whistle/lib/https/index.js

var net = require('net');
var tls = require('tls');
var url = require('url');
var path = require('path');
var util = require('../../util');
var rules = require('../rules');
var parseReq = require('../proxy/parse-req');
var cert = require('./cert');
var DEFAULT_CERT = cert.getDefault();
var LOCALHOST = '127.0.0.1';

function handleWebsocket(socket, wss, callback) {
	var headers = socket.headers;
	var host = headers.host;
	var fullUrl = socket.fullUrl = (wss ? 'wss://' : 'ws://') + headers.host + socket.url;
	var options = url.parse(fullUrl);
	/**
	 * 1. proxy
	 * 2. wss?://
	 * 3. req: delay, timeout, speed, headers
	 * 4. res: delay, timeout, speed, headers
	 */
	var _rules = socket.rules = rules.resolveRules(fullUrl);
	
	rules.resolveHost(fullUrl, function(err, ip) {
		if (err || !ip) {
			return callback(new Error(err || new Error('unsupported non websocket the url: ' + fullUrl)));
		}
		
		var reqSocket = (wss ? tls : net).connect({
			rejectUnauthorized: false,
			host: ip,
			port: options.port || (wss ? 443 : 80)
		}, function () {
			reqSocket.write(socket.getBuffer());
			socket.pipe(reqSocket);
			parseReq(reqSocket, function(err, reqSocket) {
				if (err) {
					return destroy();
				}
				
				socket.write(reqSocket.getBuffer());
				reqSocket.pipe(socket);
			}, true);
		});
		
		
		callback(null, reqSocket);
	}, true);
}

exports.dispatch = function dispatch(socket, app) {
	var config = app.config;
	var reqSocket, buffer;
	var content = '';
	
	function destroy() {
		socket.destroy();
		reqSocket && reqSocket.destroy();
	}
	
	function abortIfUnavailable(socket) {
		return socket.on('error', destroy)
			.on('close', destroy);
	}
	
	abortIfUnavailable(socket);
	socket.on('data', request);
	socket.on('end', request);
	
	function request(chunk) {
		socket.removeListener('data', request);
		socket.removeListener('end', request);
		if (!chunk) {//没有数据
			return destroy();
		}
		
		buffer = buffer ? Buffer.concat([buffer, chunk]) : chunk;
		if (/upgrade\s*:\s*websocket/i.test(buffer && buffer.toString())) { //ws
			parseReq(socket, function(err, socket) {
				if (err) {
					return destroy();
				}
				handleWebsocket(socket, false, function(err, req) {
					if (err) {
						return destroy();
					}
					reqSocket = req;
					abortIfUnavailable(reqSocket);
				});
			}, buffer, true);
			buffer = null;
		} else {
			reqSocket = net.connect(config.httpsport, LOCALHOST, function() {
				reqSocket.write(buffer);
	            reqSocket.pipe(socket).pipe(reqSocket);
	            buffer = null;
	        });
			abortIfUnavailable(reqSocket);
		}
	}

};

exports.createServer = function createServer(app) {
	var config = app.config;
	var server = tls.createServer({
		SNICallback: function(hostname, callback) {
			if (typeof callback != 'function') {
				return cert.getCert();
			}
			
			callback(null, cert.getCert());
		},
		key: DEFAULT_CERT[0],
		cert: DEFAULT_CERT[1]
	},function(socket) {
		var reqSocket;
		function destroy() {
			socket.destroy();
			reqSocket && reqSocket.destroy();
		}
		
		function abortIfUnavailable(socket) {
			return socket.on('error', destroy)
				.on('close', destroy);
		}
		
		abortIfUnavailable(socket);
		parseReq(socket, function(err, socket) {
			if (err) {
				return destroy();
			}
			//wss
			
			var headers = socket.headers;
			if (headers.upgrade && headers.upgrade.toLowerCase() == 'websocket') {
				handleWebsocket(socket, true, function(err, req) {
					if (err) {
						return destroy();
					}
					reqSocket = req;
					abortIfUnavailable(reqSocket);
				});
			} else {
				//https
				reqSocket = net.connect(config.port, LOCALHOST, function() {
					headers[util.HTTPS_FIELD] = 1;
					reqSocket.write(socket.getBuffer(headers));
					socket.pipe(reqSocket);
					reqSocket.pipe(socket);
		        });
				abortIfUnavailable(reqSocket);
			}
		}, true);
		
	}).listen(config.httpsport, 'localhost')
		.on('error', util.noop);
};