add multiple flash support

server/ctrladmin/ctrl.go

@@ -111,8 +111,8 @@ type Response struct {
 	data     *templateData
 	// code is 303
 	redirect string
-	flashN   string // normal
+	flashN   []string // normal
-	flashW   string // warning
+	flashW   []string // warning
 	// code is >= 400
 	code int
 	err  string
@@ -177,6 +177,13 @@ func (c *Controller) H(h adminHandler) http.Handler {
 // ## begin utilities
 // ## begin utilities
 
+type FlashType string
+
+const (
+	FlashNormal  = FlashType("normal")
+	FlashWarning = FlashType("warning")
+)
+
 func firstExisting(or string, strings ...string) string {
 	for _, s := range strings {
 		if s != "" {
@@ -194,35 +201,27 @@ func sessLogSave(s *sessions.Session, w http.ResponseWriter, r *http.Request) {
 
 type Flash struct {
 	Message string
-	Type    string
+	Type    FlashType
 }
 
-func sessAddFlashW(s *sessions.Session, message string) {
+func sessAddFlashN(s *sessions.Session, messages []string) {
-	if message == "" {
+	sessAddFlash(s, messages, FlashNormal)
+}
+
+func sessAddFlashW(s *sessions.Session, messages []string) {
+	sessAddFlash(s, messages, FlashWarning)
+}
+
+func sessAddFlash(s *sessions.Session, messages []string, flashT FlashType) {
+	if len(messages) == 0 {
 		return
 	}
-	s.AddFlash(Flash{
+	for _, message := range messages {
-		Message: message,
+		s.AddFlash(Flash{
-		Type:    "warning",
+			Message: message,
-	})
+			Type:    flashT,
-}
+		})
-
-func sessAddFlashWf(s *sessions.Session, message string, a ...interface{}) {
-	sessAddFlashW(s, fmt.Sprintf(message, a...))
-}
-
-func sessAddFlashN(s *sessions.Session, message string) {
-	if message == "" {
-		return
 	}
-	s.AddFlash(Flash{
-		Message: message,
-		Type:    "normal",
-	})
-}
-
-func sessAddFlashNf(s *sessions.Session, message string, a ...interface{}) {
-	sessAddFlashN(s, fmt.Sprintf(message, a...))
 }
 
 // ## begin validation

server/ctrladmin/handlers.go

@@ -76,7 +76,7 @@ func (c *Controller) ServeChangeOwnPasswordDo(r *http.Request) *Response {
 	if err != nil {
 		return &Response{
 			redirect: r.Referer(),
-			flashW:   err.Error(),
+			flashW:   []string{err.Error()},
 		}
 	}
 	user := r.Context().Value(key.User).(*model.User)
@@ -101,7 +101,7 @@ func (c *Controller) ServeLinkLastFMDo(r *http.Request) *Response {
 	if err != nil {
 		return &Response{
 			redirect: "/admin/home",
-			flashW:   err.Error(),
+			flashW:   []string{err.Error()},
 		}
 	}
 	user := r.Context().Value(key.User).(*model.User)
@@ -148,7 +148,7 @@ func (c *Controller) ServeChangePasswordDo(r *http.Request) *Response {
 	if err != nil {
 		return &Response{
 			redirect: r.Referer(),
-			flashW:   err.Error(),
+			flashW:   []string{err.Error()},
 		}
 	}
 	user := c.DB.GetUserFromName(username)
@@ -197,7 +197,7 @@ func (c *Controller) ServeCreateUserDo(r *http.Request) *Response {
 	if err != nil {
 		return &Response{
 			redirect: r.Referer(),
-			flashW:   err.Error(),
+			flashW:   []string{err.Error()},
 		}
 	}
 	passwordOne := r.FormValue("password_one")
@@ -206,7 +206,7 @@ func (c *Controller) ServeCreateUserDo(r *http.Request) *Response {
 	if err != nil {
 		return &Response{
 			redirect: r.Referer(),
-			flashW:   err.Error(),
+			flashW:   []string{err.Error()},
 		}
 	}
 	user := model.User{
@@ -217,7 +217,7 @@ func (c *Controller) ServeCreateUserDo(r *http.Request) *Response {
 	if err != nil {
 		return &Response{
 			redirect: r.Referer(),
-			flashW:   fmt.Sprintf("could not create user `%s`: %v", username, err),
+			flashW:   []string{fmt.Sprintf("could not create user `%s`: %v", username, err)},
 		}
 	}
 	return &Response{redirect: "/admin/home"}
@@ -239,7 +239,7 @@ func (c *Controller) ServeUpdateLastFMAPIKeyDo(r *http.Request) *Response {
 	if err := validateAPIKey(apiKey, secret); err != nil {
 		return &Response{
 			redirect: r.Referer(),
-			flashW:   err.Error(),
+			flashW:   []string{err.Error()},
 		}
 	}
 	c.DB.SetSetting("lastfm_api_key", apiKey)

server/ctrladmin/handlers_raw.go

@@ -13,14 +13,14 @@ func (c *Controller) ServeLoginDo(w http.ResponseWriter, r *http.Request) {
 	username := r.FormValue("username")
 	password := r.FormValue("password")
 	if username == "" || password == "" {
-		sessAddFlashW(session, "please provide both a username and password")
+		sessAddFlashW(session, []string{"please provide username and password"})
 		sessLogSave(session, w, r)
 		http.Redirect(w, r, r.Referer(), http.StatusSeeOther)
 		return
 	}
 	user := c.DB.GetUserFromName(username)
 	if user == nil || password != user.Password {
-		sessAddFlashW(session, "invalid username / password")
+		sessAddFlashW(session, []string{"invalid username / password"})
 		sessLogSave(session, w, r)
 		http.Redirect(w, r, r.Referer(), http.StatusSeeOther)
 		return

server/ctrladmin/middleware.go

@@ -24,7 +24,7 @@ func (c *Controller) WithUserSession(next http.Handler) http.Handler {
 		session := r.Context().Value(key.Session).(*sessions.Session)
 		username, ok := session.Values["user"].(string)
 		if !ok {
-			sessAddFlashW(session, "you are not authenticated")
+			sessAddFlashW(session, []string{"you are not authenticated"})
 			sessLogSave(session, w, r)
 			http.Redirect(w, r, "/admin/login", http.StatusSeeOther)
 			return
@@ -50,7 +50,7 @@ func (c *Controller) WithAdminSession(next http.Handler) http.Handler {
 		session := r.Context().Value(key.Session).(*sessions.Session)
 		user := r.Context().Value(key.User).(*model.User)
 		if !user.IsAdmin {
-			sessAddFlashW(session, "you are not an admin")
+			sessAddFlashW(session, []string{"you are not an admin"})
 			sessLogSave(session, w, r)
 			http.Redirect(w, r, "/admin/login", http.StatusSeeOther)
 			return