misskey/packages/backend/src/server/api/endpoints/pages/like.ts

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

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

	requireCredential: true,

	kind: 'write:page-likes',

	errors: {
		noSuchPage: {
			message: 'No such page.',
			code: 'NO_SUCH_PAGE',
			id: 'cc98a8a2-0dc3-4123-b198-62c71df18ed3',
		},

		yourPage: {
			message: 'You cannot like your page.',
			code: 'YOUR_PAGE',
			id: '28800466-e6db-40f2-8fae-bf9e82aa92b8',
		},

		alreadyLiked: {
			message: 'The page has already been liked.',
			code: 'ALREADY_LIKED',
			id: 'd4c1edbe-7da2-4eae-8714-1acfd2d63941',
		},
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		pageId: { type: 'string', format: 'misskey:id' },
	},
	required: ['pageId'],
} as const;

// eslint-disable-next-line import/no-default-export
@Injectable()
export default class extends Endpoint<typeof meta, typeof paramDef> {
	constructor(
		@Inject(DI.pagesRepository)
		private pagesRepository: PagesRepository,

		@Inject(DI.pageLikesRepository)
		private pageLikesRepository: PageLikesRepository,

		private idService: IdService,
	) {
		super(meta, paramDef, async (ps, me) => {
			const page = await this.pagesRepository.findOneBy({ id: ps.pageId });
			if (page == null) {
				throw new ApiError(meta.errors.noSuchPage);
			}

			if (page.userId === me.id) {
				throw new ApiError(meta.errors.yourPage);
			}

			// if already liked
			const exist = await this.pageLikesRepository.findOneBy({
				pageId: page.id,
				userId: me.id,
			});

			if (exist != null) {
				throw new ApiError(meta.errors.alreadyLiked);
			}

			// Create like
			await this.pageLikesRepository.insert({
				id: this.idService.genId(),
				createdAt: new Date(),
				pageId: page.id,
				userId: me.id,
			});

			this.pagesRepository.increment({ id: page.id }, 'likedCount', 1);
		});
	}
}