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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Implements a simple XmlHttpRequest-based text document
* fetcher.
*
*/
'use strict';
/**
* A fetcher of text files.
* @interface
*/
function TextFetcher() {}
/**
* @param {string} url The URL to fetch.
* @param {string?} opt_method The HTTP method to use (default GET)
* @param {string?} opt_body The request body
* @return {!Promise<string>} A promise for the fetched text. In case of an
* error, this promise is rejected with an HTTP status code.
*/
TextFetcher.prototype.fetch = function(url, opt_method, opt_body) {};
/**
* @constructor
* @implements {TextFetcher}
*/
function XhrTextFetcher() {}
/**
* @param {string} url The URL to fetch.
* @param {string?} opt_method The HTTP method to use (default GET)
* @param {string?} opt_body The request body
* @return {!Promise<string>} A promise for the fetched text. In case of an
* error, this promise is rejected with an HTTP status code.
*/
XhrTextFetcher.prototype.fetch = function(url, opt_method, opt_body) {
return new Promise(function(resolve, reject) {
var xhr = new XMLHttpRequest();
var method = opt_method || 'GET';
xhr.open(method, url, true);
xhr.onloadend = function() {
if (xhr.status != 200) {
reject(xhr.status);
return;
}
resolve(xhr.responseText);
};
xhr.onerror = function() {
// Treat any network-level errors as though the page didn't exist.
reject(404);
};
if (opt_body) {
xhr.send(opt_body);
} else {
xhr.send();
}
});
};
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