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var httpProxy = module.exports,
extend = require('util')._extend,
parse_url = require('url').parse,
EE3 = require('eventemitter3'),
http = require('http'),
https = require('https'),
web = require('./passes/web-incoming'),
ws = require('./passes/ws-incoming');
httpProxy.Server = ProxyServer;
/**
* Returns a function that creates the loader for
* either `ws` or `web`'s passes.
*
* Examples:
*
* httpProxy.createRightProxy('ws')
* // => [Function]
*
* @param {String} Type Either 'ws' or 'web'
*
* @return {Function} Loader Function that when called returns an iterator for the right passes
*
* @api private
*/
function createRightProxy(type) {
return function(options) {
return function(req, res /*, [head], [opts] */) {
var passes = (type === 'ws') ? this.wsPasses : this.webPasses,
args = [].slice.call(arguments),
cntr = args.length - 1,
head, cbl;
/* optional args parse begin */
if(typeof args[cntr] === 'function') {
cbl = args[cntr];
cntr--;
}
var requestOptions = options;
if(
!(args[cntr] instanceof Buffer) &&
args[cntr] !== res
) {
//Copy global options
requestOptions = extend({}, options);
//Overwrite with request options
extend(requestOptions, args[cntr]);
cntr--;
}
if(args[cntr] instanceof Buffer) {
head = args[cntr];
}
/* optional args parse end */
['target', 'forward'].forEach(function(e) {
if (typeof requestOptions[e] === 'string')
requestOptions[e] = parse_url(requestOptions[e]);
});
if (!requestOptions.target && !requestOptions.forward) {
return this.emit('error', new Error('Must provide a proper URL as target'));
}
for(var i=0; i < passes.length; i++) {
/**
* Call of passes functions
* pass(req, res, options, head)
*
* In WebSockets case the `res` variable
* refer to the connection socket
* pass(req, socket, options, head)
*/
if(passes[i](req, res, requestOptions, head, this, cbl)) { // passes can return a truthy value to halt the loop
break;
}
}
};
};
}
httpProxy.createRightProxy = createRightProxy;
function ProxyServer(options) {
EE3.call(this);
options = options || {};
options.prependPath = options.prependPath === false ? false : true;
this.web = this.proxyRequest = createRightProxy('web')(options);
this.ws = this.proxyWebsocketRequest = createRightProxy('ws')(options);
this.options = options;
this.webPasses = Object.keys(web).map(function(pass) {
return web[pass];
});
this.wsPasses = Object.keys(ws).map(function(pass) {
return ws[pass];
});
this.on('error', this.onError, this);
}
require('util').inherits(ProxyServer, EE3);
ProxyServer.prototype.onError = function (err) {
//
// Remark: Replicate node core behavior using EE3
// so we force people to handle their own errors
//
if(this.listeners('error').length === 1) {
throw err;
}
};
ProxyServer.prototype.listen = function(port, hostname) {
var self = this,
closure = function(req, res) { self.web(req, res); };
this._server = this.options.ssl ?
https.createServer(this.options.ssl, closure) :
http.createServer(closure);
if(this.options.ws) {
this._server.on('upgrade', function(req, socket, head) { self.ws(req, socket, head); });
}
this._server.listen(port, hostname);
return this;
};
ProxyServer.prototype.close = function(callback) {
var self = this;
if (this._server) {
this._server.close(done);
}
// Wrap callback to nullify server after all open connections are closed.
function done() {
self._server = null;
if (callback) {
callback.apply(null, arguments);
}
};
};
ProxyServer.prototype.before = function(type, passName, callback) {
if (type !== 'ws' && type !== 'web') {
throw new Error('type must be `web` or `ws`');
}
var passes = (type === 'ws') ? this.wsPasses : this.webPasses,
i = false;
passes.forEach(function(v, idx) {
if(v.name === passName) i = idx;
})
if(i === false) throw new Error('No such pass');
passes.splice(i, 0, callback);
};
ProxyServer.prototype.after = function(type, passName, callback) {
if (type !== 'ws' && type !== 'web') {
throw new Error('type must be `web` or `ws`');
}
var passes = (type === 'ws') ? this.wsPasses : this.webPasses,
i = false;
passes.forEach(function(v, idx) {
if(v.name === passName) i = idx;
})
if(i === false) throw new Error('No such pass');
passes.splice(i++, 0, callback);
};