misskey/packages/backend/src/server/api/endpoints/channels/follow.ts

import { Inject, Injectable } from '@nestjs/common';
import { Endpoint } from '@/server/api/endpoint-base.js';
import type { ChannelFollowingsRepository, ChannelsRepository } from '@/models/index.js';
import { IdService } from '@/core/IdService.js';
import { GlobalEventService } from '@/core/GlobalEventService.js';
import { DI } from '@/di-symbols.js';
import { ApiError } from '../../error.js';

export const meta = {
	tags: ['channels'],

	requireCredential: true,

	prohibitMoved: true,

	kind: 'write:channels',

	errors: {
		noSuchChannel: {
			message: 'No such channel.',
			code: 'NO_SUCH_CHANNEL',
			id: 'c0031718-d573-4e85-928e-10039f1fbb68',
		},
	},
} 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.channelFollowingsRepository)
		private channelFollowingsRepository: ChannelFollowingsRepository,

		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.channelFollowingsRepository.insert({
				id: this.idService.genId(),
				createdAt: new Date(),
				followerId: me.id,
				followeeId: channel.id,
			});
		});
	}
}