calckey/src/remote/activitypub/resolver.ts

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import { IObject } from "./type";
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const request = require('request-promise-native');
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export default class Resolver {
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private history: Set<string>;
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constructor() {
this.history = new Set();
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}
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public async resolveCollection(value) {
const collection = typeof value === 'string'
? await this.resolve(value)
: value;
switch (collection.type) {
case 'Collection':
collection.objects = collection.object.items;
break;
case 'OrderedCollection':
collection.objects = collection.object.orderedItems;
break;
default:
throw new Error(`unknown collection type: ${collection.type}`);
}
return collection;
}
public async resolve(value): Promise<IObject> {
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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)) {
throw new Error('cannot resolve already resolved one');
}
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this.history.add(value);
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const object = await request({
url: value,
headers: {
Accept: 'application/activity+json, application/ld+json'
},
json: true
});
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if (object === null || (
Array.isArray(object['@context']) ?
!object['@context'].includes('https://www.w3.org/ns/activitystreams') :
object['@context'] !== 'https://www.w3.org/ns/activitystreams'
)) {
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throw new Error('invalid response');
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}
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return object;
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}
}