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import * as request from 'request-promise-native';
import { IObject } from './type';
import config from '../../config';
import { apLogger } from './logger';
export const logger = apLogger.createSubLogger('resolver');
export default class Resolver {
private history: Set<string>;
private timeout = 10 * 1000;
constructor() {
this.history = new Set();
}
public async resolveCollection(value: any) {
const collection = typeof value === 'string'
? await this.resolve(value)
: value;
switch (collection.type) {
case 'Collection': {
collection.objects = collection.items;
break;
}
case 'OrderedCollection': {
collection.objects = collection.orderedItems;
break;
}
default: {
logger.error(`unknown collection type: ${collection.type}`);
throw new Error(`unknown collection type: ${collection.type}`);
}
}
return collection;
}
public async resolve(value: any): Promise<IObject> {
if (value == null) {
logger.error('resolvee is null (or undefined)');
throw new Error('resolvee is null (or undefined)');
}
if (typeof value !== 'string') {
return value;
}
if (this.history.has(value)) {
logger.error(`cannot resolve already resolved one`);
throw new Error('cannot resolve already resolved one');
}
this.history.add(value);
const object = await request({
url: value,
proxy: config.proxy,
timeout: this.timeout,
headers: {
'User-Agent': config.userAgent,
Accept: 'application/activity+json, application/ld+json'
},
json: true
}).catch(e => {
logger.error(`request error: ${e.message}`);
throw new Error(`request error: ${e.message}`);
});
if (object === null || (
Array.isArray(object['@context']) ?
!object['@context'].includes('https://www.w3.org/ns/activitystreams') :
object['@context'] !== 'https://www.w3.org/ns/activitystreams'
)) {
logger.error(`invalid response: ${value}`);
throw new Error('invalid response');
}
return object;
}
}
|
