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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { Inject, Injectable } from '@nestjs/common';
import { summaly } from '@misskey-dev/summaly';
import { SummalyResult } from '@misskey-dev/summaly/built/summary.js';
import * as Redis from 'ioredis';
import { DI } from '@/di-symbols.js';
import type { Config } from '@/config.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 { MiMeta } from '@/models/Meta.js';
import { RedisKVCache } from '@/misc/cache.js';
import { UtilityService } from '@/core/UtilityService.js';
import type { FastifyRequest, FastifyReply } from 'fastify';
@Injectable()
export class UrlPreviewService {
private logger: Logger;
private previewCache: RedisKVCache<SummalyResult>;
constructor(
@Inject(DI.config)
private config: Config,
@Inject(DI.redis)
private redisClient: Redis.Redis,
@Inject(DI.meta)
private meta: MiMeta,
private httpRequestService: HttpRequestService,
private loggerService: LoggerService,
private utilityService: UtilityService,
) {
this.logger = this.loggerService.getLogger('url-preview');
this.previewCache = new RedisKVCache<SummalyResult>(this.redisClient, 'summaly', {
lifetime: 1000 * 60 * 60 * 24, // 1d
memoryCacheLifetime: 1000 * 60 * 10, // 10m
fetcher: () => { throw new Error('the UrlPreview cache should never fetch'); },
toRedisConverter: (value) => JSON.stringify(value),
fromRedisConverter: (value) => JSON.parse(value),
});
}
@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' || !URL.canParse(url)) {
reply.code(400);
return;
}
const lang = request.query.lang;
if (Array.isArray(lang)) {
reply.code(400);
return;
}
if (!this.meta.urlPreviewEnabled) {
reply.code(403);
return {
error: new ApiError({
message: 'URL preview is disabled',
code: 'URL_PREVIEW_DISABLED',
id: '58b36e13-d2f5-0323-b0c6-76aa9dabefb8',
}),
};
}
const host = new URL(url).host;
if (this.utilityService.isBlockedHost(this.meta.blockedHosts, host)) {
reply.code(403);
return {
error: new ApiError({
message: 'URL is blocked',
code: 'URL_PREVIEW_BLOCKED',
id: '50294652-857b-4b13-9700-8e5c7a8deae8',
}),
};
}
const key = `${url}@${lang}`;
const cached = await this.previewCache.get(key);
if (cached !== undefined) {
this.logger.info(`Returning cache preview of ${key}`);
// Cache 7days
reply.header('Cache-Control', 'max-age=604800, immutable');
return cached;
}
this.logger.info(this.meta.urlPreviewSummaryProxyUrl
? `(Proxy) Getting preview of ${key} ...`
: `Getting preview of ${key} ...`);
try {
const summary = this.meta.urlPreviewSummaryProxyUrl
? await this.fetchSummaryFromProxy(url, this.meta, lang)
: await this.fetchSummary(url, this.meta, lang);
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);
this.previewCache.set(key, summary);
// Cache 7days
reply.header('Cache-Control', 'max-age=604800, immutable');
return summary;
} catch (err) {
this.logger.warn(`Failed to get preview of ${url}: ${err}`);
reply.code(422);
reply.header('Cache-Control', 'max-age=86400, immutable');
return {
error: new ApiError({
message: 'Failed to get preview',
code: 'URL_PREVIEW_FAILED',
id: '09d01cb5-53b9-4856-82e5-38a50c290a3b',
}),
};
}
}
private fetchSummary(url: string, meta: MiMeta, lang?: string): Promise<SummalyResult> {
const agent = this.config.proxy
? {
http: this.httpRequestService.httpAgent,
https: this.httpRequestService.httpsAgent,
}
: undefined;
return summaly(url, {
followRedirects: false,
lang: lang ?? 'ja-JP',
agent: agent,
userAgent: meta.urlPreviewUserAgent ?? undefined,
operationTimeout: meta.urlPreviewTimeout,
contentLengthLimit: meta.urlPreviewMaximumContentLength,
contentLengthRequired: meta.urlPreviewRequireContentLength,
});
}
private fetchSummaryFromProxy(url: string, meta: MiMeta, lang?: string): Promise<SummalyResult> {
const proxy = meta.urlPreviewSummaryProxyUrl!;
const queryStr = query({
url: url,
lang: lang ?? 'ja-JP',
userAgent: meta.urlPreviewUserAgent ?? undefined,
operationTimeout: meta.urlPreviewTimeout,
contentLengthLimit: meta.urlPreviewMaximumContentLength,
contentLengthRequired: meta.urlPreviewRequireContentLength,
});
return this.httpRequestService.getJson<SummalyResult>(`${proxy}?${queryStr}`, 'application/json, */*', undefined, true);
}
}
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