Config holds handler-specific panel configuration.
+type Config struct {
+	Hostname          string
+	SubmissionEnabled bool
+	MailLogPath       string
+	DataDir           string
+	DBPath            string
+	Version           string
+	TLSCertFile       string
+	OpenDKIMSocket    string
+	JournalSocket     string
+}
+
+// Handlers holds dependencies for authenticated panel routes.
+type Handlers struct {
+	store   *store.Store
+	domains *domain.Service
+	apps    *app.Service
+	cfg     Config
+	view    *view.Engine
+	dns     *dnscheck.Checker
+	machine *health.MachineSampler
+	auth    *auth.Module
+}
+
+// New builds authenticated panel handlers.
+func New(
+	st *store.Store,
+	domains *domain.Service,
+	apps *app.Service,
+	cfg Config,
+	v *view.Engine,
+	dns *dnscheck.Checker,
+	machine *health.MachineSampler,
+	a *auth.Module,
+) *Handlers {
+	return &Handlers{
+		store:   st,
+		domains: domains,
+		apps:    apps,
+		cfg:     cfg,
+		view:    v,
+		dns:     dns,
+		machine: machine,
+		auth:    a,
+	}
+}
+
+func logf(format string, args ...any) {
+	log.Printf(format, args...)
+}

internal/web/handlers/handlers_account.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"context"
@@ -9,26 +9,28 @@ import (
 
 	"github.com/mixeme/selfpost/internal/dnscheck"
 	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
+	"github.com/mixeme/selfpost/internal/web/validate"
 	"golang.org/x/crypto/bcrypt"
 )
 
-// handleAccount serves the administrator's own account settings: the username
+// HandleAccount serves the administrator's own account settings: the username
 // and password chosen during setup are the only panel credentials
 // (security.md), and until now they could be changed only by recreating the
 // state. Changing them here never touches application SASL logins, which are a
 // separate identity system (architecture.md § Mail path).
-func (s *Server) handleAccount(w http.ResponseWriter, r *http.Request) {
+func (h *Handlers) HandleAccount(w http.ResponseWriter, r *http.Request) {
 	switch r.Method {
 	case http.MethodGet:
-		admin, err := s.store.GetAdmin()
+		admin, err := h.store.GetAdmin()
 		if err != nil {
 			logf("panel: account: get admin failed: %v", err)
 			http.Error(w, "internal error", http.StatusInternalServerError)
 			return
 		}
-		s.renderAccount(w, r, http.StatusOK, "", admin.Username, admin.DMARCReportEmail)
+		h.renderAccount(w, r, http.StatusOK, "", admin.Username, admin.DMARCReportEmail)
 	case http.MethodPost:
-		s.submitAccount(w, r)
+		h.submitAccount(w, r)
 	default:
 		w.Header().Set("Allow", "GET, POST")
 		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
@@ -38,16 +40,16 @@ func (s *Server) handleAccount(w http.ResponseWriter, r *http.Request) {
 // renderAccount draws the settings form. formUsername and formDMARCEmail
 // repopulate fields after a rejected submission; password fields are never
 // repopulated.
-func (s *Server) renderAccount(w http.ResponseWriter, r *http.Request, status int, formErr, formUsername, formDMARCEmail string) {
+func (h *Handlers) renderAccount(w http.ResponseWriter, r *http.Request, status int, formErr, formUsername, formDMARCEmail string) {
 	var reportAuth dnscheck.Result
 	if hub := dnscheck.EmailDomain(formDMARCEmail); hub != "" {
 		ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
-		reportAuth = s.dns.ReportAuth(ctx, hub)
+		reportAuth = h.dns.ReportAuth(ctx, hub)
 		cancel()
 	}
-	s.render(w, status, "account", map[string]any{
+	h.view.Render(w, status, "account", map[string]any{
 		"Title":              "SelfPost — settings",
-		"User":               currentUser(r),
+		"User":               auth.CurrentUser(r),
 		"Active":             "account",
 		"FormUsername":       formUsername,
 		"FormDMARCEmail":     formDMARCEmail,
@@ -88,14 +90,14 @@ func accountFlash(r *http.Request) string {
 // out of their own panel, and the attempt is throttled on the same limiter as
 // the login form so this route cannot be used to brute-force the password past
 // that limit (security.md).
-func (s *Server) submitAccount(w http.ResponseWriter, r *http.Request) {
-	if !s.loginLimiter.Allow(clientIP(r, s.trustedProxies)) {
-		s.renderAccount(w, r, http.StatusTooManyRequests,
-			"Too many attempts. Please wait and try again.", currentUser(r), "")
+func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
+	if !h.auth.AllowLoginAttempt(r) {
+		h.renderAccount(w, r, http.StatusTooManyRequests,
+			"Too many attempts. Please wait and try again.", auth.CurrentUser(r), "")
 		return
 	}
 	if err := r.ParseForm(); err != nil {
-		s.renderAccount(w, r, http.StatusBadRequest, "Invalid form submission.", currentUser(r), "")
+		h.renderAccount(w, r, http.StatusBadRequest, "Invalid form submission.", auth.CurrentUser(r), "")
 		return
 	}
 
@@ -105,7 +107,7 @@ func (s *Server) submitAccount(w http.ResponseWriter, r *http.Request) {
 	confirm := r.PostFormValue("new_password_confirm")
 	dmarcEmail := strings.TrimSpace(r.PostFormValue("dmarc_report_email"))
 
-	admin, err := s.store.GetAdmin()
+	admin, err := h.store.GetAdmin()
 	if err != nil {
 		logf("panel: account: get admin failed: %v", err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
@@ -116,20 +118,20 @@ func (s *Server) submitAccount(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(current)); err != nil {
-		s.renderAccount(w, r, http.StatusUnauthorized, "Current password is incorrect.", username, dmarcEmail)
+		h.renderAccount(w, r, http.StatusUnauthorized, "Current password is incorrect.", username, dmarcEmail)
 		return
 	}
 
 	renaming := username != admin.Username
 	if renaming {
-		if err := validateUsername(username); err != nil {
-			s.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail)
+		if err := validate.Username(username); err != nil {
+			h.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail)
 			return
 		}
 	}
 
-	if err := validateEmail(dmarcEmail); err != nil {
-		s.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail)
+	if err := validate.Email(dmarcEmail); err != nil {
+		h.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail)
 		return
 	}
 
@@ -138,16 +140,16 @@ func (s *Server) submitAccount(w http.ResponseWriter, r *http.Request) {
 	repassword := password != "" || confirm != ""
 	if repassword {
 		if password != confirm {
-			s.renderAccount(w, r, http.StatusBadRequest, "New passwords do not match.", username, dmarcEmail)
+			h.renderAccount(w, r, http.StatusBadRequest, "New passwords do not match.", username, dmarcEmail)
 			return
 		}
-		if err := validateAdminPassword(password); err != nil {
-			s.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail)
+		if err := validate.AdminPassword(password); err != nil {
+			h.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail)
 			return
 		}
 	}
 	if !renaming && !repassword && !emailChanging {
-		s.renderAccount(w, r, http.StatusBadRequest,
+		h.renderAccount(w, r, http.StatusBadRequest,
 			"Nothing to change: enter a new username, password, or DMARC report address.", username, dmarcEmail)
 		return
 	}
@@ -157,29 +159,29 @@ func (s *Server) submitAccount(w http.ResponseWriter, r *http.Request) {
 		newHash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
 		if err != nil {
 			logf("panel: account: hashing password failed: %v", err)
-			s.renderAccount(w, r, http.StatusInternalServerError,
+			h.renderAccount(w, r, http.StatusInternalServerError,
 				"Internal error. Please try again.", username, dmarcEmail)
 			return
 		}
 		hash = string(newHash)
 	}
 
-	if err := s.store.UpdateAdmin(username, hash, dmarcEmail); err != nil {
+	if err := h.store.UpdateAdmin(username, hash, dmarcEmail); err != nil {
 		logf("panel: account: update admin failed: %v", err)
 		msg := "Could not save the changes. Please check the logs and try again."
 		if errors.Is(err, store.ErrNoAdmin) {
 			msg = "There is no administrator account to update."
 		}
-		s.renderAccount(w, r, http.StatusInternalServerError, msg, username, dmarcEmail)
+		h.renderAccount(w, r, http.StatusInternalServerError, msg, username, dmarcEmail)
 		return
 	}
 
-	if token, ok := s.sessionToken(r); ok {
+	if token, ok := h.auth.SessionToken(r); ok {
 		if renaming {
-			s.sessions.Rename(token, username)
+			h.auth.RenameSession(token, username)
 		}
 		if repassword {
-			s.sessions.DestroyOthers(token)
+			h.auth.DestroyOtherSessions(token)
 		}
 	}
 

internal/web/handlers/handlers_apps.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"errors"
@@ -10,6 +10,8 @@ import (
 	"github.com/mixeme/selfpost/internal/dnscheck"
 	"github.com/mixeme/selfpost/internal/domain"
 	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
+	"github.com/mixeme/selfpost/internal/web/validate"
 )
 
 // newCred carries a freshly generated login/password to the template so it can
@@ -48,28 +50,28 @@ type appRateLimitView struct {
 	WindowVal string // window seconds, defaulted when unset
 }
 
-// handleDomainDetail shows a single domain: its DKIM DNS record (product.md)
+// HandleDomainDetail shows a single domain: its DKIM DNS record (product.md)
 // and its applications with the controls to add, edit, delete and re-issue
 // credentials (product.md).
-func (s *Server) handleDomainDetail(w http.ResponseWriter, r *http.Request) {
-	d, ok := s.lookupDomain(w, r)
+func (h *Handlers) HandleDomainDetail(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
 	if !ok {
 		return
 	}
-	s.renderDomainDetail(w, r, http.StatusOK, d, detailView{FormMode: store.AddressModeWildcard})
+	h.renderDomainDetail(w, r, http.StatusOK, d, detailView{FormMode: store.AddressModeWildcard})
 }
 
 // renderDomainDetail renders the domain page. view supplies request-specific
 // extras (form error/values, a one-time credential); everything else is loaded
 // fresh from the stores so the page always reflects committed state.
-func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, status int, d store.Domain, view detailView) {
-	record, err := s.domains.DKIMRecord(d)
+func (h *Handlers) renderDomainDetail(w http.ResponseWriter, r *http.Request, status int, d store.Domain, view detailView) {
+	record, err := h.domains.DKIMRecord(d)
 	if err != nil {
 		logf("panel: domain %d: dkim record: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
-	apps, err := s.apps.List(d.ID)
+	apps, err := h.apps.List(d.ID)
 	if err != nil {
 		logf("panel: domain %d: list applications: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
@@ -77,7 +79,7 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 	}
 	appViews := make([]appRateLimitView, 0, len(apps))
 	for _, a := range apps {
-		rl, ok, err := s.apps.RateLimit(a.ID)
+		rl, ok, err := h.apps.RateLimit(a.ID)
 		if err != nil {
 			logf("panel: application %d: rate limit: %v", a.ID, err)
 			http.Error(w, "internal error", http.StatusInternalServerError)
@@ -92,7 +94,7 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 		})
 	}
 
-	domainRL, domainRLok, err := s.domains.RateLimit(d.ID)
+	domainRL, domainRLok, err := h.domains.RateLimit(d.ID)
 	if err != nil {
 		logf("panel: domain %d: rate limit: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
@@ -102,7 +104,7 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 	// What DNS actually publishes for the domain today, checked against the key
 	// this server signs with. Cached by the checker, so re-rendering the page
 	// after a form post costs nothing.
-	admin, err := s.store.GetAdmin()
+	admin, err := h.store.GetAdmin()
 	if err != nil {
 		logf("panel: domain %d: get admin: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
@@ -110,7 +112,7 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 	}
 	profileEmail := admin.DMARCReportEmail
 	reportEmail := dnscheck.ResolveDMARCRua(d.DMARCRua, profileEmail)
-	dns, srv := s.domainDNS(d, record, profileEmail, false)
+	dns, srv := h.domainDNS(d, record, profileEmail, false)
 	reportAuthName, reportAuthValue, needsReportAuth := dnscheck.ExternalReportAuth(d.Name, reportEmail)
 	dmarcMode := "inherit"
 	dmarcCustom := ""
@@ -132,9 +134,9 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 		dmarcSource = "settings"
 	}
 
-	s.render(w, status, "domain_detail", map[string]any{
+	h.view.Render(w, status, "domain_detail", map[string]any{
 		"Title":  "SelfPost — " + d.Name,
-		"User":   currentUser(r),
+		"User":   auth.CurrentUser(r),
 		"Active": "domains",
 		"Domain": d,
 		"Record": record,
@@ -144,7 +146,7 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 		// this server expects rather than leaving it to the documentation. The
 		// same builders phrase the suggestions in the check messages, so the
 		// page and the checks below it never recommend different records.
-		"SPFExample":   dnscheck.SPFExample(s.cfg.Hostname, srv.IPs),
+		"SPFExample":   dnscheck.SPFExample(h.cfg.Hostname, srv.IPs),
 		"DMARCName":    dnscheck.DMARCRecordName(d.Name),
 		"DMARCExample":      dnscheck.DMARCExample(reportEmail),
 		"DMARCSource":       dmarcSource,
@@ -159,8 +161,8 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 		// Client connection settings (the same for every domain on this
 		// instance): the hostname clients connect to, and whether the optional
 		// submission listener is enabled in this deployment.
-		"Hostname":          s.cfg.Hostname,
-		"SubmissionEnabled": s.cfg.SubmissionEnabled,
+		"Hostname":          h.cfg.Hostname,
+		"SubmissionEnabled": h.cfg.SubmissionEnabled,
 		"Apps":              appViews,
 		"Error":             view.FormErr,
 		"FormLogin":         view.FormLogin,
@@ -172,7 +174,7 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 		"List":              store.AddressModeList,
 		"RateLimitErr":      view.RateLimitErr,
 		"ExportErr":         view.ExportErr,
-		"MinPwLen":          minSecretFilePasswordLen,
+		"MinPwLen":          validate.MinSecretFilePasswordLen,
 		"DomainHasRL":       domainRLok && domainRL.Active(),
 		"DomainRLIPs":       strings.Join(domainRL.AllowedIPs, "\n"),
 		"DomainRLMax":       intOrBlank(domainRL.MaxMessages),
@@ -186,9 +188,9 @@ func (s *Server) renderDomainDetail(w http.ResponseWriter, r *http.Request, stat
 // and no extra environment variable is needed. That server result is returned
 // alongside, because the page's suggested SPF record is built from the same
 // addresses. force bypasses the cache, for the Re-check button.
-func (s *Server) domainDNS(d store.Domain, record domain.DKIMRecord, profileEmail string, force bool) (dnscheck.Domain, dnscheck.Server) {
-	srv := s.dns.Server(s.cfg.Hostname, false)
-	return s.dns.Domain(dnscheck.Query{
+func (h *Handlers) domainDNS(d store.Domain, record domain.DKIMRecord, profileEmail string, force bool) (dnscheck.Domain, dnscheck.Server) {
+	srv := h.dns.Server(h.cfg.Hostname, false)
+	return h.dns.Domain(dnscheck.Query{
 		Name:             d.Name,
 		Selector:         d.DKIMSelector,
 		ExpectedDKIM:     record.Value,
@@ -198,26 +200,26 @@ func (s *Server) domainDNS(d store.Domain, record domain.DKIMRecord, profileEmai
 	}, force), srv
 }
 
-// handleDomainDNSRecheck re-runs the domain's DNS checks ignoring the cache and
+// HandleDomainDNSRecheck re-runs the domain's DNS checks ignoring the cache and
 // returns to its page, which then renders the fresh result.
-func (s *Server) handleDomainDNSRecheck(w http.ResponseWriter, r *http.Request) {
-	d, ok := s.lookupDomain(w, r)
+func (h *Handlers) HandleDomainDNSRecheck(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
 	if !ok {
 		return
 	}
-	record, err := s.domains.DKIMRecord(d)
+	record, err := h.domains.DKIMRecord(d)
 	if err != nil {
 		logf("panel: domain %d: dkim record: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
-	admin, err := s.store.GetAdmin()
+	admin, err := h.store.GetAdmin()
 	if err != nil {
 		logf("panel: domain %d: get admin: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
-	s.domainDNS(d, record, admin.DMARCReportEmail, true)
+	h.domainDNS(d, record, admin.DMARCReportEmail, true)
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?rechecked=1", d.ID), http.StatusSeeOther)
 }
 
@@ -260,17 +262,17 @@ func detailFlash(r *http.Request) string {
 	}
 }
 
-// handleAddApplication creates an application on a domain and renders the page
+// HandleAddApplication creates an application on a domain and renders the page
 // back with the generated password shown once (product.md, security.md). Because the
 // password cannot be recovered later, this deliberately renders inline rather
 // than redirecting.
-func (s *Server) handleAddApplication(w http.ResponseWriter, r *http.Request) {
-	d, ok := s.lookupDomain(w, r)
+func (h *Handlers) HandleAddApplication(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
 	if !ok {
 		return
 	}
 	if err := r.ParseForm(); err != nil {
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d,
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d,
 			detailView{FormErr: "Invalid form submission.", FormMode: store.AddressModeWildcard})
 		return
 	}
@@ -284,25 +286,25 @@ func (s *Server) handleAddApplication(w http.ResponseWriter, r *http.Request) {
 		FormAddrs: r.PostFormValue("addresses"),
 	}
 
-	a, password, err := s.apps.Create(d.ID, login, mode, addrs)
+	a, password, err := h.apps.Create(d.ID, login, mode, addrs)
 	if err != nil {
 		repopulate.FormErr = applicationErrorMessage(err)
 		status := http.StatusBadRequest
 		if errors.Is(err, store.ErrLoginExists) {
 			status = http.StatusConflict
 		}
-		s.renderDomainDetail(w, r, status, d, repopulate)
+		h.renderDomainDetail(w, r, status, d, repopulate)
 		return
 	}
-	s.renderDomainDetail(w, r, http.StatusCreated, d, detailView{
+	h.renderDomainDetail(w, r, http.StatusCreated, d, detailView{
 		FormMode: store.AddressModeWildcard,
 		NewCred:  &newCred{Login: a.Login, Password: password},
 	})
 }
 
-// handleUpdateAppMode switches an application's address mode / list (product.md).
-func (s *Server) handleUpdateAppMode(w http.ResponseWriter, r *http.Request) {
-	a, ok := s.lookupApplication(w, r)
+// HandleUpdateAppMode switches an application's address mode / list (product.md).
+func (h *Handlers) HandleUpdateAppMode(w http.ResponseWriter, r *http.Request) {
+	a, ok := h.lookupApplication(w, r)
 	if !ok {
 		return
 	}
@@ -313,13 +315,13 @@ func (s *Server) handleUpdateAppMode(w http.ResponseWriter, r *http.Request) {
 	mode := r.PostFormValue("mode")
 	addrs := splitAddresses(r.PostFormValue("addresses"))
 
-	if err := s.apps.UpdateMode(a.ID, mode, addrs); err != nil {
-		d, derr := s.domains.Get(a.DomainID)
+	if err := h.apps.UpdateMode(a.ID, mode, addrs); err != nil {
+		d, derr := h.domains.Get(a.DomainID)
 		if derr != nil {
 			http.Error(w, "internal error", http.StatusInternalServerError)
 			return
 		}
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
 			FormErr:  fmt.Sprintf("Could not update %s: %s", a.Login, applicationErrorMessage(err)),
 			FormMode: store.AddressModeWildcard,
 		})
@@ -328,38 +330,38 @@ func (s *Server) handleUpdateAppMode(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?modeupdated=1", a.DomainID), http.StatusSeeOther)
 }
 
-// handleRegenPassword issues a new password for an application and shows it once
+// HandleRegenPassword issues a new password for an application and shows it once
 // (product.md, security.md). Rendered inline, like creation, so the password is visible.
-func (s *Server) handleRegenPassword(w http.ResponseWriter, r *http.Request) {
-	a, ok := s.lookupApplication(w, r)
+func (h *Handlers) HandleRegenPassword(w http.ResponseWriter, r *http.Request) {
+	a, ok := h.lookupApplication(w, r)
 	if !ok {
 		return
 	}
-	d, err := s.domains.Get(a.DomainID)
+	d, err := h.domains.Get(a.DomainID)
 	if err != nil {
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
-	password, err := s.apps.RegeneratePassword(a.ID)
+	password, err := h.apps.RegeneratePassword(a.ID)
 	if err != nil {
 		logf("panel: regenerate password for application %d: %v", a.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
-	s.renderDomainDetail(w, r, http.StatusOK, d, detailView{
+	h.renderDomainDetail(w, r, http.StatusOK, d, detailView{
 		FormMode: store.AddressModeWildcard,
 		NewCred:  &newCred{Login: a.Login, Password: password},
 	})
 }
 
-// handleDeleteApplication removes an application and returns to its domain page
+// HandleDeleteApplication removes an application and returns to its domain page
 // (product.md).
-func (s *Server) handleDeleteApplication(w http.ResponseWriter, r *http.Request) {
-	a, ok := s.lookupApplication(w, r)
+func (h *Handlers) HandleDeleteApplication(w http.ResponseWriter, r *http.Request) {
+	a, ok := h.lookupApplication(w, r)
 	if !ok {
 		return
 	}
-	if err := s.apps.Delete(a.ID); err != nil {
+	if err := h.apps.Delete(a.ID); err != nil {
 		logf("panel: delete application %d: %v", a.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
@@ -369,13 +371,13 @@ func (s *Server) handleDeleteApplication(w http.ResponseWriter, r *http.Request)
 
 // lookupApplication resolves the {aid} path value to an application, writing a
 // 404 for a bad id or missing application.
-func (s *Server) lookupApplication(w http.ResponseWriter, r *http.Request) (store.Application, bool) {
+func (h *Handlers) lookupApplication(w http.ResponseWriter, r *http.Request) (store.Application, bool) {
 	id, err := strconv.ParseInt(r.PathValue("aid"), 10, 64)
 	if err != nil || id <= 0 {
 		http.NotFound(w, r)
 		return store.Application{}, false
 	}
-	a, err := s.apps.Get(id)
+	a, err := h.apps.Get(id)
 	if err != nil {
 		if errors.Is(err, store.ErrApplicationNotFound) {
 			http.NotFound(w, r)

internal/web/handlers/handlers_backup.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"bytes"
@@ -13,6 +13,8 @@ import (
 	"github.com/mixeme/selfpost/internal/domain"
 	"github.com/mixeme/selfpost/internal/secretfile"
 	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
+	"github.com/mixeme/selfpost/internal/web/validate"
 )
 
 // maxImportBytes caps a domain-import upload. A domain export is a small JSON
@@ -22,35 +24,35 @@ import (
 // covers both forms.
 const maxImportBytes = 1 << 20 // 1 MiB
 
-// handleBackupPage renders the backup/migration screen: the full-server backup
+// HandleBackupPage renders the backup/migration screen: the full-server backup
 // and the domain import are separate actions with different risk, so each gets
 // its own card here rather than sharing a block on the domain list.
-func (s *Server) handleBackupPage(w http.ResponseWriter, r *http.Request) {
-	s.renderBackupPage(w, r, http.StatusOK, "")
+func (h *Handlers) HandleBackupPage(w http.ResponseWriter, r *http.Request) {
+	h.renderBackupPage(w, r, http.StatusOK, "")
 }
 
 // renderBackupPage draws the page; importErr surfaces a failed domain import
 // (architecture.md § Persistence) next to the form that produced it.
-func (s *Server) renderBackupPage(w http.ResponseWriter, r *http.Request, status int, importErr string) {
-	s.renderBackupPageWith(w, r, status, importErr, "")
+func (h *Handlers) renderBackupPage(w http.ResponseWriter, r *http.Request, status int, importErr string) {
+	h.renderBackupPageWith(w, r, status, importErr, "")
 }
 
 // renderBackupPageWith is renderBackupPage with the second of the page's two
 // error slots: backupErr belongs to the full-backup card (a rejected encryption
 // password), importErr to the import card, so neither message appears under the
 // wrong form.
-func (s *Server) renderBackupPageWith(w http.ResponseWriter, r *http.Request, status int, importErr, backupErr string) {
-	s.render(w, status, "backup", map[string]any{
+func (h *Handlers) renderBackupPageWith(w http.ResponseWriter, r *http.Request, status int, importErr, backupErr string) {
+	h.view.Render(w, status, "backup", map[string]any{
 		"Title":     "SelfPost — backup",
-		"User":      currentUser(r),
+		"User":      auth.CurrentUser(r),
 		"Active":    "backup",
 		"ImportErr": importErr,
 		"BackupErr": backupErr,
-		"MinPwLen":  minSecretFilePasswordLen,
+		"MinPwLen":  validate.MinSecretFilePasswordLen,
 	})
 }
 
-// handleBackup streams a full-server backup as a download (architecture.md §
+// HandleBackup streams a full-server backup as a download (architecture.md §
 // Persistence). It is an authenticated admin action (this handler sits behind
 // the auth middleware). The archive carries DKIM private keys, the admin
 // password hash and SASL credentials, so it is served with no-store and as an
@@ -58,10 +60,10 @@ func (s *Server) renderBackupPageWith(w http.ResponseWriter, r *http.Request, st
 // "encrypt with a password", the archive is wrapped in a .spbk envelope on the
 // way out, so the file that lands on their disk — wherever it is copied
 // afterwards — is useless without the password.
-func (s *Server) handleBackup(w http.ResponseWriter, r *http.Request) {
+func (h *Handlers) HandleBackup(w http.ResponseWriter, r *http.Request) {
 	password, pwErr := secretFilePassword(r)
 	if pwErr != "" {
-		s.renderBackupPageWith(w, r, http.StatusBadRequest, "", pwErr)
+		h.renderBackupPageWith(w, r, http.StatusBadRequest, "", pwErr)
 		return
 	}
 
@@ -99,9 +101,9 @@ func (s *Server) handleBackup(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := backup.Create(sink, backup.Params{
-		DataDir: s.cfg.DataDir,
-		DBPath:  s.cfg.DBPath,
-		Version: s.cfg.Version,
+		DataDir: h.cfg.DataDir,
+		DBPath:  h.cfg.DBPath,
+		Version: h.cfg.Version,
 	}); err != nil {
 		logf("panel: full backup failed: %v", err)
 		return
@@ -113,26 +115,26 @@ func (s *Server) handleBackup(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-// handleExportDomain streams a single-domain export as a secret download
+// HandleExportDomain streams a single-domain export as a secret download
 // (architecture.md § Persistence). Like the full backup it is POST-only (state
 // is not changed, but the response contains the domain's DKIM private key and
 // application passwords, so it must not be prefetchable or cached). Like the
 // full backup it can be encrypted with a password, in which case the download
 // is a .spde envelope instead of plain JSON.
-func (s *Server) handleExportDomain(w http.ResponseWriter, r *http.Request) {
-	d, ok := s.lookupDomain(w, r)
+func (h *Handlers) HandleExportDomain(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
 	if !ok {
 		return
 	}
 	password, pwErr := secretFilePassword(r)
 	if pwErr != "" {
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
 			FormMode:  store.AddressModeWildcard,
 			ExportErr: pwErr,
 		})
 		return
 	}
-	exp, err := s.domains.Export(d.ID)
+	exp, err := h.domains.Export(d.ID)
 	if err != nil {
 		logf("panel: export domain %d: %v", d.ID, err)
 		http.Error(w, "export failed", http.StatusInternalServerError)
@@ -174,22 +176,22 @@ func (s *Server) handleExportDomain(w http.ResponseWriter, r *http.Request) {
 	_, _ = w.Write(body)
 }
 
-// handleImportDomain accepts an uploaded domain-export file and re-creates the
+// HandleImportDomain accepts an uploaded domain-export file and re-creates the
 // domain on this instance (architecture.md § Persistence). The domain name is
 // normalised and validated here (security.md); the domain service validates
 // the selector, each login and address, and the DKIM key before writing
 // anything. On success it redirects to the new domain's page; on failure it
 // re-renders the backup page, where the import form lives, with a friendly
 // message.
-func (s *Server) handleImportDomain(w http.ResponseWriter, r *http.Request) {
+func (h *Handlers) HandleImportDomain(w http.ResponseWriter, r *http.Request) {
 	r.Body = http.MaxBytesReader(w, r.Body, maxImportBytes)
 	if err := r.ParseMultipartForm(maxImportBytes); err != nil {
-		s.renderBackupPage(w, r, http.StatusBadRequest, "Could not read the uploaded file (too large or not a valid upload).")
+		h.renderBackupPage(w, r, http.StatusBadRequest, "Could not read the uploaded file (too large or not a valid upload).")
 		return
 	}
 	file, _, err := r.FormFile("file")
 	if err != nil {
-		s.renderBackupPage(w, r, http.StatusBadRequest, "Choose a domain export file to import.")
+		h.renderBackupPage(w, r, http.StatusBadRequest, "Choose a domain export file to import.")
 		return
 	}
 	defer file.Close()
@@ -201,7 +203,7 @@ func (s *Server) handleImportDomain(w http.ResponseWriter, r *http.Request) {
 	head := make([]byte, secretfile.MagicLen)
 	n, err := io.ReadFull(file, head)
 	if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrUnexpectedEOF) {
-		s.renderBackupPage(w, r, http.StatusBadRequest, "Could not read the uploaded file.")
+		h.renderBackupPage(w, r, http.StatusBadRequest, "Could not read the uploaded file.")
 		return
 	}
 	source := io.MultiReader(bytes.NewReader(head[:n]), file)
@@ -209,16 +211,16 @@ func (s *Server) handleImportDomain(w http.ResponseWriter, r *http.Request) {
 
 	if secretfile.HasMagic(head[:n]) {
 		if password == "" {
-			s.renderBackupPage(w, r, http.StatusBadRequest, "That file is encrypted — enter the password it was exported with.")
+			h.renderBackupPage(w, r, http.StatusBadRequest, "That file is encrypted — enter the password it was exported with.")
 			return
 		}
 		env, err := secretfile.NewReader(source, password)
 		if err != nil {
-			s.renderBackupPage(w, r, http.StatusBadRequest, decryptErrorMessage(err))
+			h.renderBackupPage(w, r, http.StatusBadRequest, decryptErrorMessage(err))
 			return
 		}
 		if env.Type() != secretfile.TypeDomainExport {
-			s.renderBackupPage(w, r, http.StatusBadRequest, "That file is an encrypted "+env.Type().String()+", not a domain export.")
+			h.renderBackupPage(w, r, http.StatusBadRequest, "That file is an encrypted "+env.Type().String()+", not a domain export.")
 			return
 		}
 		// Read the whole plaintext first: authentication of the last chunk is
@@ -226,12 +228,12 @@ func (s *Server) handleImportDomain(w http.ResponseWriter, r *http.Request) {
 		// accept a truncated document before ever reaching it.
 		plain, err := io.ReadAll(env)
 		if err != nil {
-			s.renderBackupPage(w, r, http.StatusBadRequest, decryptErrorMessage(err))
+			h.renderBackupPage(w, r, http.StatusBadRequest, decryptErrorMessage(err))
 			return
 		}
 		source = bytes.NewReader(plain)
 	} else if password != "" {
-		s.renderBackupPage(w, r, http.StatusBadRequest, "That file is not encrypted — leave the password empty.")
+		h.renderBackupPage(w, r, http.StatusBadRequest, "That file is not encrypted — leave the password empty.")
 		return
 	}
 
@@ -239,23 +241,23 @@ func (s *Server) handleImportDomain(w http.ResponseWriter, r *http.Request) {
 	dec := json.NewDecoder(source)
 	dec.DisallowUnknownFields()
 	if err := dec.Decode(&exp); err != nil {
-		s.renderBackupPage(w, r, http.StatusBadRequest, "That file is not a valid SelfPost domain export.")
+		h.renderBackupPage(w, r, http.StatusBadRequest, "That file is not a valid SelfPost domain export.")
 		return
 	}
 
 	// Normalise and validate the domain name before it reaches the service, the
 	// same gate the add-domain form uses (security.md).
-	exp.Domain = normalizeDomain(exp.Domain)
-	if err := validateDomain(exp.Domain); err != nil {
-		s.renderBackupPage(w, r, http.StatusBadRequest, "Invalid domain in export file: "+err.Error())
+	exp.Domain = validate.NormalizeDomain(exp.Domain)
+	if err := validate.Domain(exp.Domain); err != nil {
+		h.renderBackupPage(w, r, http.StatusBadRequest, "Invalid domain in export file: "+err.Error())
 		return
 	}
 
-	d, err := s.domains.Import(exp)
+	d, err := h.domains.Import(exp)
 	if err != nil {
 		logf("panel: import domain %q: %v", exp.Domain, err)
 		status, msg := importErrorMessage(err)
-		s.renderBackupPage(w, r, status, msg)
+		h.renderBackupPage(w, r, status, msg)
 		return
 	}
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?imported=1", d.ID), http.StatusSeeOther)
@@ -276,8 +278,8 @@ func secretFilePassword(r *http.Request) (password, errMsg string) {
 		return "", ""
 	}
 	password = r.PostFormValue("password")
-	if len([]rune(password)) < minSecretFilePasswordLen {
-		return "", fmt.Sprintf("The encryption password must be at least %d characters.", minSecretFilePasswordLen)
+	if len([]rune(password)) < validate.MinSecretFilePasswordLen {
+		return "", fmt.Sprintf("The encryption password must be at least %d characters.", validate.MinSecretFilePasswordLen)
 	}
 	if password != r.PostFormValue("password_confirm") {
 		return "", "The two passwords do not match."

internal/web/handlers/handlers_backup_test.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"errors"
@@ -10,6 +10,7 @@ import (
 	"testing"
 
 	"github.com/mixeme/selfpost/internal/secretfile"
+	"github.com/mixeme/selfpost/internal/web/validate"
 )
 
 // postForm builds the kind of request the backup and export forms submit.
@@ -24,8 +25,8 @@ func postForm(values url.Values) *http.Request {
 // the archive is sealed — and leaving the box unticked has to keep producing
 // the plain archive earlier versions produced.
 func TestSecretFilePassword(t *testing.T) {
-	long := strings.Repeat("x", minSecretFilePasswordLen)
-	short := strings.Repeat("x", minSecretFilePasswordLen-1)
+	long := strings.Repeat("x", validate.MinSecretFilePasswordLen)
+	short := strings.Repeat("x", validate.MinSecretFilePasswordLen-1)
 
 	tests := []struct {
 		name     string
@@ -104,13 +105,9 @@ func TestDecryptErrorMessage(t *testing.T) {
 // forgets to include the partial (or the data it needs) loses the option
 // silently, since the plain download still works.
 func TestBackupPageOffersEncryption(t *testing.T) {
-	tmpl, err := loadTemplates()
-	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
-	}
-	s := &Server{tmpl: tmpl, cfg: Config{Version: "test"}}
+	h := &Handlers{view: mustView(t), cfg: Config{Version: "test"}}
 	rec := httptest.NewRecorder()
-	s.renderBackupPageWith(rec, httptest.NewRequest(http.MethodGet, "/backup", nil),
+	h.renderBackupPageWith(rec, httptest.NewRequest(http.MethodGet, "/backup", nil),
 		http.StatusOK, "", "The two passwords do not match.")
 
 	body := rec.Body.String()
@@ -118,7 +115,7 @@ func TestBackupPageOffersEncryption(t *testing.T) {
 		`name="encrypt"`, `name="password"`, `name="password_confirm"`,
 		`name="import_password"`, "data-encrypt-toggle", "data-encrypt-fields",
 		"data-import-password-fields",
-		fmt.Sprintf("at least %d characters", minSecretFilePasswordLen),
+		fmt.Sprintf("at least %d characters", validate.MinSecretFilePasswordLen),
 		"The two passwords do not match.",
 	} {
 		if !strings.Contains(body, want) {

internal/web/handlers/handlers_dmarc.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"database/sql"
@@ -6,21 +6,22 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/mixeme/selfpost/internal/web/validate"
 )
 
-// handleDomainDMARC saves per-domain DMARC rua= settings.
-func (s *Server) handleDomainDMARC(w http.ResponseWriter, r *http.Request) {
+// HandleDomainDMARC saves per-domain DMARC rua= settings.
+func (h *Handlers) HandleDomainDMARC(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
 		w.Header().Set("Allow", "POST")
 		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
 		return
 	}
-	d, ok := s.lookupDomain(w, r)
+	d, ok := h.lookupDomain(w, r)
 	if !ok {
 		return
 	}
 	if err := r.ParseForm(); err != nil {
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: "Invalid form submission."})
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: "Invalid form submission."})
 		return
 	}
 
@@ -32,25 +33,25 @@ func (s *Server) handleDomainDMARC(w http.ResponseWriter, r *http.Request) {
 		rua = sql.NullString{Valid: true, String: ""}
 	case "custom":
 		email := strings.TrimSpace(r.PostFormValue("dmarc_rua_email"))
-		if err := validateEmail(email); err != nil {
-			s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: err.Error()})
+		if err := validate.Email(email); err != nil {
+			h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: err.Error()})
 			return
 		}
 		if email == "" {
-			s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: "Enter a custom report address or choose another mode."})
+			h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: "Enter a custom report address or choose another mode."})
 			return
 		}
 		rua = sql.NullString{Valid: true, String: email}
 	default:
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: "Choose how aggregate reports are addressed for this domain."})
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{FormErr: "Choose how aggregate reports are addressed for this domain."})
 		return
 	}
 
-	if err := s.store.UpdateDomainDMARCRua(d.ID, rua); err != nil {
+	if err := h.store.UpdateDomainDMARCRua(d.ID, rua); err != nil {
 		logf("panel: domain %d: save dmarc rua: %v", d.ID, err)
-		s.renderDomainDetail(w, r, http.StatusInternalServerError, d, detailView{FormErr: "Could not save DMARC settings. Please check the logs and try again."})
+		h.renderDomainDetail(w, r, http.StatusInternalServerError, d, detailView{FormErr: "Could not save DMARC settings. Please check the logs and try again."})
 		return
 	}
-	s.dns.Forget(d.Name)
+	h.dns.Forget(d.Name)
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?dmarc=1", d.ID), http.StatusSeeOther)
 }

internal/web/handlers/handlers_domains.go

@@ -0,0 +1,186 @@
+package handlers
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"strconv"
+	"sync"
+
+	"github.com/mixeme/selfpost/internal/health"
+	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
+	"github.com/mixeme/selfpost/internal/web/validate"
+)
+
+// domainRow is one line of the domain list: the stored domain plus the rolled-up
+// verdict of its published DNS records, so the operator sees which domains still
+// need a record published without opening each one.
+type domainRow struct {
+	store.Domain
+	DNS health.Status
+}
+
+// HandleDashboard is the authenticated landing page: the list of sending
+// domains with their DKIM/selector and application counts, plus the add-domain
+// form (product.md).
+func (h *Handlers) HandleDashboard(w http.ResponseWriter, r *http.Request) {
+	h.renderDashboard(w, r, http.StatusOK, "", "")
+}
+
+func (h *Handlers) renderDashboard(w http.ResponseWriter, r *http.Request, status int, formErr, formName string) {
+	domains, err := h.domains.List()
+	if err != nil {
+		logf("panel: dashboard: list domains: %v", err)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	h.view.Render(w, status, "dashboard", map[string]any{
+		"Title":    "SelfPost",
+		"User":     auth.CurrentUser(r),
+		"Active":   "domains",
+		"Domains":  h.domainRows(domains),
+		"Error":    formErr,
+		"FormName": formName,
+		"Flash":    dashboardFlash(r),
+	})
+}
+
+func (h *Handlers) domainRows(domains []store.Domain) []domainRow {
+	profileEmail := ""
+	if admin, err := h.store.GetAdmin(); err == nil {
+		profileEmail = admin.DMARCReportEmail
+	}
+	rows := make([]domainRow, len(domains))
+	var wg sync.WaitGroup
+	for i, d := range domains {
+		rows[i] = domainRow{Domain: d, DNS: health.StatusUnknown}
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			record, err := h.domains.DKIMRecord(d)
+			if err != nil {
+				logf("panel: dashboard: domain %d: dkim record: %v", d.ID, err)
+				return
+			}
+			dns, _ := h.domainDNS(d, record, profileEmail, false)
+			rows[i].DNS = dns.Overall
+		}()
+	}
+	wg.Wait()
+	return rows
+}
+
+func dashboardFlash(r *http.Request) string {
+	if r.URL.Query().Get("deleted") != "" {
+		return "Domain deleted."
+	}
+	return ""
+}
+
+// HandleAddDomain validates the submitted name, creates the domain (DKIM key +
+// OpenDKIM reload), and redirects to the domain's page so the DNS record to
+// publish is shown (product.md).
+func (h *Handlers) HandleAddDomain(w http.ResponseWriter, r *http.Request) {
+	if err := r.ParseForm(); err != nil {
+		h.renderDashboard(w, r, http.StatusBadRequest, "Invalid form submission.", "")
+		return
+	}
+	raw := r.PostFormValue("name")
+	name := validate.NormalizeDomain(raw)
+	if err := validate.Domain(name); err != nil {
+		h.renderDashboard(w, r, http.StatusBadRequest, err.Error(), raw)
+		return
+	}
+
+	d, err := h.domains.Add(name)
+	if err != nil {
+		if errors.Is(err, store.ErrDomainExists) {
+			h.renderDashboard(w, r, http.StatusConflict, "That domain is already configured.", raw)
+			return
+		}
+		logf("panel: add domain %q: %v", name, err)
+		h.renderDashboard(w, r, http.StatusInternalServerError,
+			"Could not add the domain. Please check the logs and try again.", raw)
+		return
+	}
+	http.Redirect(w, r, fmt.Sprintf("/domains/%d", d.ID), http.StatusSeeOther)
+}
+
+// HandleDeleteConfirm shows the cascade warning before a domain is removed.
+func (h *Handlers) HandleDeleteConfirm(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
+	if !ok {
+		return
+	}
+	h.view.Render(w, http.StatusOK, "domain_delete", map[string]any{
+		"Title":  "SelfPost — delete " + d.Name,
+		"User":   auth.CurrentUser(r),
+		"Active": "domains",
+		"Domain": d,
+	})
+}
+
+// HandleDeleteDomain performs the deletion and returns to the domain list.
+func (h *Handlers) HandleDeleteDomain(w http.ResponseWriter, r *http.Request) {
+	id, ok := parseDomainID(w, r)
+	if !ok {
+		return
+	}
+	if d, err := h.domains.Get(id); err == nil {
+		defer h.dns.Forget(d.Name)
+	}
+	if err := h.domains.Delete(id); err != nil {
+		if errors.Is(err, store.ErrDomainNotFound) {
+			http.NotFound(w, r)
+			return
+		}
+		logf("panel: delete domain %d: %v", id, err)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	http.Redirect(w, r, "/domains?deleted=1", http.StatusSeeOther)
+}
+
+// HandleReload re-applies both the OpenDKIM configuration and the Postfix
+// sender map on demand (architecture.md § Panel HTTP surface).
+func (h *Handlers) HandleReload(w http.ResponseWriter, r *http.Request) {
+	if err := h.domains.Resync(); err != nil {
+		logf("panel: manual reload (opendkim): %v", err)
+		http.Error(w, "reload failed", http.StatusInternalServerError)
+		return
+	}
+	if err := h.apps.Resync(); err != nil {
+		logf("panel: manual reload (postfix): %v", err)
+		http.Error(w, "reload failed", http.StatusInternalServerError)
+		return
+	}
+	http.Redirect(w, r, "/status?reloaded=1", http.StatusSeeOther)
+}
+
+func (h *Handlers) lookupDomain(w http.ResponseWriter, r *http.Request) (store.Domain, bool) {
+	id, ok := parseDomainID(w, r)
+	if !ok {
+		return store.Domain{}, false
+	}
+	d, err := h.domains.Get(id)
+	if err != nil {
+		if errors.Is(err, store.ErrDomainNotFound) {
+			http.NotFound(w, r)
+			return store.Domain{}, false
+		}
+		logf("panel: get domain %d: %v", id, err)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return store.Domain{}, false
+	}
+	return d, true
+}
+
+func parseDomainID(w http.ResponseWriter, r *http.Request) (int64, bool) {
+	id, err := strconv.ParseInt(r.PathValue("id"), 10, 64)
+	if err != nil || id <= 0 {
+		http.NotFound(w, r)
+		return 0, false
+	}
+	return id, true
+}

internal/web/handlers/handlers_monitor.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"errors"
@@ -12,6 +12,7 @@ import (
 	"github.com/mixeme/selfpost/internal/mailhdr"
 	"github.com/mixeme/selfpost/internal/postfix"
 	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
 )
 
 // sendLogPageSize bounds each send-log page (product.md's monitoring screens
@@ -24,38 +25,38 @@ const (
 	deliveryLogLines = 200
 )
 
-// handleDeliveries renders the Deliveries page over the send log: server-side
+// HandleDeliveries renders the Deliveries page over the send log: server-side
 // filters by domain/application and pagination (architecture.md §
 // Persistence). The row table itself is the "deliveries_rows" fragment, shared
-// verbatim with handleDeliveriesRows so the initial page and its HTMX-polled
+// verbatim with HandleDeliveriesRows so the initial page and its HTMX-polled
 // refreshes never diverge.
-func (s *Server) handleDeliveries(w http.ResponseWriter, r *http.Request) {
-	data, err := s.sendLogData(r)
+func (h *Handlers) HandleDeliveries(w http.ResponseWriter, r *http.Request) {
+	data, err := h.sendLogData(r)
 	if err != nil {
 		logf("panel: send log: %v", err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
 	data["Title"] = "SelfPost — deliveries"
-	data["User"] = currentUser(r)
+	data["User"] = auth.CurrentUser(r)
 	data["Active"] = "deliveries"
-	s.render(w, http.StatusOK, "deliveries", data)
+	h.view.Render(w, http.StatusOK, "deliveries", data)
 }
 
-// handleDeliveriesRows serves the HTMX polling fragment for the delivery table
+// HandleDeliveriesRows serves the HTMX polling fragment for the delivery table
 // (architecture.md § Panel HTTP surface: fragment endpoints return HTML, not
 // JSON).
-func (s *Server) handleDeliveriesRows(w http.ResponseWriter, r *http.Request) {
-	data, err := s.sendLogData(r)
+func (h *Handlers) HandleDeliveriesRows(w http.ResponseWriter, r *http.Request) {
+	data, err := h.sendLogData(r)
 	if err != nil {
 		logf("panel: send log rows: %v", err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
-	s.renderFragment(w, http.StatusOK, "deliveries_rows", data)
+	h.view.RenderFragment(w, http.StatusOK, "deliveries_rows", data)
 }
 
-// handleDelivery renders one send-log row in full. The log itself carries only
+// HandleDelivery renders one send-log row in full. The log itself carries only
 // what identifies a message at a glance — when, who to and from, what about,
 // how it ended — and every remaining field (domain, application, queue id, when
 // the status was last reported) lives here, one page per row, so widening the
@@ -67,13 +68,13 @@ func (s *Server) handleDeliveriesRows(w http.ResponseWriter, r *http.Request) {
 // its history side by side, and the mail.log lines for its queue id under both.
 // The queue id used to be printed here as something to go and search the system
 // log for by hand; the search is done for the operator instead.
-func (s *Server) handleDelivery(w http.ResponseWriter, r *http.Request) {
+func (h *Handlers) HandleDelivery(w http.ResponseWriter, r *http.Request) {
 	id, err := strconv.ParseInt(r.PathValue("id"), 10, 64)
 	if err != nil || id <= 0 {
 		http.NotFound(w, r)
 		return
 	}
-	row, err := s.store.GetSendLog(id)
+	row, err := h.store.GetSendLog(id)
 	if err != nil {
 		// A row pruned on the retention window is gone, not broken.
 		if errors.Is(err, store.ErrSendLogNotFound) {
@@ -85,10 +86,10 @@ func (s *Server) handleDelivery(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	row.Subject = mailhdr.DecodeSubject(row.Subject)
-	logRows, logNote := s.deliveryLog(row)
-	s.render(w, http.StatusOK, "delivery", map[string]any{
+	logRows, logNote := h.deliveryLog(row)
+	h.view.Render(w, http.StatusOK, "delivery", map[string]any{
 		"Title":  "SelfPost — delivery",
-		"User":   currentUser(r),
+		"User":   auth.CurrentUser(r),
 		"Active": "deliveries",
 		"Row":    row,
 		// The status in the panel's own badge vocabulary, so the headline reads
@@ -223,11 +224,11 @@ type deliveryLogRow struct {
 // have aged out of the log — so none of them is an error on the page. Only a
 // log that cannot be read at all is reported as a fault, and that one is
 // logged for the operator as well.
-func (s *Server) deliveryLog(row store.SendLogRow) ([]deliveryLogRow, string) {
+func (h *Handlers) deliveryLog(row store.SendLogRow) ([]deliveryLogRow, string) {
 	if row.QueueID == "" {
 		return nil, "This message never reached the queue, so Postfix wrote no delivery lines for it."
 	}
-	lines, err := logtail.QueueLines(s.cfg.MailLogPath, row.QueueID, deliveryLogLines)
+	lines, err := logtail.QueueLines(h.cfg.MailLogPath, row.QueueID, deliveryLogLines)
 	if err != nil && !errors.Is(err, fs.ErrNotExist) {
 		logf("panel: delivery log %s: %v", row.QueueID, err)
 		return nil, "Could not read the mail log."
@@ -267,7 +268,7 @@ func deliveriesBackURL(r *http.Request) string {
 // sendLogData reads the domain/app filters and page number off the query
 // string, queries the store, and assembles everything the template needs
 // (filter dropdown options plus the current selection, rows, and pagination).
-func (s *Server) sendLogData(r *http.Request) (map[string]any, error) {
+func (h *Handlers) sendLogData(r *http.Request) (map[string]any, error) {
 	q := r.URL.Query()
 	filter := store.SendLogFilter{
 		Domain:   q.Get("domain"),
@@ -275,11 +276,11 @@ func (s *Server) sendLogData(r *http.Request) (map[string]any, error) {
 	}
 	page := parsePage(q.Get("p"))
 
-	total, err := s.store.CountSendLog(filter)
+	total, err := h.store.CountSendLog(filter)
 	if err != nil {
 		return nil, err
 	}
-	rows, err := s.store.QuerySendLog(filter, sendLogPageSize, (page-1)*sendLogPageSize)
+	rows, err := h.store.QuerySendLog(filter, sendLogPageSize, (page-1)*sendLogPageSize)
 	if err != nil {
 		return nil, err
 	}
@@ -289,7 +290,7 @@ func (s *Server) sendLogData(r *http.Request) (map[string]any, error) {
 	for i := range rows {
 		rows[i].Subject = mailhdr.DecodeSubject(rows[i].Subject)
 	}
-	domains, err := s.store.ListDomains()
+	domains, err := h.store.ListDomains()
 	if err != nil {
 		return nil, err
 	}
@@ -297,7 +298,7 @@ func (s *Server) sendLogData(r *http.Request) (map[string]any, error) {
 	for i, d := range domains {
 		domainNames[i] = d.Name
 	}
-	logins, err := s.store.ListApplicationLogins()
+	logins, err := h.store.ListApplicationLogins()
 	if err != nil {
 		return nil, err
 	}
@@ -331,23 +332,23 @@ func parsePage(v string) int {
 	return n
 }
 
-// handleMailQueue renders the Mail queue page (architecture.md § Panel HTTP
+// HandleMailQueue renders the Mail queue page (architecture.md § Panel HTTP
 // surface).
-func (s *Server) handleMailQueue(w http.ResponseWriter, r *http.Request) {
+func (h *Handlers) HandleMailQueue(w http.ResponseWriter, r *http.Request) {
 	out, errText := readQueue()
-	s.render(w, http.StatusOK, "mail_queue", map[string]any{
+	h.view.Render(w, http.StatusOK, "mail_queue", map[string]any{
 		"Title":  "SelfPost — mail queue",
-		"User":   currentUser(r),
+		"User":   auth.CurrentUser(r),
 		"Active": "mail_queue",
 		"Output": out,
 		"Error":  errText,
 	})
 }
 
-// handleMailQueueBody serves the HTMX polling fragment for the queue view.
-func (s *Server) handleMailQueueBody(w http.ResponseWriter, r *http.Request) {
+// HandleMailQueueBody serves the HTMX polling fragment for the queue view.
+func (h *Handlers) HandleMailQueueBody(w http.ResponseWriter, r *http.Request) {
 	out, errText := readQueue()
-	s.renderFragment(w, http.StatusOK, "mail_queue_body", map[string]any{
+	h.view.RenderFragment(w, http.StatusOK, "mail_queue_body", map[string]any{
 		"Output": out,
 		"Error":  errText,
 	})
@@ -365,30 +366,30 @@ func readQueue() (string, string) {
 	return out, ""
 }
 
-// handleSystemLog renders the System log page over mail.log (architecture.md §
+// HandleSystemLog renders the System log page over mail.log (architecture.md §
 // Panel HTTP surface).
-func (s *Server) handleSystemLog(w http.ResponseWriter, r *http.Request) {
-	lines, errText := s.readLogTail()
-	s.render(w, http.StatusOK, "system_log", map[string]any{
+func (h *Handlers) HandleSystemLog(w http.ResponseWriter, r *http.Request) {
+	lines, errText := h.readLogTail()
+	h.view.Render(w, http.StatusOK, "system_log", map[string]any{
 		"Title":  "SelfPost — system log",
-		"User":   currentUser(r),
+		"User":   auth.CurrentUser(r),
 		"Active": "system_log",
 		"Lines":  lines,
 		"Error":  errText,
 	})
 }
 
-// handleSystemLogBody serves the HTMX polling fragment for the log-tail view.
-func (s *Server) handleSystemLogBody(w http.ResponseWriter, r *http.Request) {
-	lines, errText := s.readLogTail()
-	s.renderFragment(w, http.StatusOK, "system_log_body", map[string]any{
+// HandleSystemLogBody serves the HTMX polling fragment for the log-tail view.
+func (h *Handlers) HandleSystemLogBody(w http.ResponseWriter, r *http.Request) {
+	lines, errText := h.readLogTail()
+	h.view.RenderFragment(w, http.StatusOK, "system_log_body", map[string]any{
 		"Lines": lines,
 		"Error": errText,
 	})
 }
 
-func (s *Server) readLogTail() ([]string, string) {
-	lines, err := logtail.TailLines(s.cfg.MailLogPath, logTailLines)
+func (h *Handlers) readLogTail() ([]string, string) {
+	lines, err := logtail.TailLines(h.cfg.MailLogPath, logTailLines)
 	if err != nil {
 		if errors.Is(err, fs.ErrNotExist) {
 			// Rotation renamed the file away; Postfix recreates it on reload
@@ -396,7 +397,7 @@ func (s *Server) readLogTail() ([]string, string) {
 			// than a failure worth alarming the operator about.
 			return nil, ""
 		}
-		logf("panel: tail %s: %v", s.cfg.MailLogPath, err)
+		logf("panel: tail %s: %v", h.cfg.MailLogPath, err)
 		return nil, "Could not read the mail log."
 	}
 	return lines, ""

internal/web/handlers/handlers_monitor_test.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"net/http"
@@ -16,9 +16,9 @@ import (
 // recreate it on reload (spec B.2); a missing file in that window is a normal,
 // transient gap, not an operator-facing failure.
 func TestReadLogTailMissingFileIsNotAnError(t *testing.T) {
-	s := &Server{cfg: Config{MailLogPath: filepath.Join(t.TempDir(), "mail.log")}}
+	h := &Handlers{cfg: Config{MailLogPath: filepath.Join(t.TempDir(), "mail.log")}}
 
-	lines, errText := s.readLogTail()
+	lines, errText := h.readLogTail()
 	if lines != nil {
 		t.Errorf("lines = %v, want nil", lines)
 	}
@@ -31,9 +31,9 @@ func TestReadLogTailMissingFileIsNotAnError(t *testing.T) {
 // when, from, to, subject and status, and links each row to the page carrying
 // the rest. A column added back here is one the table has no width for.
 func TestDeliveryLogShowsOnlyTheIdentifyingColumns(t *testing.T) {
-	s, row := serverWithDelivery(t)
+	h, row := serverWithDelivery(t)
 
-	out := getBody(t, s.handleDeliveries, "/deliveries")
+	out := getBody(t, h.HandleDeliveries, "/deliveries")
 	for _, want := range []string{
 		row.CreatedAt.Format("2006-01-02 15:04:05"),
 		"noreply@bs.example.ru", "public@example.ru",
@@ -56,11 +56,11 @@ func TestDeliveryLogShowsOnlyTheIdentifyingColumns(t *testing.T) {
 // decoded them, and those rows are still in the send log. Decoding on the way
 // out is what keeps them readable, so the encoding must not survive to the page.
 func TestDeliveryLogDecodesStoredEncodedSubjects(t *testing.T) {
-	s, _ := serverWithDelivery(t)
+	h, _ := serverWithDelivery(t)
 
 	for name, out := range map[string]string{
-		"log":  getBody(t, s.handleDeliveries, "/deliveries"),
-		"rows": getBody(t, s.handleDeliveriesRows, "/deliveries/rows"),
+		"log":  getBody(t, h.HandleDeliveries, "/deliveries"),
+		"rows": getBody(t, h.HandleDeliveriesRows, "/deliveries/rows"),
 	} {
 		if strings.Contains(out, "=?utf-8?Q?") {
 			t.Errorf("%s shows the subject's MIME encoding instead of its text:\n%s", name, out)
@@ -74,9 +74,9 @@ func TestDeliveryLogDecodesStoredEncodedSubjects(t *testing.T) {
 // Everything the log dropped has to be somewhere, and that somewhere is the
 // per-row page — including for a row still holding an encoded subject.
 func TestDeliveryPageShowsWhatTheLogOmits(t *testing.T) {
-	s, row := serverWithDelivery(t)
+	h, row := serverWithDelivery(t)
 
-	out := getBody(t, s.handleDelivery, "/deliveries/"+itoa(row.ID)+"?domain=bs.example.ru&p=2")
+	out := getBody(t, h.HandleDelivery, "/deliveries/"+itoa(row.ID)+"?domain=bs.example.ru&p=2")
 	for _, want := range []string{
 		"bs.example.ru", "Queuer3C", "4A1B2C3D", "Проверка",
 		"noreply@bs.example.ru", "public@example.ru", "sent",
@@ -95,9 +95,9 @@ func TestDeliveryPageShowsWhatTheLogOmits(t *testing.T) {
 // journal holds, stated as the steps they stand for, so a row is readable as
 // what happened to the message rather than as a list of fields.
 func TestDeliveryPageTellsTheMessagesHistory(t *testing.T) {
-	s, row := serverWithDelivery(t)
+	h, row := serverWithDelivery(t)
 
-	out := getBody(t, s.handleDelivery, "/deliveries/"+itoa(row.ID))
+	out := getBody(t, h.HandleDelivery, "/deliveries/"+itoa(row.ID))
 	for _, want := range []string{
 		"Accepted and queued", "Delivered",
 		row.CreatedAt.Format("2006-01-02 15:04:05"),
@@ -121,19 +121,19 @@ func TestDeliveryPageTellsTheMessagesHistory(t *testing.T) {
 // for is drawn as one that has not happened rather than dated with the moment
 // the row was written.
 func TestDeliveryPageMarksAQueuedMessageAsStillWaiting(t *testing.T) {
-	s, _ := serverWithDelivery(t)
-	if err := s.store.InsertQueued(store.SendLogEntry{
+	h, _ := serverWithDelivery(t)
+	if err := h.store.InsertQueued(store.SendLogEntry{
 		QueueID: "7F7F7F7F", Domain: "bs.example.ru", AppLogin: "Queuer3C",
 		From: "noreply@bs.example.ru", To: "waiting@example.ru", Subject: "Still going",
 	}); err != nil {
 		t.Fatalf("insert: %v", err)
 	}
-	rows, err := s.store.QuerySendLog(store.SendLogFilter{}, 1, 0)
+	rows, err := h.store.QuerySendLog(store.SendLogFilter{}, 1, 0)
 	if err != nil || len(rows) != 1 {
 		t.Fatalf("query: %v (%d rows)", err, len(rows))
 	}
 
-	out := getBody(t, s.handleDelivery, "/deliveries/"+itoa(rows[0].ID))
+	out := getBody(t, h.HandleDelivery, "/deliveries/"+itoa(rows[0].ID))
 	for _, want := range []string{"Waiting for a delivery report", "pending", "not yet"} {
 		if !strings.Contains(out, want) {
 			t.Errorf("delivery page does not mark the message as still waiting (%q):\n%s", want, out)
@@ -146,14 +146,14 @@ func TestDeliveryPageMarksAQueuedMessageAsStillWaiting(t *testing.T) {
 // lines — as a table of when and what, so the seconds between the connection
 // and the reply line up down one edge.
 func TestDeliveryPageShowsThisMessagesLogLines(t *testing.T) {
-	s, row := serverWithDelivery(t)
-	s.cfg.MailLogPath = writeMailLog(t,
+	h, row := serverWithDelivery(t)
+	h.cfg.MailLogPath = writeMailLog(t,
 		"2026-08-03T05:15:52.219218+00:00 host postfix/smtpd[20]: 4A1B2C3D: client=mail.example.com[203.0.113.4]",
 		"2026-08-03T05:15:52.300000+00:00 host postfix/qmgr[10]: 99999999: from=<other@example.ru>, size=500, nrcpt=1 (queue active)",
 		"2026-08-03T05:16:03.884210+00:00 host postfix/smtp[26]: 4A1B2C3D: to=<public@example.ru>, dsn=2.0.0, status=sent (250 OK)",
 	)
 
-	out := getBody(t, s.handleDelivery, "/deliveries/"+itoa(row.ID))
+	out := getBody(t, h.HandleDelivery, "/deliveries/"+itoa(row.ID))
 	for _, want := range []string{
 		"<th>Time</th>", "<th>Message</th>",
 		// The stamp is split off into its own cell, without the microseconds
@@ -174,10 +174,10 @@ func TestDeliveryPageShowsThisMessagesLogLines(t *testing.T) {
 // A line whose head is not a timestamp still has to show in full; the format is
 // the log's, not ours, and a line we cannot split is a line we must not drop.
 func TestDeliveryPageKeepsAnUnstampedLogLineWhole(t *testing.T) {
-	s, row := serverWithDelivery(t)
-	s.cfg.MailLogPath = writeMailLog(t, "host postfix/smtp[26]: 4A1B2C3D: to=<public@example.ru>, status=sent (250 OK)")
+	h, row := serverWithDelivery(t)
+	h.cfg.MailLogPath = writeMailLog(t, "host postfix/smtp[26]: 4A1B2C3D: to=<public@example.ru>, status=sent (250 OK)")
 
-	out := getBody(t, s.handleDelivery, "/deliveries/"+itoa(row.ID))
+	out := getBody(t, h.HandleDelivery, "/deliveries/"+itoa(row.ID))
 	if !strings.Contains(out, "host postfix/smtp[26]: 4A1B2C3D: to=&lt;public@example.ru&gt;, status=sent (250 OK)") {
 		t.Errorf("an unstamped log line did not survive the split into columns:\n%s", out)
 	}
@@ -186,10 +186,10 @@ func TestDeliveryPageKeepsAnUnstampedLogLineWhole(t *testing.T) {
 // Rows outlive mail.log, and a message the milter refused never reached the
 // queue at all. Neither is a fault, so neither may render as an error.
 func TestDeliveryPageExplainsAnEmptyDeliveryLog(t *testing.T) {
-	s, row := serverWithDelivery(t)
-	s.cfg.MailLogPath = filepath.Join(t.TempDir(), "mail.log") // never created
+	h, row := serverWithDelivery(t)
+	h.cfg.MailLogPath = filepath.Join(t.TempDir(), "mail.log") // never created
 
-	out := getBody(t, s.handleDelivery, "/deliveries/"+itoa(row.ID))
+	out := getBody(t, h.HandleDelivery, "/deliveries/"+itoa(row.ID))
 	if !strings.Contains(out, "rotated away") {
 		t.Errorf("delivery page does not explain the empty delivery log:\n%s", out)
 	}
@@ -201,13 +201,13 @@ func TestDeliveryPageExplainsAnEmptyDeliveryLog(t *testing.T) {
 // Send-log rows are pruned on the retention window, so a bookmarked delivery
 // that no longer exists is a 404, not a 500.
 func TestDeliveryPageNotFound(t *testing.T) {
-	s, _ := serverWithDelivery(t)
+	h, _ := serverWithDelivery(t)
 
 	for _, path := range []string{"/deliveries/999999", "/deliveries/abc", "/deliveries/0"} {
 		rec := httptest.NewRecorder()
 		req := httptest.NewRequest(http.MethodGet, path, nil)
 		req.SetPathValue("id", strings.TrimPrefix(path, "/deliveries/"))
-		s.handleDelivery(rec, req)
+		h.HandleDelivery(rec, req)
 		if rec.Code != http.StatusNotFound {
 			t.Errorf("GET %s = %d, want 404", path, rec.Code)
 		}
@@ -216,7 +216,7 @@ func TestDeliveryPageNotFound(t *testing.T) {
 
 // serverWithDelivery builds a panel over a store holding one delivery, written
 // the way the journal-milter wrote them before it decoded subjects itself.
-func serverWithDelivery(t *testing.T) (*Server, store.SendLogRow) {
+func serverWithDelivery(t *testing.T) (*Handlers, store.SendLogRow) {
 	t.Helper()
 	st, err := store.Open(filepath.Join(t.TempDir(), "test.db"))
 	if err != nil {
@@ -242,11 +242,7 @@ func serverWithDelivery(t *testing.T) (*Server, store.SendLogRow) {
 		t.Fatalf("query: %v (%d rows)", err, len(rows))
 	}
 
-	tmpl, err := loadTemplates()
-	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
-	}
-	return &Server{store: st, tmpl: tmpl, cfg: Config{Version: "test"}}, rows[0]
+	return &Handlers{store: st, view: mustView(t), cfg: Config{Version: "test"}}, rows[0]
 }
 
 // getBody runs one handler over a GET and returns the page it wrote, failing

internal/web/handlers/handlers_ratelimit.go

@@ -1,4 +1,4 @@
-package web
+package handlers
 
 import (
 	"fmt"
@@ -10,15 +10,8 @@ import (
 	"github.com/mixeme/selfpost/internal/store"
 )
 
-// defaultRateLimitWindowSeconds is the sliding-window length used when an
-// admin sets a message ceiling but leaves the window blank (guide § Rate
-// limiting, matching the level-1 default hour; guide § Environment variables:
-// RATE_LIMIT_WINDOW_SECONDS).
 const defaultRateLimitWindowSeconds = 3600
 
-// rateLimitInput is the validated result of a rate-limit form submission.
-// clear means "remove the differentiated limit" (guide § Rate limiting: an
-// empty IP binding leaves only level 1).
 type rateLimitInput struct {
 	clear         bool
 	ips           []string
@@ -26,10 +19,6 @@ type rateLimitInput struct {
 	windowSeconds int
 }
 
-// parseRateLimitForm validates a rate-limit submission on the server
-// (security.md). It returns clear=true when the admin removes the limit or
-// leaves the IP binding empty; otherwise it requires a positive ceiling and
-// window. The returned error's message is safe to show to the admin.
 func parseRateLimitForm(r *http.Request) (rateLimitInput, error) {
 	if err := r.ParseForm(); err != nil {
 		return rateLimitInput{}, fmt.Errorf("invalid form submission")
@@ -42,8 +31,6 @@ func parseRateLimitForm(r *http.Request) (rateLimitInput, error) {
 		return rateLimitInput{}, err
 	}
 	if len(ips) == 0 {
-		// No IP binding: the differentiated limit does not apply (guide § Rate
-		// limiting).
 		return rateLimitInput{clear: true}, nil
 	}
 	maxMessages, err := parsePositiveInt(r.PostFormValue("max_messages"), 0)
@@ -57,10 +44,6 @@ func parseRateLimitForm(r *http.Request) (rateLimitInput, error) {
 	return rateLimitInput{ips: ips, maxMessages: maxMessages, windowSeconds: windowSeconds}, nil
 }
 
-// parseIPList parses the allowed-IP field (IPs separated by newlines, commas or
-// whitespace) into a deduplicated list of canonical addresses, rejecting any
-// token that is not a valid IP (security.md). The values are only ever stored as
-// SQLite parameters and compared in the milter, never written to a config file.
 func parseIPList(raw string) ([]string, error) {
 	fields := strings.FieldsFunc(raw, func(r rune) bool {
 		return r == '\n' || r == '\r' || r == ',' || r == ' ' || r == '\t' || r == ';'
@@ -81,8 +64,6 @@ func parseIPList(raw string) ([]string, error) {
 	return out, nil
 }
 
-// parsePositiveInt parses a trimmed integer field, returning def when it is
-// blank. A non-numeric value returns an error.
 func parsePositiveInt(raw string, def int) (int, error) {
 	raw = strings.TrimSpace(raw)
 	if raw == "" {
@@ -91,23 +72,20 @@ func parsePositiveInt(raw string, def int) (int, error) {
 	return strconv.Atoi(raw)
 }
 
-// handleDomainRateLimit saves or clears a domain-level differentiated rate
-// limit (guide § Rate limiting). No reload is needed — the milter reads the
-// row live.
-func (s *Server) handleDomainRateLimit(w http.ResponseWriter, r *http.Request) {
-	d, ok := s.lookupDomain(w, r)
+func (h *Handlers) HandleDomainRateLimit(w http.ResponseWriter, r *http.Request) {
+	d, ok := h.lookupDomain(w, r)
 	if !ok {
 		return
 	}
 	in, err := parseRateLimitForm(r)
 	if err != nil {
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
 			FormMode:     store.AddressModeWildcard,
 			RateLimitErr: err.Error(),
 		})
 		return
 	}
-	if err := s.applyRateLimit(in, s.domains.SaveRateLimit, s.domains.ClearRateLimit, d.ID); err != nil {
+	if err := h.applyRateLimit(in, h.domains.SaveRateLimit, h.domains.ClearRateLimit, d.ID); err != nil {
 		logf("panel: domain %d: save rate limit: %v", d.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
@@ -115,27 +93,25 @@ func (s *Server) handleDomainRateLimit(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?ratelimit=1", d.ID), http.StatusSeeOther)
 }
 
-// handleAppRateLimit saves or clears an application-level differentiated rate
-// limit (guide § Rate limiting).
-func (s *Server) handleAppRateLimit(w http.ResponseWriter, r *http.Request) {
-	a, ok := s.lookupApplication(w, r)
+func (h *Handlers) HandleAppRateLimit(w http.ResponseWriter, r *http.Request) {
+	a, ok := h.lookupApplication(w, r)
 	if !ok {
 		return
 	}
-	d, err := s.domains.Get(a.DomainID)
+	d, err := h.domains.Get(a.DomainID)
 	if err != nil {
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
 	in, err := parseRateLimitForm(r)
 	if err != nil {
-		s.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
+		h.renderDomainDetail(w, r, http.StatusBadRequest, d, detailView{
 			FormMode:     store.AddressModeWildcard,
 			RateLimitErr: fmt.Sprintf("%s: %s", a.Login, err.Error()),
 		})
 		return
 	}
-	if err := s.applyRateLimit(in, s.apps.SaveRateLimit, s.apps.ClearRateLimit, a.ID); err != nil {
+	if err := h.applyRateLimit(in, h.apps.SaveRateLimit, h.apps.ClearRateLimit, a.ID); err != nil {
 		logf("panel: application %d: save rate limit: %v", a.ID, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
@@ -143,9 +119,7 @@ func (s *Server) handleAppRateLimit(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, fmt.Sprintf("/domains/%d?ratelimit=1", a.DomainID), http.StatusSeeOther)
 }
 
-// applyRateLimit dispatches a validated input to the save or clear method of the
-// relevant service, keyed by the domain or application id.
-func (s *Server) applyRateLimit(
+func (h *Handlers) applyRateLimit(
 	in rateLimitInput,
 	save func(id int64, ips []string, maxMessages, windowSeconds int) error,
 	clear func(id int64) error,

internal/web/handlers/handlers_status.go

@@ -0,0 +1,111 @@
+package handlers
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/mixeme/selfpost/internal/health"
+	"github.com/mixeme/selfpost/internal/web/auth"
+)
+
+func (h *Handlers) HandleStatus(w http.ResponseWriter, r *http.Request) {
+	data := h.statusBody()
+	srv := h.dns.Server(h.cfg.Hostname, false)
+
+	data["Title"] = "SelfPost — status"
+	data["User"] = auth.CurrentUser(r)
+	data["Active"] = "status"
+	data["Flash"] = statusFlash(r)
+	data["Hostname"] = h.cfg.Hostname
+	data["PTR"] = srv.PTR
+	h.view.Render(w, http.StatusOK, "status", data)
+}
+
+func (h *Handlers) HandleStatusFragment(w http.ResponseWriter, _ *http.Request) {
+	h.view.RenderFragment(w, http.StatusOK, "status_body", h.statusBody())
+}
+
+func (h *Handlers) HandleStatusRecheck(w http.ResponseWriter, r *http.Request) {
+	h.dns.Server(h.cfg.Hostname, true)
+	http.Redirect(w, r, "/status?rechecked=1", http.StatusSeeOther)
+}
+
+func (h *Handlers) statusBody() map[string]any {
+	procs, procErr := health.Processes()
+	procStatus := health.StatusUnknown
+	if procErr != nil {
+		logf("panel: status: supervisorctl: %v", procErr)
+	} else {
+		for _, p := range procs {
+			procStatus = health.Worst(procStatus, p.Status)
+		}
+	}
+
+	queueText, queueErr := readQueue()
+	queueStatus := health.StatusOK
+	if queueErr != "" {
+		queueStatus = health.StatusWarn
+	}
+
+	cert := health.CheckCertificate(h.cfg.TLSCertFile)
+	sockets := []health.Socket{
+		health.CheckSocket("OpenDKIM", h.cfg.OpenDKIMSocket, true),
+		health.CheckSocket("send-log", h.cfg.JournalSocket, false),
+	}
+	socketStatus := health.StatusUnknown
+	for _, sock := range sockets {
+		socketStatus = health.Worst(socketStatus, sock.Status)
+	}
+
+	machine := h.machine.Sample()
+
+	overall := health.Worst(procStatus, queueStatus, cert.Status, socketStatus, machine.Status)
+	return map[string]any{
+		"Processes":      procs,
+		"ProcessError":   procErr != nil,
+		"ProcessStatus":  procStatus,
+		"QueueSummary":   queueSummary(queueText),
+		"QueueError":     queueErr,
+		"QueueStatus":    queueStatus,
+		"Machine":        machine,
+		"Cert":           cert,
+		"Sockets":        sockets,
+		"SocketStatus":   socketStatus,
+		"OverallStatus":  overall,
+		"OverallHeading": overallHeading(overall),
+	}
+}
+
+func queueSummary(out string) string {
+	lines := strings.Split(strings.TrimSpace(out), "\n")
+	for i := len(lines) - 1; i >= 0; i-- {
+		if line := strings.TrimSpace(lines[i]); line != "" {
+			return strings.TrimSpace(strings.TrimPrefix(line, "--"))
+		}
+	}
+	return ""
+}
+
+func overallHeading(worst health.Status) string {
+	switch worst {
+	case health.StatusError:
+		return "A component needs attention — see the details below."
+	case health.StatusWarn:
+		return "Running, with warnings below."
+	case health.StatusOK:
+		return "All components are running normally."
+	default:
+		return "Some checks could not be performed."
+	}
+}
+
+func statusFlash(r *http.Request) string {
+	switch {
+	case r.URL.Query().Get("reloaded") != "":
+		return "Configuration regenerated from the database; OpenDKIM and Postfix have re-read it."
+	case r.URL.Query().Get("rechecked") != "":
+		return "DNS re-checked."
+	default:
+		return ""
+	}
+}

internal/web/handlers/testutil_test.go

@@ -0,0 +1,16 @@
+package handlers
+
+import (
+	"testing"
+
+	"github.com/mixeme/selfpost/internal/web/view"
+)
+
+func mustView(t *testing.T) *view.Engine {
+	t.Helper()
+	v, err := view.New("test")
+	if err != nil {
+		t.Fatalf("view: %v", err)
+	}
+	return v
+}

internal/web/handlers_auth.go

@@ -1,198 +0,0 @@
-package web
-
-import (
-	"errors"
-	"net/http"
-	"strings"
-
-	"github.com/mixeme/selfpost/internal/store"
-	"golang.org/x/crypto/bcrypt"
-)
-
-// The panel session cookie's two possible names. In the production shape —
-// TLS in front, so CookieSecure — it carries the __Host- prefix, which turns
-// what the cookie's attributes merely promise into something the browser
-// enforces: Secure, Path=/ and, the point of the exercise, no Domain
-// attribute, so no other host may set a cookie by this name.
-// The prefix is only valid on a Secure cookie, so a development instance on
-// plain HTTP has to keep the bare name: with the prefix the browser would
-// discard the Set-Cookie outright and logging in would silently never stick.
-const (
-	sessionCookieBase     = "selfpost_session"
-	sessionCookiePrefixed = "__Host-" + sessionCookieBase
-)
-
-// sessionCookie is the session cookie's name for this deployment.
-func (s *Server) sessionCookie() string {
-	if s.cfg.CookieSecure {
-		return sessionCookiePrefixed
-	}
-	return sessionCookieBase
-}
-
-// sessionToken returns the session token the request carries, if exactly one
-// cookie of that name is present.
-//
-// It walks r.Cookies() rather than calling r.Cookie, which silently returns
-// the first match. Two cookies with the same name mean somebody other than
-// this panel set one of them — a host on the same registrable domain can,
-// with Domain=example.com, and the browser will then send both — and RFC 6265
-// makes the older one come first, so "the first match" is precisely the
-// attacker's. The value cannot be forged into a valid session, so the effect
-// is denial of service, not compromise; refusing the request and saying so in
-// the log is what makes it diagnosable instead of an endless login loop. The
-// __Host- prefix prevents this outright, but only where it applies — this
-// check also covers the plain-HTTP development shape.
-func (s *Server) sessionToken(r *http.Request) (string, bool) {
-	name := s.sessionCookie()
-	var token string
-	var n int
-	for _, c := range r.Cookies() {
-		if c.Name == name {
-			n++
-			token = c.Value
-		}
-	}
-	switch n {
-	case 0:
-		return "", false
-	case 1:
-		return token, true
-	default:
-		logf("panel: %s %s carries %d cookies named %q — treating the request as signed out; "+
-			"another host on this domain is overwriting the session cookie, clear the cookies for the parent domain",
-			r.Method, r.URL.Path, n, name)
-		return "", false
-	}
-}
-
-// clearSessionCookies expires the session cookie under both names, so an
-// upgrade that switches to the __Host- prefix does not leave the old cookie
-// sitting in the browser until it is closed.
-func (s *Server) clearSessionCookies(w http.ResponseWriter) {
-	for _, name := range []string{sessionCookieBase, sessionCookiePrefixed} {
-		http.SetCookie(w, &http.Cookie{
-			Name:     name,
-			Value:    "",
-			Path:     "/",
-			MaxAge:   -1,
-			HttpOnly: true,
-			// The prefixed name is only accepted at all when Secure is set,
-			// including on the expiring copy.
-			Secure:   s.cfg.CookieSecure || name == sessionCookiePrefixed,
-			SameSite: http.SameSiteLaxMode,
-		})
-	}
-}
-
-// handleLogin serves the login form (GET) and authenticates (POST). Until an
-// administrator exists there is nobody to log in, so it points at setup.
-func (s *Server) handleLogin(w http.ResponseWriter, r *http.Request) {
-	exists, err := s.store.AdminExists()
-	if err != nil {
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	if !exists {
-		// No admin yet: login is meaningless. Send a clear message rather than
-		// a failing form.
-		s.render(w, http.StatusOK, "login", map[string]any{
-			"Title":     "SelfPost — Sign in",
-			"Active":    "login",
-			"SetupHint": true,
-		})
-		return
-	}
-
-	switch r.Method {
-	case http.MethodGet:
-		s.renderLogin(w, http.StatusOK, "")
-	case http.MethodPost:
-		s.submitLogin(w, r)
-	default:
-		w.Header().Set("Allow", "GET, POST")
-		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
-	}
-}
-
-func (s *Server) renderLogin(w http.ResponseWriter, status int, formErr string) {
-	// Active names the page for the layout even though no navigation is drawn
-	// here: it is what puts page-login on <main>, which the stylesheet uses to
-	// give the signed-out pages a column the width of their own card.
-	s.render(w, status, "login", map[string]any{
-		"Title":  "SelfPost — Sign in",
-		"Active": "login",
-		"Error":  formErr,
-	})
-}
-
-func (s *Server) submitLogin(w http.ResponseWriter, r *http.Request) {
-	// Brute-force throttle by client IP (security.md).
-	if !s.loginLimiter.Allow(clientIP(r, s.trustedProxies)) {
-		s.renderLogin(w, http.StatusTooManyRequests, "Too many attempts. Please wait and try again.")
-		return
-	}
-	if err := r.ParseForm(); err != nil {
-		s.renderLogin(w, http.StatusBadRequest, "Invalid form submission.")
-		return
-	}
-	username := strings.TrimSpace(r.PostFormValue("username"))
-	password := r.PostFormValue("password")
-
-	admin, err := s.store.GetAdmin()
-	if err != nil {
-		if !errors.Is(err, store.ErrNoAdmin) {
-			logf("panel: login: get admin failed: %v", err)
-		}
-		s.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
-		return
-	}
-
-	// Always run bcrypt so timing does not distinguish "wrong user" from
-	// "wrong password", and compare the username too.
-	pwErr := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(password))
-	if username != admin.Username || pwErr != nil {
-		s.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
-		return
-	}
-
-	token := s.sessions.Create(admin.Username)
-	s.setSessionCookie(w, token)
-	http.Redirect(w, r, "/", http.StatusSeeOther)
-}
-
-// setSessionCookie (re)issues the session cookie with a fresh Max-Age equal
-// to the sliding idle window (plan B.1), so the browser-side expiry tracks
-// whatever the database row was just set to — at login, and again whenever
-// requireAuth extends an active session.
-func (s *Server) setSessionCookie(w http.ResponseWriter, token string) {
-	http.SetCookie(w, &http.Cookie{
-		Name:     s.sessionCookie(),
-		Value:    token,
-		Path:     "/",
-		MaxAge:   s.sessions.MaxAge(),
-		HttpOnly: true,
-		Secure:   s.cfg.CookieSecure,
-		SameSite: http.SameSiteLaxMode,
-	})
-}
-
-// handleLogout destroys the session and clears the cookie.
-func (s *Server) handleLogout(w http.ResponseWriter, r *http.Request) {
-	if r.Method != http.MethodPost {
-		w.Header().Set("Allow", "POST")
-		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
-		return
-	}
-	// Destroy every token presented under the session cookie's name: if a
-	// shadowing duplicate is present (see sessionToken) one of them is the
-	// real session, and a value that names no session is simply not found.
-	name := s.sessionCookie()
-	for _, c := range r.Cookies() {
-		if c.Name == name {
-			s.sessions.Destroy(c.Value)
-		}
-	}
-	s.clearSessionCookies(w)
-	http.Redirect(w, r, "/login", http.StatusSeeOther)
-}

internal/web/handlers_domains.go

@@ -1,210 +0,0 @@
-package web
-
-import (
-	"errors"
-	"fmt"
-	"net/http"
-	"strconv"
-	"sync"
-
-	"github.com/mixeme/selfpost/internal/health"
-	"github.com/mixeme/selfpost/internal/store"
-)
-
-// domainRow is one line of the domain list: the stored domain plus the rolled-up
-// verdict of its published DNS records, so the operator sees which domains still
-// need a record published without opening each one.
-type domainRow struct {
-	store.Domain
-	DNS health.Status
-}
-
-// handleDashboard is the authenticated landing page: the list of sending
-// domains with their DKIM/selector and application counts, plus the add-domain
-// form (product.md).
-func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
-	s.renderDashboard(w, r, http.StatusOK, "", "")
-}
-
-// renderDashboard renders the domain list. formErr and formName repopulate the
-// add-domain form after a rejected submission; flash surfaces a one-shot status
-// message keyed by a redirect query flag (never reflected user input).
-func (s *Server) renderDashboard(w http.ResponseWriter, r *http.Request, status int, formErr, formName string) {
-	domains, err := s.domains.List()
-	if err != nil {
-		logf("panel: dashboard: list domains: %v", err)
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	s.render(w, status, "dashboard", map[string]any{
-		"Title":    "SelfPost",
-		"User":     currentUser(r),
-		"Active":   "domains",
-		"Domains":  s.domainRows(domains),
-		"Error":    formErr,
-		"FormName": formName,
-		"Flash":    dashboardFlash(r),
-	})
-}
-
-// domainRows attaches each domain's DNS verdict to its row. The checks run
-// concurrently rather than one after another: each carries its own timeout, so
-// in series a dead resolver would multiply that wait by the number of domains
-// and the list would look hung. The checker caches results for a few minutes,
-// so a repeat view of the list costs no lookups at all, and it is the same
-// cache the domain page fills — opening a domain after the list is free.
-func (s *Server) domainRows(domains []store.Domain) []domainRow {
-	profileEmail := ""
-	if admin, err := s.store.GetAdmin(); err == nil {
-		profileEmail = admin.DMARCReportEmail
-	}
-	rows := make([]domainRow, len(domains))
-	var wg sync.WaitGroup
-	for i, d := range domains {
-		rows[i] = domainRow{Domain: d, DNS: health.StatusUnknown}
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			record, err := s.domains.DKIMRecord(d)
-			if err != nil {
-				// Without the expected key there is nothing to compare DNS
-				// against; leave the row unknown rather than accusing the
-				// domain of a misconfiguration this server caused.
-				logf("panel: dashboard: domain %d: dkim record: %v", d.ID, err)
-				return
-			}
-			dns, _ := s.domainDNS(d, record, profileEmail, false)
-			rows[i].DNS = dns.Overall
-		}()
-	}
-	wg.Wait()
-	return rows
-}
-
-// dashboardFlash maps a fixed redirect flag to a fixed message, so status text
-// after a redirect is never attacker-influenced.
-func dashboardFlash(r *http.Request) string {
-	if r.URL.Query().Get("deleted") != "" {
-		return "Domain deleted."
-	}
-	return ""
-}
-
-// handleAddDomain validates the submitted name, creates the domain (DKIM key +
-// OpenDKIM reload), and redirects to the domain's page so the DNS record to
-// publish is shown (product.md).
-func (s *Server) handleAddDomain(w http.ResponseWriter, r *http.Request) {
-	if err := r.ParseForm(); err != nil {
-		s.renderDashboard(w, r, http.StatusBadRequest, "Invalid form submission.", "")
-		return
-	}
-	raw := r.PostFormValue("name")
-	name := normalizeDomain(raw)
-	if err := validateDomain(name); err != nil {
-		s.renderDashboard(w, r, http.StatusBadRequest, err.Error(), raw)
-		return
-	}
-
-	d, err := s.domains.Add(name)
-	if err != nil {
-		if errors.Is(err, store.ErrDomainExists) {
-			s.renderDashboard(w, r, http.StatusConflict, "That domain is already configured.", raw)
-			return
-		}
-		logf("panel: add domain %q: %v", name, err)
-		s.renderDashboard(w, r, http.StatusInternalServerError,
-			"Could not add the domain. Please check the logs and try again.", raw)
-		return
-	}
-	http.Redirect(w, r, fmt.Sprintf("/domains/%d", d.ID), http.StatusSeeOther)
-}
-
-// handleDeleteConfirm shows the cascade warning before a domain is removed: the
-// panel must explicitly state that all bound applications go with it (product.md).
-func (s *Server) handleDeleteConfirm(w http.ResponseWriter, r *http.Request) {
-	d, ok := s.lookupDomain(w, r)
-	if !ok {
-		return
-	}
-	s.render(w, http.StatusOK, "domain_delete", map[string]any{
-		"Title":  "SelfPost — delete " + d.Name,
-		"User":   currentUser(r),
-		"Active": "domains",
-		"Domain": d,
-	})
-}
-
-// handleDeleteDomain performs the deletion (cascade + DKIM key + OpenDKIM reload)
-// and returns to the domain list.
-func (s *Server) handleDeleteDomain(w http.ResponseWriter, r *http.Request) {
-	id, ok := parseDomainID(w, r)
-	if !ok {
-		return
-	}
-	// Drop any cached DNS verdict for the name while it is still resolvable, so
-	// re-adding the domain later starts from a fresh check instead of a stale
-	// one from before it was removed.
-	if d, err := s.domains.Get(id); err == nil {
-		defer s.dns.Forget(d.Name)
-	}
-	if err := s.domains.Delete(id); err != nil {
-		if errors.Is(err, store.ErrDomainNotFound) {
-			http.NotFound(w, r)
-			return
-		}
-		logf("panel: delete domain %d: %v", id, err)
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	http.Redirect(w, r, "/domains?deleted=1", http.StatusSeeOther)
-}
-
-// handleReload re-applies both the OpenDKIM configuration and the Postfix
-// sender map on demand (architecture.md § Panel HTTP surface). Each Resync
-// regenerates its files from the database and reloads its daemon, so the
-// button doubles as a drift-recovery. The button lives on the status page: it
-// is a "put the daemons back in the state the database describes" action,
-// which belongs with the rest of the server-health screen rather than in the
-// domain list's top bar.
-func (s *Server) handleReload(w http.ResponseWriter, r *http.Request) {
-	if err := s.domains.Resync(); err != nil {
-		logf("panel: manual reload (opendkim): %v", err)
-		http.Error(w, "reload failed", http.StatusInternalServerError)
-		return
-	}
-	if err := s.apps.Resync(); err != nil {
-		logf("panel: manual reload (postfix): %v", err)
-		http.Error(w, "reload failed", http.StatusInternalServerError)
-		return
-	}
-	http.Redirect(w, r, "/status?reloaded=1", http.StatusSeeOther)
-}
-
-// lookupDomain resolves the {id} path value to a domain, writing a 404 for a
-// bad id or a missing domain and reporting ok=false in that case.
-func (s *Server) lookupDomain(w http.ResponseWriter, r *http.Request) (store.Domain, bool) {
-	id, ok := parseDomainID(w, r)
-	if !ok {
-		return store.Domain{}, false
-	}
-	d, err := s.domains.Get(id)
-	if err != nil {
-		if errors.Is(err, store.ErrDomainNotFound) {
-			http.NotFound(w, r)
-			return store.Domain{}, false
-		}
-		logf("panel: get domain %d: %v", id, err)
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return store.Domain{}, false
-	}
-	return d, true
-}
-
-func parseDomainID(w http.ResponseWriter, r *http.Request) (int64, bool) {
-	id, err := strconv.ParseInt(r.PathValue("id"), 10, 64)
-	if err != nil || id <= 0 {
-		http.NotFound(w, r)
-		return 0, false
-	}
-	return id, true
-}

internal/web/handlers_license.go

@@ -1,25 +0,0 @@
-package web
-
-import (
-	"net/http"
-
-	"github.com/mixeme/selfpost/internal/legal"
-)
-
-// handleLicense serves the AGPL-3.0 text so every interactive page's
-// "License" footer link works without leaving the panel (AGPL Appropriate
-// Legal Notices). Unauthenticated on purpose: the notice must be reachable
-// from the login and setup screens too.
-func (s *Server) handleLicense(w http.ResponseWriter, r *http.Request) {
-	if r.Method != http.MethodGet && r.Method != http.MethodHead {
-		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
-		return
-	}
-	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
-	w.Header().Set("X-Content-Type-Options", "nosniff")
-	w.WriteHeader(http.StatusOK)
-	if r.Method == http.MethodHead {
-		return
-	}
-	_, _ = w.Write(legal.License)
-}

internal/web/handlers_license_test.go

@@ -10,10 +10,9 @@ import (
 )
 
 func TestLicenseHandlerServesAGPL(t *testing.T) {
-	s := &Server{}
 	rec := httptest.NewRecorder()
 	req := httptest.NewRequest(http.MethodGet, "/license", nil)
-	s.handleLicense(rec, req)
+	handleLicense(rec, req)
 
 	if rec.Code != http.StatusOK {
 		t.Fatalf("status = %d, want 200", rec.Code)
@@ -32,10 +31,9 @@ func TestLicenseHandlerServesAGPL(t *testing.T) {
 }
 
 func TestLicenseHandlerRejectsNonGET(t *testing.T) {
-	s := &Server{}
 	rec := httptest.NewRecorder()
 	req := httptest.NewRequest(http.MethodPost, "/license", nil)
-	s.handleLicense(rec, req)
+	handleLicense(rec, req)
 	if rec.Code != http.StatusMethodNotAllowed {
 		t.Fatalf("status = %d, want 405", rec.Code)
 	}

internal/web/handlers_setup.go

@@ -1,99 +0,0 @@
-package web
-
-import (
-	"net/http"
-	"strings"
-
-	"golang.org/x/crypto/bcrypt"
-)
-
-// handleSetup serves the one-time administrator creation flow at
-// /setup/<token> (security.md). Once an administrator exists the whole route
-// returns 404; an invalid or expired token is indistinguishable from a missing
-// page, also 404.
-func (s *Server) handleSetup(w http.ResponseWriter, r *http.Request) {
-	// Route-specific rate limit, separate from login (security.md).
-	if !s.setupLimiter.Allow(clientIP(r, s.trustedProxies)) {
-		http.Error(w, "too many requests", http.StatusTooManyRequests)
-		return
-	}
-
-	token := strings.TrimPrefix(r.URL.Path, "/setup/")
-	// Reject nested/garbage paths outright.
-	if token == "" || strings.Contains(token, "/") {
-		http.NotFound(w, r)
-		return
-	}
-	if !s.setup.validate(token) {
-		http.NotFound(w, r)
-		return
-	}
-
-	switch r.Method {
-	case http.MethodGet:
-		s.renderSetupForm(w, http.StatusOK, token, "")
-	case http.MethodPost:
-		s.submitSetup(w, r, token)
-	default:
-		w.Header().Set("Allow", "GET, POST")
-		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
-	}
-}
-
-func (s *Server) renderSetupForm(w http.ResponseWriter, status int, token, formErr string) {
-	s.render(w, status, "setup", map[string]any{
-		"Title":  "SelfPost — Create administrator",
-		"Active": "setup",
-		"Token":  token,
-		"Error":  formErr,
-	})
-}
-
-func (s *Server) submitSetup(w http.ResponseWriter, r *http.Request, token string) {
-	if err := r.ParseForm(); err != nil {
-		s.renderSetupForm(w, http.StatusBadRequest, token, "Invalid form submission.")
-		return
-	}
-	username := strings.TrimSpace(r.PostFormValue("username"))
-	password := r.PostFormValue("password")
-	confirm := r.PostFormValue("password_confirm")
-
-	if err := validateUsername(username); err != nil {
-		s.renderSetupForm(w, http.StatusBadRequest, token, err.Error())
-		return
-	}
-	if password != confirm {
-		s.renderSetupForm(w, http.StatusBadRequest, token, "Passwords do not match.")
-		return
-	}
-	if err := validateAdminPassword(password); err != nil {
-		s.renderSetupForm(w, http.StatusBadRequest, token, err.Error())
-		return
-	}
-
-	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
-	if err != nil {
-		logf("panel: setup: hashing password failed: %v", err)
-		s.renderSetupForm(w, http.StatusInternalServerError, token, "Internal error. Please try again.")
-		return
-	}
-
-	if err := s.store.CreateAdmin(username, string(hash)); err != nil {
-		// A concurrent submission may have already created the admin; the
-		// id=1 / non-empty-table guard makes this the second writer. Treat it
-		// as "setup already done" rather than an error.
-		if exists, _ := s.store.AdminExists(); exists {
-			s.setup.complete()
-			http.Redirect(w, r, "/login", http.StatusSeeOther)
-			return
-		}
-		logf("panel: setup: create admin failed: %v", err)
-		s.renderSetupForm(w, http.StatusInternalServerError, token, "Internal error. Please try again.")
-		return
-	}
-
-	// Setup is now permanently complete: burn the token (security.md).
-	s.setup.complete()
-	logf("panel: administrator %q created; setup link is now disabled", username)
-	http.Redirect(w, r, "/login", http.StatusSeeOther)
-}

internal/web/handlers_status.go

@@ -1,140 +0,0 @@
-package web
-
-import (
-	"net/http"
-	"strings"
-
-	"github.com/mixeme/selfpost/internal/health"
-)
-
-// handleStatus renders the server status page: the panel's landing page and the
-// one screen that answers "is the service healthy and will mail be accepted".
-// The cheap local checks live in the polled "status_body"
-// fragment; the hostname/PTR lookup and the configuration reload sit outside it,
-// because neither belongs on a five-second timer.
-func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
-	data := s.statusBody()
-	srv := s.dns.Server(s.cfg.Hostname, false)
-
-	data["Title"] = "SelfPost — status"
-	data["User"] = currentUser(r)
-	data["Active"] = "status"
-	data["Flash"] = statusFlash(r)
-	data["Hostname"] = s.cfg.Hostname
-	data["PTR"] = srv.PTR
-	s.render(w, http.StatusOK, "status", data)
-}
-
-// handleStatusFragment serves the HTMX polling fragment for the local checks
-// (architecture.md § Panel HTTP surface: fragment endpoints return HTML, not
-// JSON).
-func (s *Server) handleStatusFragment(w http.ResponseWriter, _ *http.Request) {
-	s.renderFragment(w, http.StatusOK, "status_body", s.statusBody())
-}
-
-// handleStatusRecheck forces a fresh hostname/PTR lookup, bypassing the cache,
-// and returns to the page. DNS is the one part of this screen that talks to the
-// network, so it refreshes on demand rather than with the poll.
-func (s *Server) handleStatusRecheck(w http.ResponseWriter, r *http.Request) {
-	s.dns.Server(s.cfg.Hostname, true)
-	http.Redirect(w, r, "/status?rechecked=1", http.StatusSeeOther)
-}
-
-// statusBody collects the local checks the fragment renders. Each one
-// reports its own problem rather than failing the page, so a broken component
-// costs one line and not the whole screen.
-func (s *Server) statusBody() map[string]any {
-	procs, procErr := health.Processes()
-	procStatus := health.StatusUnknown
-	if procErr != nil {
-		// Outside the container (or if the control socket is gone) there is
-		// nothing to report — "unknown", not "everything is broken".
-		logf("panel: status: supervisorctl: %v", procErr)
-	} else {
-		for _, p := range procs {
-			procStatus = health.Worst(procStatus, p.Status)
-		}
-	}
-
-	queueText, queueErr := readQueue()
-	queueStatus := health.StatusOK
-	if queueErr != "" {
-		queueStatus = health.StatusWarn
-	}
-
-	cert := health.CheckCertificate(s.cfg.TLSCertFile)
-	sockets := []health.Socket{
-		// OpenDKIM signs every outgoing message and Postfix is configured to
-		// tempfail without it: a missing socket stops mail.
-		health.CheckSocket("OpenDKIM", s.cfg.OpenDKIMSocket, true),
-		// The journal-milter only records the send log and fails open.
-		health.CheckSocket("send-log", s.cfg.JournalSocket, false),
-	}
-	socketStatus := health.StatusUnknown
-	for _, sock := range sockets {
-		socketStatus = health.Worst(socketStatus, sock.Status)
-	}
-
-	// Resource usage of the machine underneath. It is graded like the rest —
-	// a processor that is fully busy or a machine out of memory delays or
-	// kills the mail path — so it counts towards the headline verdict, and
-	// its rates are measured against the previous poll (internal/health).
-	machine := s.machine.Sample()
-
-	overall := health.Worst(procStatus, queueStatus, cert.Status, socketStatus, machine.Status)
-	return map[string]any{
-		"Processes":      procs,
-		"ProcessError":   procErr != nil,
-		"ProcessStatus":  procStatus,
-		"QueueSummary":   queueSummary(queueText),
-		"QueueError":     queueErr,
-		"QueueStatus":    queueStatus,
-		"Machine":        machine,
-		"Cert":           cert,
-		"Sockets":        sockets,
-		"SocketStatus":   socketStatus,
-		"OverallStatus":  overall,
-		"OverallHeading": overallHeading(overall),
-	}
-}
-
-// queueSummary reduces postqueue's listing to the one line worth showing on
-// the status page; the full listing has its own screen (architecture.md §
-// Panel HTTP surface). postqueue prints either "Mail queue is empty" or a
-// trailing "-- N Kbytes in M Requests."
-func queueSummary(out string) string {
-	lines := strings.Split(strings.TrimSpace(out), "\n")
-	for i := len(lines) - 1; i >= 0; i-- {
-		if line := strings.TrimSpace(lines[i]); line != "" {
-			return strings.TrimSpace(strings.TrimPrefix(line, "--"))
-		}
-	}
-	return ""
-}
-
-// overallHeading turns the worst check into the page's one-line verdict.
-func overallHeading(worst health.Status) string {
-	switch worst {
-	case health.StatusError:
-		return "A component needs attention — see the details below."
-	case health.StatusWarn:
-		return "Running, with warnings below."
-	case health.StatusOK:
-		return "All components are running normally."
-	default:
-		return "Some checks could not be performed."
-	}
-}
-
-// statusFlash maps a fixed redirect flag to a fixed message, so status text
-// after a redirect is never attacker-influenced.
-func statusFlash(r *http.Request) string {
-	switch {
-	case r.URL.Query().Get("reloaded") != "":
-		return "Configuration regenerated from the database; OpenDKIM and Postfix have re-read it."
-	case r.URL.Query().Get("rechecked") != "":
-		return "DNS re-checked."
-	default:
-		return ""
-	}
-}

internal/web/middleware.go

@@ -1,55 +0,0 @@
-package web
-
-import (
-	"context"
-	"net/http"
-)
-
-type ctxKey int
-
-const usernameKey ctxKey = 0
-
-// requireAuth wraps a handler so only requests with a valid session cookie
-// reach it; everyone else is redirected to the login page. The authenticated
-// username is stashed in the request context for downstream handlers.
-//
-// It also extends the sliding session (plan B.1) on activity, defined as
-// everything except a GET request carrying HX-Request: the four monitoring
-// fragments (/status/fragment, /mail-queue/body, /system-log/body,
-// /deliveries/rows)
-// poll on a timer regardless of whether anyone is looking at the tab, so
-// counting those as activity would make "N days idle" mean "N days since a
-// browser tab was last open" instead.
-func (s *Server) requireAuth(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		token, ok := s.sessionToken(r)
-		if !ok {
-			http.Redirect(w, r, "/login", http.StatusSeeOther)
-			return
-		}
-		username, ok := s.sessions.Lookup(token)
-		if !ok {
-			http.Redirect(w, r, "/login", http.StatusSeeOther)
-			return
-		}
-		if isSessionActivity(r) && s.sessions.Touch(token) {
-			s.setSessionCookie(w, token)
-		}
-		ctx := context.WithValue(r.Context(), usernameKey, username)
-		next.ServeHTTP(w, r.WithContext(ctx))
-	})
-}
-
-// isSessionActivity reports whether a request counts as administrator
-// activity for the sliding session timeout, per requireAuth's doc comment.
-func isSessionActivity(r *http.Request) bool {
-	return !(r.Method == http.MethodGet && r.Header.Get("HX-Request") != "")
-}
-
-// currentUser returns the authenticated username from the request context.
-func currentUser(r *http.Request) string {
-	if v, ok := r.Context().Value(usernameKey).(string); ok {
-		return v
-	}
-	return ""
-}

internal/web/session_test.go

@@ -1,84 +0,0 @@
-package web
-
-import (
-	"path/filepath"
-	"testing"
-	"time"
-
-	"github.com/mixeme/selfpost/internal/store"
-)
-
-func newTestSessionStore(t *testing.T) *sessionStore {
-	t.Helper()
-	st, err := store.Open(filepath.Join(t.TempDir(), "test.db"))
-	if err != nil {
-		t.Fatalf("open store: %v", err)
-	}
-	t.Cleanup(func() { st.Close() })
-	return newSessionStore(st, 7*24*time.Hour)
-}
-
-func TestSessionRename(t *testing.T) {
-	s := newTestSessionStore(t)
-	token := s.Create("admin")
-
-	s.Rename(token, "operator")
-
-	name, ok := s.Lookup(token)
-	if !ok {
-		t.Fatal("session lost after rename")
-	}
-	if name != "operator" {
-		t.Fatalf("session username = %q, want %q", name, "operator")
-	}
-}
-
-// A password change must invalidate every other session (so a cookie captured
-// under the old password stops working) while keeping the one performing the
-// change signed in.
-func TestSessionDestroyOthers(t *testing.T) {
-	s := newTestSessionStore(t)
-	keep := s.Create("admin")
-	other := s.Create("admin")
-
-	s.DestroyOthers(keep)
-
-	if _, ok := s.Lookup(keep); !ok {
-		t.Fatal("current session was destroyed")
-	}
-	if _, ok := s.Lookup(other); ok {
-		t.Fatal("other session survived")
-	}
-}
-
-// A session past its sliding idle expiry must not be honoured.
-func TestSessionLookupRejectsExpired(t *testing.T) {
-	s := newTestSessionStore(t)
-	s.idle = -time.Minute // already expired the instant it's created
-	token := s.Create("admin")
-
-	if _, ok := s.Lookup(token); ok {
-		t.Fatal("expired session was accepted")
-	}
-}
-
-// Touch must not rewrite the expiry (or report a renewal) inside the
-// once-an-hour throttle window, so an active tab's polling doesn't turn into
-// a database write per request.
-func TestSessionTouchThrottled(t *testing.T) {
-	s := newTestSessionStore(t)
-	token := s.Create("admin")
-
-	if s.Touch(token) {
-		t.Fatal("touch renewed a session created moments ago")
-	}
-
-	// Back-date the session's last renewal by rewriting its expiry, as if it
-	// had been created (or last renewed) 2 hours ago rather than moments ago.
-	if err := s.store.RenewSession(hashToken(token), time.Now().Add(-2*time.Hour).Add(s.idle)); err != nil {
-		t.Fatalf("renew session: %v", err)
-	}
-	if !s.Touch(token) {
-		t.Fatal("touch did not renew a session past the throttle window")
-	}
-}

internal/web/validate/validate.go

@@ -1,4 +1,5 @@
-package web
+// Package validate holds shared server-side form validation for the panel.
+package validate
 
 import (
 	"fmt"
@@ -6,24 +7,24 @@ import (
 	"unicode"
 )
 
-// minAdminPasswordLen is the floor for the administrator password. The panel is
+// MinAdminPasswordLen is the floor for the administrator password. The panel is
 // public (security.md), so this is deliberately not tiny.
-const minAdminPasswordLen = 12
+const MinAdminPasswordLen = 12
 
 const (
 	minUsernameLen = 3
 	maxUsernameLen = 64
 )
 
-// minSecretFilePasswordLen is the floor for the password protecting an
+// MinSecretFilePasswordLen is the floor for the password protecting an
 // encrypted backup or domain export. Such a file is offline and can be attacked
 // at leisure, so the floor matches the administrator password's rather than the
 // weaker "any password is better than none".
-const minSecretFilePasswordLen = minAdminPasswordLen
+const MinSecretFilePasswordLen = MinAdminPasswordLen
 
-// validateUsername enforces a strict server-side whitelist (security.md):
-// letters, digits, dot, dash, underscore. Client validation is never trusted.
-func validateUsername(u string) error {
+// Username enforces a strict server-side whitelist (security.md): letters,
+// digits, dot, dash, underscore. Client validation is never trusted.
+func Username(u string) error {
 	if len(u) < minUsernameLen || len(u) > maxUsernameLen {
 		return fmt.Errorf("username must be %d-%d characters", minUsernameLen, maxUsernameLen)
 	}
@@ -35,11 +36,11 @@ func validateUsername(u string) error {
 	return nil
 }
 
-// validateAdminPassword enforces a minimum length. Composition rules beyond
-// length tend to reduce entropy in practice, so length is the sole gate.
-func validateAdminPassword(p string) error {
-	if len(p) < minAdminPasswordLen {
-		return fmt.Errorf("password must be at least %d characters", minAdminPasswordLen)
+// AdminPassword enforces a minimum length. Composition rules beyond length tend
+// to reduce entropy in practice, so length is the sole gate.
+func AdminPassword(p string) error {
+	if len(p) < MinAdminPasswordLen {
+		return fmt.Errorf("password must be at least %d characters", MinAdminPasswordLen)
 	}
 	return nil
 }
@@ -50,23 +51,19 @@ func isASCIILetterOrDigit(r rune) bool {
 
 const maxDomainLen = 253 // RFC 1035 limit on a fully-qualified name
 
-// normalizeDomain lower-cases and trims a domain name. Domain names are
+// NormalizeDomain lower-cases and trims a domain name. Domain names are
 // case-insensitive, and the generated OpenDKIM tables/keys use the canonical
 // lower-case form, so we normalise before both validation and storage.
-func normalizeDomain(name string) string {
+func NormalizeDomain(name string) string {
 	return strings.ToLower(strings.TrimSpace(name))
 }
 
-// validateDomain enforces a strict server-side whitelist for sending-domain
-// names (security.md). The result is safe to write verbatim into the OpenDKIM
+// Domain enforces a strict server-side whitelist for sending-domain names
+// (security.md). The result is safe to write verbatim into the OpenDKIM
 // KeyTable/SigningTable and to use as a filesystem path segment: only
 // lower-case letters, digits, '.' and '-' are allowed, in valid DNS label
-// shape. Input must already be normalised with normalizeDomain.
-//
-// This is deliberately stricter than "any string DNS might accept" — no
-// leading/trailing dots or hyphens, no empty or over-long labels, and at least
-// two labels so single-word hostnames cannot be registered as sending domains.
-func validateDomain(name string) error {
+// shape. Input must already be normalised with NormalizeDomain.
+func Domain(name string) error {
 	if name == "" {
 		return fmt.Errorf("domain is required")
 	}
@@ -78,14 +75,14 @@ func validateDomain(name string) error {
 		return fmt.Errorf("domain must include at least one dot (e.g. example.com)")
 	}
 	for _, label := range labels {
-		if err := validateDomainLabel(label); err != nil {
+		if err := domainLabel(label); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
-func validateDomainLabel(label string) error {
+func domainLabel(label string) error {
 	if len(label) == 0 {
 		return fmt.Errorf("domain must not contain an empty label")
 	}
@@ -109,20 +106,20 @@ func validateDomainLabel(label string) error {
 // freemailDomains lists public mail hosts that cannot publish _report._dmarc
 // authorisation for third-party sending domains.
 var freemailDomains = map[string]struct{}{
-	"gmail.com":       {},
-	"googlemail.com":  {},
-	"outlook.com":     {},
-	"hotmail.com":     {},
-	"live.com":        {},
-	"yahoo.com":       {},
-	"icloud.com":      {},
-	"me.com":          {},
-	"proton.me":       {},
-	"protonmail.com":  {},
+	"gmail.com":      {},
+	"googlemail.com": {},
+	"outlook.com":    {},
+	"hotmail.com":    {},
+	"live.com":       {},
+	"yahoo.com":      {},
+	"icloud.com":     {},
+	"me.com":         {},
+	"proton.me":      {},
+	"protonmail.com": {},
 }
 
-// validateEmail checks a DMARC rua= mailbox. Empty is allowed (policy-only).
-func validateEmail(addr string) error {
+// Email checks a DMARC rua= mailbox. Empty is allowed (policy-only).
+func Email(addr string) error {
 	addr = strings.TrimSpace(addr)
 	if addr == "" {
 		return nil
@@ -132,8 +129,8 @@ func validateEmail(addr string) error {
 		return fmt.Errorf("enter a valid email address")
 	}
 	local := addr[:at]
-	domain := normalizeDomain(addr[at+1:])
-	if err := validateDomain(domain); err != nil {
+	domain := NormalizeDomain(addr[at+1:])
+	if err := Domain(domain); err != nil {
 		return fmt.Errorf("email domain is invalid: %w", err)
 	}
 	for _, r := range local {

internal/web/validate/validate_email_test.go

@@ -0,0 +1,18 @@
+package validate
+
+import "testing"
+
+func TestValidateEmail(t *testing.T) {
+	if err := Email(""); err != nil {
+		t.Errorf("empty: %v", err)
+	}
+	if err := Email("reports@mail.example.com"); err != nil {
+		t.Errorf("valid: %v", err)
+	}
+	if err := Email("bad"); err == nil {
+		t.Error("bad address accepted")
+	}
+	if err := Email("x@gmail.com"); err == nil {
+		t.Error("gmail accepted")
+	}
+}

internal/web/validate/validate_test.go

@@ -0,0 +1,67 @@
+package validate
+
+import "testing"
+
+func TestNormalizeDomain(t *testing.T) {
+	cases := map[string]string{
+		"  Example.COM ":   "example.com",
+		"MAIL.Example.Org": "mail.example.org",
+		"example.com":      "example.com",
+	}
+	for in, want := range cases {
+		if got := NormalizeDomain(in); got != want {
+			t.Errorf("NormalizeDomain(%q) = %q, want %q", in, got, want)
+		}
+	}
+}
+
+func TestValidateDomainValid(t *testing.T) {
+	valid := []string{
+		"example.com",
+		"mail.example.com",
+		"a.co",
+		"sub-domain.example.co.uk",
+		"x1.y2.z3",
+		"1example.com",
+	}
+	for _, d := range valid {
+		if err := Domain(d); err != nil {
+			t.Errorf("Domain(%q) unexpected error: %v", d, err)
+		}
+	}
+}
+
+func TestValidateDomainInvalid(t *testing.T) {
+	invalid := []string{
+		"",
+		"localhost",
+		"example",
+		".example.com",
+		"example.com.",
+		"exa mple.com",
+		"example..com",
+		"-example.com",
+		"example-.com",
+		"example.com\n",
+		"exa*mple.com",
+		"exa_mple.com",
+		"Example.com",
+		"пример.рф",
+		"example.c/m",
+	}
+	for _, d := range invalid {
+		if err := Domain(d); err == nil {
+			t.Errorf("Domain(%q) = nil, want error", d)
+		}
+	}
+}
+
+func TestValidateDomainLongLabelRejected(t *testing.T) {
+	label := make([]byte, 64)
+	for i := range label {
+		label[i] = 'a'
+	}
+	if err := Domain(string(label) + ".com"); err == nil {
+		t.Error("expected error for over-long label")
+	}
+}

internal/web/validate_email_test.go

@@ -1,18 +0,0 @@
-package web
-
-import "testing"
-
-func TestValidateEmail(t *testing.T) {
-	if err := validateEmail(""); err != nil {
-		t.Errorf("empty: %v", err)
-	}
-	if err := validateEmail("reports@mail.example.com"); err != nil {
-		t.Errorf("valid: %v", err)
-	}
-	if err := validateEmail("bad"); err == nil {
-		t.Error("bad address accepted")
-	}
-	if err := validateEmail("x@gmail.com"); err == nil {
-		t.Error("gmail accepted")
-	}
-}

internal/web/validate_test.go

@@ -1,67 +0,0 @@
-package web
-
-import "testing"
-
-func TestNormalizeDomain(t *testing.T) {
-	cases := map[string]string{
-		"  Example.COM ":   "example.com",
-		"MAIL.Example.Org": "mail.example.org",
-		"example.com":      "example.com",
-	}
-	for in, want := range cases {
-		if got := normalizeDomain(in); got != want {
-			t.Errorf("normalizeDomain(%q) = %q, want %q", in, got, want)
-		}
-	}
-}
-
-func TestValidateDomainValid(t *testing.T) {
-	valid := []string{
-		"example.com",
-		"mail.example.com",
-		"a.co",
-		"sub-domain.example.co.uk",
-		"x1.y2.z3",
-		"1example.com",
-	}
-	for _, d := range valid {
-		if err := validateDomain(d); err != nil {
-			t.Errorf("validateDomain(%q) unexpected error: %v", d, err)
-		}
-	}
-}
-
-func TestValidateDomainInvalid(t *testing.T) {
-	invalid := []string{
-		"",              // empty
-		"localhost",     // single label
-		"example",       // single label
-		".example.com",  // leading dot -> empty label
-		"example.com.",  // trailing dot -> empty label
-		"exa mple.com",  // space
-		"example..com",  // empty label
-		"-example.com",  // label starts with '-'
-		"example-.com",  // label ends with '-'
-		"example.com\n", // newline (config injection attempt)
-		"exa*mple.com",  // disallowed char
-		"exa_mple.com",  // underscore not allowed in domains
-		"Example.com",   // upper-case (must be normalised first)
-		"пример.рф",     // non-ASCII
-		"example.c/m",   // slash (path-traversal attempt)
-	}
-	for _, d := range invalid {
-		if err := validateDomain(d); err == nil {
-			t.Errorf("validateDomain(%q) = nil, want error", d)
-		}
-	}
-}
-
-func TestValidateDomainLongLabelRejected(t *testing.T) {
-	label := make([]byte, 64)
-	for i := range label {
-		label[i] = 'a'
-	}
-	if err := validateDomain(string(label) + ".com"); err == nil {
-		t.Error("expected error for over-long label")
-	}
-}

internal/web/view/static.go

@@ -1,4 +1,4 @@
-package web
+package view
 
 import (
 	"crypto/sha256"
@@ -39,7 +39,7 @@ func buildStaticETags() map[string]string {
 	return etags
 }
 
-// staticHandler serves the embedded assets under /static/ with a content ETag.
+// StaticHandler serves the embedded assets under /static/ with a content ETag.
 //
 // Cache-Control is no-cache rather than a max-age: it lets the browser keep the
 // copy but requires it to revalidate, so an asset that changed is picked up on
@@ -47,7 +47,7 @@ func buildStaticETags() map[string]string {
 // handful of small files on a single-operator panel that trade is the right way
 // round — correctness after a deploy matters more than saving the round trip.
 // http.ServeContent answers the conditional request from the ETag we set here.
-func staticHandler() http.Handler {
+func StaticHandler() http.Handler {
 	files := http.FileServer(http.FS(assetsFS))
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if etag, ok := staticETags[path.Clean(r.URL.Path)]; ok {

internal/web/view/static_test.go

@@ -1,4 +1,4 @@
-package web
+package view
 
 import (
 	"net/http"
@@ -13,7 +13,7 @@ func serveStatic(path string, headers map[string]string) *httptest.ResponseRecor
 		r.Header.Set(k, v)
 	}
 	rec := httptest.NewRecorder()
-	staticHandler().ServeHTTP(rec, r)
+	StaticHandler().ServeHTTP(rec, r)
 	return rec
 }
 

internal/web/view/templates_test.go

@@ -1,4 +1,4 @@
-package web
+package view
 
 import (
 	"bytes"
@@ -18,11 +18,11 @@ import (
 // every page template must resolve it. This is what makes "the nav is on every
 // authenticated page" a structural property instead of a checklist item.
 func TestEveryPageResolvesNav(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
-	for name, page := range tmpl.pages {
+	for name, page := range engine.Pages() {
 		if page.Lookup("nav") == nil {
 			t.Errorf("page %q does not resolve the shared nav template", name)
 		}
@@ -37,16 +37,16 @@ func TestEveryPageResolvesNav(t *testing.T) {
 // asserted here: the long pages produce a list, and a page that defines nothing
 // produces nothing at all.
 func TestSectionIndexIsOnTheLongPagesOnly(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	// Anchors the index links to, taken from the page's own cards.
 	wantAnchors := map[string]string{
 		"status":        `href="#certificate"`,
 		"domain_detail": `href="#danger"`,
 	}
-	for name, page := range tmpl.pages {
+	for name, page := range engine.Pages() {
 		var buf bytes.Buffer
 		// The domain page's index hides the freshly generated credential entry
 		// unless one is on the page, so the data map carries the key it reads.
@@ -68,15 +68,15 @@ func TestSectionIndexIsOnTheLongPagesOnly(t *testing.T) {
 // nothing about rendering the page says so. Every anchor the index offers must
 // name an element the same page defines an id for.
 func TestSectionLinksPointAtCardsThatExist(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	// The pages that carry an index; both are checked with a credential shown,
 	// which is the domain page's one conditional entry.
 	for _, name := range []string{"status", "domain_detail"} {
 		var index bytes.Buffer
-		if err := tmpl.pages[name].ExecuteTemplate(&index, "sections", map[string]any{"NewCred": true}); err != nil {
+		if err := engine.Page(name).ExecuteTemplate(&index, "sections", map[string]any{"NewCred": true}); err != nil {
 			t.Fatalf("execute sections for %q: %v", name, err)
 		}
 		// The cards are spread over the page's template files, so the ids are
@@ -108,9 +108,9 @@ func TestSectionLinksPointAtCardsThatExist(t *testing.T) {
 // Appropriate Legal Notices (copyright, licence, source, no warranty) must
 // appear on every page, including the signed-out ones.
 func TestLayoutShowsTheVersionOnlyWhenSignedIn(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("9.9.9-test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	legalBits := []string{
 		"Copyright © 2026 Mikhail Yenuchenko",
@@ -121,9 +121,9 @@ func TestLayoutShowsTheVersionOnlyWhenSignedIn(t *testing.T) {
 		"No warranty",
 	}
 	rendered := 0
-	for name := range tmpl.pages {
+	for name := range engine.Pages() {
 		var buf bytes.Buffer
-		err := tmpl.pages[name].ExecuteTemplate(&buf, "layout.html", map[string]any{
+		err := engine.Page(name).ExecuteTemplate(&buf, "layout.html", map[string]any{
 			"Title": "t", "User": "admin", "Active": "", "Version": "9.9.9-test",
 			"Copyright": "Copyright © 2026 Mikhail Yenuchenko",
 			"SourceURL": "https://github.com/mixeme/selfpost",
@@ -152,7 +152,7 @@ func TestLayoutShowsTheVersionOnlyWhenSignedIn(t *testing.T) {
 	// Signed out (login, setup) the version must not be advertised, but the
 	// Appropriate Legal Notices must still be present.
 	var buf bytes.Buffer
-	if err := tmpl.pages["login"].ExecuteTemplate(&buf, "layout.html", map[string]any{
+	if err := engine.Page("login").ExecuteTemplate(&buf, "layout.html", map[string]any{
 		"Title": "t", "Active": "", "Version": "9.9.9-test",
 		"Copyright": "Copyright © 2026 Mikhail Yenuchenko",
 		"SourceURL": "https://github.com/mixeme/selfpost",
@@ -171,14 +171,13 @@ func TestLayoutShowsTheVersionOnlyWhenSignedIn(t *testing.T) {
 }
 
 func TestRenderSuppliesTheVersion(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("9.9.9-test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
-	s := &Server{tmpl: tmpl, cfg: Config{Version: "9.9.9-test"}}
 	rec := httptest.NewRecorder()
 	data := map[string]any{"Title": "t", "User": "admin"}
-	s.render(rec, http.StatusOK, "backup", data)
+	engine.Render(rec, http.StatusOK, "backup", data)
 
 	if rec.Code != http.StatusOK {
 		t.Fatalf("status = %d, want 200", rec.Code)
@@ -202,12 +201,12 @@ func TestRenderSuppliesTheVersion(t *testing.T) {
 }
 
 func TestNavMarksActivePage(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	var buf bytes.Buffer
-	err = tmpl.pages["dashboard"].ExecuteTemplate(&buf, "nav", map[string]any{
+	err = engine.Page("dashboard").ExecuteTemplate(&buf, "nav", map[string]any{
 		"User":   "admin",
 		"Active": "mail_queue",
 	})
@@ -229,12 +228,12 @@ func TestNavMarksActivePage(t *testing.T) {
 }
 
 func TestNavLeadsWithStatusAndPointsDomainsAtItsOwnPath(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	var buf bytes.Buffer
-	if err := tmpl.pages["status"].ExecuteTemplate(&buf, "nav", map[string]any{
+	if err := engine.Page("status").ExecuteTemplate(&buf, "nav", map[string]any{
 		"User":   "admin",
 		"Active": "status",
 	}); err != nil {
@@ -258,12 +257,12 @@ func TestNavLeadsWithStatusAndPointsDomainsAtItsOwnPath(t *testing.T) {
 // silently comes back at the measure, with its table squeezed into two thirds
 // of the column — so the set is asserted here, in both directions.
 func TestOnlyThePagesMadeOfDataDeclareThemselvesWide(t *testing.T) {
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	wide := map[string]bool{"deliveries": true, "delivery": true, "mail_queue": true, "system_log": true}
-	for name, page := range tmpl.pages {
+	for name, page := range engine.Pages() {
 		var buf bytes.Buffer
 		if err := page.ExecuteTemplate(&buf, "wide", nil); err != nil {
 			t.Fatalf("execute the wide block of %s: %v", name, err)
@@ -394,12 +393,12 @@ func TestStatusPageWithoutMachineMetrics(t *testing.T) {
 
 func renderStatusPage(t *testing.T, data map[string]any) string {
 	t.Helper()
-	tmpl, err := loadTemplates()
+	engine, err := New("test")
 	if err != nil {
-		t.Fatalf("loadTemplates: %v", err)
+		t.Fatalf("New: %v", err)
 	}
 	var buf bytes.Buffer
-	if err := tmpl.pages["status"].ExecuteTemplate(&buf, "layout.html", data); err != nil {
+	if err := engine.Page("status").ExecuteTemplate(&buf, "layout.html", data); err != nil {
 		t.Fatalf("execute status page: %v", err)
 	}
 	return buf.String()
@@ -460,7 +459,7 @@ func statusPageData() map[string]any {
 }
 
 // dnscheckResult mirrors dnscheck.Result's shape for the template test, so the
-// web package's template tests do not depend on the checker's constructor.
+// view package's template tests do not depend on the checker's constructor.
 type dnscheckResult struct {
 	Status  health.Status
 	Detail  string

internal/web/view/view.go

@@ -1,24 +1,26 @@
-package web
+// Package view embeds the panel's HTML templates and static assets and renders
+// pages and HTMX polling fragments.
+package view
 
 import (
 	"bytes"
+	"embed"
 	"fmt"
 	"html/template"
+	"log"
 	"net/http"
 
 	"github.com/mixeme/selfpost/internal/legal"
 )
 
-// templates holds the parsed page and fragment templates. Each page is parsed
-// together with the shared base layout so {{ template "base" . }} works.
-// Fragments (HTMX polling targets, architecture.md § Panel HTTP surface) are
-// parsed standalone, without the layout, so they can be swapped into an
-// existing page as an HTML snippet rather than a full document. Rendering
-// always goes through html/template, which auto-escapes all interpolated data
-// regardless (security.md).
-type templates struct {
+//go:embed templates/*.html static/*
+var assetsFS embed.FS
+
+// Engine holds parsed page and fragment templates.
+type Engine struct {
 	pages     map[string]*template.Template
 	fragments map[string]*template.Template
+	version   string
 }
 
 // pageFiles maps a logical page name to its template files. Every page
@@ -52,10 +54,12 @@ var fragmentFiles = map[string]string{
 	"status_body":     "templates/status_body.html",
 }
 
-func loadTemplates() (*templates, error) {
-	t := &templates{
+// New parses embedded templates. version is stamped into every page footer.
+func New(version string) (*Engine, error) {
+	e := &Engine{
 		pages:     make(map[string]*template.Template),
 		fragments: make(map[string]*template.Template),
+		version:   version,
 	}
 	for name, files := range pageFiles {
 		patterns := append([]string{"templates/layout.html"}, files...)
@@ -63,22 +67,33 @@ func loadTemplates() (*templates, error) {
 		if err != nil {
 			return nil, fmt.Errorf("parse template %s: %w", name, err)
 		}
-		t.pages[name] = tmpl
+		e.pages[name] = tmpl
 	}
 	for name, file := range fragmentFiles {
 		tmpl, err := template.ParseFS(assetsFS, file)
 		if err != nil {
 			return nil, fmt.Errorf("parse fragment %s: %w", name, err)
 		}
-		t.fragments[name] = tmpl
+		e.fragments[name] = tmpl
 	}
-	return t, nil
+	return e, nil
 }
 
-// render writes a page using the base layout. Rendering to a buffer first means
+// Page returns a parsed page template by logical name. It is exported for
+// template guard tests that assert structural properties across all pages.
+func (e *Engine) Page(name string) *template.Template {
+	return e.pages[name]
+}
+
+// Pages returns all parsed page templates keyed by logical name.
+func (e *Engine) Pages() map[string]*template.Template {
+	return e.pages
+}
+
+// Render writes a page using the base layout. Rendering to a buffer first means
 // a template error yields a clean 500 instead of a half-written page.
-func (s *Server) render(w http.ResponseWriter, status int, page string, data any) {
-	tmpl, ok := s.tmpl.pages[page]
+func (e *Engine) Render(w http.ResponseWriter, status int, page string, data any) {
+	tmpl, ok := e.pages[page]
 	if !ok {
 		http.Error(w, "template not found", http.StatusInternalServerError)
 		return
@@ -92,13 +107,13 @@ func (s *Server) render(w http.ResponseWriter, status int, page string, data any
 		if _, has := m["Active"]; !has {
 			m["Active"] = ""
 		}
-		m["Version"] = s.cfg.Version
+		m["Version"] = e.version
 		m["Copyright"] = legal.CopyrightLine
 		m["SourceURL"] = legal.SourceURL
 	}
 	var buf bytes.Buffer
 	if err := tmpl.ExecuteTemplate(&buf, "layout.html", data); err != nil {
-		logf("panel: render %s: %v", page, err)
+		log.Printf("panel: render %s: %v", page, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
@@ -107,18 +122,18 @@ func (s *Server) render(w http.ResponseWriter, status int, page string, data any
 	_, _ = buf.WriteTo(w)
 }
 
-// renderFragment writes an HTMX polling fragment as a bare HTML snippet, with
+// RenderFragment writes an HTMX polling fragment as a bare HTML snippet, with
 // no surrounding layout (architecture.md § Panel HTTP surface: fragment
 // endpoints return HTML, not JSON).
-func (s *Server) renderFragment(w http.ResponseWriter, status int, name string, data any) {
-	tmpl, ok := s.tmpl.fragments[name]
+func (e *Engine) RenderFragment(w http.ResponseWriter, status int, name string, data any) {
+	tmpl, ok := e.fragments[name]
 	if !ok {
 		http.Error(w, "template not found", http.StatusInternalServerError)
 		return
 	}
 	var buf bytes.Buffer
 	if err := tmpl.ExecuteTemplate(&buf, name, data); err != nil {
-		logf("panel: render fragment %s: %v", name, err)
+		log.Printf("panel: render fragment %s: %v", name, err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}

internal/web/web.go

@@ -4,27 +4,25 @@
 package web
 
 import (
-	"embed"
 	"log"
 	"net"
 	"net/http"
-	"strings"
-	"time"
 
 	"github.com/mixeme/selfpost/internal/app"
 	"github.com/mixeme/selfpost/internal/dnscheck"
 	"github.com/mixeme/selfpost/internal/domain"
 	"github.com/mixeme/selfpost/internal/health"
+	"github.com/mixeme/selfpost/internal/legal"
 	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
+	"github.com/mixeme/selfpost/internal/web/handlers"
+	"github.com/mixeme/selfpost/internal/web/view"
 )
 
-//go:embed templates/*.html static/*
-var assetsFS embed.FS
-
 // Config holds the panel's HTTP-facing configuration.
 type Config struct {
 	// Hostname is the server's external hostname, used to build the absolute
-	// setup link shown in the logs (security.md; guide В§ Environment
+	// setup link shown in the logs (security.md; guide § Environment
 	// variables for SELFPOST_HOSTNAME).
 	Hostname string
 	// CookieSecure sets the Secure attribute on the session cookie. It defaults
@@ -33,16 +31,16 @@ type Config struct {
 	CookieSecure bool
 	// SubmissionEnabled mirrors SUBMISSION_ENABLE: whether this deployment also
 	// runs the 587/STARTTLS submission listener next to the primary 465 one
-	// (architecture.md В§ Mail path). The panel only reports it on the domain
+	// (architecture.md § Mail path). The panel only reports it on the domain
 	// page's connection settings; it is a deploy-time flag, not something the
 	// panel can verify.
 	SubmissionEnabled bool
 	// MailLogPath is where Postfix's delivery log lives, read by the mail.log
-	// monitoring view (architecture.md В§ Panel HTTP surface). It is the same path
+	// monitoring view (architecture.md § Panel HTTP surface). It is the same path
 	// the log-tailer role follows in cmd/panel.
 	MailLogPath string
 	// DataDir and DBPath locate the persistent state a full backup archives
-	// (architecture.md В§ Persistence); Version is stamped into the backup
+	// (architecture.md § Persistence); Version is stamped into the backup
 	// manifest. They mirror the panel's own configuration.
 	DataDir string
 	DBPath  string
@@ -53,7 +51,7 @@ type Config struct {
 	// honoured, so the header can't be spoofed by anyone but a trusted proxy.
 	// Empty (the default) keeps rate-limiting keyed on RemoteAddr only.
 	TrustedProxyCIDRs []*net.IPNet
-	// TLSCertFile is the certificate Postfix serves on 465/587 (guide В§
+	// TLSCertFile is the certificate Postfix serves on 465/587 (guide §
 	// Environment variables), read read-only by the status page to report how
 	// much validity is left.
 	TLSCertFile string
@@ -69,156 +67,107 @@ type Config struct {
 	SessionIdleDays int
 	// DNSResolvers are the recursive resolvers the deliverability checks query
 	// (env SELFPOST_DNS_RESOLVERS). Empty uses dnscheck.DefaultResolvers. The
-	// checks must not go through the system resolver — see dnscheck's
-	// externalResolver — so this is how a closed network points them at its own.
+	// checks must not go through the system resolver — see dnscheck's
+	// externalResolver — so this is how a closed network points them at its own.
 	DNSResolvers []string
 }
 
 // Server is the panel HTTP application.
 type Server struct {
-	store    *store.Store
-	domains  *domain.Service
-	apps     *app.Service
 	cfg      Config
-	tmpl     *templates
-	sessions *sessionStore
-	setup    *setupManager
-	dns      *dnscheck.Checker
-	// machine reads the host's CPU, memory and network counters for the
-	// status page. It has to be one shared sampler for the whole server:
-	// CPU and throughput are differences between successive readings, so a
-	// per-request sampler would never have a previous one to subtract.
-	machine health.MachineSampler
-
-	loginLimiter *rateLimiter
-	setupLimiter *rateLimiter
-
-	trustedProxies []*net.IPNet
+	auth     *auth.Module
+	handlers *handlers.Handlers
 }
 
 // New builds the panel server. setupTokenPath is where the current setup token
 // is mirrored on disk (security.md); domains is the sending-domain service
-// that owns DKIM keys and the OpenDKIM tables (architecture.md В§ OpenDKIM);
+// that owns DKIM keys and the OpenDKIM tables (architecture.md § OpenDKIM);
 // apps owns application SASL accounts and the Postfix sender map
-// (architecture.md В§ Mail path).
+// (architecture.md § Mail path).
 func New(st *store.Store, domains *domain.Service, apps *app.Service, cfg Config, setupTokenPath string) (*Server, error) {
-	tmpl, err := loadTemplates()
+	v, err := view.New(cfg.Version)
 	if err != nil {
 		return nil, err
 	}
-	idleDays := cfg.SessionIdleDays
-	if idleDays <= 0 {
-		idleDays = 7
-	}
-	s := &Server{
-		store:    st,
-		domains:  domains,
-		apps:     apps,
-		cfg:      cfg,
-		tmpl:     tmpl,
-		sessions: newSessionStore(st, time.Duration(idleDays)*24*time.Hour),
-		// Published-DNS checks for the status page and the domain pages. The
-		// checker caches its own results, so page views do not each pay for a
-		// round of lookups.
-		dns: dnscheck.New(cfg.DNSResolvers),
-		// Setup: a handful of attempts per minute per IP is plenty for a
-		// legitimate admin and blunts automated probing (security.md).
-		setupLimiter: newRateLimiter(10, time.Minute),
-		// Login: throttle brute-force by IP (security.md).
-		loginLimiter: newRateLimiter(10, 15*time.Minute),
-
-		trustedProxies: cfg.TrustedProxyCIDRs,
-	}
-	s.setup = newSetupManager(st, cfg.Hostname, setupTokenPath)
-	return s, nil
+	a := auth.New(st, auth.Config{
+		CookieSecure:      cfg.CookieSecure,
+		Hostname:          cfg.Hostname,
+		SessionIdleDays:   cfg.SessionIdleDays,
+		TrustedProxyCIDRs: cfg.TrustedProxyCIDRs,
+	}, v, setupTokenPath)
+	h := handlers.New(st, domains, apps, handlers.Config{
+		Hostname:          cfg.Hostname,
+		SubmissionEnabled: cfg.SubmissionEnabled,
+		MailLogPath:       cfg.MailLogPath,
+		DataDir:           cfg.DataDir,
+		DBPath:            cfg.DBPath,
+		Version:           cfg.Version,
+		TLSCertFile:       cfg.TLSCertFile,
+		OpenDKIMSocket:    cfg.OpenDKIMSocket,
+		JournalSocket:     cfg.JournalSocket,
+	}, v, dnscheck.New(cfg.DNSResolvers), &health.MachineSampler{}, a)
+	return &Server{cfg: cfg, auth: a, handlers: h}, nil
 }
 
 // Start performs first-run bootstrapping: if there is no administrator yet, it
 // generates and announces the setup link (security.md). Safe to call once at
 // server startup.
 func (s *Server) Start() error {
-	return s.setup.bootstrap()
+	return s.auth.Bootstrap()
 }
 
 // Handler returns the panel's HTTP handler (router).
 func (s *Server) Handler() http.Handler {
 	mux := http.NewServeMux()
+	h := s.handlers
 
-	// Health check stays unauthenticated for the container/orchestrator.
 	mux.HandleFunc("/healthz", handleHealth)
+	mux.HandleFunc("/license", handleLicense)
+	mux.Handle("/static/", view.StaticHandler())
+	mux.HandleFunc("/setup/", s.auth.HandleSetup)
+	mux.HandleFunc("/login", s.auth.HandleLogin)
+	mux.HandleFunc("/logout", s.auth.HandleLogout)
 
-	// AGPL Appropriate Legal Notices: the licence text itself, reachable
-	// without a session so the login and setup footers can link to it.
-	mux.HandleFunc("/license", s.handleLicense)
-
-	// Vendored static assets (HTMX). Served from the embedded FS, with a
-	// content ETag so a replaced asset survives the browser cache (static.go).
-	mux.Handle("/static/", staticHandler())
-
-	// One-time administrator setup (security.md).
-	mux.HandleFunc("/setup/", s.handleSetup)
-
-	// Authentication.
-	mux.HandleFunc("/login", s.handleLogin)
-	mux.HandleFunc("/logout", s.handleLogout)
-
-	// Authenticated panel. Everything not matched by a more specific pattern
-	// above falls through to this sub-mux, wrapped once in the auth middleware.
 	authed := http.NewServeMux()
-
-	// The landing page is the server status: the first thing an
-	// administrator should see after logging in is whether the service is
-	// healthy, not the domain list. handleLogin still redirects to "/".
 	authed.HandleFunc("GET /{$}", redirectToStatus)
-	authed.HandleFunc("GET /status", s.handleStatus)
-	authed.HandleFunc("GET /status/fragment", s.handleStatusFragment)
-	authed.HandleFunc("POST /status/recheck", s.handleStatusRecheck)
+	authed.HandleFunc("GET /status", h.HandleStatus)
+	authed.HandleFunc("GET /status/fragment", h.HandleStatusFragment)
+	authed.HandleFunc("POST /status/recheck", h.HandleStatusRecheck)
 
-	authed.HandleFunc("GET /domains", s.handleDashboard)
-	authed.HandleFunc("POST /domains", s.handleAddDomain)
-	authed.HandleFunc("POST /domains/import", s.handleImportDomain)
-	authed.HandleFunc("GET /domains/{id}", s.handleDomainDetail)
-	authed.HandleFunc("POST /domains/{id}/dns-recheck", s.handleDomainDNSRecheck)
-	authed.HandleFunc("GET /domains/{id}/delete", s.handleDeleteConfirm)
-	authed.HandleFunc("POST /domains/{id}/delete", s.handleDeleteDomain)
-	authed.HandleFunc("POST /domains/{id}/applications", s.handleAddApplication)
-	authed.HandleFunc("POST /domains/{id}/ratelimit", s.handleDomainRateLimit)
-	authed.HandleFunc("POST /domains/{id}/dmarc", s.handleDomainDMARC)
-	authed.HandleFunc("POST /domains/{id}/export", s.handleExportDomain)
-	authed.HandleFunc("POST /applications/{aid}/mode", s.handleUpdateAppMode)
-	authed.HandleFunc("POST /applications/{aid}/password", s.handleRegenPassword)
-	authed.HandleFunc("POST /applications/{aid}/ratelimit", s.handleAppRateLimit)
-	authed.HandleFunc("POST /applications/{aid}/delete", s.handleDeleteApplication)
-	authed.HandleFunc("POST /reload", s.handleReload)
+	authed.HandleFunc("GET /domains", h.HandleDashboard)
+	authed.HandleFunc("POST /domains", h.HandleAddDomain)
+	authed.HandleFunc("POST /domains/import", h.HandleImportDomain)
+	authed.HandleFunc("GET /domains/{id}", h.HandleDomainDetail)
+	authed.HandleFunc("POST /domains/{id}/dns-recheck", h.HandleDomainDNSRecheck)
+	authed.HandleFunc("GET /domains/{id}/delete", h.HandleDeleteConfirm)
+	authed.HandleFunc("POST /domains/{id}/delete", h.HandleDeleteDomain)
+	authed.HandleFunc("POST /domains/{id}/applications", h.HandleAddApplication)
+	authed.HandleFunc("POST /domains/{id}/ratelimit", h.HandleDomainRateLimit)
+	authed.HandleFunc("POST /domains/{id}/dmarc", h.HandleDomainDMARC)
+	authed.HandleFunc("POST /domains/{id}/export", h.HandleExportDomain)
+	authed.HandleFunc("POST /applications/{aid}/mode", h.HandleUpdateAppMode)
+	authed.HandleFunc("POST /applications/{aid}/password", h.HandleRegenPassword)
+	authed.HandleFunc("POST /applications/{aid}/ratelimit", h.HandleAppRateLimit)
+	authed.HandleFunc("POST /applications/{aid}/delete", h.HandleDeleteApplication)
+	authed.HandleFunc("POST /reload", h.HandleReload)
 
-	// Administrator's own panel credentials.
-	authed.HandleFunc("/account", s.handleAccount)
+	authed.HandleFunc("/account", h.HandleAccount)
 
-	// Backup and migration: the page with both actions (architecture.md В§
-	// Persistence-B), and the full-server backup download itself.
-	authed.HandleFunc("GET /backup", s.handleBackupPage)
-	authed.HandleFunc("POST /backup", s.handleBackup)
+	authed.HandleFunc("GET /backup", h.HandleBackupPage)
+	authed.HandleFunc("POST /backup", h.HandleBackup)
 
-	// Monitoring screens (architecture.md В§ Panel HTTP surface): each page and
-	// its HTMX polling fragment (architecture.md § Panel HTTP surface — the /rows
-	// and /body endpoints return HTML, not JSON).
-	authed.HandleFunc("GET /deliveries", s.handleDeliveries)
-	authed.HandleFunc("GET /deliveries/rows", s.handleDeliveriesRows)
-	authed.HandleFunc("GET /deliveries/{id}", s.handleDelivery)
-	authed.HandleFunc("GET /mail-queue", s.handleMailQueue)
-	authed.HandleFunc("GET /mail-queue/body", s.handleMailQueueBody)
-	authed.HandleFunc("GET /system-log", s.handleSystemLog)
-	authed.HandleFunc("GET /system-log/body", s.handleSystemLogBody)
+	authed.HandleFunc("GET /deliveries", h.HandleDeliveries)
+	authed.HandleFunc("GET /deliveries/rows", h.HandleDeliveriesRows)
+	authed.HandleFunc("GET /deliveries/{id}", h.HandleDelivery)
+	authed.HandleFunc("GET /mail-queue", h.HandleMailQueue)
+	authed.HandleFunc("GET /mail-queue/body", h.HandleMailQueueBody)
+	authed.HandleFunc("GET /system-log", h.HandleSystemLog)
+	authed.HandleFunc("GET /system-log/body", h.HandleSystemLogBody)
 
-	mux.Handle("/", s.requireAuth(authed))
-
-	// Security headers and the origin check wrap everything, including the
-	// unauthenticated login and setup routes.
+	mux.Handle("/", s.auth.RequireAuth(authed))
 	return s.secure(mux)
 }
 
-// redirectToStatus points the panel root at the status page, so there is one
-// canonical URL for that content instead of two.
 func redirectToStatus(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, "/status", http.StatusSeeOther)
 }
@@ -233,44 +182,20 @@ func handleHealth(w http.ResponseWriter, _ *http.Request) {
 	_, _ = w.Write([]byte("ok\n"))
 }
 
-// clientIP extracts the peer IP for rate-limiting. By default it is the
-// transport peer (RemoteAddr), which cannot be spoofed. If RemoteAddr matches
-// one of trustedProxies, the last entry of X-Forwarded-For is used instead —
-// that is the address the trusted proxy itself appended, so a client can't
-// forge it by sending its own XFF header. With no trusted
-// proxies configured, behind a reverse proxy this is the proxy's own address,
-// which is an acceptable backstop for a single-admin panel.
-func clientIP(r *http.Request, trustedProxies []*net.IPNet) string {
-	host, _, err := net.SplitHostPort(r.RemoteAddr)
-	if err != nil {
-		host = r.RemoteAddr
+func handleLicense(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet && r.Method != http.MethodHead {
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		return
 	}
-
-	if len(trustedProxies) > 0 {
-		if peer := net.ParseIP(host); peer != nil && ipInAny(peer, trustedProxies) {
-			if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
-				parts := strings.Split(xff, ",")
-				if ip := net.ParseIP(strings.TrimSpace(parts[len(parts)-1])); ip != nil {
-					return ip.String()
-				}
-			}
-		}
+	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	w.WriteHeader(http.StatusOK)
+	if r.Method == http.MethodHead {
+		return
 	}
-
-	return host
+	_, _ = w.Write(legal.License)
 }
 
-func ipInAny(ip net.IP, nets []*net.IPNet) bool {
-	for _, n := range nets {
-		if n.Contains(ip) {
-			return true
-		}
-	}
-	return false
-}
-
-// logf is a thin wrapper so handlers log with a consistent prefix.
 func logf(format string, args ...any) {
 	log.Printf(format, args...)
 }
-