From c033464b924a91c8e80bd8a315153037450dcf96 Mon Sep 17 00:00:00 2001
From: MeiMei <30769358+mei23@users.noreply.github.com>
Date: Sun, 8 Sep 2019 11:30:44 +0900
Subject: [PATCH] AP Undo Announce (#5400)

* AP Undo Announce

* Use activity id
---
 src/remote/activitypub/kernel/undo/announce.ts | 16 ++++++++++++++++
 src/remote/activitypub/kernel/undo/index.ts    |  6 +++++-
 src/services/note/delete.ts                    | 14 +++++++++++++-
 3 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 src/remote/activitypub/kernel/undo/announce.ts

diff --git a/src/remote/activitypub/kernel/undo/announce.ts b/src/remote/activitypub/kernel/undo/announce.ts
new file mode 100644
index 0000000000..38ce5b6c59
--- /dev/null
+++ b/src/remote/activitypub/kernel/undo/announce.ts
@@ -0,0 +1,16 @@
+import { Notes } from '../../../../models';
+import { IRemoteUser } from '../../../../models/entities/user';
+import { IAnnounce, getApId } from '../../type';
+import deleteNote from '../../../../services/note/delete';
+
+export const undoAnnounce = async (actor: IRemoteUser, activity: IAnnounce): Promise<void> => {
+	const uri = getApId(activity);
+
+	const note = await Notes.findOne({
+		uri
+	});
+
+	if (!note) return;
+
+	await deleteNote(actor, note);
+};
diff --git a/src/remote/activitypub/kernel/undo/index.ts b/src/remote/activitypub/kernel/undo/index.ts
index 5f2e58c3bf..f49f66cc69 100644
--- a/src/remote/activitypub/kernel/undo/index.ts
+++ b/src/remote/activitypub/kernel/undo/index.ts
@@ -1,8 +1,9 @@
 import { IRemoteUser } from '../../../../models/entities/user';
-import { IUndo, IFollow, IBlock, ILike } from '../../type';
+import { IUndo, IFollow, IBlock, ILike, IAnnounce } from '../../type';
 import unfollow from './follow';
 import unblock from './block';
 import undoLike from './like';
+import { undoAnnounce } from './announce';
 import Resolver from '../../resolver';
 import { apLogger } from '../../logger';
 
@@ -38,5 +39,8 @@ export default async (actor: IRemoteUser, activity: IUndo): Promise<void> => {
 		case 'Like':
 			undoLike(actor, object as ILike);
 			break;
+		case 'Announce':
+			undoAnnounce(actor, object as IAnnounce);
+			break;
 	}
 };
diff --git a/src/services/note/delete.ts b/src/services/note/delete.ts
index 95776f7287..0f087de420 100644
--- a/src/services/note/delete.ts
+++ b/src/services/note/delete.ts
@@ -1,5 +1,7 @@
 import { publishNoteStream } from '../stream';
 import renderDelete from '../../remote/activitypub/renderer/delete';
+import renderAnnounce from '../../remote/activitypub/renderer/announce';
+import renderUndo from '../../remote/activitypub/renderer/undo';
 import { renderActivity } from '../../remote/activitypub/renderer';
 import { deliver } from '../../queue';
 import renderTombstone from '../../remote/activitypub/renderer/tombstone';
@@ -35,7 +37,17 @@ export default async function(user: User, note: Note, quiet = false) {
 
 		//#region ローカルの投稿なら削除アクティビティを配送
 		if (Users.isLocalUser(user)) {
-			const content = renderActivity(renderDelete(renderTombstone(`${config.url}/notes/${note.id}`), user));
+			let renote: Note | undefined;
+
+			if (note.renoteId && note.text == null && !note.hasPoll && (note.fileIds == null || note.fileIds.length == 0)) {
+				renote = await Notes.findOne({
+					id: note.renoteId
+				});
+			}
+
+			const content = renderActivity(renote
+				? renderUndo(renderAnnounce(renote.uri || `${config.url}/notes/${renote.id}`, note), user)
+				: renderDelete(renderTombstone(`${config.url}/notes/${note.id}`), user));
 
 			const queue: string[] = [];