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ResourceFetchHandler.ts
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ResourceFetchHandler.ts
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import RelativeURL from '../location/RelativeURL';
import DOMException from '../exception/DOMException';
import IDocument from '../nodes/document/IDocument';
/**
* Helper class for performing fetch of resources.
*/
export default class ResourceFetchHandler {
/**
* Returns resource data asynchonously.
*
* @param document Document.
* @param url URL.
* @returns Response.
*/
public static async fetch(document: IDocument, url: string): Promise<string> {
const response = await document.defaultView.fetch(url);
if (!response.ok) {
throw new DOMException(
`Failed to perform request to "${url}". Status code: ${response.status}`
);
}
return await response.text();
}
/**
* Returns resource data synchonously.
*
* @param document Document.
* @param url URL.
* @returns Response.
*/
public static fetchSync(document: IDocument, url: string): string {
// We want to only load SyncRequest when it is needed to improve performance and not have direct dependencies to server side packages.
const absoluteURL = RelativeURL.getAbsoluteURL(document.defaultView.location, url).href;
const syncRequest = require('sync-request');
const response = syncRequest('GET', absoluteURL, {
headers: {
'user-agent': document.defaultView.navigator.userAgent,
cookie: document.defaultView.document.cookie,
referer: document.defaultView.location.origin
}
});
if (response.isError()) {
throw new DOMException(
`Failed to perform request to "${absoluteURL}". Status code: ${response.statusCode}`
);
}
return response.getBody().toString();
}
}