feat: Undo Accept (#7980)

* allow breaking of follow

* send undo

* delete by using reject follow

2 files changed, 30 insertions, 1 deletions

diff --git a/packages/backend/src/remote/activitypub/kernel/undo/accept.ts b/packages/backend/src/remote/activitypub/kernel/undo/accept.ts
new file mode 100644
index 0000000000..5112d1d4ea
--- /dev/null
+++ b/packages/backend/src/remote/activitypub/kernel/undo/accept.ts
@@ -0,0 +1,27 @@
+import unfollow from '@/services/following/delete';
+import cancelRequest from '@/services/following/requests/cancel';
+import {IAccept} from '../../type';
+import { IRemoteUser } from '@/models/entities/user';
+import { Followings } from '@/models/index';
+import DbResolver from '../../db-resolver';
+
+export default async (actor: IRemoteUser, activity: IAccept): Promise<string> => {
+	const dbResolver = new DbResolver();
+
+	const follower = await dbResolver.getUserFromApId(activity.object);
+	if (follower == null) {
+		return `skip: follower not found`;
+	}
+
+	const following = await Followings.findOne({
+		followerId: follower.id,
+		followeeId: actor.id
+	});
+
+	if (following) {
+		await unfollow(follower, actor);
+		return `ok: unfollowed`;
+	}
+
+	return `skip: フォローされていない`;
+};
diff --git a/packages/backend/src/remote/activitypub/kernel/undo/index.ts b/packages/backend/src/remote/activitypub/kernel/undo/index.ts
index 14b1add152..8de78420e3 100644
--- a/packages/backend/src/remote/activitypub/kernel/undo/index.ts
+++ b/packages/backend/src/remote/activitypub/kernel/undo/index.ts
@@ -1,8 +1,9 @@
 import { IRemoteUser } from '@/models/entities/user';
-import { IUndo, isFollow, isBlock, isLike, isAnnounce, getApType } from '../../type';
+import {IUndo, isFollow, isBlock, isLike, isAnnounce, getApType, isAccept} from '../../type';
 import unfollow from './follow';
 import unblock from './block';
 import undoLike from './like';
+import undoAccept from './accept';
 import { undoAnnounce } from './announce';
 import Resolver from '../../resolver';
 import { apLogger } from '../../logger';
@@ -29,6 +30,7 @@ export default async (actor: IRemoteUser, activity: IUndo): Promise<string> => {
 	if (isBlock(object)) return await unblock(actor, object);
 	if (isLike(object)) return await undoLike(actor, object);
 	if (isAnnounce(object)) return await undoAnnounce(actor, object);
+	if (isAccept(object)) return await undoAccept(actor, object);
 
 	return `skip: unknown object type ${getApType(object)}`;
 };