fix cache on email update [fix #18]

Author: zekroTJA

internal/webserver/handlers.go

@@ -687,6 +687,9 @@ func (ws *WebServer) handlerPostMail(ctx *routing.Context) error {
 			return jsonError(ctx, err, fasthttp.StatusInternalServerError)
 		}
 
+		user.MailAddress = ""
+		ws.cache.SetUserByID(user.UID, user)
+
 		return jsonResponse(ctx, nil, fasthttp.StatusOK)
 	}
 
@@ -738,6 +741,11 @@ func (ws *WebServer) handlerPostConfirmMail(ctx *routing.Context) error {
 		return jsonError(ctx, err, fasthttp.StatusInternalServerError)
 	}
 
+	if user, err := ws.cache.GetUserByID(data.UserID); err == nil && user != nil {
+		user.MailAddress = data.MailAddress
+		ws.cache.SetUserByID(user.UID, user)
+	}
+
 	return jsonResponse(ctx, err, fasthttp.StatusOK)
 }