83 lines
2.1 KiB
JavaScript
83 lines
2.1 KiB
JavaScript
define(function(require) {
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// Pull in node's request module if possible/needed
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if (typeof XMLHttpRequest === 'undefined') {
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// This is a stupid workaround for the fact that
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// the r.js optimizer checks every require() call
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// during optimization and throws an error if it
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// can't find the module.
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//
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// This is only an issue with our browser build
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// using `almond` (https://github.com/jrburke/almond)
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// which doesn't fallback to node's require when we
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// need it to.
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var node_req = require;
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var request = node_req('request');
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}
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function browserDownload(uri, callback) {
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var query = new XMLHttpRequest();
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query.onload = function() {
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var err = query.status != 200 ? { message: query.statusText, code: query.status } : null,
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data = err ? null : new Uint8Array(query.response);
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callback(err, data);
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};
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query.open("GET", uri);
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if("withCredentials" in query) {
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query.withCredentials = true;
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}
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query.responseType = "arraybuffer";
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query.send();
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}
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function nodeDownload(uri, callback) {
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request({
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url: uri,
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method: "GET",
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encoding: null
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}, function(err, msg, body) {
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var data = null,
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arrayBuffer,
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statusCode,
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arrayLength = body && body.length,
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error;
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msg = msg || null;
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statusCode = msg && msg.statusCode;
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error = statusCode != 200 ? { message: err || 'Not found!', code: statusCode } : null;
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arrayBuffer = arrayLength && new ArrayBuffer(arrayLength);
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// Convert buffer to Uint8Array
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if (arrayBuffer && (statusCode == 200)) {
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data = new Uint8Array(arrayBuffer);
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for (var i = 0; i < body.length; ++i) {
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data[i] = body[i];
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}
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}
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callback(error, data);
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});
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}
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return {
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download: function(uri, callback) {
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if (!uri) {
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throw('Uri required!');
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}
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if (!callback) {
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throw('Callback required');
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}
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if (typeof XMLHttpRequest === "undefined") {
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nodeDownload(uri, callback);
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} else {
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browserDownload(uri, callback);
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}
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}
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};
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});
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