mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2025-03-09 15:40:18 +00:00
Added a lot of the load-balancing support
This commit is contained in:
Ylian Saint-Hilaire
parent
6347eb7e4a
commit
fb5114399f
10 changed files with 2198 additions and 108 deletions
443
multiserver.js
443
multiserver.js
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@ -9,10 +9,381 @@ module.exports.CreateMultiServer = function (parent, args) {
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var obj = {};
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obj.parent = parent;
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obj.crypto = require('crypto');
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obj.peerConfig = parent.config.peers;
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obj.forge = require('node-forge');
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obj.outPeerServers = {}; // Outgoing peer servers
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obj.peerServers = {}; // All connected servers (in & out). Only present in this list if the connection is setup
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// Create a mesh server module that will connect to other servers
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obj.CreatePeerOutServer = function (parent, serverid, url) {
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var obj = {};
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obj.parent = parent;
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obj.serverid = serverid;
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obj.url = url;
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obj.ws = null;
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obj.conn = null;
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obj.certificates = parent.parent.certificates;
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obj.common = require('./common.js');
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obj.forge = require('node-forge');
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obj.crypto = require('crypto');
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obj.pki = obj.forge.pki;
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obj.connectionState = 0;
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obj.retryTimer = null;
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obj.retryBackoff = 0;
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obj.connectHandler = null;
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obj.webCertificatHash = obj.parent.parent.webserver.webCertificatHash;
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obj.agentCertificatHashHex = obj.parent.parent.webserver.agentCertificatHashHex;
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obj.agentCertificatAsn1 = obj.parent.parent.webserver.agentCertificatAsn1;
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obj.peerServerId = null;
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obj.authenticated = 0;
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// Disconnect from the server and/or stop trying
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obj.stop = function () {
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obj.connectionState = 0;
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disconnect();
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}
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// Make one attempt at connecting to the server
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function connect() {
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obj.retryTimer = null;
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obj.connectionState = 1;
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// Get the web socket setup
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const WebSocket = require('websocket');
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var WebSocketClient = require('websocket').client;
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obj.ws = new WebSocketClient();
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obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Connecting to: ' + url + 'meshserver.ashx');
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// Register the connection failed event
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obj.ws.on('connectFailed', function (error) { obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Failed connection'); disconnect(); });
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// Register the connection event
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obj.ws.on('connect', function (connection) {
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obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Connected');
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if (obj.meshScanner != null) { obj.meshScanner.stop(); }
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obj.connectionState |= 2;
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obj.conn = connection;
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obj.nonce = obj.forge.random.getBytesSync(32);
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// If the connection has an error or closes
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obj.conn.on('error', function (error) { obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Error: ' + error); disconnect(); });
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obj.conn.on('close', function () { obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Disconnected'); disconnect(); });
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// Get the peer server's certificate and compute the server public key hash
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if (obj.ws.socket == undefined) return;
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var rawcertbuf = obj.ws.socket.getPeerCertificate().raw, rawcert = '';
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for (var i = 0; i < rawcertbuf.length; i++) { rawcert += String.fromCharCode(rawcertbuf[i]); }
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var serverCert = obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(rawcert));
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obj.serverCertHash = obj.forge.pki.getPublicKeyFingerprint(serverCert.publicKey, { encoding: 'binary', md: obj.forge.md.sha256.create() });
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// If a message is received
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obj.conn.on('message', function (msg) {
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if (msg.type == 'binary') { var msg2 = ""; for (var i = 0; i < msg.binaryData.length; i++) { msg2 += String.fromCharCode(msg.binaryData[i]); } msg = msg2; }
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else if (msg.type == 'utf8') { msg = msg.utf8Data; }
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if (msg.length < 2) return;
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if (msg.charCodeAt(0) == 123) {
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if (obj.connectionState == 15) { processServerData(msg); }
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} else {
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var cmd = obj.common.ReadShort(msg, 0);
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switch (cmd) {
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case 1: {
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// Server authentication request
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if (msg.length != 66) { obj.parent.parent.debug(1, 'OutPeer: BAD MESSAGE(A1)'); return; }
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// Check that the server hash matches the TLS server certificate public key hash
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if (obj.serverCertHash != msg.substring(2, 34)) { obj.parent.parent.debug(1, 'OutPeer: Server hash mismatch.'); disconnect(); return; }
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obj.servernonce = msg.substring(34);
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// Use our agent root private key to sign the ServerHash + ServerNonce + AgentNonce
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var privateKey = obj.forge.pki.privateKeyFromPem(obj.certificates.agent.key);
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var md = obj.forge.md.sha256.create();
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md.update(msg.substring(2), 'binary');
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md.update(obj.nonce, 'binary');
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// Send back our certificate + signature
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agentRootCertificatAsn1 = obj.forge.asn1.toDer(obj.forge.pki.certificateToAsn1(obj.forge.pki.certificateFromPem(obj.certificates.agent.cert))).getBytes();
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obj.conn.send(obj.common.ShortToStr(2) + obj.common.ShortToStr(agentRootCertificatAsn1.length) + agentRootCertificatAsn1 + privateKey.sign(md)); // Command 3, signature
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break;
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}
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case 2: {
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// Server certificate
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var certlen = obj.common.ReadShort(msg, 2), serverCert = null;
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try { serverCert = obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(msg.substring(4, 4 + certlen))); } catch (e) { }
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if (serverCert == null) { obj.parent.parent.debug(1, 'OutPeer: Invalid server certificate.'); disconnect(); return; }
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var serverid = obj.forge.pki.getPublicKeyFingerprint(serverCert.publicKey, { encoding: 'hex', md: obj.forge.md.sha256.create() });
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if (serverid !== obj.agentCertificatHashHex) { obj.parent.parent.debug(1, 'OutPeer: Server hash mismatch.'); disconnect(); return; }
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// Server signature, verify it
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var md = obj.forge.md.sha256.create();
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md.update(obj.serverCertHash, 'binary');
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md.update(obj.nonce, 'binary');
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md.update(obj.servernonce, 'binary');
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if (serverCert.publicKey.verify(md.digest().bytes(), msg.substring(4 + certlen)) == false) { obj.parent.parent.debug(1, 'OutPeer: Server sign check failed.'); disconnect(); return; }
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// Connection is a success, clean up
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delete obj.nonce;
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delete obj.servernonce;
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delete obj.serverCertHash;
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obj.connectionState |= 4;
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obj.retryBackoff = 0; // Set backoff connection timer back to fast.
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obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Verified peer connection to ' + obj.url);
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// Send information about our server to the peer
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if (obj.connectionState == 15) { obj.conn.send(JSON.stringify({ action: 'info', serverid: obj.parent.peerConfig.serverId, dbid: obj.parent.parent.db.identifier, key: obj.parent.serverKey })); }
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//if ((obj.connectionState == 15) && (obj.connectHandler != null)) { obj.connectHandler(1); }
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break;
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}
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case 4: {
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// Server confirmed authentication, we are allowed to send commands to the server
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obj.connectionState |= 8;
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if (obj.connectionState == 15) { obj.conn.send(JSON.stringify({ action: 'info', serverid: obj.parent.peerConfig.serverId, dbid: obj.parent.parent.db.identifier, key: obj.parent.serverKey })); }
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//if ((obj.connectionState == 15) && (obj.connectHandler != null)) { obj.connectHandler(1); }
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break;
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}
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default: {
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obj.parent.parent.debug(1, 'OutPeer ' + obj.serverid + ': Un-handled command: ' + cmd);
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break;
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}
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}
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}
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});
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// Not sure why, but we need to delay the first send
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setTimeout(function () {
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if ((obj.ws == null) || (obj.conn == null)) return;
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// Start authenticate the mesh agent by sending a auth nonce & server TLS cert hash.
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// Send 256 bits SHA256 hash of TLS cert public key + 256 bits nonce
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obj.conn.send(obj.common.ShortToStr(1) + obj.serverCertHash + obj.nonce); // Command 1, hash + nonce
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}, 10);
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});
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obj.ws.connect(obj.url + 'meshserver.ashx', null, null, null, { rejectUnauthorized: false, cert: obj.certificates.agent.cert, key: obj.certificates.agent.key });
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}
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// Disconnect from the server, if we need to, try again with a delay.
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function disconnect() {
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if (obj.authenticated == 3) { obj.parent.ClearPeerServer(obj, obj.peerServerId); obj.authenticated = 0; }
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if ((obj.connectionState == 15) && (obj.connectHandler != null)) { obj.connectHandler(0); }
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if (obj.conn != null) { obj.conn.close(); obj.conn = null; }
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if (obj.ws != null) { obj.ws = null; }
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if (obj.retryTimer != null) { clearTimeout(obj.retryTimer); obj.retryTimer = null; }
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// Re-try connection
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if (obj.connectionState >= 1) { obj.connectionState = 1; if (obj.retryTimer == null) { obj.retryTimer = setTimeout(connect, getConnectRetryTime()); } }
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}
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// Get the next retry time in milliseconds
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function getConnectRetryTime() {
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if (obj.retryBackoff < 30000) { obj.retryBackoff += Math.floor((Math.random() * 3000) + 1000); }
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return obj.retryBackoff;
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}
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// Send a JSON message to the peer server
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obj.send = function (msg) {
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try {
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if (obj.ws == null || obj.conn == null || obj.connectionState != 15) { return; }
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if (typeof msg == 'object') { obj.conn.send(JSON.stringify(msg)); return; }
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if (typeof msg == 'string') { obj.conn.send(msg); return; }
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} catch (e) { }
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}
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// Process incoming peer server JSON data
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function processServerData(msg) {
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var str = msg.toString('utf8');
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if (str[0] == '{') {
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try { command = JSON.parse(str) } catch (e) { obj.parent.parent.debug(1, 'Unable to parse JSON (' + obj.remoteaddr + ').'); return; } // If the command can't be parsed, ignore it.
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if (command.action == 'info') {
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if (obj.authenticated != 3) {
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// We get the peer's serverid and database identifier.
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if ((command.serverid != null) && (command.dbid != null)) {
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if (command.serverid == obj.parent.peerConfig.serverId) { console.log('ERROR: Same server ID, trying to peer with self. (' + obj.url + ', ' + command.serverid + ').'); return; }
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if (command.dbid != obj.parent.parent.db.identifier) { console.log('ERROR: Database ID mismatch. Trying to peer to a server with the wrong database. (' + obj.url + ', ' + command.serverid + ').'); return; }
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obj.peerServerId = command.serverid;
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obj.peerServerKey = command.key;
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obj.authenticated = 3;
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obj.parent.SetupPeerServer(obj, obj.peerServerId);
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}
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}
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} else if (obj.authenticated == 3) {
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// Pass the message to the parent object for processing.
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obj.parent.ProcessPeerServerMessage(obj, obj.peerServerId, command);
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}
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}
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}
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connect();
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return obj;
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}
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// Create a mesh server module that received a connection to another server
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obj.CreatePeerInServer = function (parent, ws, req) {
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var obj = {};
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obj.ws = ws;
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obj.parent = parent;
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obj.common = require('./common.js');
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obj.forge = require('node-forge');
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obj.crypto = require('crypto');
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obj.authenticated = 0;
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obj.remoteaddr = obj.ws._socket.remoteAddress;
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obj.receivedCommands = 0;
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obj.webCertificatHash = obj.parent.parent.webserver.webCertificatHash;
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obj.agentCertificatHashHex = obj.parent.parent.webserver.agentCertificatHashHex;
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obj.agentCertificatAsn1 = obj.parent.parent.webserver.agentCertificatAsn1;
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obj.infoSent = 0;
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obj.peerServerId = null;
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if (obj.remoteaddr.startsWith('::ffff:')) { obj.remoteaddr = obj.remoteaddr.substring(7); }
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// Send a message to the peer server
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obj.send = function (data) {
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try {
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if (typeof data == 'string') { obj.ws.send(new Buffer(data, 'binary')); return; }
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if (typeof data == 'object') { obj.ws.send(JSON.stringify(data)); return; }
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obj.ws.send(data);
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} catch (e) { }
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}
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// Disconnect this server
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obj.close = function (arg) {
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if ((arg == 1) || (arg == null)) { try { obj.ws.close(); obj.parent.parent.debug(1, 'InPeer: Soft disconnect ' + obj.peerServerId + ' (' + obj.remoteaddr + ')'); } catch (e) { console.log(e); } } // Soft close, close the websocket
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if (arg == 2) { try { obj.ws._socket._parent.end(); obj.parent.parent.debug(1, 'InPeer: Hard disconnect ' + obj.peerServerId + ' (' + obj.remoteaddr + ')'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
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if (obj.authenticated == 3) { obj.parent.ClearPeerServer(obj, obj.peerServerId); obj.authenticated = 0; }
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}
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// When data is received from the mesh agent web socket
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ws.on('message', function (msg) {
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if (msg.type == 'binary') { var msg2 = ""; for (var i = 0; i < msg.binaryData.length; i++) { msg2 += String.fromCharCode(msg.binaryData[i]); } msg = msg2; }
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else if (msg.type == 'utf8') { msg = msg.utf8Data; }
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if (msg.length < 2) return;
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if (obj.authenticated >= 2) { // We are authenticated
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if (msg.charCodeAt(0) == 123) { processServerData(msg); }
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if (msg.length < 2) return;
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var cmdid = obj.common.ReadShort(msg, 0);
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// Process binary commands (if any). None right now.
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}
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else if (obj.authenticated < 2) { // We are not authenticated
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var cmd = obj.common.ReadShort(msg, 0);
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if (cmd == 1) {
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// Agent authentication request
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if ((msg.length != 66) || ((obj.receivedCommands & 1) != 0)) return;
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obj.receivedCommands += 1; // Agent can't send the same command twice on the same connection ever. Block DOS attack path.
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// Check that the server hash matches out own web certificate hash
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if (obj.webCertificatHash != msg.substring(2, 34)) { obj.close(); return; }
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// Use our server private key to sign the ServerHash + AgentNonce + ServerNonce
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var privateKey = obj.forge.pki.privateKeyFromPem(obj.parent.parent.certificates.agent.key);
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var md = obj.forge.md.sha256.create();
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md.update(msg.substring(2), 'binary');
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md.update(obj.nonce, 'binary');
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obj.agentnonce = msg.substring(34);
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// Send back our certificate + signature
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obj.send(obj.common.ShortToStr(2) + obj.common.ShortToStr(obj.agentCertificatAsn1.length) + obj.agentCertificatAsn1 + privateKey.sign(md)); // Command 2, certificate + signature
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// Check the agent signature if we can
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if (obj.unauthsign != undefined) {
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if (processAgentSignature(obj.unauthsign) == false) { disconnect(); return; } else { completePeerServerConnection(); }
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}
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}
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else if (cmd == 2) {
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// Agent certificate
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if ((msg.length < 4) || ((obj.receivedCommands & 2) != 0)) return;
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obj.receivedCommands += 2; // Agent can't send the same command twice on the same connection ever. Block DOS attack path.
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// Decode the certificate
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var certlen = obj.common.ReadShort(msg, 2);
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obj.unauth = {};
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obj.unauth.nodeCert = null;
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try { obj.unauth.nodeCert = obj.forge.pki.certificateFromAsn1(obj.forge.asn1.fromDer(msg.substring(4, 4 + certlen))); } catch (e) { return; }
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obj.unauth.nodeid = obj.forge.pki.getPublicKeyFingerprint(obj.unauth.nodeCert.publicKey, { encoding: 'hex', md: obj.forge.md.sha256.create() });
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// Check the agent signature if we can
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if (obj.agentnonce == undefined) { obj.unauthsign = msg.substring(4 + certlen); } else { if (processAgentSignature(msg.substring(4 + certlen)) == false) { disconnect(); return; } }
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completePeerServerConnection();
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}
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else if (cmd == 3) {
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// Agent meshid
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if ((msg.length < 56) || ((obj.receivedCommands & 4) != 0)) return;
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obj.receivedCommands += 4; // Agent can't send the same command twice on the same connection ever. Block DOS attack path.
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completePeerServerConnection();
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}
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}
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});
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// If error, do nothing
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ws.on('error', function (err) { obj.parent.parent.debug(1, 'InPeer: Connection Error: ' + err); });
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// If the mesh agent web socket is closed, clean up.
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ws.on('close', function (req) { obj.parent.parent.debug(1, 'InPeer disconnect ' + obj.nodeid + ' (' + obj.remoteaddr + ')'); obj.close(0); });
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// obj.ws._socket._parent.on('close', function (req) { obj.parent.parent.debug(1, 'Agent TCP disconnect ' + obj.nodeid + ' (' + obj.remoteaddr + ')'); });
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// Start authenticate the mesh agent by sending a auth nonce & server TLS cert hash.
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// Send 256 bits SHA256 hash of TLS cert public key + 256 bits nonce
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obj.nonce = obj.forge.random.getBytesSync(32);
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obj.send(obj.common.ShortToStr(1) + obj.webCertificatHash + obj.nonce); // Command 1, hash + nonce
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// Once we get all the information about an agent, run this to hook everything up to the server
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function completePeerServerConnection() {
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if (obj.authenticated != 1) return;
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obj.send(obj.common.ShortToStr(4));
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obj.send(JSON.stringify({ action: 'info', serverid: obj.parent.peerConfig.serverId, dbid: obj.parent.parent.db.identifier, key: obj.parent.serverKey }));
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obj.authenticated = 2;
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}
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// Verify the agent signature
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function processAgentSignature(msg) {
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var md = obj.forge.md.sha256.create(); // TODO: Switch this to SHA256 on node instead of forge.
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md.update(obj.parent.parent.webserver.webCertificatHash, 'binary');
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md.update(obj.nonce, 'binary');
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md.update(obj.agentnonce, 'binary');
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if (obj.unauth.nodeCert.publicKey.verify(md.digest().bytes(), msg) == false) { return false; }
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if (obj.unauth.nodeid !== obj.agentCertificatHashHex) { return false; }
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// Connection is a success, clean up
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obj.nodeid = obj.unauth.nodeid.toUpperCase();
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delete obj.nonce;
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delete obj.agentnonce;
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delete obj.unauth;
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if (obj.unauthsign) delete obj.unauthsign;
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obj.authenticated = 1;
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return true;
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}
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// Process incoming peer server JSON data
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function processServerData(msg) {
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var str = msg.toString('utf8');
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if (str[0] == '{') {
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try { command = JSON.parse(str) } catch (e) { obj.parent.parent.debug(1, 'Unable to parse JSON (' + obj.remoteaddr + ').'); return; } // If the command can't be parsed, ignore it.
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if (command.action == 'info') {
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if (obj.authenticated != 3) {
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// We get the peer's serverid and database identifier.
|
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if ((command.serverid != null) && (command.dbid != null)) {
|
||||
if (command.serverid == obj.parent.peerConfig.serverId) { console.log('ERROR: Same server ID, trying to peer with self. (' + obj.remoteaddr + ', ' + command.serverid + ').'); return; }
|
||||
if (command.dbid != obj.parent.parent.db.identifier) { console.log('ERROR: Database ID mismatch. Trying to peer to a server with the wrong database. (' + obj.remoteaddr + ', ' + command.serverid + ').'); return; }
|
||||
if (obj.parent.peerConfig.servers[command.serverid] == null) { console.log('ERROR: Unknown peer serverid: ' + command.serverid + ' (' + obj.remoteaddr + ').'); return; }
|
||||
obj.peerServerId = command.serverid;
|
||||
obj.peerServerKey = command.key;
|
||||
obj.authenticated = 3;
|
||||
obj.parent.SetupPeerServer(obj, obj.peerServerId);
|
||||
}
|
||||
}
|
||||
} else if (obj.authenticated == 3) {
|
||||
// Pass the message to the parent object for processing.
|
||||
obj.parent.ProcessPeerServerMessage(obj, obj.peerServerId, command);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return obj;
|
||||
}
|
||||
|
||||
// If we have no peering configuration, don't setup this object
|
||||
if (obj.peerConfig == null) { return null; }
|
||||
|
||||
// Generate a cryptographic key used to encode and decode cookies
|
||||
obj.generateCookieKey = function () {
|
||||
return new Buffer(obj.crypto.randomBytes(32), 'binary').toString('ascii');
|
||||
return new Buffer(obj.crypto.randomBytes(32), 'binary').toString('hex');
|
||||
}
|
||||
|
||||
// Encode an object as a cookie using a key
|
||||
|
|
@ -56,29 +427,67 @@ module.exports.CreateMultiServer = function (parent, args) {
|
|||
|
||||
// Dispatch an event to other MeshCentral2 peer servers
|
||||
obj.DispatchEvent = function (ids, source, event) {
|
||||
// TODO
|
||||
var busmsg = JSON.stringify({ action: 'bus', ids: ids, event: event });
|
||||
for (var serverid in obj.peerServers) { obj.peerServers[serverid].send(busmsg); }
|
||||
}
|
||||
|
||||
// Handle websocket requests on "/meshserver.ashx" from other MeshCentral2 peer servers.
|
||||
obj.handleServerWebSocket = function (ws, req) {
|
||||
Debug(1, 'MeshServer connection open.');
|
||||
// Dispatch a message to other MeshCentral2 peer servers
|
||||
obj.DispatchMessage = function (msg) {
|
||||
for (var serverid in obj.peerServers) { obj.peerServers[serverid].send(msg); }
|
||||
}
|
||||
|
||||
// Handle data from another mesh server
|
||||
ws.on('message', function (msg) {
|
||||
Debug(1, 'MeshServer data of length ' + msg.length);
|
||||
// TODO
|
||||
});
|
||||
// Attempt to connect to all peers
|
||||
obj.ConnectToPeers = function () {
|
||||
for (serverId in obj.peerConfig.servers) {
|
||||
// We will only connect to names that are larger then ours. This way, eveyone has one connection to everyone else (no cross-connections).
|
||||
if ((serverId > obj.peerConfig.serverId) && (obj.peerConfig.servers[serverId].url != null) && (obj.outPeerServers[serverId] == null)) {
|
||||
obj.outPeerServers[serverId] = obj.CreatePeerOutServer(obj, serverId, obj.peerConfig.servers[serverId].url);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// If error, do nothing
|
||||
ws.on('error', function (err) { console.log(err); });
|
||||
// We connected to a peer server, setup everything
|
||||
obj.SetupPeerServer = function (server, peerServerId) {
|
||||
console.log('Connected to peer server ' + peerServerId + '.');
|
||||
obj.peerServers[peerServerId] = server;
|
||||
server.send(JSON.stringify({ action: 'connectivityTable', connectivityTable: obj.parent.peerConnectivityByNode[obj.parent.serverId] }));
|
||||
}
|
||||
|
||||
// Another mesh server connection has closed
|
||||
ws.on('close', function (req) {
|
||||
Debug(1, 'MeshServer connection closed.');
|
||||
// TODO
|
||||
});
|
||||
// We disconnected to a peer server, clean up everything
|
||||
obj.ClearPeerServer = function (server, peerServerId) {
|
||||
console.log('Disconnected from peer server ' + peerServerId + '.');
|
||||
delete obj.peerServers[peerServerId];
|
||||
//delete obj.parent.peerConnectivityByMesh[peerServerId]; // TODO: We will need to re-adjust all of the node power states.
|
||||
var oldList = obj.parent.peerConnectivityByNode[peerServerId];
|
||||
obj.parent.peerConnectivityByNode[peerServerId] = {};
|
||||
obj.parent.UpdateConnectivityState(oldList);
|
||||
}
|
||||
|
||||
// Process a message coming from a peer server
|
||||
obj.ProcessPeerServerMessage = function (server, peerServerId, msg) {
|
||||
//console.log('ProcessPeerServerMessage', peerServerId, msg.action, typeof msg, msg);
|
||||
switch (msg.action) {
|
||||
case 'bus': {
|
||||
obj.parent.DispatchEvent(msg.ids, null, msg.event, true); // Dispatch the peer event
|
||||
break;
|
||||
}
|
||||
case 'connectivityTable': {
|
||||
obj.parent.peerConnectivityByNode[peerServerId] = msg.connectivityTable;
|
||||
obj.parent.UpdateConnectivityState(msg.connectivityTable);
|
||||
break;
|
||||
}
|
||||
case 'SetConnectivityState': {
|
||||
obj.parent.SetConnectivityState(msg.meshid, msg.nodeid, msg.connectTime, msg.connectType, msg.powerState, peerServerId);
|
||||
break;
|
||||
}
|
||||
case 'ClearConnectivityState': {
|
||||
obj.parent.ClearConnectivityState(msg.meshid, msg.nodeid, msg.connectType, peerServerId);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
obj.serverKey = obj.generateCookieKey();
|
||||
setTimeout(function () { obj.ConnectToPeers(); }, 1000); // Delay this a little to make sure we are ready on our side.
|
||||
return obj;
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue