1 files changed, 69 insertions, 0 deletions
diff --git a/packages/backend/src/services/following/delete.ts b/packages/backend/src/services/following/delete.ts
new file mode 100644
index 0000000000..29e3372b6a
--- /dev/null
+++ b/packages/backend/src/services/following/delete.ts
@@ -0,0 +1,69 @@
+import { publishMainStream, publishUserEvent } from '@/services/stream';
+import { renderActivity } from '@/remote/activitypub/renderer/index';
+import renderFollow from '@/remote/activitypub/renderer/follow';
+import renderUndo from '@/remote/activitypub/renderer/undo';
+import { deliver } from '@/queue/index';
+import Logger from '../logger';
+import { registerOrFetchInstanceDoc } from '../register-or-fetch-instance-doc';
+import { User } from '@/models/entities/user';
+import { Followings, Users, Instances } from '@/models/index';
+import { instanceChart, perUserFollowingChart } from '@/services/chart/index';
+
+const logger = new Logger('following/delete');
+
+export default async function(follower: { id: User['id']; host: User['host']; uri: User['host']; inbox: User['inbox']; sharedInbox: User['sharedInbox']; }, followee: { id: User['id']; host: User['host']; uri: User['host']; inbox: User['inbox']; sharedInbox: User['sharedInbox']; }, silent = false) {
+	const following = await Followings.findOne({
+		followerId: follower.id,
+		followeeId: followee.id
+	});
+
+	if (following == null) {
+		logger.warn('フォロー解除がリクエストされましたがフォローしていませんでした');
+		return;
+	}
+
+	await Followings.delete(following.id);
+
+	decrementFollowing(follower, followee);
+
+	// Publish unfollow event
+	if (!silent && Users.isLocalUser(follower)) {
+		Users.pack(followee.id, follower, {
+			detail: true
+		}).then(packed => {
+			publishUserEvent(follower.id, 'unfollow', packed);
+			publishMainStream(follower.id, 'unfollow', packed);
+		});
+	}
+
+	if (Users.isLocalUser(follower) && Users.isRemoteUser(followee)) {
+		const content = renderActivity(renderUndo(renderFollow(follower, followee), follower));
+		deliver(follower, content, followee.inbox);
+	}
+}
+
+export async function decrementFollowing(follower: { id: User['id']; host: User['host']; }, followee: { id: User['id']; host: User['host']; }) {
+	//#region Decrement following count
+	Users.decrement({ id: follower.id }, 'followingCount', 1);
+	//#endregion
+
+	//#region Decrement followers count
+	Users.decrement({ id: followee.id }, 'followersCount', 1);
+	//#endregion
+
+	//#region Update instance stats
+	if (Users.isRemoteUser(follower) && Users.isLocalUser(followee)) {
+		registerOrFetchInstanceDoc(follower.host).then(i => {
+			Instances.decrement({ id: i.id }, 'followingCount', 1);
+			instanceChart.updateFollowing(i.host, false);
+		});
+	} else if (Users.isLocalUser(follower) && Users.isRemoteUser(followee)) {
+		registerOrFetchInstanceDoc(followee.host).then(i => {
+			Instances.decrement({ id: i.id }, 'followersCount', 1);
+			instanceChart.updateFollowers(i.host, false);
+		});
+	}
+	//#endregion
+
+	perUserFollowingChart.update(follower, followee, false);
+}