internal/api/handler/user.go

@@ -11,10 +11,11 @@ import (
 
 type UserHandler struct {
 	UserService *domain.UserService
+	AuthService *domain.AuthService
 }
 
-func NewUserHandler(userService *domain.UserService) *UserHandler {
+func NewUserHandler(userService *domain.UserService, authService *domain.AuthService) *UserHandler {
-	return &UserHandler{UserService: userService}
+	return &UserHandler{UserService: userService, AuthService: authService}
 }
 
 // CreateUser handles the creation of a user
@@ -49,3 +50,49 @@ func (h *UserHandler) CreateUser(w http.ResponseWriter, r *http.Request) {
 	slog.InfoContext(ctx, "created user successfully", slog.Any("user_id", user.ID))
 	response.JSON(ctx, w, http.StatusCreated, user)
 }
+
+// ChangePassword handles changing a users password
+//
+// @Summary Change password route
+// @Description Change password for the authenticated user
+// @Tags User
+// @Accept json
+// @Produce json
+// @Param payload body request.ChangePasswordPayload true "Change password payload"
+// @Success 204
+// @Error 400 {object} response.ErrorResponse "failed to decode request body"
+// @Error 500 {object} response.ErrorResponse "could not get auth context"
+// @Error 500 {object} response.ErrorResponse "failed to change password"
+// @Router /users/password [post]
+func (h *UserHandler) ChangePassword(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	payload, err := request.DecodeJSON[request.ChangePasswordPayload](r)
+	if err != nil {
+		slog.ErrorContext(ctx, "failed to decode change password payload", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusBadRequest, "failed to decode request body")
+		return
+	}
+
+	authContext, err := domain.GetAuthContext(ctx)
+	if err != nil {
+		slog.ErrorContext(ctx, "failed to get auth context", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusInternalServerError, "could not get auth context")
+		return
+	}
+
+	err = h.UserService.ChangePassword(ctx, authContext.UserID, payload.Password)
+	if err != nil {
+		slog.ErrorContext(ctx, "failed to change password", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusInternalServerError, "failed to change password")
+		return
+	}
+
+	err = h.AuthService.LogoutAllDevices(ctx, authContext.UserID)
+	if err != nil {
+		slog.WarnContext(ctx, "failed to logout user from all devices after password change", slog.Any("error", err))
+	}
+
+	slog.InfoContext(ctx, "password changed successfully", slog.Any("user_id", authContext.UserID))
+	response.Status(ctx, w, http.StatusNoContent)
+}

internal/api/request/user.go

@@ -5,3 +5,7 @@ type CreateUserPayload struct {
 	Name     string `json:"name"`
 	Password string `json:"password"`
 }
+
+type ChangePasswordPayload struct {
+	Password string `json:"password"`
+}

internal/api/router/router.go

@@ -16,14 +16,14 @@ type Config struct {
 }
 
 func NewMux(cfg Config) http.Handler {
-	userRepo := repository.NewUserRepo(cfg.Database)
-	userService := domain.NewUserService(userRepo)
-	userHandler := handler.NewUserHandler(userService)
-
 	authRepo := repository.NewAuthRepo(cfg.Database)
 	authService := domain.NewAuthService(authRepo, []byte(cfg.JWTSecret))
 	authHandler := handler.NewAuthHandler(authService)
 
+	userRepo := repository.NewUserRepo(cfg.Database)
+	userService := domain.NewUserService(userRepo)
+	userHandler := handler.NewUserHandler(userService, authService)
+
 	listRepo := repository.NewListRepo(cfg.Database)
 	listService := domain.NewListService(listRepo)
 	listHandler := handler.NewListHandler(listService, userService)
@@ -40,6 +40,7 @@ func NewMux(cfg Config) http.Handler {
 	apiMux.HandleFunc("POST /logout/all", authHandler.LogoutAllDevices)
 
 	apiMux.Handle("POST /users", protected(userHandler.CreateUser))
+	apiMux.Handle("POST /users/password", protected(userHandler.ChangePassword))
 
 	apiMux.Handle("POST /lists", protected(listHandler.CreateList))
 	apiMux.Handle("DELETE /lists/{id}", protected(listHandler.DeleteList))

internal/domain/user.go

@@ -8,6 +8,13 @@ import (
 	"golang.org/x/crypto/bcrypt"
 )
 
+var (
+	ErrUserIDMissing   = errors.New("user id is missing")
+	ErrEmailMissing    = errors.New("email is required")
+	ErrNameMissing     = errors.New("name is required")
+	ErrPasswordMissing = errors.New("password is required")
+)
+
 type User struct {
 	ID        string    `json:"id"`
 	Email     string    `json:"email"`
@@ -17,6 +24,7 @@ type User struct {
 
 type UserRepository interface {
 	CreateUser(ctx context.Context, email string, name string, passwordHash string) (*User, error)
+	ChangePassword(ctx context.Context, userID string, passwordHash string) error
 	GetUserByEmail(ctx context.Context, email string) (*User, error)
 }
 
@@ -30,13 +38,13 @@ func NewUserService(r UserRepository) *UserService {
 
 func (s *UserService) CreateUser(ctx context.Context, email string, name string, password string) (*User, error) {
 	if len(email) == 0 {
-		return nil, errors.New("email is required")
+		return nil, ErrEmailMissing
 	}
 	if len(name) == 0 {
-		return nil, errors.New("name is required")
+		return nil, ErrNameMissing
 	}
 	if len(password) == 0 {
-		return nil, errors.New("password is required")
+		return nil, ErrPasswordMissing
 	}
 
 	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
@@ -47,6 +55,22 @@ func (s *UserService) CreateUser(ctx context.Context, email string, name string,
 	return s.repo.CreateUser(ctx, email, name, string(hash))
 }
 
+func (s *UserService) ChangePassword(ctx context.Context, userID string, password string) error {
+	if len(userID) == 0 {
+		return ErrUserIDMissing
+	}
+	if len(password) == 0 {
+		return ErrPasswordMissing
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	return s.repo.ChangePassword(ctx, userID, string(hash))
+}
+
 func (s *UserService) GetUserByEmail(ctx context.Context, email string) (*User, error) {
 	return s.repo.GetUserByEmail(ctx, email)
 }

internal/repository/user.go

@@ -40,6 +40,18 @@ func (r *UserRepo) CreateUser(ctx context.Context, email string, name string, pa
 	return user, nil
 }
 
+func (r *UserRepo) ChangePassword(ctx context.Context, userID string, passwordHash string) error {
+	_, err := r.db.ExecContext(ctx,
+		"UPDATE users SET password_hash = $1 WHERE id = $2",
+		passwordHash, userID,
+	)
+	if err != nil {
+		return fmt.Errorf("failed to update user: %w", err)
+	}
+
+	return nil
+}
+
 func (r *UserRepo) GetUserByEmail(ctx context.Context, email string) (*domain.User, error) {
 	user := &domain.User{}