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PhabricatorIRCProtocolAdapter.php
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Mon, Jul 15, 09:58

PhabricatorIRCProtocolAdapter.php
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<?php
final class PhabricatorIRCProtocolAdapter extends PhabricatorProtocolAdapter {
private $socket;
private $writeBuffer;
private $readBuffer;
private $nickIncrement = 0;
public function getServiceType() {
return 'IRC';
}
public function getServiceName() {
return $this->getConfig('network', $this->getConfig('server'));
}
// Hash map of command translations
public static $commandTranslations = array(
'PRIVMSG' => 'MESSAGE',
);
public function connect() {
$nick = $this->getConfig('nick', 'phabot');
$server = $this->getConfig('server');
$port = $this->getConfig('port', 6667);
$pass = $this->getConfig('pass');
$ssl = $this->getConfig('ssl', false);
$user = $this->getConfig('user', $nick);
if (!preg_match('/^[A-Za-z0-9_`[{}^|\]\\-]+$/', $nick)) {
throw new Exception(
pht(
"Nickname '%s' is invalid!",
$nick));
}
$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(pht('Failed to connect, #%d: %s', $errno, $error));
}
$ok = stream_set_blocking($socket, false);
if (!$ok) {
throw new Exception(pht('Failed to set stream nonblocking.'));
}
$this->socket = $socket;
if ($pass) {
$this->write("PASS {$pass}");
}
$this->write("NICK {$nick}");
$this->write("USER {$user} 0 * :{$user}");
}
public function getNextMessages($poll_frequency) {
$messages = array();
$read = array($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) {
// We may have been interrupted by a signal, like a SIGINT. Try
// selecting again. If the second select works, conclude that the failure
// was most likely because we were signaled.
$ok = @stream_select($read, $write, $except, $timeout_sec = 0);
if ($ok === false) {
throw new Exception(pht('%s failed!', 'stream_select()'));
}
}
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(pht('Remote host closed connection.'));
}
do {
$data = fread($this->socket, 4096);
if ($data === false) {
throw new Exception(pht('%s failed!', 'fread()'));
} else {
$messages[] = id(new PhabricatorBotMessage())
->setCommand('LOG')
->setBody('>>> '.$data);
$this->readBuffer .= $data;
}
} while (strlen($data));
}
if ($write) {
do {
$len = fwrite($this->socket, $this->writeBuffer);
if ($len === false) {
throw new Exception(pht('%s failed!', 'fwrite()'));
} else if ($len === 0) {
break;
} else {
$messages[] = id(new PhabricatorBotMessage())
->setCommand('LOG')
->setBody('>>> '.substr($this->writeBuffer, 0, $len));
$this->writeBuffer = substr($this->writeBuffer, $len);
}
} while (strlen($this->writeBuffer));
}
while (($m = $this->processReadBuffer()) !== false) {
if ($m !== null) {
$messages[] = $m;
}
}
return $messages;
}
private function write($message) {
$this->writeBuffer .= $message."\r\n";
return $this;
}
public function writeMessage(PhabricatorBotMessage $message) {
switch ($message->getCommand()) {
case 'MESSAGE':
case 'PASTE':
$name = $message->getTarget()->getName();
$body = $message->getBody();
$this->write("PRIVMSG {$name} :{$body}");
return true;
default:
return false;
}
}
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);
$pattern =
'/^'.
'(?::(?P<sender>(\S+?))(?:!\S*)? )?'. // This may not be present.
'(?P<command>[A-Z0-9]+) '.
'(?P<data>.*)'.
'$/';
$matches = null;
if (!preg_match($pattern, $message, $matches)) {
throw new Exception("Unexpected message from server: {$message}");
}
if ($this->handleIRCProtocol($matches)) {
return null;
}
$command = $this->getBotCommand($matches['command']);
list($target, $body) = $this->parseMessageData($command, $matches['data']);
if (!strlen($matches['sender'])) {
$sender = null;
} else {
$sender = id(new PhabricatorBotUser())
->setName($matches['sender']);
}
$bot_message = id(new PhabricatorBotMessage())
->setSender($sender)
->setCommand($command)
->setTarget($target)
->setBody($body);
return $bot_message;
}
private function handleIRCProtocol(array $matches) {
$data = $matches['data'];
switch ($matches['command']) {
case '433': // Nickname already in use
// If we receive this error, try appending "-1", "-2", etc. to the nick
$this->nickIncrement++;
$nick = $this->getConfig('nick', 'phabot').'-'.$this->nickIncrement;
$this->write("NICK {$nick}");
return true;
case '422': // Error - no MOTD
case '376': // End of MOTD
$nickpass = $this->getConfig('nickpass');
if ($nickpass) {
$this->write("PRIVMSG nickserv :IDENTIFY {$nickpass}");
}
$join = $this->getConfig('join');
if (!$join) {
throw new Exception(pht('Not configured to join any channels!'));
}
foreach ($join as $channel) {
$this->write("JOIN {$channel}");
}
return true;
case 'PING':
$this->write("PONG {$data}");
return true;
}
return false;
}
private function getBotCommand($irc_command) {
if (isset(self::$commandTranslations[$irc_command])) {
return self::$commandTranslations[$irc_command];
}
// We have no translation for this command, use as-is
return $irc_command;
}
private function parseMessageData($command, $data) {
switch ($command) {
case 'MESSAGE':
$matches = null;
if (preg_match('/^(\S+)\s+:?(.*)$/', $data, $matches)) {
$target_name = $matches[1];
if (strncmp($target_name, '#', 1) === 0) {
$target = id(new PhabricatorBotChannel())
->setName($target_name);
} else {
$target = id(new PhabricatorBotUser())
->setName($target_name);
}
return array(
$target,
rtrim($matches[2], "\r\n"),
);
}
break;
}
// By default we assume there is no target, only a body
return array(
null,
$data,
);
}
public function disconnect() {
// NOTE: FreeNode doesn't show quit messages if you've recently joined a
// channel, presumably to prevent some kind of abuse. If you're testing
// this, you may need to stay connected to the network for a few minutes
// before it works. If you disconnect too quickly, the server will replace
// your message with a "Client Quit" message.
$quit = $this->getConfig('quit', pht('Shutting down.'));
$this->write("QUIT :{$quit}");
// Flush the write buffer.
while (strlen($this->writeBuffer)) {
$this->getNextMessages(0);
}
@fclose($this->socket);
$this->socket = null;
}
}

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