feat(panel): add domain-admin role with per-domain authorization

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

internal/web/auth/handlers.go

@@ -61,7 +61,7 @@ func (m *Module) clearSessionCookies(w http.ResponseWriter) {
 
 // HandleLogin serves the login form (GET) and authenticates (POST).
 func (m *Module) HandleLogin(w http.ResponseWriter, r *http.Request) {
-	exists, err := m.store.AdminExists()
+	exists, err := m.store.UserExists()
 	if err != nil {
 		http.Error(w, "internal error", http.StatusInternalServerError)
 		return
@@ -106,22 +106,21 @@ func (m *Module) submitLogin(w http.ResponseWriter, r *http.Request) {
 	username := strings.TrimSpace(r.PostFormValue("username"))
 	password := r.PostFormValue("password")
 
-	admin, err := m.store.GetAdmin()
+	user, err := m.store.GetUserByUsername(username)
 	if err != nil {
-		if !errors.Is(err, store.ErrNoAdmin) {
-			logf("panel: login: get admin failed: %v", err)
+		if !errors.Is(err, store.ErrUserNotFound) {
+			logf("panel: login: get user 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 {
+	if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password)); err != nil {
 		m.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
 		return
 	}
 
-	token := m.sessions.Create(admin.Username)
+	token := m.sessions.Create(user.Username)
 	m.setSessionCookie(w, token)
 	http.Redirect(w, r, "/", http.StatusSeeOther)
 }
@@ -222,13 +221,13 @@ func (m *Module) submitSetup(w http.ResponseWriter, r *http.Request, token strin
 		return
 	}
 
-	if err := m.store.CreateAdmin(username, string(hash)); err != nil {
-		if exists, _ := m.store.AdminExists(); exists {
+	if err := m.store.CreateGlobalUser(username, string(hash)); err != nil {
+		if exists, _ := m.store.UserExists(); exists {
 			m.setup.complete()
 			http.Redirect(w, r, "/login", http.StatusSeeOther)
 			return
 		}
-		logf("panel: setup: create admin failed: %v", err)
+		logf("panel: setup: create user failed: %v", err)
 		m.renderSetupForm(w, http.StatusInternalServerError, token, "Internal error. Please try again.")
 		return
 	}

internal/web/auth/middleware.go

@@ -1,17 +1,12 @@
 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.
+// principal 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)
@@ -27,7 +22,13 @@ func (m *Module) RequireAuth(next http.Handler) http.Handler {
 		if isSessionActivity(r) && m.sessions.Touch(token) {
 			m.setSessionCookie(w, token)
 		}
-		ctx := context.WithValue(r.Context(), usernameKey, username)
+		u, err := m.store.GetUserByUsername(username)
+		if err != nil {
+			http.Redirect(w, r, "/login", http.StatusSeeOther)
+			return
+		}
+		p := principalFromUser(u)
+		ctx := withPrincipal(r.Context(), p)
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
@@ -43,3 +44,15 @@ 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/principal.go

@@ -0,0 +1,86 @@
+package auth
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/mixeme/selfpost/internal/store"
+)
+
+type ctxKey int
+
+const (
+	usernameKey   ctxKey = 0
+	principalKey  ctxKey = 1
+)
+
+// Role is a panel user's access level.
+type Role = store.Role
+
+const (
+	RoleGlobal      = store.RoleGlobal
+	RoleDomainAdmin = store.RoleDomainAdmin
+)
+
+// Principal is the authenticated panel user attached to a request.
+type Principal struct {
+	ID       int64
+	Username string
+	Role     Role
+	Domains  []int64 // assigned domain IDs; empty for global (all domains)
+}
+
+// IsGlobal reports whether the principal has full panel access.
+func (p Principal) IsGlobal() bool {
+	return p.Role == RoleGlobal
+}
+
+// CanAccessDomain reports whether the principal may access a domain id.
+func (p Principal) CanAccessDomain(domainID int64) bool {
+	if p.IsGlobal() {
+		return true
+	}
+	for _, id := range p.Domains {
+		if id == domainID {
+			return true
+		}
+	}
+	return false
+}
+
+// CanAccessApp reports whether the principal may access an application.
+func (p Principal) CanAccessApp(app store.Application) bool {
+	return p.CanAccessDomain(app.DomainID)
+}
+
+func principalFromUser(u store.User) Principal {
+	return Principal{
+		ID:       u.ID,
+		Username: u.Username,
+		Role:     u.Role,
+		Domains:  u.DomainIDs,
+	}
+}
+
+func withPrincipal(ctx context.Context, p Principal) context.Context {
+	ctx = context.WithValue(ctx, usernameKey, p.Username)
+	return context.WithValue(ctx, principalKey, p)
+}
+
+// CurrentPrincipal returns the authenticated principal from the request context.
+func CurrentPrincipal(ctx context.Context) (Principal, bool) {
+	if v, ok := ctx.Value(principalKey).(Principal); ok {
+		return v, true
+	}
+	return Principal{}, false
+}
+
+// PrincipalFromRequest returns the authenticated principal from an HTTP request.
+func PrincipalFromRequest(r *http.Request) (Principal, bool) {
+	return CurrentPrincipal(r.Context())
+}
+
+// RequestWithPrincipal attaches a principal for middleware-equivalent tests.
+func RequestWithPrincipal(r *http.Request, p Principal) *http.Request {
+	return r.WithContext(withPrincipal(r.Context(), p))
+}

internal/web/auth/setup.go

@@ -33,7 +33,7 @@ func newSetupManager(st *store.Store, hostname, tokenPath string) *setupManager
 }
 
 func (m *setupManager) bootstrap() error {
-	done, err := m.store.AdminExists()
+	done, err := m.store.UserExists()
 	if err != nil {
 		return err
 	}
@@ -48,9 +48,9 @@ func (m *setupManager) bootstrap() error {
 }
 
 func (m *setupManager) activeToken() (string, bool) {
-	done, err := m.store.AdminExists()
+	done, err := m.store.UserExists()
 	if err != nil {
-		logf("panel: setup: admin check failed: %v", err)
+		logf("panel: setup: user check failed: %v", err)
 		return "", false
 	}
 	if done {