Receive support for DOE messages

js/deletes.js

@@ -0,0 +1,108 @@
+/* global
+  Backbone,
+  Whisper,
+  MessageController,
+  ConversationController
+*/
+
+/* eslint-disable more/no-then */
+
+// eslint-disable-next-line func-names
+(function() {
+  'use strict';
+
+  const ONE_DAY = 24 * 60 * 60 * 1000;
+
+  window.Whisper = window.Whisper || {};
+  Whisper.Deletes = new (Backbone.Collection.extend({
+    forMessage(message) {
+      const matchingDeletes = this.filter({
+        targetSentTimestamp: message.get('sent_at'),
+        fromId: message.getContact().get('id'),
+      });
+
+      if (matchingDeletes.length > 0) {
+        window.log.info('Found early DOE for message');
+        this.remove(matchingDeletes);
+        return matchingDeletes;
+      }
+
+      return [];
+    },
+    async onDelete(del) {
+      try {
+        const messages = await window.Signal.Data.getMessagesBySentAt(
+          del.get('targetSentTimestamp'),
+          {
+            MessageCollection: Whisper.MessageCollection,
+          }
+        );
+
+        // The contact the delete message came from
+        const fromContact = ConversationController.get(del.get('fromId'));
+
+        if (!fromContact) {
+          window.log.info(
+            'No contact for DOE',
+            del.get('fromId'),
+            del.get('targetSentTimestamp')
+          );
+
+          return;
+        }
+
+        const targetMessage = messages.find(m => {
+          const messageContact = m.getContact();
+
+          if (!messageContact) {
+            return false;
+          }
+
+          // Find messages which are from the same contact who sent the DOE
+          return messageContact.get('id') === fromContact.get('id');
+        });
+
+        if (!targetMessage) {
+          window.log.info(
+            'No message for DOE',
+            del.get('fromId'),
+            del.get('targetSentTimestamp')
+          );
+
+          return;
+        }
+
+        // Make sure the server timestamps for the DOE and the matching message
+        // are less than one day apart
+        const delta = Math.abs(
+          del.get('serverTimestamp') - targetMessage.get('serverTimestamp')
+        );
+        if (delta > ONE_DAY) {
+          window.log.info('Received late DOE. Dropping.', {
+            fromId: del.get('fromId'),
+            targetSentTimestamp: del.get('targetSentTimestamp'),
+            messageServerTimestamp: message.get('serverTimestamp'),
+            deleteServerTimestamp: del.get('serverTimestamp'),
+          });
+          this.remove(del);
+
+          return;
+        }
+
+        const message = MessageController.register(
+          targetMessage.id,
+          targetMessage
+        );
+
+        await message.handleDeleteForEveryone(del);
+
+        this.remove(del);
+      } catch (error) {
+        window.log.error(
+          'Deletes.onDelete error:',
+          error && error.stack ? error.stack : error
+        );
+      }
+    },
+  }))();
+})();