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PhabricatorIRCBot.php
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Wed, Nov 27, 02:11

PhabricatorIRCBot.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Simple IRC bot which runs as a Phabricator daemon. Although this bot is
* somewhat useful, it is also intended to serve as a demo of how to write
* "system agents" which communicate with Phabricator over Conduit, so you can
* script system interactions and integrate with other systems.
*
* NOTE: This is super janky and experimental right now.
*
* @group irc
*/
final class PhabricatorIRCBot extends PhabricatorDaemon {
private $socket;
private $handlers;
private $writeBuffer;
private $readBuffer;
private $conduit;
public function run() {
$argv = $this->getArgv();
if (count($argv) !== 1) {
throw new Exception("usage: PhabricatorIRCBot <json_config_file>");
}
$json_raw = Filesystem::readFile($argv[0]);
$config = json_decode($json_raw, true);
if (!is_array($config)) {
throw new Exception("File '{$argv[0]}' is not valid JSON!");
}
$server = idx($config, 'server');
$port = idx($config, 'port', 6667);
$join = idx($config, 'join', array());
$handlers = idx($config, 'handlers', array());
$pass = idx($config, 'pass');
$nick = idx($config, 'nick', 'phabot');
$user = idx($config, 'user', $nick);
$ssl = idx($config, 'ssl', false);
$nickpass = idx($config, 'nickpass');
if (!preg_match('/^[A-Za-z0-9_`[{}^|\]\\-]+$/', $nick)) {
throw new Exception(
"Nickname '{$nick}' is invalid!");
}
if (!$join) {
throw new Exception("No channels to 'join' in config!");
}
foreach ($handlers as $handler) {
$obj = newv($handler, array($this));
$this->handlers[] = $obj;
}
$conduit_uri = idx($config, 'conduit.uri');
if ($conduit_uri) {
$conduit_user = idx($config, 'conduit.user');
$conduit_cert = idx($config, 'conduit.cert');
$conduit = new ConduitClient($conduit_uri);
$response = $conduit->callMethodSynchronous(
'conduit.connect',
array(
'client' => 'PhabricatorIRCBot',
'clientVersion' => '1.0',
'clientDescription' => php_uname('n').':'.$nick,
'user' => $conduit_user,
'certificate' => $conduit_cert,
));
$this->conduit = $conduit;
}
$errno = null;
$error = null;
if (!$ssl) {
$socket = fsockopen($server, $port, $errno, $error);
} else {
$socket = fsockopen('ssl://'.$server, $port, $errno, $error);
}
if (!$socket) {
throw new Exception("Failed to connect, #{$errno}: {$error}");
}
$ok = stream_set_blocking($socket, false);
if (!$ok) {
throw new Exception("Failed to set stream nonblocking.");
}
$this->socket = $socket;
$this->writeCommand('USER', "{$user} 0 * :{$user}");
if ($pass) {
$this->writeCommand('PASS', "{$pass}");
}
if ($nickpass) {
$this->writeCommand("NickServ IDENTIFY ", "{$nickpass}");
}
$this->writeCommand('NICK', "{$nick}");
foreach ($join as $channel) {
$this->writeCommand('JOIN', "{$channel}");
}
$this->runSelectLoop();
}
private function runSelectLoop() {
do {
$this->stillWorking();
$read = array($this->socket);
if (strlen($this->writeBuffer)) {
$write = array($this->socket);
} else {
$write = array();
}
$except = array();
$ok = @stream_select($read, $write, $except, $timeout_sec = 1);
if ($ok === false) {
throw new Exception(
"socket_select() failed: ".socket_strerror(socket_last_error()));
}
if ($read) {
// Test for connection termination; in PHP, fread() off a nonblocking,
// closed socket is empty string.
if (feof($this->socket)) {
// This indicates the connection was terminated on the other side,
// just exit via exception and let the overseer restart us after a
// delay so we can reconnect.
throw new Exception("Remote host closed connection.");
}
do {
$data = fread($this->socket, 4096);
if ($data === false) {
throw new Exception("fread() failed!");
} else {
$this->debugLog(true, $data);
$this->readBuffer .= $data;
}
} while (strlen($data));
}
if ($write) {
do {
$len = fwrite($this->socket, $this->writeBuffer);
if ($len === false) {
throw new Exception("fwrite() failed!");
} else {
$this->debugLog(false, substr($this->writeBuffer, 0, $len));
$this->writeBuffer = substr($this->writeBuffer, $len);
}
} while (strlen($this->writeBuffer));
}
do {
$routed_message = $this->processReadBuffer();
} while ($routed_message);
} while (true);
}
private function write($message) {
$this->writeBuffer .= $message;
return $this;
}
public function writeCommand($command, $message) {
return $this->write($command.' '.$message."\r\n");
}
private function processReadBuffer() {
$until = strpos($this->readBuffer, "\r\n");
if ($until === false) {
return false;
}
$message = substr($this->readBuffer, 0, $until);
$this->readBuffer = substr($this->readBuffer, $until + 2);
$pattern =
'/^'.
'(?:(?P<sender>:(\S+)) )?'. // This may not be present.
'(?P<command>[A-Z0-9]+) '.
'(?P<data>.*)'.
'$/';
$matches = null;
if (!preg_match($pattern, $message, $matches)) {
throw new Exception("Unexpected message from server: {$message}");
}
$irc_message = new PhabricatorIRCMessage(
idx($matches, 'sender'),
$matches['command'],
$matches['data']);
$this->routeMessage($irc_message);
return true;
}
private function routeMessage(PhabricatorIRCMessage $message) {
foreach ($this->handlers as $handler) {
try {
$handler->receiveMessage($message);
} catch (Exception $ex) {
phlog($ex);
}
}
}
public function __destroy() {
$this->write("QUIT Goodbye.\r\n");
fclose($this->socket);
}
private function debugLog($is_read, $message) {
echo $is_read ? '<<< ' : '>>> ';
echo addcslashes($message, "\0..\37\177..\377");
echo "\n";
}
public function getConduit() {
if (empty($this->conduit)) {
throw new Exception(
"This bot is not configured with a Conduit uplink. Set 'conduit.uri', ".
"'conduit.user' and 'conduit.cert' in the configuration to connect.");
}
return $this->conduit;
}
}

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