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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | 1x 1x 1x 1x 1x 1x 5x 1x 1x | var httpNative = require('http'),
httpsNative = require('https'),
web_o = require('./web-outgoing'),
common = require('../common'),
followRedirects = require('follow-redirects');
web_o = Object.keys(web_o).map(function(pass) {
return web_o[pass];
});
var nativeAgents = { http: httpNative, https: httpsNative };
/*!
* Array of passes.
*
* A `pass` is just a function that is executed on `req, res, options`
* so that you can easily add new checks while still keeping the base
* flexible.
*/
module.exports = {
/**
* Sets `content-length` to '0' if request is of DELETE type.
*
* @param {ClientRequest} Req Request object
* @param {IncomingMessage} Res Response object
* @param {Object} Options Config object passed to the proxy
*
* @api private
*/
deleteLength: function deleteLength(req, res, options) {
if((req.method === 'DELETE' || req.method === 'OPTIONS')
&& !req.headers['content-length']) {
req.headers['content-length'] = '0';
delete req.headers['transfer-encoding'];
}
},
/**
* Sets timeout in request socket if it was specified in options.
*
* @param {ClientRequest} Req Request object
* @param {IncomingMessage} Res Response object
* @param {Object} Options Config object passed to the proxy
*
* @api private
*/
timeout: function timeout(req, res, options) {
if(options.timeout) {
req.socket.setTimeout(options.timeout);
}
},
/**
* Sets `x-forwarded-*` headers if specified in config.
*
* @param {ClientRequest} Req Request object
* @param {IncomingMessage} Res Response object
* @param {Object} Options Config object passed to the proxy
*
* @api private
*/
XHeaders: function XHeaders(req, res, options) {
if(!options.xfwd) return;
var encrypted = req.isSpdy || common.hasEncryptedConnection(req);
var values = {
for : req.connection.remoteAddress || req.socket.remoteAddress,
port : common.getPort(req),
proto: encrypted ? 'https' : 'http'
};
['for', 'port', 'proto'].forEach(function(header) {
req.headers['x-forwarded-' + header] =
(req.headers['x-forwarded-' + header] || '') +
(req.headers['x-forwarded-' + header] ? ',' : '') +
values[header];
});
req.headers['x-forwarded-host'] = req.headers['host'] || '';
},
/**
* Does the actual proxying. If `forward` is enabled fires up
* a ForwardStream, same happens for ProxyStream. The request
* just dies otherwise.
*
* @param {ClientRequest} Req Request object
* @param {IncomingMessage} Res Response object
* @param {Object} Options Config object passed to the proxy
*
* @api private
*/
stream: function stream(req, res, options, _, server, clb) {
// And we begin!
server.emit('start', req, res, options.target || options.forward);
var agents = options.followRedirects ? followRedirects : nativeAgents;
var http = agents.http;
var https = agents.https;
if(options.forward) {
// If forward enable, so just pipe the request
var forwardReq = (options.forward.protocol === 'https:' ? https : http).request(
common.setupOutgoing(options.ssl || {}, options, req, 'forward')
);
// error handler (e.g. ECONNRESET, ECONNREFUSED)
// Handle errors on incoming request as well as it makes sense to
var forwardError = createErrorHandler(forwardReq, options.forward);
req.on('error', forwardError);
forwardReq.on('error', forwardError);
(options.buffer || req).pipe(forwardReq);
if(!options.target) { return res.end(); }
}
// Request initalization
var proxyReq = (options.target.protocol === 'https:' ? https : http).request(
common.setupOutgoing(options.ssl || {}, options, req)
);
// Enable developers to modify the proxyReq before headers are sent
proxyReq.on('socket', function(socket) {
if(server) { server.emit('proxyReq', proxyReq, req, res, options); }
});
// allow outgoing socket to timeout so that we could
// show an error page at the initial request
if(options.proxyTimeout) {
proxyReq.setTimeout(options.proxyTimeout, function() {
proxyReq.abort();
});
}
// Ensure we abort proxy if request is aborted
req.on('aborted', function () {
proxyReq.abort();
});
// handle errors in proxy and incoming request, just like for forward proxy
var proxyError = createErrorHandler(proxyReq, options.target);
req.on('error', proxyError);
proxyReq.on('error', proxyError);
function createErrorHandler(proxyReq, url) {
return function proxyError(err) {
if (req.socket.destroyed && err.code === 'ECONNRESET') {
server.emit('econnreset', err, req, res, url);
return proxyReq.abort();
}
if (clb) {
clb(err, req, res, url);
} else {
server.emit('error', err, req, res, url);
}
}
}
(options.buffer || req).pipe(proxyReq);
proxyReq.on('response', function(proxyRes) {
if(server) { server.emit('proxyRes', proxyRes, req, res); }
if(!res.headersSent && !options.selfHandleResponse) {
for(var i=0; i < web_o.length; i++) {
if(web_o[i](req, res, proxyRes, options)) { break; }
}
}
if (!res.finished) {
// Allow us to listen when the proxy has completed
proxyRes.on('end', function () {
if (server) server.emit('end', req, res, proxyRes);
});
// We pipe to the response unless its expected to be handled by the user
if (!options.selfHandleResponse) proxyRes.pipe(res);
} else {
if (server) server.emit('end', req, res, proxyRes);
}
});
}
};
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