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/*

proxy-stream.js: Duplex HTTP proxy stream.

Copyright (c) 2010 Charlie Robbins, Mikeal Rogers, Marak Squires, Fedor Indutny

Permission is hereby granted, free of charge, to any person obtaining

a copy of this software and associated documentation files (the

"Software"), to deal in the Software without restriction, including

without limitation the rights to use, copy, modify, merge, publish,

distribute, sublicense, and/or sell copies of the Software, and to

permit persons to whom the Software is furnished to do so, subject to

the following conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

var stream = require('stream'),

util = require('util');

var ProxyStream = module.exports = function (options) {

stream.Duplex.call(this);

this.errState = false;

this.options = options;

var self = this;

this.once('pipe', function (req) {

self.start(req);

});

};

util.inherits(ProxyStream, stream.Duplex);

ProxyStream.prototype._write = function (chunk, encoding, callback) {

this.pReq.write(chunk, encoding, callback);

};

ProxyStream.prototype._read = function (size) {

};

ProxyStream.prototype.start = function (req) {

var outgoing = this.options.target,

location;

//

// Setup outgoing proxy with relevant properties.

//

outgoing.host = target.host;

outgoing.hostname = target.hostname;

outgoing.port = target.port;

outgoing.socketPath = target.socketPath;

outgoing.agent = target.agent;

outgoing.method = req.method;

outgoing.path = req.url;

outgoing.headers = req.headers;

//

// If the changeOrigin option is specified, change the

// origin of the host header to the target URL! Please

// don't revert this without documenting it!

//

if (this.changeOrigin) {

outgoing.headers.host = target.host + ':' + target.port;

}

//

// Open new HTTP request to internal resource with will act

// as a reverse proxy pass

//

pReq = target.protocol.request(outgoing, function (pRes) {

var pDraining = false,

pBuffer,

ended;

//

// Process the `pReq` `pRes` when it's received.

//

if (req.httpVersion === '1.0') {

if (req.headers.connection) {

pRes.headers.connection = req.headers.connection

} else {

pRes.headers.connection = 'close'

}

} else if (!pRes.headers.connection) {

if (req.headers.connection) { pRes.headers.connection = req.headers.connection }

else {

pRes.headers.connection = 'keep-alive'

}

}

// Remove `Transfer-Encoding` header if client's protocol is HTTP/1.0

// or if this is a DELETE request with no content-length header.

// See: https://github.com/nodejitsu/node-http-proxy/pull/373

if (req.httpVersion === '1.0' || (req.method === 'DELETE'

&& !req.headers['content-length'])) {

delete pRes.headers['transfer-encoding'];

}

if ((pRes.statusCode === 301 || pRes.statusCode === 302)

&& typeof pRes.headers.location !== 'undefined') {

location = url.parse(pRes.headers.location);

if (location.host === req.headers.host) {

if (self.source.https && !self.target.https) {

pRes.headers.location = pRes.headers.location.replace(/^http\:/, 'https:');

}

if (self.target.https && !self.source.https) {

pRes.headers.location = pRes.headers.location.replace(/^https\:/, 'http:');

}

}

}

//

// When the `pReq` `pRes` ends, end the

// corresponding outgoing `res` unless we have entered

// an error state. In which case, assume `res.end()` has

// already been called and the 'error' event listener

// removed.

//

pRes.on('close', function () {

if (!ended) { pRes.emit('end') }

});

pRes.on('end', function () {

ended = true;

if (!errState) {

try { res.end() }

catch (ex) { console.error('res.end error: %s', ex.message) }

// Emit the `end` event now that we have completed proxying

self.emit('end', req, res, pRes);

}

});

// Allow observer to modify headers or abort pRes

try { self.emit('proxyResponse', req, res, pRes) }

catch (ex) {

errState = true;

return;

}

// Set the headers of the client pRes

Object.keys(pRes.headers).forEach(function (key) {

res.setHeader(key, pRes.headers[key]);

});

res.writeHead(pRes.statusCode);

pRes.on('readable', function onreadable() {

var bytes = pRes.read();

if (bytes && res.writable) {

if (pDraining) {

if (pBuffer) { return buffer.push(bytes) }

pBuffer = [bytes];

return;

}

// Only pause if the underlying buffers are full,

// *and* the connection is not in 'closing' state.

// Otherwise, the pause will cause pending data to

// be discarded and silently lost.

if (false === res.write(bytes)) {

pDraining = true;

}

}

});

res.on('drain', function ondrain() {

pDraining = false;

if (pBuffer.length) {

for (var i = 0; i < pBuffer.length; i++) {

//

// Remark: Should we check to see if `.write()`

// returns false here?

//

res.write(pBuffer[i]);

}

pBuffer.length = 0;

}

});

});

//

// Handle 'error' events from the `pReq`. Setup timeout override if needed

//

pReq.once('error', proxyError);

// Set a timeout on the socket if `this.timeout` is specified.

pReq.once('socket', function (socket) {

if (self.timeout) {

socket.setTimeout(self.timeout);

}

});

};