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110 lines
3.1 KiB
110 lines
3.1 KiB
8 years ago
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/**
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* @license
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var https = require('https');
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var parse = require('url').parse;
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var version = require('../version');
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// add keep-alive header to speed up request
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var agent = new https.Agent({ keepAlive: true });
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/**
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* Makes a secure HTTP GET request for the given URL.
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*
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* Calls the callback with two parameters (err, response). If there was an
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* error, response should be null. If there was no error, err should be null,
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* and response should be an object with these properties
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* {
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* status: number,
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* headers: Object,
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* json: Object
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* }
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*
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* Returns a function that cancels the request.
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*
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* @param {string} url
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* @param {function(ClientResponse)} onSuccess
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* @param {function(?)} onError
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* @param {Object} options
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* @return {function()}
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*/
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module.exports = function makeUrlRequest(url, onSuccess, onError, options) {
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var requestOptions = parse(url);
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var body;
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// Allow each API to provide some of the request options such as the
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// HTTP method, headers, etc.
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if (options) {
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for (var k in options) {
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if (k === 'body') {
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body = options[k];
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} else {
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requestOptions[k] = options[k];
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}
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}
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}
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requestOptions.headers = requestOptions.headers || {};
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requestOptions.headers['User-Agent'] = 'GoogleGeoApiClientJS/' + version;
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var request = https.request(requestOptions, function(response) {
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response.on('error', function(error) {
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onError(error);
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});
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if (response.statusCode === 302) {
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// Handle redirect.
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var url = response.headers['location'];
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makeUrlRequest(url, onSuccess, onError, options);
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} else if (response.headers['content-type'] == 'application/json; charset=UTF-8') {
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// Handle JSON.
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var data = [];
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response.on('data', function(chunk) {
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data.push(chunk);
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});
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response.on('end', function() {
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onSuccess({
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status: response.statusCode,
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headers: response.headers,
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json: JSON.parse(Buffer.concat(data).toString())
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})
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});
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} else {
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// Fallback is for binary data, namely places photo download,
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// so just provide the response stream. Also provide the same
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// consistent name for status checking as per JSON responses.
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response.status = response.statusCode;
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onSuccess(response);
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}
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}).on('error', function(error) {
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onError(error);
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});
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if (body) {
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request.write(JSON.stringify(body));
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}
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request.end();
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return function cancel() { request.abort(); };
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};
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