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| var URL = require('url'), | |
| http = require('http'), | |
| https = require('https'), | |
| _ = require('lodash'), | |
| contentTypes = require('./content-types.js'), | |
| debug = require('debug')('unblocker:proxy'), | |
| request = require('request'); | |
| function proxy(config) { | |
| /** | |
| * Makes the outgoing request and relays it to the client, modifying it along the way if necessary | |
| */ | |
| function proxyRequest(data, next) { | |
| debug('proxying %s %s', data.clientRequest.method, data.url); | |
| var middlewareHandledRequest = _.some(config.requestMiddleware, function(middleware) { | |
| middleware(data); | |
| return data.clientResponse.headersSent; // if true, then _.some will stop processing middleware here because we can no longer | |
| }); | |
| if (!middlewareHandledRequest) { | |
| var uri = URL.parse(data.url); | |
| var options = { | |
| uri: uri, | |
| host: uri.hostname, | |
| port: uri.port, | |
| path: uri.path, | |
| method: data.clientRequest.method, | |
| headers: data.headers | |
| }; | |
| //set the agent for the request. | |
| if(uri.protocol == 'http:' && config.httpAgent) { | |
| options.agent = config.httpAgent; | |
| } | |
| if(uri.protocol == 'https:' && config.httpsAgent) { | |
| options.agent = config.httpsAgent; | |
| } | |
| // what protocol to use for outgoing connections. | |
| var proto = (uri.protocol == 'https:') ? https : http; | |
| debug('sending remote request: ', options); | |
| data.remoteRequest = request(options) | |
| data.remoteRequest.on('response', function(remoteResponse) { | |
| data.remoteResponse = remoteResponse; | |
| data.remoteResponse.on('error', next); | |
| proxyResponse(data) | |
| }) | |
| data.remoteRequest.on('error', next); | |
| // pass along POST data & let the remote server know when we're done sending data | |
| data.stream.pipe(data.remoteRequest); | |
| } | |
| } | |
| function proxyResponse(data) { | |
| debug('proxying %s response for %s', data.remoteResponse.statusCode, data.url); | |
| // make a copy of the headers to fiddle with | |
| data.headers = _.cloneDeep(data.remoteResponse.headers); | |
| // create a stream object fir middleware to pipe from and overwrite | |
| data.stream = data.remoteResponse; | |
| data.contentType = contentTypes.getType(data); | |
| var middlewareHandledResponse = _.some(config.responseMiddleware, function(middleware) { | |
| middleware(data); | |
| return data.clientResponse.headersSent; // if true, then _.some will stop processing middleware here | |
| }); | |
| if (!middlewareHandledResponse) { | |
| // fire off out (possibly modified) headers | |
| data.clientResponse.writeHead(data.remoteResponse.statusCode, data.headers); | |
| data.stream.pipe(data.clientResponse); | |
| } | |
| } | |
| return proxyRequest; | |
| } | |
| module.exports = proxy; |
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