Clean up link preview on incoming messages.

SignalServiceKit/src/Messages/OWSMessageManager.m

@@ -1409,14 +1409,7 @@ NS_ASSUME_NONNULL_BEGIN
                 dispatch_async(dispatch_get_main_queue(), ^{
                     NSString *url = [OWSLinkPreview previewURLForRawBodyText:incomingMessage.body];
                     if (url != nil) {
-                        [OWSLinkPreview tryToBuildPreviewInfoObjcWithPreviewUrl:url]
-                        .thenOn(dispatch_get_main_queue(), ^(OWSLinkPreviewDraft *linkPreviewDraft) {
-                            [OWSPrimaryStorage.sharedManager.dbReadWriteConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
-                                OWSLinkPreview *linkPreview = [OWSLinkPreview buildValidatedLinkPreviewFromInfo:linkPreviewDraft transaction:transaction error:nil];
-                                incomingMessage.linkPreview = linkPreview;
-                                [incomingMessage saveWithTransaction:transaction];
-                            }];
-                        });
+                        [self handleLinkPreviewsIfNeededWithUrl:url message:incomingMessage];
                     }
                 });
 
@@ -1518,12 +1511,21 @@ NS_ASSUME_NONNULL_BEGIN
                 linkPreviewURL = [OWSLinkPreview previewURLForRawBodyText:incomingMessage.body];
             }
             if (linkPreviewURL != nil) {
+                [self handleLinkPreviewsIfNeededWithUrl:linkPreviewURL message:incomingMessage];
+            }
+        });
+        
+        return incomingMessage;
+    }
+}
+
+- (void)handleLinkPreviewsIfNeededWithUrl:(NSString *)linkPreviewURL message:(TSMessage *)message {
     [OWSLinkPreview tryToBuildPreviewInfoObjcWithPreviewUrl:linkPreviewURL]
     .thenOn(dispatch_get_main_queue(), ^(OWSLinkPreviewDraft *linkPreviewDraft) {
         [OWSPrimaryStorage.sharedManager.dbReadWriteConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
             OWSLinkPreview *linkPreview = [OWSLinkPreview buildValidatedLinkPreviewFromInfo:linkPreviewDraft transaction:transaction error:nil];
-                        incomingMessage.linkPreview = linkPreview;
-                        [incomingMessage saveWithTransaction:transaction];
+            message.linkPreview = linkPreview;
+            [message saveWithTransaction:transaction];
         }];
     })
     .catchOn(dispatch_get_main_queue(), ^(NSError *error) {
@@ -1543,27 +1545,22 @@ NS_ASSUME_NONNULL_BEGIN
         // If we managed to get direct previews then render them
         [OWSPrimaryStorage.sharedManager.dbReadWriteConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
             if (linkPreview.isDirectAttachment) {
-                            if (!incomingMessage.hasAttachments) {
-                                [incomingMessage addAttachmentId:linkPreview.imageAttachmentId transaction:transaction];
+                if (!message.hasAttachments) {
+                    [message addAttachmentId:linkPreview.imageAttachmentId transaction:transaction];
                     
                     // Set the message id in attachment
                     TSAttachment *linkPreviewAttachment = [TSAttachment fetchObjectWithUniqueID:linkPreview.imageAttachmentId transaction:transaction];
-                                linkPreviewAttachment.albumMessageId = incomingMessage.uniqueId;
+                    linkPreviewAttachment.albumMessageId = message.uniqueId;
                     [linkPreviewAttachment saveWithTransaction:transaction];
                 }
             } else {
-                            incomingMessage.linkPreview = linkPreview;
-                            [incomingMessage saveWithTransaction:transaction];
+                message.linkPreview = linkPreview;
+                [message saveWithTransaction:transaction];
             }
             
         }];
     });
 }
-        });
-        
-        return incomingMessage;
-    }
-}
 
 // The difference between this function and `handleFriendRequestAcceptIfNeededWithEnvelope:` is that this will setup the incoming message for display to the user
 // While `handleFriendRequestAcceptIfNeededWithEnvelope:` handles friend request accepting logic and doesn't need a message