/
loadWithXhr.js
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/
loadWithXhr.js
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/*global define*/
define([
'../ThirdParty/when',
'./defaultValue',
'./defined',
'./DeveloperError',
'./RequestErrorEvent',
'./RuntimeError'
], function(
when,
defaultValue,
defined,
DeveloperError,
RequestErrorEvent,
RuntimeError) {
'use strict';
/**
* Asynchronously loads the given URL. Returns a promise that will resolve to
* the result once loaded, or reject if the URL failed to load. The data is loaded
* using XMLHttpRequest, which means that in order to make requests to another origin,
* the server must have Cross-Origin Resource Sharing (CORS) headers enabled.
*
* @exports loadWithXhr
*
* @param {Object} options Object with the following properties:
* @param {String|Promise.<String>} options.url The URL of the data, or a promise for the URL.
* @param {String} [options.responseType] The type of response. This controls the type of item returned.
* @param {String} [options.method='GET'] The HTTP method to use.
* @param {String} [options.data] The data to send with the request, if any.
* @param {Object} [options.headers] HTTP headers to send with the request, if any.
* @param {String} [options.overrideMimeType] Overrides the MIME type returned by the server.
* @returns {Promise.<Object>} a promise that will resolve to the requested data when loaded.
*
*
* @example
* // Load a single URL asynchronously. In real code, you should use loadBlob instead.
* Cesium.loadWithXhr({
* url : 'some/url',
* responseType : 'blob'
* }).then(function(blob) {
* // use the data
* }).otherwise(function(error) {
* // an error occurred
* });
*
* @see loadArrayBuffer
* @see loadBlob
* @see loadJson
* @see loadText
* @see {@link http://www.w3.org/TR/cors/|Cross-Origin Resource Sharing}
* @see {@link http://wiki.commonjs.org/wiki/Promises/A|CommonJS Promises/A}
*/
function loadWithXhr(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
//>>includeStart('debug', pragmas.debug);
if (!defined(options.url)) {
throw new DeveloperError('options.url is required.');
}
//>>includeEnd('debug');
var responseType = options.responseType;
var method = defaultValue(options.method, 'GET');
var data = options.data;
var headers = options.headers;
var overrideMimeType = options.overrideMimeType;
return when(options.url, function(url) {
var deferred = when.defer();
loadWithXhr.load(url, responseType, method, data, headers, deferred, overrideMimeType);
return deferred.promise;
});
}
var dataUriRegex = /^data:(.*?)(;base64)?,(.*)$/;
function decodeDataUriText(isBase64, data) {
var result = decodeURIComponent(data);
if (isBase64) {
return atob(result);
}
return result;
}
function decodeDataUriArrayBuffer(isBase64, data) {
var byteString = decodeDataUriText(isBase64, data);
var buffer = new ArrayBuffer(byteString.length);
var view = new Uint8Array(buffer);
for (var i = 0; i < byteString.length; i++) {
view[i] = byteString.charCodeAt(i);
}
return buffer;
}
function decodeDataUri(dataUriRegexResult, responseType) {
responseType = defaultValue(responseType, '');
var mimeType = dataUriRegexResult[1];
var isBase64 = !!dataUriRegexResult[2];
var data = dataUriRegexResult[3];
switch (responseType) {
case '':
case 'text':
return decodeDataUriText(isBase64, data);
case 'arraybuffer':
return decodeDataUriArrayBuffer(isBase64, data);
case 'blob':
var buffer = decodeDataUriArrayBuffer(isBase64, data);
return new Blob([buffer], {
type : mimeType
});
case 'document':
var parser = new DOMParser();
return parser.parseFromString(decodeDataUriText(isBase64, data), mimeType);
case 'json':
return JSON.parse(decodeDataUriText(isBase64, data));
default:
throw new DeveloperError('Unhandled responseType: ' + responseType);
}
}
// This is broken out into a separate function so that it can be mocked for testing purposes.
loadWithXhr.load = function(url, responseType, method, data, headers, deferred, overrideMimeType) {
var dataUriRegexResult = dataUriRegex.exec(url);
if (dataUriRegexResult !== null) {
deferred.resolve(decodeDataUri(dataUriRegexResult, responseType));
return;
}
var xhr = new XMLHttpRequest();
if (defined(overrideMimeType) && defined(xhr.overrideMimeType)) {
xhr.overrideMimeType(overrideMimeType);
}
xhr.open(method, url, true);
if (defined(headers)) {
for ( var key in headers) {
if (headers.hasOwnProperty(key)) {
xhr.setRequestHeader(key, headers[key]);
}
}
}
if (defined(responseType)) {
xhr.responseType = responseType;
}
xhr.onload = function() {
if (xhr.status >= 200 && xhr.status < 300) {
if (defined(xhr.response)) {
deferred.resolve(xhr.response);
} else {
// busted old browsers.
if (defined(xhr.responseXML) && xhr.responseXML.hasChildNodes()) {
deferred.resolve(xhr.responseXML);
} else if (defined(xhr.responseText)) {
deferred.resolve(xhr.responseText);
} else {
deferred.reject(new RuntimeError('unknown XMLHttpRequest response type.'));
}
}
} else {
deferred.reject(new RequestErrorEvent(xhr.status, xhr.response, xhr.getAllResponseHeaders()));
}
};
xhr.onerror = function(e) {
deferred.reject(new RequestErrorEvent());
};
xhr.send(data);
};
loadWithXhr.defaultLoad = loadWithXhr.load;
return loadWithXhr;
});