Add multi language support for authentication middleware

authentication/auth.go

@@ -78,10 +78,10 @@ func LogoutSession(writer http.ResponseWriter, request *http.Request, sessionSto
 	http.Redirect(writer, request, redirectUrl, http.StatusTemporaryRedirect)
 }
 
-func Middleware(store *sessions.CookieStore, excludedPrefixes []string, redirectUrl string) MiddlewareFunc {
+func Middleware(store *sessions.CookieStore, excludedPrefixes []string, redirect LanguagePaths) MiddlewareFunc {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			Debug("Authenticating")
+			Debug("Authenticating for page", r.URL.Path)
 			if r.Method == http.MethodOptions {
 				next.ServeHTTP(w, r)
 				return
@@ -92,16 +92,32 @@ func Middleware(store *sessions.CookieStore, excludedPrefixes []string, redirect
 					return
 				}
 			}
-			ok, r, err := SetUserIdAndEmailFromSessionStore(r, store)
+			for _, path := range redirect {
+				if strings.HasPrefix(r.URL.Path, path) {
+					next.ServeHTTP(w, r)
+					return
+				}
+			}
+			ok, newR, err := SetUserIdAndEmailFromSessionStore(r, store)
 			if err != nil {
 				LogError("Failed to set user id and email from session: %v", err)
 				http.Error(w, "Internal server error", http.StatusInternalServerError)
 				return
 			}
 			if ok {
-				next.ServeHTTP(w, r)
+				next.ServeHTTP(w, newR)
 			} else {
-				Debug("Redirecting to login because there is no session")
+				redirectUrl := En.GetPath() + redirect[En]
+				for lang, path := range redirect {
+					if strings.HasPrefix(r.URL.Path, lang.GetPath()) {
+						redirectUrl = lang.GetPath() + path
+						break
+					}
+				}
+				if redirectUrl == "" {
+					redirectUrl = "/"
+				}
+				Debug("Redirecting to ", redirectUrl, "because there is no session")
 				http.Redirect(w, r, redirectUrl, http.StatusTemporaryRedirect)
 			}
 		})

authentication/login_page.go

@@ -23,7 +23,10 @@ func NewLoginPage(e *echo.Echo, createPage ersteller_lib.CreatePageFunc, googleL
 
 func (l *LoginPage) Render(c echo.Context) error {
 	return l.createPage(c, ersteller_lib.PageWebsiteMetaData{
-		Title:          "Login",
+		Title: ersteller_lib.NewI18nText(map[ersteller_lib.Language]string{
+			ersteller_lib.En: "Login",
+			ersteller_lib.De: "Anmelden",
+		}),
 		HideNavigation: true,
 	}, l.getLoginPage())
 }