feat: チャンネルをお気に入りに登録できるように

Resolve #10097

packages/backend/src/server/api/endpoints/channels/favorite.ts

@@ -0,0 +1,61 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import type { ChannelFavoritesRepository, ChannelsRepository } from '@/models/index.js';
+import { IdService } from '@/core/IdService.js';
+import { DI } from '@/di-symbols.js';
+import { ApiError } from '../../error.js';
+
+export const meta = {
+	tags: ['channels'],
+
+	requireCredential: true,
+
+	kind: 'write:channels',
+
+	errors: {
+		noSuchChannel: {
+			message: 'No such channel.',
+			code: 'NO_SUCH_CHANNEL',
+			id: '4938f5f3-6167-4c04-9149-6607b7542861',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		channelId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['channelId'],
+} as const;
+
+// eslint-disable-next-line import/no-default-export
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> {
+	constructor(
+		@Inject(DI.channelsRepository)
+		private channelsRepository: ChannelsRepository,
+
+		@Inject(DI.channelFavoritesRepository)
+		private channelFavoritesRepository: ChannelFavoritesRepository,
+
+		private idService: IdService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const channel = await this.channelsRepository.findOneBy({
+				id: ps.channelId,
+			});
+
+			if (channel == null) {
+				throw new ApiError(meta.errors.noSuchChannel);
+			}
+
+			await this.channelFavoritesRepository.insert({
+				id: this.idService.genId(),
+				createdAt: new Date(),
+				userId: me.id,
+				channelId: channel.id,
+			});
+		});
+	}
+}