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import { Inject, Injectable } from '@nestjs/common';
import { summaly } from 'summaly';
import { DI } from '@/di-symbols.js';
import type { Config } from '@/config.js';
import { MetaService } from '@/core/MetaService.js';
import { HttpRequestService } from '@/core/HttpRequestService.js';
import type Logger from '@/logger.js';
import { query } from '@/misc/prelude/url.js';
import { LoggerService } from '@/core/LoggerService.js';
import { bindThis } from '@/decorators.js';
import { ApiError } from '@/server/api/error.js';
import type { FastifyRequest, FastifyReply } from 'fastify';
@Injectable()
export class UrlPreviewService {
private logger: Logger;
constructor(
@Inject(DI.config)
private config: Config,
private metaService: MetaService,
private httpRequestService: HttpRequestService,
private loggerService: LoggerService,
) {
this.logger = this.loggerService.getLogger('url-preview');
}
@bindThis
private wrap(url?: string | null): string | null {
return url != null
? url.match(/^https?:\/\//)
? `${this.config.mediaProxy}/preview.webp?${query({
url,
preview: '1',
})}`
: url
: null;
}
@bindThis
public async handle(
request: FastifyRequest<{ Querystring: { url: string; lang?: string; } }>,
reply: FastifyReply,
): Promise<object | undefined> {
const url = request.query.url;
if (typeof url !== 'string') {
reply.code(400);
return;
}
const lang = request.query.lang;
if (Array.isArray(lang)) {
reply.code(400);
return;
}
const meta = await this.metaService.fetch();
this.logger.info(meta.summalyProxy
? `(Proxy) Getting preview of ${url}@${lang} ...`
: `Getting preview of ${url}@${lang} ...`);
try {
const summary = meta.summalyProxy ?
await this.httpRequestService.getJson<ReturnType<typeof summaly>>(`${meta.summalyProxy}?${query({
url: url,
lang: lang ?? 'ja-JP',
})}`)
:
await summaly(url, {
followRedirects: false,
lang: lang ?? 'ja-JP',
agent: {
http: this.httpRequestService.httpAgent,
https: this.httpRequestService.httpsAgent,
},
});
this.logger.succ(`Got preview of ${url}: ${summary.title}`);
if (!(summary.url.startsWith('http://') || summary.url.startsWith('https://'))) {
throw new Error('unsupported schema included');
}
if (summary.player.url && !(summary.player.url.startsWith('http://') || summary.player.url.startsWith('https://'))) {
throw new Error('unsupported schema included');
}
summary.icon = this.wrap(summary.icon);
summary.thumbnail = this.wrap(summary.thumbnail);
// Cache 7days
reply.header('Cache-Control', 'max-age=604800, immutable');
return summary;
} catch (err) {
this.logger.warn(`Failed to get preview of ${url}: ${err}`);
reply.code(422);
reply.header('Cache-Control', 'max-age=86400, immutable');
return {
error: new ApiError({
message: 'Failed to get preview',
code: 'URL_PREVIEW_FAILED',
id: '09d01cb5-53b9-4856-82e5-38a50c290a3b',
}),
};
}
}
}
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