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proxyfilter.js
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proxyfilter.js
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//
// Copyright (c) Microsoft and contributors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
//
'use strict';
var _ = require('underscore');
var tunnel = require('tunnel');
var https = require('https');
var url = require('url');
var azureutil = require('../../util/util');
/**
* Creates a filter to set proxy options;
*
* @param {object} proxy The proxy url (with host, port and protocol properties).
*/
exports.create = function (proxy) {
if (!proxy || !_.isObject(proxy)) {
throw new Error('Invalid proxy argument');
}
if (!proxy.host) {
throw new Error('Invalid proxy host');
}
if (!proxy.port) {
throw new Error('Invalid proxy port');
}
if (!proxy.protocol) {
throw new Error('Invalid proxy protocol');
}
return function handle (resource, next, callback) {
exports.setAgent(resource, proxy);
return next(resource, callback);
};
};
/**
* Set the Agent to use for the request
* Result depends on proxy settings and protocol
*
* @param {object} resouce request options for request.
* @param {object} proxy parsed url for the proxy.
*/
exports.setAgent = function (resource, proxy) {
var requestUrl = url.parse(resource.url);
var isHTTPS = azureutil.urlIsHTTPS(requestUrl);
if (proxy) {
// Disable strict SSL by default as there will be a proxy in the middle
resource.strictSSL = false;
var agentinfo = {
proxy: proxy
};
if (resource.key) {
agentinfo.key = resource.key;
}
if (resource.cert) {
agentinfo.cert = resource.cert;
}
var isOverHTTPS = azureutil.urlIsHTTPS(proxy);
if (isHTTPS) {
if (isOverHTTPS) {
resource.agent = tunnel.httpsOverHttps(agentinfo);
} else {
resource.agent = tunnel.httpsOverHttp(agentinfo);
}
} else {
if (isOverHTTPS) {
resource.agent = tunnel.httpOverHttps(agentinfo);
} else {
resource.agent = tunnel.httpOverHttp(agentinfo);
}
}
} else if (isHTTPS) {
resource.agent = new https.Agent(resource);
}
};