Fully end to end encrypted anonymous chat program. Server only stores public key lookup for users and the encrypted messages. No credentials are transfered to the server, but kept in local browser storage. This allows 100% safe chatting. https://safechat.ch
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var Crypto = require('crypto');
var Net = require('net');
var tls = require('tls');
var ConnectionConfig = require('./ConnectionConfig');
var Protocol = require('./protocol/Protocol');
var SqlString = require('./protocol/SqlString');
var Query = require('./protocol/sequences/Query');
var EventEmitter = require('events').EventEmitter;
var Util = require('util');
module.exports = Connection;
Util.inherits(Connection, EventEmitter);
function Connection(options) {
EventEmitter.call(this);
this.config = options.config;
this._socket = options.socket;
this._protocol = new Protocol({config: this.config, connection: this});
this._connectCalled = false;
this.state = "disconnected";
this.threadId = null;
}
function bindToCurrentDomain(callback) {
if (!callback) return;
var domain = process.domain;
return domain
? domain.bind(callback)
: callback;
}
Connection.createQuery = function createQuery(sql, values, callback) {
if (sql instanceof Query) {
return sql;
}
var cb = bindToCurrentDomain(callback);
var options = {};
if (typeof sql === 'function') {
cb = bindToCurrentDomain(sql);
return new Query(options, cb);
}
if (typeof sql === 'object') {
for (var prop in sql) {
options[prop] = sql[prop];
}
if (typeof values === 'function') {
cb = bindToCurrentDomain(values);
} else if (values !== undefined) {
options.values = values;
}
return new Query(options, cb);
}
options.sql = sql;
options.values = values;
if (typeof values === 'function') {
cb = bindToCurrentDomain(values);
options.values = undefined;
}
if (cb === undefined && callback !== undefined) {
throw new TypeError('argument callback must be a function when provided');
}
return new Query(options, cb);
};
Connection.prototype.connect = function connect(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
if (!this._connectCalled) {
this._connectCalled = true;
// Connect either via a UNIX domain socket or a TCP socket.
this._socket = (this.config.socketPath)
? Net.createConnection(this.config.socketPath)
: Net.createConnection(this.config.port, this.config.host);
var connection = this;
this._protocol.on('data', function(data) {
connection._socket.write(data);
});
this._socket.on('data', function(data) {
connection._protocol.write(data);
});
this._protocol.on('end', function() {
connection._socket.end();
});
this._socket.on('end', function(err) {
connection._protocol.end();
});
this._socket.on('error', this._handleNetworkError.bind(this));
this._socket.on('connect', this._handleProtocolConnect.bind(this));
this._protocol.on('handshake', this._handleProtocolHandshake.bind(this));
this._protocol.on('unhandledError', this._handleProtocolError.bind(this));
this._protocol.on('drain', this._handleProtocolDrain.bind(this));
this._protocol.on('end', this._handleProtocolEnd.bind(this));
this._protocol.on('enqueue', this._handleProtocolEnqueue.bind(this));
if (this.config.connectTimeout) {
var handleConnectTimeout = this._handleConnectTimeout.bind(this);
this._socket.setTimeout(this.config.connectTimeout, handleConnectTimeout);
this._socket.once('connect', function() {
this.setTimeout(0, handleConnectTimeout);
});
}
}
this._protocol.handshake(options, bindToCurrentDomain(callback));
};
Connection.prototype.changeUser = function changeUser(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
this._implyConnect();
var charsetNumber = (options.charset)
? ConnectionConfig.getCharsetNumber(options.charset)
: this.config.charsetNumber;
return this._protocol.changeUser({
user : options.user || this.config.user,
password : options.password || this.config.password,
database : options.database || this.config.database,
timeout : options.timeout,
charsetNumber : charsetNumber,
currentConfig : this.config
}, bindToCurrentDomain(callback));
};
Connection.prototype.beginTransaction = function beginTransaction(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
options = options || {};
options.sql = 'START TRANSACTION';
options.values = null;
return this.query(options, callback);
};
Connection.prototype.commit = function commit(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
options = options || {};
options.sql = 'COMMIT';
options.values = null;
return this.query(options, callback);
};
Connection.prototype.rollback = function rollback(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
options = options || {};
options.sql = 'ROLLBACK';
options.values = null;
return this.query(options, callback);
};
Connection.prototype.query = function query(sql, values, cb) {
var query = Connection.createQuery(sql, values, cb);
query._connection = this;
if (!(typeof sql == 'object' && 'typeCast' in sql)) {
query.typeCast = this.config.typeCast;
}
if (query.sql) {
query.sql = this.format(query.sql, query.values);
}
this._implyConnect();
return this._protocol._enqueue(query);
};
Connection.prototype.ping = function ping(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
this._implyConnect();
this._protocol.ping(options, bindToCurrentDomain(callback));
};
Connection.prototype.statistics = function statistics(options, callback) {
if (!callback && typeof options === 'function') {
callback = options;
options = {};
}
this._implyConnect();
this._protocol.stats(options, bindToCurrentDomain(callback));
};
Connection.prototype.end = function end(options, callback) {
var cb = callback;
var opts = options;
if (!callback && typeof options === 'function') {
cb = options;
opts = null;
}
// create custom options reference
opts = Object.create(opts || null);
if (opts.timeout === undefined) {
// default timeout of 30 seconds
opts.timeout = 30000;
}
this._implyConnect();
this._protocol.quit(opts, bindToCurrentDomain(cb));
};
Connection.prototype.destroy = function() {
this.state = "disconnected";
this._implyConnect();
this._socket.destroy();
this._protocol.destroy();
};
Connection.prototype.pause = function() {
this._socket.pause();
this._protocol.pause();
};
Connection.prototype.resume = function() {
this._socket.resume();
this._protocol.resume();
};
Connection.prototype.escape = function(value) {
return SqlString.escape(value, false, this.config.timezone);
};
Connection.prototype.escapeId = function escapeId(value) {
return SqlString.escapeId(value, false);
};
Connection.prototype.format = function(sql, values) {
if (typeof this.config.queryFormat == "function") {
return this.config.queryFormat.call(this, sql, values, this.config.timezone);
}
return SqlString.format(sql, values, this.config.stringifyObjects, this.config.timezone);
};
if (tls.TLSSocket) {
// 0.11+ environment
Connection.prototype._startTLS = function _startTLS(onSecure) {
var secureContext = tls.createSecureContext({
ca : this.config.ssl.ca,
cert : this.config.ssl.cert,
ciphers : this.config.ssl.ciphers,
key : this.config.ssl.key,
passphrase : this.config.ssl.passphrase
});
// "unpipe"
this._socket.removeAllListeners('data');
this._protocol.removeAllListeners('data');
// socket <-> encrypted
var rejectUnauthorized = this.config.ssl.rejectUnauthorized;
var secureSocket = new tls.TLSSocket(this._socket, {
rejectUnauthorized : rejectUnauthorized,
requestCert : true,
secureContext : secureContext,
isServer : false
});
// cleartext <-> protocol
secureSocket.pipe(this._protocol);
this._protocol.on('data', function(data) {
secureSocket.write(data);
});
secureSocket.on('secure', function() {
onSecure(rejectUnauthorized ? this.ssl.verifyError() : null);
});
// start TLS communications
secureSocket._start();
};
} else {
// pre-0.11 environment
Connection.prototype._startTLS = function _startTLS(onSecure) {
// before TLS:
// _socket <-> _protocol
// after:
// _socket <-> securePair.encrypted <-> securePair.cleartext <-> _protocol
var credentials = Crypto.createCredentials({
ca : this.config.ssl.ca,
cert : this.config.ssl.cert,
ciphers : this.config.ssl.ciphers,
key : this.config.ssl.key,
passphrase : this.config.ssl.passphrase
});
var rejectUnauthorized = this.config.ssl.rejectUnauthorized;
var securePair = tls.createSecurePair(credentials, false, true, rejectUnauthorized);
// "unpipe"
this._socket.removeAllListeners('data');
this._protocol.removeAllListeners('data');
// socket <-> encrypted
securePair.encrypted.pipe(this._socket);
this._socket.on('data', function(data) {
securePair.encrypted.write(data);
});
// cleartext <-> protocol
securePair.cleartext.pipe(this._protocol);
this._protocol.on('data', function(data) {
securePair.cleartext.write(data);
});
securePair.on('secure', function() {
if (!rejectUnauthorized) {
onSecure();
return;
}
var verifyError = this.ssl.verifyError();
var err = verifyError;
// node.js 0.6 support
if (typeof err === 'string') {
err = new Error(verifyError);
err.code = verifyError;
}
onSecure(err);
});
};
}
Connection.prototype._handleConnectTimeout = function() {
if (this._socket) {
this._socket.setTimeout(0);
this._socket.destroy();
}
var err = new Error('connect ETIMEDOUT');
err.errorno = 'ETIMEDOUT';
err.code = 'ETIMEDOUT';
err.syscall = 'connect';
this._handleNetworkError(err);
};
Connection.prototype._handleNetworkError = function(err) {
this._protocol.handleNetworkError(err);
};
Connection.prototype._handleProtocolError = function(err) {
this.state = "protocol_error";
this.emit('error', err);
};
Connection.prototype._handleProtocolDrain = function() {
this.emit('drain');
};
Connection.prototype._handleProtocolConnect = function() {
this.state = "connected";
this.emit('connect');
};
Connection.prototype._handleProtocolHandshake = function _handleProtocolHandshake(packet) {
this.state = "authenticated";
this.threadId = packet.threadId;
};
Connection.prototype._handleProtocolEnd = function(err) {
this.state = "disconnected";
this.emit('end', err);
};
Connection.prototype._handleProtocolEnqueue = function _handleProtocolEnqueue(sequence) {
this.emit('enqueue', sequence);
};
Connection.prototype._implyConnect = function() {
if (!this._connectCalled) {
this.connect();
}
};