2022-02-27 03:07:39 +01:00
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import config from '@/config/index.js';
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import { getJson } from '@/misc/fetch.js';
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import { ILocalUser } from '@/models/entities/user.js';
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import { getInstanceActor } from '@/services/instance-actor.js';
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import { signedGet } from './request.js';
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import { IObject, isCollectionOrOrderedCollection, ICollection, IOrderedCollection } from './type.js';
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import { fetchMeta } from '@/misc/fetch-meta.js';
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import { extractDbHost } from '@/misc/convert-host.js';
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2018-03-31 12:55:00 +02:00
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2018-04-01 14:56:11 +02:00
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export default class Resolver {
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2018-04-04 16:12:35 +02:00
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private history: Set<string>;
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2020-10-17 18:46:40 +02:00
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private user?: ILocalUser;
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2018-04-01 14:56:11 +02:00
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2018-04-04 16:12:35 +02:00
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constructor() {
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this.history = new Set();
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2018-03-31 12:55:00 +02:00
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}
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2019-03-04 06:02:42 +01:00
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public getHistory(): string[] {
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return Array.from(this.history);
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}
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2019-09-26 21:58:28 +02:00
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public async resolveCollection(value: string | IObject): Promise<ICollection | IOrderedCollection> {
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2018-04-04 16:12:35 +02:00
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const collection = typeof value === 'string'
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? await this.resolve(value)
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: value;
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2019-09-26 21:58:28 +02:00
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if (isCollectionOrOrderedCollection(collection)) {
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return collection;
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} else {
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2020-09-17 14:05:47 +02:00
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throw new Error(`unrecognized collection type: ${collection.type}`);
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2018-04-04 16:12:35 +02:00
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}
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}
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2019-09-26 21:58:28 +02:00
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public async resolve(value: string | IObject): Promise<IObject> {
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2018-04-05 15:49:41 +02:00
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if (value == null) {
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throw new Error('resolvee is null (or undefined)');
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}
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2018-04-01 14:56:11 +02:00
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if (typeof value !== 'string') {
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2018-04-04 16:12:35 +02:00
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return value;
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2018-04-01 14:56:11 +02:00
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}
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2018-03-31 12:55:00 +02:00
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2018-04-04 16:12:35 +02:00
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if (this.history.has(value)) {
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throw new Error('cannot resolve already resolved one');
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}
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2018-03-31 12:55:00 +02:00
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2018-04-04 16:12:35 +02:00
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this.history.add(value);
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2018-03-31 12:55:00 +02:00
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2021-09-18 08:45:02 +02:00
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const meta = await fetchMeta();
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const host = extractDbHost(value);
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if (meta.blockedHosts.includes(host)) {
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throw new Error('Instance is blocked');
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}
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2020-10-17 18:46:40 +02:00
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if (config.signToActivityPubGet && !this.user) {
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this.user = await getInstanceActor();
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}
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const object = this.user
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? await signedGet(value, this.user)
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: await getJson(value, 'application/activity+json, application/ld+json');
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2018-03-31 12:55:00 +02:00
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2019-04-07 14:50:36 +02:00
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if (object == null || (
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2018-04-01 14:56:11 +02:00
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Array.isArray(object['@context']) ?
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!object['@context'].includes('https://www.w3.org/ns/activitystreams') :
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object['@context'] !== 'https://www.w3.org/ns/activitystreams'
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)) {
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2018-04-04 16:12:35 +02:00
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throw new Error('invalid response');
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2018-03-31 12:55:00 +02:00
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}
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2018-04-04 16:12:35 +02:00
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return object;
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2018-03-31 12:55:00 +02:00
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}
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}
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