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| var thinkHttp = thinkRequire('Http');
var url = require('url');
var websocket = require('websocket-driver');
var querystring = require('querystring');
var WebSocket = module.exports = Class(function(){
'use strict';
/**
* socket初始化id
* @type {Number}
*/
var socketId = 1000;
return {
init: function(httpServer, app){
this.httpServer = httpServer;
this.app = app;
},
/**
* 检测origin是否合法
* @param {[type]} origin [description]
* @return {[type]} [description]
*/
originIsAllowed: function(origin){
var allowOrigins = C('websocket_allow_origin');
if (!allowOrigins) {
return true;
}
var info = url.parse(origin);
var hostname = info.hostname;
if (isString(allowOrigins) && allowOrigins === hostname) {
return true;
}else if (isArray(allowOrigins) && allowOrigins.indexOf(hostname) > -1) {
return true;
}else if (isFunction(allowOrigins)) {
return allowOrigins(hostname, info);
}
return false;
},
/**
* 选择子协议
* @param {[type]} protocolFullCaseMap [description]
* @return {[type]} [description]
*/
getSubProtocal: function(request){
var selectedProtocal = C('websocket_sub_protocal');
if (isFunction(selectedProtocal)) {
var protocals = (request.headers['sec-websocket-protocol'] || '').split(/,\s*/);
selectedProtocal = selectedProtocal(protocals);
}
return selectedProtocal;
},
/**
* 建立连接处理
* @param {[type]} request [description]
* @return {[type]} [description]
*/
openHandle: function(request, protocal){
if (request.url === '/') {
return getPromise({});
}
var deferred = getDefer();
var fn = function(){};
var cookies = '';
var res = {setHeader: function(name, value){
if (name === 'Set-Cookie' && value) {
cookies = value;
}
}, end: fn, write: fn};
var self = this;
thinkHttp(request, res).run().then(function(http){
http.websocket = request.socket;
//子协议
http.websocket_sub_protocal = protocal;
self.app.listener(http).then(function(){
http.sendCookie();
deferred.resolve({
cookie: cookies,
http: http
});
}).catch(function(err){
deferred.reject(err);
})
});
return deferred.promise;
},
/**
* 消息处理
* @return {[type]} [description]
*/
messageHandle: function(message, connection, app){
//解析数据
try{
message = JSON.parse(message);
}catch(e){
connection.socket.send(WebSocket.ERROR_MESSAGE.INVALID_JSON, message + ' is not valid json');
return;
}
if (message.jsonrpc !== '2.0') {
connection.socket.send(WebSocket.ERROR_MESSAGE.INVALID_JSONRPC, 'data.jsonrpc must be 2.0');
return;
}
var method = message.method;
if (!method) {
connection.socket.send(WebSocket.ERROR_MESSAGE.INVALID_METHOD, 'data.method is not valid');
return;
}
var pars = message.params || '';
var headers = {};
if (isObject(pars.headers)) {
headers = pars.headers;
pars = pars.data;
}
if (isObject(pars)) {
method += (method.indexOf('?') > -1 ? '&' : '?') + querystring.stringify(pars)
}
var self = this;
var data = {
host: '',
url: method,
headers: headers,
write: function(data, encoding, errMsg){
var pars = self.getRPCData(JSON.parse(data), errMsg);
pars.id = message.id;
connection.socket.send(JSON.stringify(pars));
},
end: function(){
connection.close();
}
}
var defaultHttp = thinkHttp.getDefaultHttp(data);
var httpInstance = thinkHttp(defaultHttp.req, defaultHttp.res);
//将websocket实例添加到http对象上
httpInstance.http.websocket = connection.socket;
httpInstance.run().then(app.listener);
},
/**
* 获取rpc数据对象
* @param {[type]} data [description]
* @param {[type]} errMsg [description]
* @return {[type]} [description]
*/
getRPCData: function(data, errMsg){
var pars = {jsonrpc: '2.0'};
if (errMsg) {
pars.error = {code: data, message: errMsg};
}else{
pars.result = data;
}
return pars;
},
/**
* 建立连接
* @param {[type]} request [description]
* @return {[type]} [description]
*/
open: function(request){
var self = this;
var protocal = this.getSubProtocal(request);
return this.openHandle(request, protocal).then(function(data){
var driver = websocket.http(request, {
protocols: protocal
});
var socket = driver.socket = request.socket;
driver.send = function(data){
return isBuffer(data) ? driver.binary(data) : driver.text(data);
}
socket.close = function(){
driver.close();
}
socket.connection = driver;
if (!socket.send) {
socket.send = function(data, errMsg){
var pars = self.getRPCData(data, errMsg);
driver.text(JSON.stringify(pars));
}
}
socket.pipe(driver.io).pipe(socket);
var messageHandle = C('websocket_message_handle');
driver.messages.on('data', function(message) {
socket.activeTime = Date.now();
var type = isBuffer(message) ? 'buffer' : 'text';
if (isFunction(messageHandle)) {
messageHandle(message, driver, self.app, type);
}else{
self.messageHandle(message, driver, self.app, type);
}
});
driver.on('close', function(){
return data.http && data.http.emit('websocket.close');
})
//设置cookie
if (!isEmpty(data.cookie)) {
driver.setHeader('Set-Cookie', data.cookie);
}
driver.start();
return driver;
})
},
/**
* 执行
* @return {[type]} [description]
*/
run: function(){
var self = this;
this.httpServer.on('upgrade', function(request, socket) {
if (!websocket.isWebSocket(request)){
return;
}
var origin = request.headers.origin;
if (!self.originIsAllowed(origin)) {
return;
}
socket.id = socketId++;
socket.activeTime = Date.now();
return self.open(request);
});
}
}
});
/**
* 错误信息
* @type {Object}
*/
WebSocket.ERROR_MESSAGE = {
TYPE_ERROR: -100001, //数据类型错误
INVALID_JSON: -100002, //不是合法的json
INVALID_JSONRPC: -100003, //不是jsonrpc数据格式
INVALID_METHOD: -100004 //请求方法不合法
} |