fix(panel): code-review P6 optional cleanup

Close the remaining low-risk items from the full-tree review: rename the settings handler, query assigned domains in SQL, bound the login limiter map, collapse panel.js show/hide helpers, and soften DMARC copy that promised a future in-panel receiver.

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

internal/web/auth/auth.go

@@ -51,6 +51,8 @@ func New(st *store.Store, cfg Config, v *view.Engine, setupTokenPath string) *Mo
 		loginLimiter:   newRateLimiter(10, 15*time.Minute),
 		trustedProxies: cfg.TrustedProxyCIDRs,
 	}
+	m.setupLimiter.startSweeper()
+	m.loginLimiter.startSweeper()
 	m.setup = newSetupManager(st, cfg.Hostname, setupTokenPath)
 	return m
 }

internal/web/auth/middleware.go

@@ -44,15 +44,3 @@ func CurrentUser(r *http.Request) string {
 	}
 	return ""
 }
-
-// RequireGlobal wraps a handler that only global administrators may reach.
-func RequireGlobal(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		p, ok := CurrentPrincipal(r.Context())
-		if !ok || !p.IsGlobal() {
-			http.NotFound(w, r)
-			return
-		}
-		next.ServeHTTP(w, r)
-	})
-}

internal/web/auth/ratelimit.go

@@ -5,11 +5,14 @@ import (
 	"time"
 )
 
+const defaultMaxBuckets = 4096
+
 // rateLimiter is a simple fixed-window per-key counter used to throttle the
 // setup and login routes (security.md). Keys are client IPs.
 type rateLimiter struct {
-	max    int
-	window time.Duration
+	max        int
+	window     time.Duration
+	maxBuckets int
 
 	mu      sync.Mutex
 	buckets map[string]*rlBucket
@@ -22,12 +25,25 @@ type rlBucket struct {
 
 func newRateLimiter(max int, window time.Duration) *rateLimiter {
 	return &rateLimiter{
-		max:     max,
-		window:  window,
-		buckets: make(map[string]*rlBucket),
+		max:        max,
+		window:     window,
+		maxBuckets: defaultMaxBuckets,
+		buckets:    make(map[string]*rlBucket),
 	}
 }
 
+func (r *rateLimiter) startSweeper() {
+	go func() {
+		ticker := time.NewTicker(r.window)
+		defer ticker.Stop()
+		for range ticker.C {
+			r.mu.Lock()
+			r.sweep(time.Now())
+			r.mu.Unlock()
+		}
+	}()
+}
+
 func (r *rateLimiter) Allow(key string) bool {
 	now := time.Now()
 	r.mu.Lock()
@@ -35,6 +51,7 @@ func (r *rateLimiter) Allow(key string) bool {
 
 	b := r.buckets[key]
 	if b == nil || now.After(b.windowEnds) {
+		r.makeRoom(now)
 		r.buckets[key] = &rlBucket{count: 1, windowEnds: now.Add(r.window)}
 		r.sweep(now)
 		return true
@@ -46,6 +63,32 @@ func (r *rateLimiter) Allow(key string) bool {
 	return true
 }
 
+func (r *rateLimiter) makeRoom(now time.Time) {
+	if r.maxBuckets <= 0 || len(r.buckets) < r.maxBuckets {
+		return
+	}
+	r.sweep(now)
+	for len(r.buckets) >= r.maxBuckets {
+		r.evictOldest()
+	}
+}
+
+func (r *rateLimiter) evictOldest() {
+	var oldestKey string
+	var oldestEnds time.Time
+	first := true
+	for k, b := range r.buckets {
+		if first || b.windowEnds.Before(oldestEnds) {
+			oldestKey = k
+			oldestEnds = b.windowEnds
+			first = false
+		}
+	}
+	if oldestKey != "" {
+		delete(r.buckets, oldestKey)
+	}
+}
+
 func (r *rateLimiter) sweep(now time.Time) {
 	for k, b := range r.buckets {
 		if now.After(b.windowEnds) {

internal/web/auth/ratelimit_test.go

@@ -98,3 +98,28 @@ func expire(r *rateLimiter, key string) {
 		b.windowEnds = time.Now().Add(-time.Second)
 	}
 }
+
+// A long-running panel can see many unique client addresses. Finished buckets
+// are swept on every new window, and a hard cap evicts the oldest when the map
+// would otherwise grow without bound.
+func TestRateLimiterCapsBucketCount(t *testing.T) {
+	r := newRateLimiter(1, time.Minute)
+	r.maxBuckets = 3
+
+	for i, key := range []string{"203.0.113.7", "198.51.100.9", "192.0.2.5"} {
+		if !r.Allow(key) {
+			t.Fatalf("attempt %d for %s was refused under the cap", i+1, key)
+		}
+		expire(r, key)
+	}
+
+	if !r.Allow("203.0.113.8") {
+		t.Fatal("a fourth address was refused even though room was made")
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if len(r.buckets) > 3 {
+		t.Fatalf("bucket count = %d, want at most 3", len(r.buckets))
+	}
+}

internal/web/handlers/authz.go

@@ -32,17 +32,7 @@ func (h *Handlers) assignedDomains(p auth.Principal) ([]store.Domain, error) {
 	if p.IsGlobal() {
 		return h.store.ListDomains()
 	}
-	all, err := h.store.ListDomains()
-	if err != nil {
-		return nil, err
-	}
-	var out []store.Domain
-	for _, d := range all {
-		if p.CanAccessDomain(d.ID) {
-			out = append(out, d)
-		}
-	}
-	return out, nil
+	return h.store.ListDomainsForUser(p.ID)
 }
 
 func domainNameSet(domains []store.Domain) map[string]bool {

internal/web/handlers/authz_test.go

@@ -57,7 +57,7 @@ var globalOnlyRoutes = []route{
 // case the send-log leak (P0, code-review.md) showed is easy to get wrong.
 func TestGlobalOnlyRoutesAnswerADomainAdmin404(t *testing.T) {
 	h, domains := serverWithTwoDomains(t)
-	p := domainAdmin(domains["first.example.ru"].ID)
+	p := domainAdmin(t, h.store, "global-only", domains["first.example.ru"].ID)
 
 	for _, rt := range globalOnlyRoutes {
 		rec := call(h, rt, p)

internal/web/handlers/handlers_monitor_test.go

@@ -222,34 +222,41 @@ func TestSendLogScopedToAssignedDomains(t *testing.T) {
 	h, domains := serverWithTwoDomains(t)
 
 	for name, tc := range map[string]struct {
-		principal auth.Principal
+		username  string
+		domainIDs []int64
 		want      []string
 		unwanted  []string
 	}{
 		"global sees both": {
-			globalPrincipal, []string{"First message", "Second message"}, nil,
+			"", nil, []string{"First message", "Second message"}, nil,
 		},
 		"one assigned domain": {
-			domainAdmin(domains["first.example.ru"].ID),
+			"one-domain", []int64{domains["first.example.ru"].ID},
 			[]string{"First message"}, []string{"Second message", "second-app"},
 		},
 		"two assigned domains": {
-			domainAdmin(domains["first.example.ru"].ID, domains["second.example.ru"].ID),
+			"two-domains", []int64{domains["first.example.ru"].ID, domains["second.example.ru"].ID},
 			[]string{"First message", "Second message"}, nil,
 		},
 		// Every assigned domain deleted cascades the assignments away. That
 		// leaves a principal entitled to nothing, which is an empty log — the
 		// case that used to hand over the whole journal.
 		"no assigned domains": {
-			domainAdmin(), []string{"No messages logged yet."},
+			"no-domains", nil, []string{"No messages logged yet."},
 			[]string{"First message", "Second message"},
 		},
 	} {
+		var p auth.Principal
+		if tc.username == "" {
+			p = globalPrincipal
+		} else {
+			p = domainAdmin(t, h.store, tc.username, tc.domainIDs...)
+		}
 		for view, handler := range map[string]http.HandlerFunc{
 			"page":     h.HandleDeliveries,
 			"fragment": h.HandleDeliveriesRows,
 		} {
-			out := getBodyAs(t, handler, "/deliveries", tc.principal)
+			out := getBodyAs(t, handler, "/deliveries", p)
 			for _, want := range tc.want {
 				if !strings.Contains(out, want) {
 					t.Errorf("%s (%s): missing %q:\n%s", name, view, want, out)
@@ -270,7 +277,7 @@ func TestSendLogScopedToAssignedDomains(t *testing.T) {
 // trusted for having been rendered by us.
 func TestSendLogIgnoresForgedFilters(t *testing.T) {
 	h, domains := serverWithTwoDomains(t)
-	p := domainAdmin(domains["first.example.ru"].ID)
+	p := domainAdmin(t, h.store, "forged-filter", domains["first.example.ru"].ID)
 
 	for _, target := range []string{
 		"/deliveries?domain=second.example.ru",
@@ -299,7 +306,7 @@ func TestDeliveryPageForeignDomainNotFound(t *testing.T) {
 	rec := httptest.NewRecorder()
 	req := httptest.NewRequest(http.MethodGet, "/deliveries/"+itoa(rows[0].ID), nil)
 	req.SetPathValue("id", itoa(rows[0].ID))
-	req = auth.RequestWithPrincipal(req, domainAdmin(domains["first.example.ru"].ID))
+	req = auth.RequestWithPrincipal(req, domainAdmin(t, h.store, "foreign-detail", domains["first.example.ru"].ID))
 	h.HandleDelivery(rec, req)
 	if rec.Code != http.StatusNotFound {
 		t.Errorf("delivery page for a foreign domain = %d, want 404", rec.Code)
@@ -343,13 +350,37 @@ func serverWithTwoDomains(t *testing.T) (*Handlers, map[string]store.Domain) {
 
 var globalPrincipal = auth.Principal{ID: 1, Username: "admin", Role: auth.RoleGlobal}
 
-func domainAdmin(domainIDs ...int64) auth.Principal {
-	return auth.Principal{
-		ID:       2,
-		Username: "domain-admin",
-		Role:     auth.RoleDomainAdmin,
-		Domains:  domainIDs,
+func domainAdmin(t *testing.T, st *store.Store, username string, domainIDs ...int64) auth.Principal {
+	t.Helper()
+	const hash = "test-hash"
+	if len(domainIDs) == 0 {
+		placeholder, err := st.AddDomain(username+".placeholder.invalid", "mail")
+		if err != nil {
+			t.Fatalf("add placeholder domain: %v", err)
+		}
+		id, err := st.CreateUser(username, hash, store.RoleDomainAdmin, []int64{placeholder.ID})
+		if err != nil {
+			t.Fatalf("create domain admin %s: %v", username, err)
+		}
+		if err := st.DeleteDomain(placeholder.ID); err != nil {
+			t.Fatalf("delete placeholder domain: %v", err)
+		}
+		domainIDs = nil
+		u, err := st.GetUser(id)
+		if err != nil {
+			t.Fatalf("get domain admin %s: %v", username, err)
+		}
+		return auth.Principal{ID: u.ID, Username: u.Username, Role: u.Role, Domains: u.DomainIDs}
 	}
+	id, err := st.CreateUser(username, hash, store.RoleDomainAdmin, domainIDs)
+	if err != nil {
+		t.Fatalf("create domain admin %s: %v", username, err)
+	}
+	u, err := st.GetUser(id)
+	if err != nil {
+		t.Fatalf("get domain admin %s: %v", username, err)
+	}
+	return auth.Principal{ID: u.ID, Username: u.Username, Role: u.Role, Domains: u.DomainIDs}
 }
 
 // serverWithDelivery builds a panel over a store holding one delivery, written

internal/web/handlers/handlers_settings.go

@@ -14,8 +14,8 @@ import (
 	"golang.org/x/crypto/bcrypt"
 )
 
-// HandleAccount serves the signed-in user's account settings.
-func (h *Handlers) HandleAccount(w http.ResponseWriter, r *http.Request) {
+// HandleSettings serves the signed-in user's panel settings.
+func (h *Handlers) HandleSettings(w http.ResponseWriter, r *http.Request) {
 	switch r.Method {
 	case http.MethodGet:
 		p, ok := h.principal(r)
@@ -25,20 +25,20 @@ func (h *Handlers) HandleAccount(w http.ResponseWriter, r *http.Request) {
 		}
 		u, err := h.store.GetUser(p.ID)
 		if err != nil {
-			logf("panel: account: get user failed: %v", err)
+			logf("panel: settings: get user failed: %v", err)
 			http.Error(w, "internal error", http.StatusInternalServerError)
 			return
 		}
-		h.renderAccount(w, r, http.StatusOK, "", u.Username, u.DMARCReportEmail, p.IsGlobal())
+		h.renderSettings(w, r, http.StatusOK, "", u.Username, u.DMARCReportEmail, p.IsGlobal())
 	case http.MethodPost:
-		h.submitAccount(w, r)
+		h.submitSettings(w, r)
 	default:
 		w.Header().Set("Allow", "GET, POST")
 		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
 	}
 }
 
-func (h *Handlers) renderAccount(w http.ResponseWriter, r *http.Request, status int, formErr, formUsername, formDMARCEmail string, showDMARC bool) {
+func (h *Handlers) renderSettings(w http.ResponseWriter, r *http.Request, status int, formErr, formUsername, formDMARCEmail string, showDMARC bool) {
 	var reportAuth dnscheck.Result
 	if showDMARC && formDMARCEmail != "" {
 		if hub := dnscheck.EmailDomain(formDMARCEmail); hub != "" {
@@ -58,13 +58,13 @@ func (h *Handlers) renderAccount(w http.ResponseWriter, r *http.Request, status
 	data["ReportAuthDNS"] = reportAuth
 	data["ReportAuthHub"] = dnscheck.EmailDomain(formDMARCEmail)
 	data["Error"] = formErr
-	data["Flash"] = accountFlash(r)
+	data["Flash"] = settingsFlash(r)
 	data["L1Messages"] = h.l1Messages()
 	data["L1Window"] = h.l1Window()
 	h.view.Render(w, status, "settings", data)
 }
 
-func accountFlash(r *http.Request) string {
+func settingsFlash(r *http.Request) string {
 	switch r.URL.Query().Get("updated") {
 	case "username":
 		return "Username changed."
@@ -85,16 +85,16 @@ func accountFlash(r *http.Request) string {
 	}
 }
 
-func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
+func (h *Handlers) submitSettings(w http.ResponseWriter, r *http.Request) {
 	if !h.auth.AllowLoginAttempt(r) {
 		p, _ := h.principal(r)
-		h.renderAccount(w, r, http.StatusTooManyRequests,
+		h.renderSettings(w, r, http.StatusTooManyRequests,
 			"Too many attempts. Please wait and try again.", auth.CurrentUser(r), "", p.IsGlobal())
 		return
 	}
 	if err := r.ParseForm(); err != nil {
 		p, _ := h.principal(r)
-		h.renderAccount(w, r, http.StatusBadRequest, "Invalid form submission.", auth.CurrentUser(r), "", p.IsGlobal())
+		h.renderSettings(w, r, http.StatusBadRequest, "Invalid form submission.", auth.CurrentUser(r), "", p.IsGlobal())
 		return
 	}
 
@@ -105,7 +105,7 @@ func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
 	}
 	user, err := h.store.GetUser(p.ID)
 	if err != nil {
-		logf("panel: account: get user failed: %v", err)
+		logf("panel: settings: get user failed: %v", err)
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
 	}
@@ -123,21 +123,21 @@ func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(current)); err != nil {
-		h.renderAccount(w, r, http.StatusUnauthorized, "Current password is incorrect.", username, dmarcEmail, p.IsGlobal())
+		h.renderSettings(w, r, http.StatusUnauthorized, "Current password is incorrect.", username, dmarcEmail, p.IsGlobal())
 		return
 	}
 
 	renaming := username != user.Username
 	if renaming {
 		if err := validate.Username(username); err != nil {
-			h.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail, p.IsGlobal())
+			h.renderSettings(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail, p.IsGlobal())
 			return
 		}
 	}
 
 	if p.IsGlobal() {
 		if err := validate.Email(dmarcEmail); err != nil {
-			h.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail, true)
+			h.renderSettings(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail, true)
 			return
 		}
 	}
@@ -147,16 +147,16 @@ func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
 	repassword := password != "" || confirm != ""
 	if repassword {
 		if password != confirm {
-			h.renderAccount(w, r, http.StatusBadRequest, "New passwords do not match.", username, dmarcEmail, p.IsGlobal())
+			h.renderSettings(w, r, http.StatusBadRequest, "New passwords do not match.", username, dmarcEmail, p.IsGlobal())
 			return
 		}
 		if err := validate.AdminPassword(password); err != nil {
-			h.renderAccount(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail, p.IsGlobal())
+			h.renderSettings(w, r, http.StatusBadRequest, err.Error(), username, dmarcEmail, p.IsGlobal())
 			return
 		}
 	}
 	if !renaming && !repassword && !emailChanging {
-		h.renderAccount(w, r, http.StatusBadRequest,
+		h.renderSettings(w, r, http.StatusBadRequest,
 			"Nothing to change: enter a new username, password, or DMARC report address.", username, dmarcEmail, p.IsGlobal())
 		return
 	}
@@ -165,8 +165,8 @@ func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
 	if repassword {
 		newHash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
 		if err != nil {
-			logf("panel: account: hashing password failed: %v", err)
-			h.renderAccount(w, r, http.StatusInternalServerError,
+			logf("panel: settings: hashing password failed: %v", err)
+			h.renderSettings(w, r, http.StatusInternalServerError,
 				"Internal error. Please try again.", username, dmarcEmail, p.IsGlobal())
 			return
 		}
@@ -174,17 +174,17 @@ func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := h.store.UpdateUser(user.ID, username, hash, dmarcEmail); err != nil {
-		logf("panel: account: update user failed: %v", err)
+		logf("panel: settings: update user failed: %v", err)
 		msg := "Could not save the changes. Please check the logs and try again."
 		if errors.Is(err, store.ErrUserNotFound) {
 			msg = "There is no user account to update."
 		}
 		if errors.Is(err, store.ErrUserExists) {
 			msg = "That username is already in use."
-			h.renderAccount(w, r, http.StatusConflict, msg, username, dmarcEmail, p.IsGlobal())
+			h.renderSettings(w, r, http.StatusConflict, msg, username, dmarcEmail, p.IsGlobal())
 			return
 		}
-		h.renderAccount(w, r, http.StatusInternalServerError, msg, username, dmarcEmail, p.IsGlobal())
+		h.renderSettings(w, r, http.StatusInternalServerError, msg, username, dmarcEmail, p.IsGlobal())
 		return
 	}
 
@@ -197,7 +197,7 @@ func (h *Handlers) submitAccount(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	logf("panel: user %d account updated (username: %t, password: %t, dmarc email: %t)", user.ID, renaming, repassword, emailChanging)
+	logf("panel: user %d settings updated (username: %t, password: %t, dmarc email: %t)", user.ID, renaming, repassword, emailChanging)
 	http.Redirect(w, r, "/settings?updated="+updatedFlag(renaming, repassword, emailChanging), http.StatusSeeOther)
 }
 

internal/web/view/static/panel.js

@@ -46,145 +46,81 @@
     }
   });
 
-  // --- Address list shown only in list mode -----------------------------
-  // The "Addresses" field applies to list mode only; in wildcard mode the
-  // server ignores it, so hiding it removes a field that does nothing. The
-  // toggle runs on load too, because the edit form of an existing application
-  // may already be set to list mode.
-  function syncAddressField(select) {
-    var form = select.closest("form");
-    var field = form && form.querySelector("[data-addresses]");
-    if (!field) {
+  // --- Conditional field visibility ------------------------------------
+  // Several forms hide a block until a select, checkbox or file input says it
+  // applies. One rule table drives them all so the five near-identical helpers
+  // do not drift.
+  var showWhenRules = [
+    {
+      match: "select[data-list-mode]",
+      target: "[data-addresses]",
+      visible: function (el) { return el.value === el.dataset.listMode; }
+    },
+    {
+      match: "select[data-custom-mode]",
+      target: "[data-custom-address]",
+      visible: function (el) { return el.value === el.dataset.customMode; }
+    },
+    {
+      match: "select[data-global-role]",
+      target: "[data-domain-pick]",
+      visible: function (el) { return el.value !== el.dataset.globalRole; }
+    },
+    {
+      match: "input[data-encrypt-toggle]",
+      target: "[data-encrypt-fields]",
+      visible: function (el) { return el.checked; },
+      clearWhenHidden: true
+    },
+    {
+      match: "input[data-import-file]",
+      target: "[data-import-password-fields]",
+      visible: function (el) {
+        var name = (el.files && el.files[0] && el.files[0].name || "").toLowerCase();
+        return name !== "" && !/\.json$/.test(name);
+      },
+      clearWhenHidden: true
+    }
+  ];
+
+  function syncShowWhen(control) {
+    var form = control.closest("form");
+    if (!form) {
       return;
     }
-    // The mode values come from the server (store.AddressModeList), so the
-    // select carries the one that means "list" rather than this script
-    // hard-coding it.
-    field.hidden = select.value !== select.dataset.listMode;
-  }
-
-  function initAddressFields(root) {
-    root.querySelectorAll("select[data-list-mode]").forEach(function (select) {
-      syncAddressField(select);
-      select.addEventListener("change", function () {
-        syncAddressField(select);
-      });
-    });
-  }
-
-  // --- Custom DMARC rua address shown only for "custom" mode ------------
-  // Same idea as the address list: the email field only applies when the
-  // operator picks Custom address. With JavaScript blocked the field stays
-  // visible and the server still ignores it for inherit/none.
-  function syncCustomAddressField(select) {
-    var form = select.closest("form");
-    var field = form && form.querySelector("[data-custom-address]");
-    if (!field) {
+    for (var i = 0; i < showWhenRules.length; i++) {
+      var rule = showWhenRules[i];
+      if (!control.matches(rule.match)) {
+        continue;
+      }
+      var target = form.querySelector(rule.target);
+      if (!target) {
+        return;
+      }
+      var show = rule.visible(control);
+      target.hidden = !show;
+      if (!show && rule.clearWhenHidden) {
+        target.querySelectorAll("input").forEach(function (input) {
+          input.value = "";
+        });
+      }
       return;
     }
-    field.hidden = select.value !== select.dataset.customMode;
   }
 
-  function initCustomAddressFields(root) {
-    root.querySelectorAll("select[data-custom-mode]").forEach(function (select) {
-      syncCustomAddressField(select);
-      select.addEventListener("change", function () {
-        syncCustomAddressField(select);
-      });
-    });
-  }
-
-  // --- Domain pick shown only for domain administrators ------------------
-  // Global administrators manage every domain, so the assignment checkboxes
-  // are irrelevant for that role. The toggle runs on load too, because the
-  // edit form of an existing global user should not flash the fieldset.
-  function syncDomainPickField(select) {
-    var form = select.closest("form");
-    var field = form && form.querySelector("[data-domain-pick]");
-    if (!field) {
-      return;
-    }
-    field.hidden = select.value === select.dataset.globalRole;
-  }
-
-  function initDomainPickFields(root) {
-    root.querySelectorAll("select[data-global-role]").forEach(function (select) {
-      syncDomainPickField(select);
-      select.addEventListener("change", function () {
-        syncDomainPickField(select);
-      });
-    });
-  }
-
-  // --- Encryption password fields shown only when asked for --------------
-  // The backup, export and import forms carry an optional password block. It
-  // is hidden until the checkbox next to it is ticked, and cleared when it is
-  // unticked, so a password typed and then abandoned is never submitted. With
-  // JavaScript blocked the block stays visible and the forms behave exactly as
-  // the server reads them: the checkbox alone decides whether encryption
-  // happens.
-  function syncEncryptFields(box) {
-    var form = box.closest("form");
-    var fields = form && form.querySelector("[data-encrypt-fields]");
-    if (!fields) {
-      return;
-    }
-    fields.hidden = !box.checked;
-    if (!box.checked) {
-      fields.querySelectorAll("input").forEach(function (input) {
-        input.value = "";
-      });
-    }
-  }
-
-  function initEncryptFields(root) {
-    root.querySelectorAll("input[data-encrypt-toggle]").forEach(function (box) {
-      syncEncryptFields(box);
-      box.addEventListener("change", function () {
-        syncEncryptFields(box);
-      });
-    });
-  }
-
-  // --- Import password field shown based on the chosen file's extension ---
-  // The domain-import file decides for itself whether it is encrypted (the
-  // server checks the envelope magic, not a checkbox), so the panel offers
-  // the password field the same way: reveal it for a .spde file, hide and
-  // clear it for a plain .json one. With no file chosen yet there is nothing
-  // to ask a password for, so the field stays hidden until a file names it.
-  // An unrecognised name leaves the field visible rather than guessing wrong
-  // and hiding a password the file needs.
-  function syncImportPasswordField(input) {
-    var form = input.closest("form");
-    var fields = form && form.querySelector("[data-import-password-fields]");
-    if (!fields) {
-      return;
-    }
-    var name = (input.files && input.files[0] && input.files[0].name || "").toLowerCase();
-    var hide = name === "" || /\.json$/.test(name);
-    fields.hidden = hide;
-    if (hide) {
-      fields.querySelectorAll("input").forEach(function (pw) {
-        pw.value = "";
-      });
-    }
-  }
-
-  function initImportPasswordField(root) {
-    root.querySelectorAll("input[data-import-file]").forEach(function (input) {
-      syncImportPasswordField(input);
-      input.addEventListener("change", function () {
-        syncImportPasswordField(input);
+  function initShowWhen(root) {
+    showWhenRules.forEach(function (rule) {
+      root.querySelectorAll(rule.match).forEach(function (control) {
+        syncShowWhen(control);
+        control.addEventListener("change", function () {
+          syncShowWhen(control);
+        });
       });
     });
   }
 
   document.addEventListener("DOMContentLoaded", function () {
-    initAddressFields(document);
-    initCustomAddressFields(document);
-    initDomainPickFields(document);
-    initEncryptFields(document);
-    initImportPasswordField(document);
+    initShowWhen(document);
   });
 
   // --- Adaptive monitoring polling ---------------------------------------

internal/web/view/templates/domain_detail.html

@@ -171,8 +171,7 @@
 
     {{if .SameDomainRUA}}
     <p class="error">The report address is on this sending domain. SelfPost does
-    not receive inbound mail — use a mailbox elsewhere or wait for in-panel report
-    reception in a future release.</p>
+    not receive inbound mail — use a mailbox on another domain.</p>
     {{end}}
 
     {{if .NeedsReportAuth}}

internal/web/view/templates/settings.html

@@ -42,8 +42,8 @@
     <h2>DMARC aggregate reports</h2>
     <p class="muted">Optional default <code>rua=</code> address for every sending
     domain (can be overridden per domain). Use a mailbox on a domain that
-    receives inbound mail. SelfPost is send-only today; a future release will
-    be able to receive reports in the panel itself.</p>
+    receives inbound mail. SelfPost does not receive inbound mail — point
+    <code>rua=</code> at a mailbox elsewhere.</p>
 
     <label for="dmarc_report_email">Default report address</label>
     <input id="dmarc_report_email" name="dmarc_report_email" type="email"

internal/web/web.go

@@ -158,7 +158,7 @@ func (s *Server) Handler() http.Handler {
 	authed.HandleFunc("POST /applications/{aid}/delete", h.HandleDeleteApplication)
 	authed.HandleFunc("POST /reload", h.HandleReload)
 
-	authed.HandleFunc("/settings", h.HandleAccount)
+	authed.HandleFunc("/settings", h.HandleSettings)
 	authed.HandleFunc("/account", redirectSettings)
 
 	authed.HandleFunc("GET /users", h.HandleUsers)