PLT-5702 Added special error page for private browsing error message (#5985)

webapp/utils/constants.jsx

@@ -281,6 +281,10 @@ export const StatTypes = keyMirror({
     MONTHLY_ACTIVE_USERS: null
 });
 
+export const ErrorPageTypes = {
+    LOCAL_STORAGE: 'local_storage'
+};
+
 export const Constants = {
     Preferences,
     SocketEvents,
@@ -290,6 +294,8 @@ export const Constants = {
     UserSearchOptions,
     TutorialSteps,
     PostTypes,
+    ErrorPageTypes,
+
     IGNORE_POST_TYPES: [PostTypes.JOIN_LEAVE, PostTypes.JOIN_CHANNEL, PostTypes.LEAVE_CHANNEL, PostTypes.REMOVE_FROM_CHANNEL, PostTypes.ADD_TO_CHANNEL, PostTypes.ADD_REMOVE],
 
     PayloadSources: keyMirror({

webapp/utils/markdown.jsx

@@ -163,6 +163,10 @@ class MattermostMarkdownRenderer extends marked.Renderer {
     link(href, title, text) {
         let outHref = href;
 
+        if (this.formattingOptions.linkFilter && !this.formattingOptions.linkFilter(outHref)) {
+            return text;
+        }
+
         try {
             let unescaped = unescape(href);
             try {