77 lines
1.6 KiB
TypeScript
77 lines
1.6 KiB
TypeScript
import * as request from 'request-promise-native';
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import { IObject } from './type';
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import config from '../../config';
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export default class Resolver {
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private history: Set<string>;
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private timeout = 10 * 1000;
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constructor() {
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this.history = new Set();
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}
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public getHistory(): string[] {
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return Array.from(this.history);
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}
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public async resolveCollection(value: any) {
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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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switch (collection.type) {
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case 'Collection': {
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collection.objects = collection.items;
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break;
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}
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case 'OrderedCollection': {
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collection.objects = collection.orderedItems;
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break;
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}
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default: {
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throw new Error(`unknown collection type: ${collection.type}`);
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}
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}
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return collection;
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}
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public async resolve(value: any): Promise<IObject> {
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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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if (typeof value !== 'string') {
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return value;
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}
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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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this.history.add(value);
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const object = await request({
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url: value,
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proxy: config.proxy,
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timeout: this.timeout,
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headers: {
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'User-Agent': config.userAgent,
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Accept: 'application/activity+json, application/ld+json'
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},
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json: true
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});
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if (object === null || (
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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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throw new Error('invalid response');
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}
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return object;
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}
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}
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