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import { getJson } from '../../misc/fetch';
import { IObject, isCollectionOrOrderedCollection, ICollection, IOrderedCollection } from './type';
export default class Resolver {
private history: Set<string>;
constructor() {
this.history = new Set();
}
public getHistory(): string[] {
return Array.from(this.history);
}
public async resolveCollection(value: string | IObject): Promise<ICollection | IOrderedCollection> {
const collection = typeof value === 'string'
? await this.resolve(value)
: value;
if (isCollectionOrOrderedCollection(collection)) {
return collection;
} else {
throw new Error(`unknown collection type: ${collection.type}`);
}
}
public async resolve(value: string | IObject): Promise<IObject> {
if (value == null) {
throw new Error('resolvee is null (or undefined)');
}
if (typeof value !== 'string') {
return value;
}
if (this.history.has(value)) {
throw new Error('cannot resolve already resolved one');
}
this.history.add(value);
const object = await getJson(value, 'application/activity+json, application/ld+json');
if (object == null || (
Array.isArray(object['@context']) ?
!object['@context'].includes('https://www.w3.org/ns/activitystreams') :
object['@context'] !== 'https://www.w3.org/ns/activitystreams'
)) {
throw new Error('invalid response');
}
return object;
}
}
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