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MiniProxy.js
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MiniProxy.js
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var http = require("http");
var net = require("net");
var url = require("url");
var port;
var mpConsole = require("debug")("mproxy");
function MiniProxy(options) {
this.port = options.port || 9393;
this.onServerError = options.onServerError || function() {};
this.onBeforeRequest = options.onBeforeRequest || function() {};
this.onBeforeResponse = options.onBeforeResponse || function() {};
this.onRequestError = options.onRequestError || function() {};
}
MiniProxy.prototype.start = function() {
var server = http.createServer();
server.on("request", this.requestHandler);
server.on("connect", this.connectHandler);
server.on("error", this.onServerError);
server.on("beforeRequest", this.onBeforeRequest);
server.on("beforeResponse", this.onBeforeResponse);
server.on("requestError", this.onRequestError);
server.listen(this.port);
port = this.port;
}
MiniProxy.prototype.requestHandler = function(req, res) {
try {
var self = this; // this -> server
var path = req.headers.path || url.parse(req.url).path;
var requestOptions = {
host: req.headers.host.split(':')[0],
port: req.headers.host.split(':')[1] || 80,
path: path,
method: req.method,
headers: req.headers
};
//check url
if (requestOptions.host == "127.0.0.1" && requestOptions.port == port) {
res.writeHead(200, {
'Content-Type': 'text/plain'
});
res.write("ok");
res.end();
return;
}
//u can change request param here
self.emit("beforeRequest", requestOptions);
requestRemote(requestOptions, req, res, self);
} catch (e) {
mpConsole("requestHandlerError" + e.message);
}
function requestRemote(requestOptions, req, res, proxy) {
var remoteRequest = http.request(requestOptions, function(remoteResponse) {
remoteResponse.headers['proxy-agent'] = 'Easy Proxy 1.0';
// write out headers to handle redirects
res.writeHead(remoteResponse.statusCode, '', remoteResponse.headers);
// u can change resonse here
proxy.emit("beforeResponse", remoteResponse);
remoteResponse.pipe(res);
// Res could not write, but it could close connection
// https://github.com/liyangready/mini-proxy/issues/2
// res.pipe(remoteResponse);
});
remoteRequest.on('error', function(e) {
proxy.emit("requestError", e, req, res);
res.writeHead(502, 'Proxy fetch failed');
// res.end();
// remoteRequest.end();
});
req.pipe(remoteRequest);
// Just in case if socket will be shutdown before http.request will connect
// to the server.
res.on('close', function() {
remoteRequest.abort();
});
}
}
MiniProxy.prototype.connectHandler = function(req, socket, head) {
try {
var self = this;
var requestOptions = {
host: req.url.split(':')[0],
port: req.url.split(':')[1] || 443
};
self.emit("beforeRequest", requestOptions);
connectRemote(requestOptions, socket);
function ontargeterror(e) {
mpConsole(req.url + " Tunnel error: " + e);
_synReply(socket, 502, "Tunnel Error", {}, function() {
try {
socket.end();
}
catch(e) {
mpConsole('end error' + e.message);
}
});
}
function connectRemote(requestOptions, socket) {
var tunnel = net.createConnection(requestOptions, function() {
//format http protocol
_synReply(socket, 200, 'Connection established', {
'Connection': 'keep-alive',
'Proxy-Agent': 'Easy Proxy 1.0'
},
function(error) {
if (error) {
mpConsole("syn error", error.message);
tunnel.end();
socket.end();
return;
}
tunnel.pipe(socket);
socket.pipe(tunnel);
}
);
});
socket.on('error', function(e) {
mpConsole('socket error:', e);
});
tunnel.setNoDelay(true);
tunnel.on('error', ontargeterror);
}
} catch (e) {
mpConsole("connectHandler error: " + e.message);
}
}
function _synReply(socket, code, reason, headers, cb) {
try {
var statusLine = 'HTTP/1.1 ' + code + ' ' + reason + '\r\n';
var headerLines = '';
for (var key in headers) {
headerLines += key + ': ' + headers[key] + '\r\n';
}
socket.write(statusLine + headerLines + '\r\n', 'UTF-8', cb);
} catch (error) {
cb(error);
}
}
module.exports = MiniProxy;