feat: チャンネルミュートの実装 (#14105)

* add channel_muting table and entities

* add channel_muting services

* タイムライン取得処理への組み込み

* misskey-jsの型とインターフェース生成

* Channelスキーマにミュート情報を追加

* フロントエンドの実装

* 条件が逆だったのを修正

* 期限切れミュートを掃除する機能を実装

* TLの抽出条件調節

* 名前の変更と変更不要の差分をロールバック

* 修正漏れ

* isChannelRelatedの条件に誤りがあった

* [wip] テスト追加

* テストの追加と検出した不備の修正

* fix test

* fix CHANGELOG.md

* 通常はFTTにしておく

* 実装忘れ対応

* fix merge

* fix merge

* add channel tl test

* fix CHANGELOG.md

* remove unused import

* fix lint

* fix test

* fix favorite -> favorited

* exclude -> include

* fix CHANGELOG.md

* fix CHANGELOG.md

* maintenance

* fix CHANGELOG.md

* fix

* fix ci

* regenerate

* fix

* Revert "fix"

This reverts commit 699d50c6ec798777d8e9667cb5d45a26b06bfc93.

* fixed

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

8 files changed, 416 insertions, 29 deletions

diff --git a/packages/backend/src/core/ChannelFollowingService.ts b/packages/backend/src/core/ChannelFollowingService.ts
index 12251595e2..d320a5ea36 100644
--- a/packages/backend/src/core/ChannelFollowingService.ts
+++ b/packages/backend/src/core/ChannelFollowingService.ts
@@ -6,7 +6,7 @@
 import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
 import Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
-import type { ChannelFollowingsRepository } from '@/models/_.js';
+import type { ChannelFollowingsRepository, ChannelsRepository, MiUser } from '@/models/_.js';
 import { MiChannel } from '@/models/_.js';
 import { IdService } from '@/core/IdService.js';
 import { GlobalEvents, GlobalEventService } from '@/core/GlobalEventService.js';
@@ -23,6 +23,8 @@ export class ChannelFollowingService implements OnModuleInit {
 		private redisClient: Redis.Redis,
 		@Inject(DI.redisForSub)
 		private redisForSub: Redis.Redis,
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
 		@Inject(DI.channelFollowingsRepository)
 		private channelFollowingsRepository: ChannelFollowingsRepository,
 		private idService: IdService,
@@ -45,6 +47,50 @@ export class ChannelFollowingService implements OnModuleInit {
 	onModuleInit() {
 	}
 
+	/**
+	 * フォローしているチャンネルの一覧を取得する.
+	 * @param params
+	 * @param [opts]
+	 * @param	{(boolean|undefined)} [opts.idOnly=false] チャンネルIDのみを取得するかどうか. ID以外のフィールドに値がセットされなくなり、他テーブルとのJOINも一切されなくなるので注意.
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルオーナーのユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinBannerFile=undefined] バナー画像のドライブファイルをJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	@bindThis
+	public async list(
+		params: {
+			requestUserId: MiUser['id'],
+		},
+		opts?: {
+			idOnly?: boolean;
+			joinUser?: boolean;
+			joinBannerFile?: boolean;
+		},
+	): Promise<MiChannel[]> {
+		if (opts?.idOnly) {
+			const q = this.channelFollowingsRepository.createQueryBuilder('channel_following')
+				.select('channel_following.followeeId')
+				.where('channel_following.followerId = :userId', { userId: params.requestUserId });
+
+			return q
+				.getRawMany<{ channel_following_followeeId: string }>()
+				.then(xs => xs.map(x => ({ id: x.channel_following_followeeId } as MiChannel)));
+		} else {
+			const q = this.channelsRepository.createQueryBuilder('channel')
+				.innerJoin('channel_following', 'channel_following', 'channel_following.followeeId = channel.id')
+				.where('channel_following.followerId = :userId', { userId: params.requestUserId });
+
+			if (opts?.joinUser) {
+				q.innerJoinAndSelect('channel.user', 'user');
+			}
+
+			if (opts?.joinBannerFile) {
+				q.leftJoinAndSelect('channel.banner', 'drive_file');
+			}
+
+			return q.getMany();
+		}
+	}
+
 	@bindThis
 	public async follow(
 		requestUser: MiLocalUser,
diff --git a/packages/backend/src/core/ChannelMutingService.ts b/packages/backend/src/core/ChannelMutingService.ts
new file mode 100644
index 0000000000..bf5b848d44
--- /dev/null
+++ b/packages/backend/src/core/ChannelMutingService.ts
@@ -0,0 +1,224 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import Redis from 'ioredis';
+import { Brackets, In } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import type { ChannelMutingRepository, ChannelsRepository, MiChannel, MiChannelMuting, MiUser } from '@/models/_.js';
+import { IdService } from '@/core/IdService.js';
+import { GlobalEvents, GlobalEventService } from '@/core/GlobalEventService.js';
+import { bindThis } from '@/decorators.js';
+import { RedisKVCache } from '@/misc/cache.js';
+
+@Injectable()
+export class ChannelMutingService {
+	public mutingChannelsCache: RedisKVCache<Set<string>>;
+
+	constructor(
+		@Inject(DI.redis)
+		private redisClient: Redis.Redis,
+		@Inject(DI.redisForSub)
+		private redisForSub: Redis.Redis,
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
+		@Inject(DI.channelMutingRepository)
+		private channelMutingRepository: ChannelMutingRepository,
+		private idService: IdService,
+		private globalEventService: GlobalEventService,
+	) {
+		this.mutingChannelsCache = new RedisKVCache<Set<string>>(this.redisClient, 'channelMutingChannels', {
+			lifetime: 1000 * 60 * 30, // 30m
+			memoryCacheLifetime: 1000 * 60, // 1m
+			fetcher: (userId) => this.channelMutingRepository.find({
+				where: { userId: userId },
+				select: ['channelId'],
+			}).then(xs => new Set(xs.map(x => x.channelId))),
+			toRedisConverter: (value) => JSON.stringify(Array.from(value)),
+			fromRedisConverter: (value) => new Set(JSON.parse(value)),
+		});
+
+		this.redisForSub.on('message', this.onMessage);
+	}
+
+	/**
+	 * ミュートしているチャンネルの一覧を取得する.
+	 * @param params
+	 * @param [opts]
+	 * @param	{(boolean|undefined)} [opts.idOnly=false] チャンネルIDのみを取得するかどうか. ID以外のフィールドに値がセットされなくなり、他テーブルとのJOINも一切されなくなるので注意.
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルオーナーのユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinBannerFile=undefined] バナー画像のドライブファイルをJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	@bindThis
+	public async list(
+		params: {
+			requestUserId: MiUser['id'],
+		},
+		opts?: {
+			idOnly?: boolean;
+			joinUser?: boolean;
+			joinBannerFile?: boolean;
+		},
+	): Promise<MiChannel[]> {
+		if (opts?.idOnly) {
+			const q = this.channelMutingRepository.createQueryBuilder('channel_muting')
+				.select('channel_muting.channelId')
+				.where('channel_muting.userId = :userId', { userId: params.requestUserId })
+				.andWhere(new Brackets(qb => {
+					qb.where('channel_muting.expiresAt IS NULL')
+						.orWhere('channel_muting.expiresAt > :now', { now: new Date() });
+				}));
+
+			return q
+				.getRawMany<{ channel_muting_channelId: string }>()
+				.then(xs => xs.map(x => ({ id: x.channel_muting_channelId } as MiChannel)));
+		} else {
+			const q = this.channelsRepository.createQueryBuilder('channel')
+				.innerJoin('channel_muting', 'channel_muting', 'channel_muting.channelId = channel.id')
+				.where('channel_muting.userId = :userId', { userId: params.requestUserId })
+				.andWhere(new Brackets(qb => {
+					qb.where('channel_muting.expiresAt IS NULL')
+						.orWhere('channel_muting.expiresAt > :now', { now: new Date() });
+				}));
+
+			if (opts?.joinUser) {
+				q.innerJoinAndSelect('channel.user', 'user');
+			}
+
+			if (opts?.joinBannerFile) {
+				q.leftJoinAndSelect('channel.banner', 'drive_file');
+			}
+
+			return q.getMany();
+		}
+	}
+
+	/**
+	 * 期限切れのチャンネルミュート情報を取得する.
+	 *
+	 * @param [opts]
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルミュートを設定したユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinChannel=undefined] ミュート先のチャンネル情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	public async findExpiredMutings(opts?: {
+		joinUser?: boolean;
+		joinChannel?: boolean;
+	}): Promise<MiChannelMuting[]> {
+		const now = new Date();
+		const q = this.channelMutingRepository.createQueryBuilder('channel_muting')
+			.where('channel_muting.expiresAt < :now', { now });
+
+		if (opts?.joinUser) {
+			q.innerJoinAndSelect('channel_muting.user', 'user');
+		}
+
+		if (opts?.joinChannel) {
+			q.leftJoinAndSelect('channel_muting.channel', 'channel');
+		}
+
+		return q.getMany();
+	}
+
+	/**
+	 * 既にミュートされているかどうかをキャッシュから取得する.
+	 * @param params
+	 * @param params.requestUserId
+	 */
+	@bindThis
+	public async isMuted(params: {
+		requestUserId: MiUser['id'],
+		targetChannelId: MiChannel['id'],
+	}): Promise<boolean> {
+		const mutedChannels = await this.mutingChannelsCache.get(params.requestUserId);
+		return (mutedChannels?.has(params.targetChannelId) ?? false);
+	}
+
+	/**
+	 * チャンネルをミュートする.
+	 * @param params
+	 * @param {(Date|null|undefined)} [params.expiresAt] ミュートの有効期限. nullまたは省略時は無期限.
+	 */
+	@bindThis
+	public async mute(params: {
+		requestUserId: MiUser['id'],
+		targetChannelId: MiChannel['id'],
+		expiresAt?: Date | null,
+	}): Promise<void> {
+		await this.channelMutingRepository.insert({
+			id: this.idService.gen(),
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+			expiresAt: params.expiresAt,
+		});
+
+		this.globalEventService.publishInternalEvent('muteChannel', {
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+		});
+	}
+
+	/**
+	 * チャンネルのミュートを解除する.
+	 * @param params
+	 */
+	@bindThis
+	public async unmute(params: {
+		requestUserId: MiUser['id'],
+		targetChannelId: MiChannel['id'],
+	}): Promise<void> {
+		await this.channelMutingRepository.delete({
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+		});
+
+		this.globalEventService.publishInternalEvent('unmuteChannel', {
+			userId: params.requestUserId,
+			channelId: params.targetChannelId,
+		});
+	}
+
+	/**
+	 * 期限切れのチャンネルミュート情報を削除する.
+	 */
+	@bindThis
+	public async eraseExpiredMutings(): Promise<void> {
+		const expiredMutings = await this.findExpiredMutings();
+		await this.channelMutingRepository.delete({ id: In(expiredMutings.map(x => x.id)) });
+
+		const userIds = [...new Set(expiredMutings.map(x => x.userId))];
+		for (const userId of userIds) {
+			this.mutingChannelsCache.refresh(userId).then();
+		}
+	}
+
+	@bindThis
+	private async onMessage(_: string, data: string): Promise<void> {
+		const obj = JSON.parse(data);
+
+		if (obj.channel === 'internal') {
+			const { type, body } = obj.message as GlobalEvents['internal']['payload'];
+			switch (type) {
+				case 'muteChannel': {
+					this.mutingChannelsCache.refresh(body.userId).then();
+					break;
+				}
+				case 'unmuteChannel': {
+					this.mutingChannelsCache.delete(body.userId).then();
+					break;
+				}
+			}
+		}
+	}
+
+	@bindThis
+	public dispose(): void {
+		this.mutingChannelsCache.dispose();
+	}
+
+	@bindThis
+	public onApplicationShutdown(signal?: string | undefined): void {
+		this.dispose();
+	}
+}
diff --git a/packages/backend/src/core/CoreModule.ts b/packages/backend/src/core/CoreModule.ts
index a30bff0fe4..8c8d22c77d 100644
--- a/packages/backend/src/core/CoreModule.ts
+++ b/packages/backend/src/core/CoreModule.ts
@@ -15,6 +15,7 @@ import { SystemWebhookService } from '@/core/SystemWebhookService.js';
 import { UserSearchService } from '@/core/UserSearchService.js';
 import { WebhookTestService } from '@/core/WebhookTestService.js';
 import { FlashService } from '@/core/FlashService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { AccountMoveService } from './AccountMoveService.js';
 import { AccountUpdateService } from './AccountUpdateService.js';
 import { AiService } from './AiService.js';
@@ -225,6 +226,7 @@ const $FeaturedService: Provider = { provide: 'FeaturedService', useExisting: Fe
 const $FanoutTimelineService: Provider = { provide: 'FanoutTimelineService', useExisting: FanoutTimelineService };
 const $FanoutTimelineEndpointService: Provider = { provide: 'FanoutTimelineEndpointService', useExisting: FanoutTimelineEndpointService };
 const $ChannelFollowingService: Provider = { provide: 'ChannelFollowingService', useExisting: ChannelFollowingService };
+const $ChannelMutingService: Provider = { provide: 'ChannelMutingService', useExisting: ChannelMutingService };
 const $ChatService: Provider = { provide: 'ChatService', useExisting: ChatService };
 const $RegistryApiService: Provider = { provide: 'RegistryApiService', useExisting: RegistryApiService };
 const $ReversiService: Provider = { provide: 'ReversiService', useExisting: ReversiService };
@@ -378,6 +380,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		FanoutTimelineService,
 		FanoutTimelineEndpointService,
 		ChannelFollowingService,
+		ChannelMutingService,
 		ChatService,
 		RegistryApiService,
 		ReversiService,
@@ -527,6 +530,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$FanoutTimelineService,
 		$FanoutTimelineEndpointService,
 		$ChannelFollowingService,
+		$ChannelMutingService,
 		$ChatService,
 		$RegistryApiService,
 		$ReversiService,
@@ -677,6 +681,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		FanoutTimelineService,
 		FanoutTimelineEndpointService,
 		ChannelFollowingService,
+		ChannelMutingService,
 		ChatService,
 		RegistryApiService,
 		ReversiService,
@@ -824,6 +829,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$FanoutTimelineService,
 		$FanoutTimelineEndpointService,
 		$ChannelFollowingService,
+		$ChannelMutingService,
 		$ChatService,
 		$RegistryApiService,
 		$ReversiService,
diff --git a/packages/backend/src/core/FanoutTimelineEndpointService.ts b/packages/backend/src/core/FanoutTimelineEndpointService.ts
index 94c5691bf4..e39d70d683 100644
--- a/packages/backend/src/core/FanoutTimelineEndpointService.ts
+++ b/packages/backend/src/core/FanoutTimelineEndpointService.ts
@@ -19,6 +19,8 @@ import { isQuote, isRenote } from '@/misc/is-renote.js';
 import { CacheService } from '@/core/CacheService.js';
 import { isReply } from '@/misc/is-reply.js';
 import { isInstanceMuted } from '@/misc/is-instance-muted.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
+import { isChannelRelated } from '@/misc/is-channel-related.js';
 
 type NoteFilter = (note: MiNote) => boolean;
 
@@ -35,6 +37,7 @@ type TimelineOptions = {
 	ignoreAuthorFromBlock?: boolean;
 	ignoreAuthorFromMute?: boolean;
 	ignoreAuthorFromInstanceBlock?: boolean;
+	ignoreAuthorChannelFromMute?: boolean;
 	excludeNoFiles?: boolean;
 	excludeReplies?: boolean;
 	excludePureRenotes: boolean;
@@ -55,6 +58,7 @@ export class FanoutTimelineEndpointService {
 		private cacheService: CacheService,
 		private fanoutTimelineService: FanoutTimelineService,
 		private utilityService: UtilityService,
+		private channelMutingService: ChannelMutingService,
 	) {
 	}
 
@@ -111,11 +115,13 @@ export class FanoutTimelineEndpointService {
 					userIdsWhoMeMutingRenotes,
 					userIdsWhoBlockingMe,
 					userMutedInstances,
+					userMutedChannels,
 				] = await Promise.all([
 					this.cacheService.userMutingsCache.fetch(ps.me.id),
 					this.cacheService.renoteMutingsCache.fetch(ps.me.id),
 					this.cacheService.userBlockedCache.fetch(ps.me.id),
 					this.cacheService.userProfileCache.fetch(me.id).then(p => new Set(p.mutedInstances)),
+					this.channelMutingService.mutingChannelsCache.fetch(me.id),
 				]);
 
 				const parentFilter = filter;
@@ -126,6 +132,7 @@ export class FanoutTimelineEndpointService {
 					if (isUserRelated(note.renote, userIdsWhoMeMuting, ps.ignoreAuthorFromMute)) return false;
 					if (!ps.ignoreAuthorFromMute && isRenote(note) && !isQuote(note) && userIdsWhoMeMutingRenotes.has(note.userId)) return false;
 					if (isInstanceMuted(note, userMutedInstances)) return false;
+					if (isChannelRelated(note, userMutedChannels, ps.ignoreAuthorChannelFromMute)) return false;
 
 					return parentFilter(note);
 				};
diff --git a/packages/backend/src/core/GlobalEventService.ts b/packages/backend/src/core/GlobalEventService.ts
index 3215b41c8d..f4c747b139 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -255,6 +255,8 @@ export interface InternalEventTypes {
 	metaUpdated: { before?: MiMeta; after: MiMeta; };
 	followChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
 	unfollowChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
+	muteChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
+	unmuteChannel: { userId: MiUser['id']; channelId: MiChannel['id']; };
 	updateUserProfile: MiUserProfile;
 	mute: { muterId: MiUser['id']; muteeId: MiUser['id']; };
 	unmute: { muterId: MiUser['id']; muteeId: MiUser['id']; };
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index b6acf4c5fb..748f2cbad9 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -604,6 +604,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 			replyUserHost: data.reply ? data.reply.userHost : null,
 			renoteUserId: data.renote ? data.renote.userId : null,
 			renoteUserHost: data.renote ? data.renote.userHost : null,
+			renoteChannelId: data.renote ? data.renote.channelId : null,
 			userHost: user.host,
 		});
 
diff --git a/packages/backend/src/core/WebhookTestService.ts b/packages/backend/src/core/WebhookTestService.ts
index 6714bda9a9..b112912b1b 100644
--- a/packages/backend/src/core/WebhookTestService.ts
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -106,6 +106,7 @@ function generateDummyNote(override?: Partial<MiNote>): MiNote {
 		replyUserHost: null,
 		renoteUserId: null,
 		renoteUserHost: null,
+		renoteChannelId: null,
 		...override,
 	};
 }
diff --git a/packages/backend/src/core/entities/ChannelEntityService.ts b/packages/backend/src/core/entities/ChannelEntityService.ts
index 1ba7ca8e57..9ee918bea3 100644
--- a/packages/backend/src/core/entities/ChannelEntityService.ts
+++ b/packages/backend/src/core/entities/ChannelEntityService.ts
@@ -4,36 +4,40 @@
  */
 
 import { Inject, Injectable } from '@nestjs/common';
+import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { ChannelFavoritesRepository, ChannelFollowingsRepository, ChannelsRepository, DriveFilesRepository, NotesRepository } from '@/models/_.js';
+import type {
+	ChannelFavoritesRepository,
+	ChannelFollowingsRepository, ChannelMutingRepository,
+	ChannelsRepository,
+	DriveFilesRepository,
+	MiDriveFile,
+	MiNote,
+	NotesRepository,
+} from '@/models/_.js';
 import type { Packed } from '@/misc/json-schema.js';
-import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiChannel } from '@/models/Channel.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
 import { DriveFileEntityService } from './DriveFileEntityService.js';
 import { NoteEntityService } from './NoteEntityService.js';
-import { In } from 'typeorm';
 
 @Injectable()
 export class ChannelEntityService {
 	constructor(
 		@Inject(DI.channelsRepository)
 		private channelsRepository: ChannelsRepository,
-
 		@Inject(DI.channelFollowingsRepository)
 		private channelFollowingsRepository: ChannelFollowingsRepository,
-
 		@Inject(DI.channelFavoritesRepository)
 		private channelFavoritesRepository: ChannelFavoritesRepository,
-
+		@Inject(DI.channelMutingRepository)
+		private channelMutingRepository: ChannelMutingRepository,
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
-
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,
-
 		private noteEntityService: NoteEntityService,
 		private driveFileEntityService: DriveFileEntityService,
 		private idService: IdService,
@@ -45,31 +49,59 @@ export class ChannelEntityService {
 		src: MiChannel['id'] | MiChannel,
 		me?: { id: MiUser['id'] } | null | undefined,
 		detailed?: boolean,
+		opts?: {
+			bannerFiles?: Map<MiDriveFile['id'], MiDriveFile>;
+			followings?: Set<MiChannel['id']>;
+			favorites?: Set<MiChannel['id']>;
+			muting?: Set<MiChannel['id']>;
+			pinnedNotes?: Map<MiNote['id'], MiNote>;
+		},
 	): Promise<Packed<'Channel'>> {
 		const channel = typeof src === 'object' ? src : await this.channelsRepository.findOneByOrFail({ id: src });
-		const meId = me ? me.id : null;
 
-		const banner = channel.bannerId ? await this.driveFilesRepository.findOneBy({ id: channel.bannerId }) : null;
+		let bannerFile: MiDriveFile | null = null;
+		if (channel.bannerId) {
+			bannerFile = opts?.bannerFiles?.get(channel.bannerId)
+				?? await this.driveFilesRepository.findOneByOrFail({ id: channel.bannerId });
+		}
+
+		let isFollowing = false;
+		let isFavorited = false;
+		let isMuting = false;
+		if (me) {
+			isFollowing = opts?.followings?.has(channel.id) ?? await this.channelFollowingsRepository.exists({
+				where: {
+					followerId: me.id,
+					followeeId: channel.id,
+				},
+			});
 
-		const isFollowing = meId ? await this.channelFollowingsRepository.exists({
-			where: {
-				followerId: meId,
-				followeeId: channel.id,
-			},
-		}) : false;
+			isFavorited = opts?.favorites?.has(channel.id) ?? await this.channelFavoritesRepository.exists({
+				where: {
+					userId: me.id,
+					channelId: channel.id,
+				},
+			});
 
-		const isFavorited = meId ? await this.channelFavoritesRepository.exists({
-			where: {
-				userId: meId,
-				channelId: channel.id,
-			},
-		}) : false;
+			isMuting = opts?.muting?.has(channel.id) ?? await this.channelMutingRepository.exists({
+				where: {
+					userId: me.id,
+					channelId: channel.id,
+				},
+			});
+		}
 
-		const pinnedNotes = channel.pinnedNoteIds.length > 0 ? await this.notesRepository.find({
-			where: {
-				id: In(channel.pinnedNoteIds),
-			},
-		}) : [];
+		const pinnedNotes = Array.of<MiNote>();
+		if (channel.pinnedNoteIds.length > 0) {
+			pinnedNotes.push(
+				...(
+					opts?.pinnedNotes
+						// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+						? channel.pinnedNoteIds.map(it => opts.pinnedNotes!.get(it)).filter(it => it != null)
+						: await this.notesRepository.findBy({ id: In(channel.pinnedNoteIds) })
+				),
+			);
+		}
 
 		return {
 			id: channel.id,
@@ -78,7 +110,7 @@ export class ChannelEntityService {
 			name: channel.name,
 			description: channel.description,
 			userId: channel.userId,
-			bannerUrl: banner ? this.driveFileEntityService.getPublicUrl(banner) : null,
+			bannerUrl: bannerFile ? this.driveFileEntityService.getPublicUrl(bannerFile) : null,
 			pinnedNoteIds: channel.pinnedNoteIds,
 			color: channel.color,
 			isArchived: channel.isArchived,
@@ -90,6 +122,7 @@ export class ChannelEntityService {
 			...(me ? {
 				isFollowing,
 				isFavorited,
+				isMuting,
 				hasUnreadNote: false, // 後方互換性のため
 			} : {}),
 
@@ -98,5 +131,72 @@ export class ChannelEntityService {
 			} : {}),
 		};
 	}
+
+	@bindThis
+	public async packMany(
+		src: MiChannel['id'][] | MiChannel[],
+		me?: { id: MiUser['id'] } | null | undefined,
+		detailed?: boolean,
+	): Promise<Packed<'Channel'>[]> {
+		// IDのみの要素がある場合、DBからオブジェクトを取得して補う
+		const channels = src.filter(it => typeof it === 'object') as MiChannel[];
+		channels.push(
+			...(await this.channelsRepository.find({
+				where: {
+					id: In(src.filter(it => typeof it !== 'object') as MiChannel['id'][]),
+				},
+			})),
+		);
+		channels.sort((a, b) => a.id.localeCompare(b.id));
+
+		const bannerFiles = await this.driveFilesRepository
+			.findBy({
+				id: In(channels.map(it => it.bannerId).filter(it => it != null)),
+			})
+			.then(it => new Map(it.map(it => [it.id, it])));
+
+		const followings = me
+			? await this.channelFollowingsRepository
+				.findBy({
+					followerId: me.id,
+					followeeId: In(channels.map(it => it.id)),
+				})
+				.then(it => new Set(it.map(it => it.followeeId)))
+			: new Set<MiChannel['id']>();
+
+		const favorites = me
+			? await this.channelFavoritesRepository
+				.findBy({
+					userId: me.id,
+					channelId: In(channels.map(it => it.id)),
+				})
+				.then(it => new Set(it.map(it => it.channelId)))
+			: new Set<MiChannel['id']>();
+
+		const muting = me
+			? await this.channelMutingRepository
+				.findBy({
+					userId: me.id,
+					channelId: In(channels.map(it => it.id)),
+				})
+				.then(it => new Set(it.map(it => it.channelId)))
+			: new Set<MiChannel['id']>();
+
+		const pinnedNotes = await this.notesRepository
+			.find({
+				where: {
+					id: In(channels.flatMap(it => it.pinnedNoteIds)),
+				},
+			})
+			.then(it => new Map(it.map(it => [it.id, it])));
+
+		return Promise.all(channels.map(it => this.pack(it, me, detailed, {
+			bannerFiles,
+			followings,
+			favorites,
+			muting,
+			pinnedNotes,
+		})));
+	}
 }