FEATURE: the ability to permanently destroy the private message (#11115)

PostDestroyer should accept the option to permanently destroy post from the database. In addition, when the first post is destroyed it destroys the whole topic.

Currently, that feature is limited to private messages and creator of the post. It will be used by discourse-encrypt to explode encrypted private messages.

app/assets/javascripts/discourse/app/controllers/topic.js

@@ -1424,6 +1424,12 @@ export default Controller.extend(bufferedProperty("model"), {
               .then(() => refresh({ id: data.id }));
             break;
           }
+          case "destroyed": {
+            postStream
+              .triggerDestroyedPost(data.id)
+              .then(() => refresh({ id: data.id }));
+            break;
+          }
           case "recovered": {
             postStream
               .triggerRecoveredPost(data.id)

app/assets/javascripts/discourse/app/models/post-stream.js

@@ -737,6 +737,12 @@ export default RestModel.extend({
     return Promise.resolve();
   },
 
+  triggerDestroyedPost(postId) {
+    const existing = this._identityMap[postId];
+    this.removePosts([existing]);
+    return Promise.resolve();
+  },
+
   triggerChangedPost(postId, updatedAt, opts) {
     opts = opts || {};
 

app/assets/javascripts/discourse/app/models/topic-tracking-state.js

@@ -6,6 +6,7 @@ import PreloadStore from "discourse/lib/preload-store";
 import Category from "discourse/models/category";
 import User from "discourse/models/user";
 import { deepEqual } from "discourse-common/lib/object";
+import DiscourseURL from "discourse/lib/url";
 
 function isNew(topic) {
   return (
@@ -148,6 +149,17 @@ const TopicTrackingState = EmberObject.extend({
       }
       tracker.incrementMessageCount();
     });
+
+    this.messageBus.subscribe("/destroy", (msg) => {
+      tracker.incrementMessageCount();
+      const currentRoute = DiscourseURL.router.currentRoute.parent;
+      if (
+        currentRoute.name === "topic" &&
+        parseInt(currentRoute.params.id, 10) === msg.topic_id
+      ) {
+        DiscourseURL.redirectTo("/");
+      }
+    });
   },
 
   mutedTopics() {