Channel (#6621)

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* add notes

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* add kick_gaba2

* wip

25 files changed, 624 insertions, 12 deletions

diff --git a/src/server/api/common/generate-channel-query.ts b/src/server/api/common/generate-channel-query.ts
new file mode 100644
index 0000000000..c0337b2c6b
--- /dev/null
+++ b/src/server/api/common/generate-channel-query.ts
@@ -0,0 +1,24 @@
+import { User } from '../../../models/entities/user';
+import { ChannelFollowings } from '../../../models';
+import { Brackets, SelectQueryBuilder } from 'typeorm';
+
+export function generateChannelQuery(q: SelectQueryBuilder<any>, me?: User | null) {
+	if (me == null) {
+		q.andWhere('note.channelId IS NULL');
+	} else {
+		q.leftJoinAndSelect('note.channel', 'channel');
+
+		const channelFollowingQuery = ChannelFollowings.createQueryBuilder('channelFollowing')
+			.select('channelFollowing.followeeId')
+			.where('channelFollowing.followerId = :followerId', { followerId: me.id });
+
+		q.andWhere(new Brackets(qb => { qb
+			// チャンネルのノートではない
+			.where('note.channelId IS NULL')
+			// または自分がフォローしているチャンネルのノート
+			.orWhere(`note.channelId IN (${ channelFollowingQuery.getQuery() })`);
+		}));
+
+		q.setParameters(channelFollowingQuery.getParameters());
+	}
+}
diff --git a/src/server/api/endpoints/channels/create.ts b/src/server/api/endpoints/channels/create.ts
new file mode 100644
index 0000000000..53436e703d
--- /dev/null
+++ b/src/server/api/endpoints/channels/create.ts
@@ -0,0 +1,68 @@
+import $ from 'cafy';
+import define from '../../define';
+import { ApiError } from '../../error';
+import { Channels, DriveFiles } from '../../../../models';
+import { Channel } from '../../../../models/entities/channel';
+import { genId } from '../../../../misc/gen-id';
+import { ID } from '../../../../misc/cafy-id';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: true as const,
+
+	kind: 'write:channels',
+
+	params: {
+		name: {
+			validator: $.str.range(1, 128)
+		},
+
+		description: {
+			validator: $.nullable.optional.str.range(1, 2048)
+		},
+
+		bannerId: {
+			validator: $.nullable.optional.type(ID),
+		}
+	},
+
+	res: {
+		type: 'object' as const,
+		optional: false as const, nullable: false as const,
+		ref: 'Channel',
+	},
+
+	errors: {
+		noSuchFile: {
+			message: 'No such file.',
+			code: 'NO_SUCH_FILE',
+			id: 'cd1e9f3e-5a12-4ab4-96f6-5d0a2cc32050'
+		},
+	}
+};
+
+export default define(meta, async (ps, user) => {
+	let banner = null;
+	if (ps.bannerId != null) {
+		banner = await DriveFiles.findOne({
+			id: ps.bannerId,
+			userId: user.id
+		});
+
+		if (banner == null) {
+			throw new ApiError(meta.errors.noSuchFile);
+		}
+	}
+
+	const channel = await Channels.save({
+		id: genId(),
+		createdAt: new Date(),
+		userId: user.id,
+		name: ps.name,
+		description: ps.description || null,
+		bannerId: banner ? banner.id : null,
+	} as Channel);
+
+	return await Channels.pack(channel, user);
+});
diff --git a/src/server/api/endpoints/channels/featured.ts b/src/server/api/endpoints/channels/featured.ts
new file mode 100644
index 0000000000..abb0a19e2d
--- /dev/null
+++ b/src/server/api/endpoints/channels/featured.ts
@@ -0,0 +1,28 @@
+import define from '../../define';
+import { Channels } from '../../../../models';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: false as const,
+
+	res: {
+		type: 'array' as const,
+		optional: false as const, nullable: false as const,
+		items: {
+			type: 'object' as const,
+			optional: false as const, nullable: false as const,
+			ref: 'Channel',
+		}
+	},
+};
+
+export default define(meta, async (ps, me) => {
+	const query = Channels.createQueryBuilder('channel')
+		.where('channel.lastNotedAt IS NOT NULL')
+		.orderBy('channel.lastNotedAt', 'DESC');
+
+	const channels = await query.take(10).getMany();
+
+	return await Promise.all(channels.map(x => Channels.pack(x, me)));
+});
diff --git a/src/server/api/endpoints/channels/follow.ts b/src/server/api/endpoints/channels/follow.ts
new file mode 100644
index 0000000000..bf2f2bbb57
--- /dev/null
+++ b/src/server/api/endpoints/channels/follow.ts
@@ -0,0 +1,45 @@
+import $ from 'cafy';
+import { ID } from '../../../../misc/cafy-id';
+import define from '../../define';
+import { ApiError } from '../../error';
+import { Channels, ChannelFollowings } from '../../../../models';
+import { genId } from '../../../../misc/gen-id';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: true as const,
+
+	kind: 'write:channels',
+
+	params: {
+		channelId: {
+			validator: $.type(ID),
+		},
+	},
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: 'c0031718-d573-4e85-928e-10039f1fbb68'
+		},
+	}
+};
+
+export default define(meta, async (ps, user) => {
+	const channel = await Channels.findOne({
+		id: ps.channelId,
+	});
+
+	if (channel == null) {
+		throw new ApiError(meta.errors.noSuchChannel);
+	}
+
+	await ChannelFollowings.save({
+		id: genId(),
+		createdAt: new Date(),
+		followerId: user.id,
+		followeeId: channel.id,
+	});
+});
diff --git a/src/server/api/endpoints/channels/followed.ts b/src/server/api/endpoints/channels/followed.ts
new file mode 100644
index 0000000000..05c2ec6a75
--- /dev/null
+++ b/src/server/api/endpoints/channels/followed.ts
@@ -0,0 +1,28 @@
+import define from '../../define';
+import { Channels, ChannelFollowings } from '../../../../models';
+
+export const meta = {
+	tags: ['channels', 'account'],
+
+	requireCredential: true as const,
+
+	kind: 'read:channels',
+
+	res: {
+		type: 'array' as const,
+		optional: false as const, nullable: false as const,
+		items: {
+			type: 'object' as const,
+			optional: false as const, nullable: false as const,
+			ref: 'Channel',
+		}
+	},
+};
+
+export default define(meta, async (ps, me) => {
+	const followings = await ChannelFollowings.find({
+		followerId: me.id,
+	});
+
+	return await Promise.all(followings.map(x => Channels.pack(x.followeeId, me)));
+});
diff --git a/src/server/api/endpoints/channels/owned.ts b/src/server/api/endpoints/channels/owned.ts
new file mode 100644
index 0000000000..9e563c0ac5
--- /dev/null
+++ b/src/server/api/endpoints/channels/owned.ts
@@ -0,0 +1,28 @@
+import define from '../../define';
+import { Channels } from '../../../../models';
+
+export const meta = {
+	tags: ['channels', 'account'],
+
+	requireCredential: true as const,
+
+	kind: 'read:channels',
+
+	res: {
+		type: 'array' as const,
+		optional: false as const, nullable: false as const,
+		items: {
+			type: 'object' as const,
+			optional: false as const, nullable: false as const,
+			ref: 'Channel',
+		}
+	},
+};
+
+export default define(meta, async (ps, me) => {
+	const channels = await Channels.find({
+		userId: me.id,
+	});
+
+	return await Promise.all(channels.map(x => Channels.pack(x, me)));
+});
diff --git a/src/server/api/endpoints/channels/pin-note.ts b/src/server/api/endpoints/channels/pin-note.ts
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/src/server/api/endpoints/channels/pin-note.ts
diff --git a/src/server/api/endpoints/channels/show.ts b/src/server/api/endpoints/channels/show.ts
new file mode 100644
index 0000000000..63057dd57f
--- /dev/null
+++ b/src/server/api/endpoints/channels/show.ts
@@ -0,0 +1,43 @@
+import $ from 'cafy';
+import { ID } from '../../../../misc/cafy-id';
+import define from '../../define';
+import { ApiError } from '../../error';
+import { Channels } from '../../../../models';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: false as const,
+
+	params: {
+		channelId: {
+			validator: $.type(ID),
+		},
+	},
+
+	res: {
+		type: 'object' as const,
+		optional: false as const, nullable: false as const,
+		ref: 'Channel',
+	},
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: '6f6c314b-7486-4897-8966-c04a66a02923'
+		},
+	}
+};
+
+export default define(meta, async (ps, me) => {
+	const channel = await Channels.findOne({
+		id: ps.channelId,
+	});
+
+	if (channel == null) {
+		throw new ApiError(meta.errors.noSuchChannel);
+	}
+
+	return await Channels.pack(channel, me);
+});
diff --git a/src/server/api/endpoints/channels/timeline.ts b/src/server/api/endpoints/channels/timeline.ts
new file mode 100644
index 0000000000..3ae28fc67a
--- /dev/null
+++ b/src/server/api/endpoints/channels/timeline.ts
@@ -0,0 +1,99 @@
+import $ from 'cafy';
+import { ID } from '../../../../misc/cafy-id';
+import define from '../../define';
+import { ApiError } from '../../error';
+import { Notes, Channels } from '../../../../models';
+import { makePaginationQuery } from '../../common/make-pagination-query';
+import { activeUsersChart } from '../../../../services/chart';
+
+export const meta = {
+	tags: ['notes', 'channels'],
+
+	requireCredential: false as const,
+
+	params: {
+		channelId: {
+			validator: $.type(ID),
+			desc: {
+				'ja-JP': 'チャンネルのID'
+			}
+		},
+
+		limit: {
+			validator: $.optional.num.range(1, 100),
+			default: 10,
+			desc: {
+				'ja-JP': '最大数'
+			}
+		},
+
+		sinceId: {
+			validator: $.optional.type(ID),
+			desc: {
+				'ja-JP': '指定すると、その投稿を基点としてより新しい投稿を取得します'
+			}
+		},
+
+		untilId: {
+			validator: $.optional.type(ID),
+			desc: {
+				'ja-JP': '指定すると、その投稿を基点としてより古い投稿を取得します'
+			}
+		},
+
+		sinceDate: {
+			validator: $.optional.num,
+			desc: {
+				'ja-JP': '指定した時間を基点としてより新しい投稿を取得します。数値は、1970年1月1日 00:00:00 UTC から指定した日時までの経過時間をミリ秒単位で表します。'
+			}
+		},
+
+		untilDate: {
+			validator: $.optional.num,
+			desc: {
+				'ja-JP': '指定した時間を基点としてより古い投稿を取得します。数値は、1970年1月1日 00:00:00 UTC から指定した日時までの経過時間をミリ秒単位で表します。'
+			}
+		},
+	},
+
+	res: {
+		type: 'array' as const,
+		optional: false as const, nullable: false as const,
+		items: {
+			type: 'object' as const,
+			optional: false as const, nullable: false as const,
+			ref: 'Note',
+		}
+	},
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: '4d0eeeba-a02c-4c3c-9966-ef60d38d2e7f'
+		}
+	}
+};
+
+export default define(meta, async (ps, user) => {
+	const channel = await Channels.findOne({
+		id: ps.channelId,
+	});
+
+	if (channel == null) {
+		throw new ApiError(meta.errors.noSuchChannel);
+	}
+
+	//#region Construct query
+	const query = makePaginationQuery(Notes.createQueryBuilder('note'), ps.sinceId, ps.untilId)
+		.andWhere('note.channelId = :channelId', { channelId: channel.id })
+		.leftJoinAndSelect('note.user', 'user')
+		.leftJoinAndSelect('note.channel', 'channel');
+	//#endregion
+
+	const timeline = await query.take(ps.limit!).getMany();
+
+	activeUsersChart.update(user);
+
+	return await Notes.packMany(timeline, user);
+});
diff --git a/src/server/api/endpoints/channels/unfollow.ts b/src/server/api/endpoints/channels/unfollow.ts
new file mode 100644
index 0000000000..8cab5c36a6
--- /dev/null
+++ b/src/server/api/endpoints/channels/unfollow.ts
@@ -0,0 +1,42 @@
+import $ from 'cafy';
+import { ID } from '../../../../misc/cafy-id';
+import define from '../../define';
+import { ApiError } from '../../error';
+import { Channels, ChannelFollowings } from '../../../../models';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: true as const,
+
+	kind: 'write:channels',
+
+	params: {
+		channelId: {
+			validator: $.type(ID),
+		},
+	},
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: '19959ee9-0153-4c51-bbd9-a98c49dc59d6'
+		},
+	}
+};
+
+export default define(meta, async (ps, user) => {
+	const channel = await Channels.findOne({
+		id: ps.channelId,
+	});
+
+	if (channel == null) {
+		throw new ApiError(meta.errors.noSuchChannel);
+	}
+
+	await ChannelFollowings.delete({
+		followerId: user.id,
+		followeeId: channel.id,
+	});
+});
diff --git a/src/server/api/endpoints/channels/update.ts b/src/server/api/endpoints/channels/update.ts
new file mode 100644
index 0000000000..8b94646ad1
--- /dev/null
+++ b/src/server/api/endpoints/channels/update.ts
@@ -0,0 +1,93 @@
+import $ from 'cafy';
+import { ID } from '../../../../misc/cafy-id';
+import define from '../../define';
+import { ApiError } from '../../error';
+import { Channels, DriveFiles } from '../../../../models';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: true as const,
+
+	kind: 'write:channels',
+
+	params: {
+		channelId: {
+			validator: $.type(ID),
+		},
+
+		name: {
+			validator: $.optional.str.range(1, 128)
+		},
+
+		description: {
+			validator: $.nullable.optional.str.range(1, 2048)
+		},
+
+		bannerId: {
+			validator: $.nullable.optional.type(ID),
+		}
+	},
+
+	res: {
+		type: 'object' as const,
+		optional: false as const, nullable: false as const,
+		ref: 'Channel',
+	},
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: 'f9c5467f-d492-4c3c-9a8d-a70dacc86512'
+		},
+
+		accessDenied: {
+			message: 'You do not have edit privilege of the channel.',
+			code: 'ACCESS_DENIED',
+			id: '1fb7cb09-d46a-4fdf-b8df-057788cce513'
+		},
+
+		noSuchFile: {
+			message: 'No such file.',
+			code: 'NO_SUCH_FILE',
+			id: 'e86c14a4-0da2-4032-8df3-e737a04c7f3b'
+		},
+	}
+};
+
+export default define(meta, async (ps, me) => {
+	const channel = await Channels.findOne({
+		id: ps.channelId,
+	});
+
+	if (channel == null) {
+		throw new ApiError(meta.errors.noSuchChannel);
+	}
+
+	if (channel.userId !== me.id) {
+		throw new ApiError(meta.errors.accessDenied);
+	}
+
+	let banner = undefined;
+	if (ps.bannerId != null) {
+		banner = await DriveFiles.findOne({
+			id: ps.bannerId,
+			userId: me.id
+		});
+
+		if (banner == null) {
+			throw new ApiError(meta.errors.noSuchFile);
+		}
+	} else if (ps.bannerId === null) {
+		banner = null;
+	}
+
+	await Channels.update(channel.id, {
+		...(ps.name !== undefined ? { name: ps.name } : {}),
+		...(ps.description !== undefined ? { description: ps.description } : {}),
+		...(banner ? { bannerId: banner.id } : {}),
+	});
+
+	return await Channels.pack(channel.id, me);
+});
diff --git a/src/server/api/endpoints/i.ts b/src/server/api/endpoints/i.ts
index 02d59682b8..bceb9548ef 100644
--- a/src/server/api/endpoints/i.ts
+++ b/src/server/api/endpoints/i.ts
@@ -24,7 +24,6 @@ export default define(meta, async (ps, user, token) => {
 
 	return await Users.pack(user, user, {
 		detail: true,
-		includeHasUnreadNotes: true,
 		includeSecrets: isSecure
 	});
 });
diff --git a/src/server/api/endpoints/notes/create.ts b/src/server/api/endpoints/notes/create.ts
index 5076dad82a..b8c4900af7 100644
--- a/src/server/api/endpoints/notes/create.ts
+++ b/src/server/api/endpoints/notes/create.ts
@@ -7,11 +7,12 @@ import { fetchMeta } from '../../../../misc/fetch-meta';
 import { ApiError } from '../../error';
 import { ID } from '../../../../misc/cafy-id';
 import { User } from '../../../../models/entities/user';
-import { Users, DriveFiles, Notes } from '../../../../models';
+import { Users, DriveFiles, Notes, Channels } from '../../../../models';
 import { DriveFile } from '../../../../models/entities/drive-file';
 import { Note } from '../../../../models/entities/note';
 import { DB_MAX_NOTE_TEXT_LENGTH } from '../../../../misc/hard-limits';
 import { noteVisibilities } from '../../../../types';
+import { Channel } from '../../../../models/entities/channel';
 
 let maxNoteTextLength = 500;
 
@@ -128,19 +129,26 @@ export const meta = {
 		},
 
 		replyId: {
-			validator: $.optional.type(ID),
+			validator: $.optional.nullable.type(ID),
 			desc: {
 				'ja-JP': '返信対象'
 			}
 		},
 
 		renoteId: {
-			validator: $.optional.type(ID),
+			validator: $.optional.nullable.type(ID),
 			desc: {
 				'ja-JP': 'Renote対象'
 			}
 		},
 
+		channelId: {
+			validator: $.optional.nullable.type(ID),
+			desc: {
+				'ja-JP': 'チャンネル'
+			}
+		},
+
 		poll: {
 			validator: $.optional.obj({
 				choices: $.arr($.str)
@@ -206,7 +214,13 @@ export const meta = {
 			message: 'Poll is already expired.',
 			code: 'CANNOT_CREATE_ALREADY_EXPIRED_POLL',
 			id: '04da457d-b083-4055-9082-955525eda5a5'
-		}
+		},
+
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: 'b1653923-5453-4edc-b786-7c4f39bb0bbb'
+		},
 	}
 };
 
@@ -269,6 +283,15 @@ export default define(meta, async (ps, user) => {
 		throw new ApiError(meta.errors.contentRequired);
 	}
 
+	let channel: Channel | undefined;
+	if (ps.channelId != null) {
+		channel = await Channels.findOne(ps.channelId);
+
+		if (channel == null) {
+			throw new ApiError(meta.errors.noSuchChannel);
+		}
+	}
+
 	// 投稿を作成
 	const note = await create(user, {
 		createdAt: new Date(),
@@ -286,6 +309,7 @@ export default define(meta, async (ps, user) => {
 		localOnly: ps.localOnly,
 		visibility: ps.visibility,
 		visibleUsers,
+		channel,
 		apMentions: ps.noExtractMentions ? [] : undefined,
 		apHashtags: ps.noExtractHashtags ? [] : undefined,
 		apEmojis: ps.noExtractEmojis ? [] : undefined,
diff --git a/src/server/api/endpoints/notes/global-timeline.ts b/src/server/api/endpoints/notes/global-timeline.ts
index 5e61c17841..6d99f1fdbc 100644
--- a/src/server/api/endpoints/notes/global-timeline.ts
+++ b/src/server/api/endpoints/notes/global-timeline.ts
@@ -80,6 +80,7 @@ export default define(meta, async (ps, user) => {
 	const query = makePaginationQuery(Notes.createQueryBuilder('note'),
 			ps.sinceId, ps.untilId, ps.sinceDate, ps.untilDate)
 		.andWhere('note.visibility = \'public\'')
+		.andWhere('note.channelId IS NULL')
 		.leftJoinAndSelect('note.user', 'user');
 
 	generateRepliesQuery(query, user);
diff --git a/src/server/api/endpoints/notes/hybrid-timeline.ts b/src/server/api/endpoints/notes/hybrid-timeline.ts
index fab4e9f4e5..2b91b8c67b 100644
--- a/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -13,6 +13,7 @@ import { generateRepliesQuery } from '../../common/generate-replies-query';
 import { injectPromo } from '../../common/inject-promo';
 import { injectFeatured } from '../../common/inject-featured';
 import { generateMutedNoteQuery } from '../../common/generate-muted-note-query';
+import { generateChannelQuery } from '../../common/generate-channel-query';
 
 export const meta = {
 	desc: {
@@ -131,6 +132,7 @@ export default define(meta, async (ps, user) => {
 		.leftJoinAndSelect('note.user', 'user')
 		.setParameters(followingQuery.getParameters());
 
+	generateChannelQuery(query, user);
 	generateRepliesQuery(query, user);
 	generateVisibilityQuery(query, user);
 	generateMutedUserQuery(query, user);
diff --git a/src/server/api/endpoints/notes/local-timeline.ts b/src/server/api/endpoints/notes/local-timeline.ts
index 38ec1d4727..51e35e6241 100644
--- a/src/server/api/endpoints/notes/local-timeline.ts
+++ b/src/server/api/endpoints/notes/local-timeline.ts
@@ -13,6 +13,7 @@ import { generateRepliesQuery } from '../../common/generate-replies-query';
 import { injectPromo } from '../../common/inject-promo';
 import { injectFeatured } from '../../common/inject-featured';
 import { generateMutedNoteQuery } from '../../common/generate-muted-note-query';
+import { generateChannelQuery } from '../../common/generate-channel-query';
 
 export const meta = {
 	desc: {
@@ -99,6 +100,7 @@ export default define(meta, async (ps, user) => {
 		.andWhere('(note.visibility = \'public\') AND (note.userHost IS NULL)')
 		.leftJoinAndSelect('note.user', 'user');
 
+	generateChannelQuery(query, user);
 	generateRepliesQuery(query, user);
 	generateVisibilityQuery(query, user);
 	if (user) generateMutedUserQuery(query, user);
diff --git a/src/server/api/endpoints/notes/timeline.ts b/src/server/api/endpoints/notes/timeline.ts
index 657739820b..f09f3d1733 100644
--- a/src/server/api/endpoints/notes/timeline.ts
+++ b/src/server/api/endpoints/notes/timeline.ts
@@ -11,6 +11,7 @@ import { generateRepliesQuery } from '../../common/generate-replies-query';
 import { injectPromo } from '../../common/inject-promo';
 import { injectFeatured } from '../../common/inject-featured';
 import { generateMutedNoteQuery } from '../../common/generate-muted-note-query';
+import { generateChannelQuery } from '../../common/generate-channel-query';
 
 export const meta = {
 	desc: {
@@ -124,6 +125,7 @@ export default define(meta, async (ps, user) => {
 		.leftJoinAndSelect('note.user', 'user')
 		.setParameters(followingQuery.getParameters());
 
+	generateChannelQuery(query, user);
 	generateRepliesQuery(query, user);
 	generateVisibilityQuery(query, user);
 	generateMutedUserQuery(query, user);
diff --git a/src/server/api/stream/channel.ts b/src/server/api/stream/channel.ts
index 82a95ad3d7..9b7c31e7bb 100644
--- a/src/server/api/stream/channel.ts
+++ b/src/server/api/stream/channel.ts
@@ -27,6 +27,10 @@ export default abstract class Channel {
 		return this.connection.muting;
 	}
 
+	protected get followingChannels() {
+		return this.connection.followingChannels;
+	}
+
 	protected get subscriber() {
 		return this.connection.subscriber;
 	}
diff --git a/src/server/api/stream/channels/channel.ts b/src/server/api/stream/channels/channel.ts
new file mode 100644
index 0000000000..c24b3db937
--- /dev/null
+++ b/src/server/api/stream/channels/channel.ts
@@ -0,0 +1,49 @@
+import autobind from 'autobind-decorator';
+import Channel from '../channel';
+import { Notes } from '../../../../models';
+import { isMutedUserRelated } from '../../../../misc/is-muted-user-related';
+import { PackedNote } from '../../../../models/repositories/note';
+
+export default class extends Channel {
+	public readonly chName = 'channel';
+	public static shouldShare = false;
+	public static requireCredential = false;
+	private channelId: string;
+
+	@autobind
+	public async init(params: any) {
+		this.channelId = params.channelId as string;
+
+		// Subscribe stream
+		this.subscriber.on('notesStream', this.onNote);
+	}
+
+	@autobind
+	private async onNote(note: PackedNote) {
+		if (note.channelId !== this.channelId) return;
+
+		// リプライなら再pack
+		if (note.replyId != null) {
+			note.reply = await Notes.pack(note.replyId, this.user, {
+				detail: true
+			});
+		}
+		// Renoteなら再pack
+		if (note.renoteId != null) {
+			note.renote = await Notes.pack(note.renoteId, this.user, {
+				detail: true
+			});
+		}
+
+		// 流れてきたNoteがミュートしているユーザーが関わるものだったら無視する
+		if (isMutedUserRelated(note, this.muting)) return;
+
+		this.send('note', note);
+	}
+
+	@autobind
+	public dispose() {
+		// Unsubscribe events
+		this.subscriber.off('notesStream', this.onNote);
+	}
+}
diff --git a/src/server/api/stream/channels/global-timeline.ts b/src/server/api/stream/channels/global-timeline.ts
index d530907d8d..8c97e67226 100644
--- a/src/server/api/stream/channels/global-timeline.ts
+++ b/src/server/api/stream/channels/global-timeline.ts
@@ -25,6 +25,7 @@ export default class extends Channel {
 	@autobind
 	private async onNote(note: PackedNote) {
 		if (note.visibility !== 'public') return;
+		if (note.channelId != null) return;
 
 		// リプライなら再pack
 		if (note.replyId != null) {
diff --git a/src/server/api/stream/channels/home-timeline.ts b/src/server/api/stream/channels/home-timeline.ts
index caf4ccf5e9..15fe7fa6f0 100644
--- a/src/server/api/stream/channels/home-timeline.ts
+++ b/src/server/api/stream/channels/home-timeline.ts
@@ -18,8 +18,12 @@ export default class extends Channel {
 
 	@autobind
 	private async onNote(note: PackedNote) {
-		// その投稿のユーザーをフォローしていなかったら弾く
-		if (this.user!.id !== note.userId && !this.following.includes(note.userId)) return;
+		if (note.channelId) {
+			if (!this.followingChannels.includes(note.channelId)) return;
+		} else {
+			// その投稿のユーザーをフォローしていなかったら弾く
+			if ((this.user!.id !== note.userId) && !this.following.includes(note.userId)) return;
+		}
 
 		if (['followers', 'specified'].includes(note.visibility)) {
 			note = await Notes.pack(note.id, this.user!, {
diff --git a/src/server/api/stream/channels/hybrid-timeline.ts b/src/server/api/stream/channels/hybrid-timeline.ts
index 1aec98aa72..4dc5f01a32 100644
--- a/src/server/api/stream/channels/hybrid-timeline.ts
+++ b/src/server/api/stream/channels/hybrid-timeline.ts
@@ -23,11 +23,15 @@ export default class extends Channel {
 
 	@autobind
 	private async onNote(note: PackedNote) {
-		// 自分自身の投稿 または その投稿のユーザーをフォローしている または 全体公開のローカルの投稿 の場合だけ
+		// チャンネルの投稿ではなく、自分自身の投稿 または
+		// チャンネルの投稿ではなく、その投稿のユーザーをフォローしている または
+		// チャンネルの投稿ではなく、全体公開のローカルの投稿 または
+		// フォローしているチャンネルの投稿 の場合だけ
 		if (!(
-			this.user!.id === note.userId ||
-			this.following.includes(note.userId) ||
-			((note.user as PackedUser).host == null && note.visibility === 'public')
+			(note.channelId == null && this.user!.id === note.userId) ||
+			(note.channelId == null && this.following.includes(note.userId)) ||
+			(note.channelId == null && ((note.user as PackedUser).host == null && note.visibility === 'public')) ||
+			(note.channelId != null && this.followingChannels.includes(note.channelId))
 		)) return;
 
 		if (['followers', 'specified'].includes(note.visibility)) {
diff --git a/src/server/api/stream/channels/index.ts b/src/server/api/stream/channels/index.ts
index 6efad078c6..1841573043 100644
--- a/src/server/api/stream/channels/index.ts
+++ b/src/server/api/stream/channels/index.ts
@@ -11,6 +11,7 @@ import messaging from './messaging';
 import messagingIndex from './messaging-index';
 import drive from './drive';
 import hashtag from './hashtag';
+import channel from './channel';
 import admin from './admin';
 import gamesReversi from './games/reversi';
 import gamesReversiGame from './games/reversi-game';
@@ -29,6 +30,7 @@ export default {
 	messagingIndex,
 	drive,
 	hashtag,
+	channel,
 	admin,
 	gamesReversi,
 	gamesReversiGame
diff --git a/src/server/api/stream/channels/local-timeline.ts b/src/server/api/stream/channels/local-timeline.ts
index 6426ccc23f..baeae86603 100644
--- a/src/server/api/stream/channels/local-timeline.ts
+++ b/src/server/api/stream/channels/local-timeline.ts
@@ -27,6 +27,7 @@ export default class extends Channel {
 	private async onNote(note: PackedNote) {
 		if ((note.user as PackedUser).host !== null) return;
 		if (note.visibility !== 'public') return;
+		if (note.channelId != null && !this.followingChannels.includes(note.channelId)) return;
 
 		// リプライなら再pack
 		if (note.replyId != null) {
diff --git a/src/server/api/stream/index.ts b/src/server/api/stream/index.ts
index bebf88a7cd..d420c6e794 100644
--- a/src/server/api/stream/index.ts
+++ b/src/server/api/stream/index.ts
@@ -7,7 +7,8 @@ import Channel from './channel';
 import channels from './channels';
 import { EventEmitter } from 'events';
 import { User } from '../../../models/entities/user';
-import { Users, Followings, Mutings, UserProfiles } from '../../../models';
+import { Channel as ChannelModel } from '../../../models/entities/channel';
+import { Users, Followings, Mutings, UserProfiles, ChannelFollowings } from '../../../models';
 import { ApiError } from '../error';
 import { AccessToken } from '../../../models/entities/access-token';
 import { UserProfile } from '../../../models/entities/user-profile';
@@ -20,6 +21,7 @@ export default class Connection {
 	public userProfile?: UserProfile;
 	public following: User['id'][] = [];
 	public muting: User['id'][] = [];
+	public followingChannels: ChannelModel['id'][] = [];
 	public token?: AccessToken;
 	private wsConnection: websocket.connection;
 	public subscriber: EventEmitter;
@@ -27,6 +29,7 @@ export default class Connection {
 	private subscribingNotes: any = {};
 	private followingClock: NodeJS.Timer;
 	private mutingClock: NodeJS.Timer;
+	private followingChannelsClock: NodeJS.Timer;
 	private userProfileClock: NodeJS.Timer;
 
 	constructor(
@@ -53,6 +56,9 @@ export default class Connection {
 			this.updateMuting();
 			this.mutingClock = setInterval(this.updateMuting, 5000);
 
+			this.updateFollowingChannels();
+			this.followingChannelsClock = setInterval(this.updateFollowingChannels, 5000);
+
 			this.updateUserProfile();
 			this.userProfileClock = setInterval(this.updateUserProfile, 5000);
 		}
@@ -269,6 +275,18 @@ export default class Connection {
 	}
 
 	@autobind
+	private async updateFollowingChannels() {
+		const followings = await ChannelFollowings.find({
+			where: {
+				followerId: this.user!.id
+			},
+			select: ['followeeId']
+		});
+
+		this.followingChannels = followings.map(x => x.followeeId);
+	}
+
+	@autobind
 	private async updateUserProfile() {
 		this.userProfile = await UserProfiles.findOne({
 			userId: this.user!.id
@@ -286,6 +304,7 @@ export default class Connection {
 
 		if (this.followingClock) clearInterval(this.followingClock);
 		if (this.mutingClock) clearInterval(this.mutingClock);
+		if (this.followingChannelsClock) clearInterval(this.followingChannelsClock);
 		if (this.userProfileClock) clearInterval(this.userProfileClock);
 	}
 }