Add password change functionality

- Add POST /api/auth/password API endpoint
  - Requires authentication and current password verification
  - Invalidates all other sessions after password change
  - Keeps current session active

- Add window.changePassword() console function
  - Matches existing login flow pattern
  - Usage: changePassword("current", "new")

- Add 'lookbook set-password' CLI command
  - Interactive password reset (no current password required)
  - Useful for recovery scenarios
  - Invalidates all sessions

- Add session.QDeleteAllExcept() and session.QDeleteAll()
  - Support for invalidating sessions after password change

cmd/server/main.go

@@ -13,8 +13,12 @@ import (
 	"time"
 
 	_ "github.com/jackc/pgx/v5/stdlib"
+	"golang.org/x/crypto/bcrypt"
+	"golang.org/x/term"
 
 	"git.soup.land/soup/sxgo/ssr"
+	"lookbook/internal/data/admin"
+	"lookbook/internal/data/session"
 	"lookbook/internal/handlers"
 	"lookbook/internal/middleware"
 	"lookbook/internal/migrations"
@@ -71,6 +75,8 @@ func main() {
 	switch mode {
 	case "web":
 		runWebServer(dbURL, logger)
+	case "set-password":
+		runSetPassword(dbURL, logger)
 	default:
 		logger.Error("unknown mode", slog.String("mode", mode))
 		printUsage()
@@ -81,6 +87,7 @@ func main() {
 func printUsage() {
 	fmt.Fprintln(os.Stderr, "Usage:")
 	fmt.Fprintln(os.Stderr, "  lookbook web           - Run web server")
+	fmt.Fprintln(os.Stderr, "  lookbook set-password  - Set/reset admin password")
 	fmt.Fprintln(os.Stderr, "")
 	fmt.Fprintln(os.Stderr, "Flags:")
 	fmt.Fprintln(os.Stderr, "  -migrate               Run database migrations")
@@ -134,6 +141,7 @@ func runWebServer(dbURL string, logger *slog.Logger) {
 	router.Handle("POST /api/auth/login", handlers.HandleLogin)
 	router.Handle("POST /api/auth/logout", handlers.HandleLogout)
 	router.Handle("GET /api/auth/status", handlers.HandleAuthStatus)
+	router.Handle("POST /api/auth/password", handlers.HandleChangePassword)
 
 	// Items API
 	router.Handle("GET /api/items", handlers.HandleListItems)
@@ -190,3 +198,71 @@ func waitForShutdown(server *http.Server, logger *slog.Logger) {
 		logger.Error("graceful shutdown failed", slog.Any("err", err))
 	}
 }
+
+func runSetPassword(dbURL string, logger *slog.Logger) {
+	fmt.Print("Enter new password: ")
+	password, err := readPassword()
+	if err != nil {
+		logger.Error("failed to read password", slog.Any("err", err))
+		os.Exit(1)
+	}
+
+	if password == "" {
+		logger.Error("password cannot be empty")
+		os.Exit(1)
+	}
+
+	fmt.Print("Confirm password: ")
+	confirm, err := readPassword()
+	if err != nil {
+		logger.Error("failed to read confirmation", slog.Any("err", err))
+		os.Exit(1)
+	}
+
+	if password != confirm {
+		logger.Error("passwords do not match")
+		os.Exit(1)
+	}
+
+	db, err := sql.Open("pgx", dbURL)
+	if err != nil {
+		logger.Error("failed to open database", slog.Any("err", err))
+		os.Exit(1)
+	}
+	defer db.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		logger.Error("failed to hash password", slog.Any("err", err))
+		os.Exit(1)
+	}
+
+	if err := admin.QSetPassword(ctx, db, hash); err != nil {
+		logger.Error("failed to set password", slog.Any("err", err))
+		os.Exit(1)
+	}
+
+	// Invalidate all sessions
+	if err := session.QDeleteAll(ctx, db); err != nil {
+		logger.Error("failed to clear sessions", slog.Any("err", err))
+		os.Exit(1)
+	}
+
+	logger.Info("password updated, all sessions invalidated")
+}
+
+func readPassword() (string, error) {
+	fd := int(os.Stdin.Fd())
+	if term.IsTerminal(fd) {
+		bytes, err := term.ReadPassword(fd)
+		fmt.Println() // newline after password input
+		return string(bytes), err
+	}
+	// Fallback for non-terminal (piped input)
+	var password string
+	_, err := fmt.Scanln(&password)
+	return password, err
+}

go.mod

@@ -1,6 +1,6 @@
 module lookbook
 
-go 1.23.0
+go 1.24.0
 
 require (
 	git.soup.land/soup/sxgo v0.1.1
@@ -19,5 +19,7 @@ require (
 	github.com/sethvargo/go-retry v0.3.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.16.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/term v0.39.0 // indirect
 	golang.org/x/text v0.27.0 // indirect
 )

go.sum

@@ -48,6 +48,10 @@ golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
 golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
 golang.org/x/sys v0.34.0 h1:H5Y5sJ2L2JRdyv7ROF1he/lPdvFsd0mJHFw2ThKHxLA=
 golang.org/x/sys v0.34.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
+golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/term v0.39.0 h1:RclSuaJf32jOqZz74CkPA9qFuVTX7vhLlpfj/IGWlqY=
+golang.org/x/term v0.39.0/go.mod h1:yxzUCTP/U+FzoxfdKmLaA0RV1WgE0VY7hXBwKtY/4ww=
 golang.org/x/text v0.27.0 h1:4fGWRpyh641NLlecmyl4LOe6yDdfaYNrGb2zdfo4JV4=
 golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/data/session/queries.go

@@ -71,3 +71,17 @@ func QDeleteExpired(ctx context.Context, db *sql.DB) error {
 	_, err := db.ExecContext(ctx, query)
 	return err
 }
+
+// QDeleteAllExcept deletes all sessions except the one with the given session ID.
+func QDeleteAllExcept(ctx context.Context, db *sql.DB, exceptSessionID string) error {
+	query := `DELETE FROM session WHERE session_id != $1`
+	_, err := db.ExecContext(ctx, query, exceptSessionID)
+	return err
+}
+
+// QDeleteAll deletes all sessions.
+func QDeleteAll(ctx context.Context, db *sql.DB) error {
+	query := `DELETE FROM session`
+	_, err := db.ExecContext(ctx, query)
+	return err
+}

internal/handlers/api_auth.go

@@ -25,6 +25,11 @@ type loginResponse struct {
 	Error     string `json:"error,omitempty"`
 }
 
+type changePasswordRequest struct {
+	CurrentPassword string `json:"currentPassword"`
+	NewPassword     string `json:"newPassword"`
+}
+
 // HandleLogin handles POST /api/auth/login
 // If no password is set, it sets the password. Otherwise, it verifies the password.
 func HandleLogin(rc *RequestContext, w http.ResponseWriter, r *http.Request) error {
@@ -126,6 +131,55 @@ func HandleAuthStatus(rc *RequestContext, w http.ResponseWriter, r *http.Request
 	})
 }
 
+// HandleChangePassword handles POST /api/auth/password
+func HandleChangePassword(rc *RequestContext, w http.ResponseWriter, r *http.Request) error {
+	if !rc.RequireAdmin(w) {
+		return nil
+	}
+
+	var req changePasswordRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid request"})
+	}
+
+	if req.CurrentPassword == "" || req.NewPassword == "" {
+		return writeJSON(w, http.StatusBadRequest, map[string]string{"error": "both passwords required"})
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
+	defer cancel()
+
+	// Get current password hash
+	adm, err := admin.QGet(ctx, rc.DB)
+	if err != nil {
+		return err
+	}
+
+	// Verify current password
+	if err := bcrypt.CompareHashAndPassword(adm.PasswordHash, []byte(req.CurrentPassword)); err != nil {
+		return writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "invalid current password"})
+	}
+
+	// Hash new password
+	hash, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	// Update password
+	if err := admin.QSetPassword(ctx, rc.DB, hash); err != nil {
+		return err
+	}
+
+	// Invalidate all other sessions (keep current session)
+	cookie, _ := r.Cookie("session_id")
+	if cookie != nil {
+		session.QDeleteAllExcept(ctx, rc.DB, cookie.Value)
+	}
+
+	return writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}
+
 func generateSessionID() (string, error) {
 	b := make([]byte, 32)
 	if _, err := rand.Read(b); err != nil {

internal/static/js/app.js

@@ -36,6 +36,28 @@ window.logout = async () => {
   }
 };
 
+window.changePassword = async (currentPassword, newPassword) => {
+  if (!currentPassword || !newPassword) {
+    console.error('Usage: changePassword("current-password", "new-password")');
+    return;
+  }
+  try {
+    const res = await fetch("/api/auth/password", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ currentPassword, newPassword }),
+    });
+    const data = await res.json();
+    if (res.ok) {
+      console.log("Password changed successfully!");
+    } else {
+      console.error(data.error || "Failed to change password");
+    }
+  } catch (err) {
+    console.error("Password change error:", err);
+  }
+};
+
 // Modal functions
 function showAddModal() {
   document.getElementById("add-modal").classList.add("active");