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request-browser.js
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request-browser.js
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'use strict';
var utils = require('pouchdb-binary-util');
var createBlob = utils.createBlob;
var readAsBinaryString = utils.readAsBinaryString;
var binaryStringToArrayBuffer = utils.binaryStringToArrayBuffer;
module.exports = function(options, callback) {
var xhr, timer, hasUpload;
var abortReq = function () {
xhr.abort();
};
if (options.xhr) {
xhr = new options.xhr();
} else {
xhr = new XMLHttpRequest();
}
// cache-buster, specifically designed to work around IE's aggressive caching
// see http://www.dashbay.com/2011/05/internet-explorer-caches-ajax/
if (options.method === 'GET' && !options.cache) {
var hasArgs = options.url.indexOf('?') !== -1;
options.url += (hasArgs ? '&' : '?') + '_nonce=' + Date.now();
}
xhr.open(options.method, options.url);
xhr.withCredentials = true;
if (options.json) {
options.headers.Accept = 'application/json';
options.headers['Content-Type'] = options.headers['Content-Type'] ||
'application/json';
if (options.body &&
options.processData &&
typeof options.body !== "string") {
options.body = JSON.stringify(options.body);
}
}
if (options.binary) {
xhr.responseType = 'arraybuffer';
}
if (!('body' in options)) {
options.body = null;
}
for (var key in options.headers) {
if (options.headers.hasOwnProperty(key)) {
xhr.setRequestHeader(key, options.headers[key]);
}
}
if (options.timeout > 0) {
timer = setTimeout(abortReq, options.timeout);
xhr.onprogress = function () {
clearTimeout(timer);
timer = setTimeout(abortReq, options.timeout);
};
if (typeof hasUpload === 'undefined') {
// IE throws an error if you try to access it directly
hasUpload = Object.keys(xhr).indexOf('upload') !== -1;
}
if (hasUpload) { // does not exist in ie9
xhr.upload.onprogress = xhr.onprogress;
}
}
xhr.onreadystatechange = function () {
if (xhr.readyState !== 4) {
return;
}
var response = {
statusCode: xhr.status
};
if (xhr.status >= 200 && xhr.status < 300) {
var data;
if (options.binary) {
data = createBlob([xhr.response || ''], {
type: xhr.getResponseHeader('Content-Type')
});
} else {
data = xhr.responseText;
}
callback(null, response, data);
} else {
var err = {};
try {
err = JSON.parse(xhr.response);
} catch(e) {}
callback(err, response);
}
};
if (options.body && (options.body instanceof Blob)) {
readAsBinaryString(options.body, function (binary) {
xhr.send(binaryStringToArrayBuffer(binary));
});
} else {
xhr.send(options.body);
}
return {abort: abortReq};
};