#!/usr/bin/env php
<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

# Abort if called from a web server
if (isset($_SERVER) && array_key_exists('REQUEST_METHOD', $_SERVER)) {
	print "This script must be run from the command line\n";
	exit();
}

define('INSTALLDIR', realpath(dirname(__FILE__) . '/..'));
define('LACONICA', true);

require_once(INSTALLDIR . '/lib/common.php');
require_once(INSTALLDIR . '/lib/jabber.php');
require_once(INSTALLDIR . '/lib/daemon.php');

set_error_handler('common_error_handler');

# This is kind of clunky; we create a class to call the global functions
# in jabber.php, which create a new XMPP class. A more elegant (?) solution
# might be to use make this a subclass of XMPP.

class XMPPDaemon extends Daemon {

	function XMPPDaemon($resource=NULL) {
		static $attrs = array('server', 'port', 'user', 'password', 'host');

		foreach ($attrs as $attr)
		{
			$this->$attr = common_config('xmpp', $attr);
		}

		if ($resource) {
			$this->resource = $resource;
		} else {
			$this->resource = common_config('xmpp', 'resource') . 'daemon';
		}

		$this->log(LOG_INFO, "INITIALIZE XMPPDaemon {$this->user}@{$this->server}/{$this->resource}");
	}

	function connect() {

		$connect_to = ($this->host) ? $this->host : $this->server;

		$this->log(LOG_INFO, "Connecting to $connect_to on port $this->port");

		$this->conn = jabber_connect($this->resource);

		if (!$this->conn) {
			return false;
		}
		
		$this->conn->setReconnectTimeout(600);
		
		jabber_send_presence("Send me a message to post a notice", 'available',
							 NULL, 'available', 100);
		return !$this->conn->isDisconnected();
	}

	function name() {
		return strtolower('xmppdaemon.'.$this->resource);
	}
	
	function run() {
		if ($this->connect()) {
			
			$this->conn->addEventHandler('message', 'handle_message', $this);
			$this->conn->addEventHandler('presence', 'handle_presence', $this);
			$this->conn->addEventHandler('reconnect', 'handle_reconnect', $this);
			
			$this->conn->process();
		}
	}

	function handle_reconnect(&$pl) {
		$this->conn->processUntil('session_start');
		$this->conn->presence('Send me a message to post a notice', 'available', NULL, 'available', 100);
	}
	
	function get_user($from) {
		$user = User::staticGet('jabber', jabber_normalize_jid($from));
		return $user;
	}

	function handle_message(&$pl) {
		if ($pl['type'] != 'chat') {
			return;
		}
		if (mb_strlen($pl['body']) == 0) {
			return;
		}

		$from = jabber_normalize_jid($pl['from']);

		# Forwarded from another daemon (probably a broadcaster) for
		# us to handle

		if ($this->is_self($from)) {
			$from = $this->get_ofrom($pl);
			if (is_null($from) || $this->is_self($from)) {
				return;
			}
		}

		$user = $this->get_user($from);

		if (!$user) {
			$this->from_site($from, 'Unknown user; go to ' .
							 common_local_url('imsettings') .
							 ' to add your address to your account');
			$this->log(LOG_WARNING, 'Message from unknown user ' . $from);
			return;
		}
		if ($this->handle_command($user, $pl['body'])) {
			return;
		} else if ($this->is_autoreply($pl['body'])) {
			$this->log(LOG_INFO, 'Ignoring auto reply from ' . $from);
			return;
		} else if ($this->is_otr($pl['body'])) {
			$this->log(LOG_INFO, 'Ignoring OTR from ' . $from);
			return;
		} else {
			$len = mb_strlen($pl['body']);
			if($len > 140) {
				$this->from_site($from, 'Message too long - maximum is 140 characters, you sent ' . $len);
				return;
			}
			$this->add_notice($user, $pl);
		}
		
		$user->free();
		unset($user);
	}

	function is_self($from) {
		return preg_match('/^'.strtolower(jabber_daemon_address()).'/', strtolower($from));
	}
	
	function get_ofrom($pl) {
		$xml = $pl['raw'];
		$addresses = $xml->sub('addresses');
		if (!$addresses) {
			$this->log(LOG_WARNING, 'Forwarded message without addresses');
			return NULL;
		}
		$address = $addresses->sub('address');
		if (!$address) {
			$this->log(LOG_WARNING, 'Forwarded message without address');
			return NULL;
		}
		if (!array_key_exists('type', $address->attrs)) {
			$this->log(LOG_WARNING, 'No type for forwarded message');
			return NULL;
		}
		$type = $address->attrs['type'];
		if ($type != 'ofrom') {
			$this->log(LOG_WARNING, 'Type of forwarded message is not ofrom');
			return NULL;
		}
		if (!array_key_exists('jid', $address->attrs)) {
			$this->log(LOG_WARNING, 'No jid for forwarded message');
			return NULL;
		}
		$jid = $address->attrs['jid'];
		if (!$jid) {
			$this->log(LOG_WARNING, 'Could not get jid from address');
			return NULL;
		}
		$this->log(LOG_DEBUG, 'Got message forwarded from jid ' . $jid);
		return $jid;
	}

	function is_autoreply($txt) {
		if (preg_match('/[\[\(]?[Aa]uto-?[Rr]eply[\]\)]/', $txt)) {
			return true;
		} else {
			return false;
		}
	}

	function is_otr($txt) {
		if (preg_match('/^\?OTR/', $txt)) {
			return true;
		} else {
			return false;
		}
	}

	function from_site($address, $msg) {
		$text = '['.common_config('site', 'name') . '] ' . $msg;
		jabber_send_message($address, $text);
	}

	function handle_command($user, $body) {
		# XXX: localise
		$p=explode(' ',$body);
		if(count($p)>2)
			return false;
		switch($p[0]) {
		 case 'help':
		 	if(count($p)!=1)
		 		return false;
		 	$this->from_site($user->jabber, "Commands:\n on     - turn on notifications\n off    - turn off notifications\n help   - show this help \n sub - subscribe to user\n unsub - unsubscribe from user");
		 	return true;
		 case 'on':
		 	if(count($p)!=1)
		 		return false;
			$this->set_notify($user, true);
			$this->from_site($user->jabber, 'notifications on');
			return true;
		 case 'off':
		 	if(count($p)!=1)
		 		return false;
			$this->set_notify($user, false);
			$this->from_site($user->jabber, 'notifications off');
			return true;
		 case 'sub':
		 	if(count($p)==1) {
		 		$this->from_site($user->jabber, 'Specify the name of the user to subscribe to');
		 		return true;
		 	}
		 	$result=subs_subscribe_user($user, $p[1]);
		 	if($result=='true')
		 		$this->from_site($user->jabber, 'Subscribed to ' . $p[1]);
		 	else
		 		$this->from_site($user->jabber, $result);
		 	return true;
		 case 'unsub':
		 	if(count($p)==1) {
		 		$this->from_site($user->jabber, 'Specify the name of the user to unsubscribe from');
		 		return true;
		 	}
		 	$result=subs_unsubscribe_user($user, $p[1]);
		 	if($result=='true')
		 		$this->from_site($user->jabber, 'Unsubscribed from ' . $p[1]);
		 	else
		 		$this->from_site($user->jabber, $result);
		 	return true;
		 default:
			return false;
		}
	}

	function set_notify(&$user, $notify) {
		$orig = clone($user);
		$user->jabbernotify = $notify;
		$result = $user->update($orig);
		if (!$result) {
			$last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
			$this->log(LOG_ERR,
					   'Could not set notify flag to ' . $notify .
					   ' for user ' . common_log_objstring($user) .
					   ': ' . $last_error->message);
		} else {
			$this->log(LOG_INFO,
					   'User ' . $user->nickname . ' set notify flag to ' . $notify);
		}
	}

	function add_notice(&$user, &$pl) {
		$notice = Notice::saveNew($user->id, trim(mb_substr($pl['body'], 0, 140)), 'xmpp');
		if (is_string($notice)) {
			$this->log(LOG_ERR, $notice);
			return;
		}
		common_broadcast_notice($notice);
		$this->log(LOG_INFO,
				   'Added notice ' . $notice->id . ' from user ' . $user->nickname);
		$notice->free();
		unset($notice);
	}

	function handle_presence(&$pl) {
		$from = jabber_normalize_jid($pl['from']);
		switch ($pl['type']) {
		 case 'subscribe':
			# We let anyone subscribe
			$this->subscribed($from);
			$this->log(LOG_INFO,
					   'Accepted subscription from ' . $from);
			break;
		 case 'subscribed':
		 case 'unsubscribed':
		 case 'unsubscribe':
			$this->log(LOG_INFO,
					   'Ignoring  "' . $pl['type'] . '" from ' . $from);
			break;
		 default:
			if (!$pl['type']) {
				$user = User::staticGet('jabber', $from);
				if (!$user) {
					$this->log(LOG_WARNING, 'Presence from unknown user ' . $from);
					return;
				}
				if ($user->updatefrompresence) {
					$this->log(LOG_INFO, 'Updating ' . $user->nickname .
							   ' status from presence.');
					$this->add_notice($user, $pl);
				}
				$user->free();
				unset($user);
			}
			break;
		}
	}

	function log($level, $msg) {
		common_log($level, 'XMPPDaemon('.$this->resource.'): '.$msg);
	}

	function subscribed($to) {
		jabber_special_presence('subscribed', $to);
	}
}

ini_set("max_execution_time", "0");
ini_set("max_input_time", "0");
set_time_limit(0);
mb_internal_encoding('UTF-8');

$resource = ($argc > 1) ? $argv[1] : (common_config('xmpp','resource') . '-listen');

$daemon = new XMPPDaemon($resource);

$daemon->runOnce();