gnu-social/maildaemon.php

#!/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', dirname(__FILE__));
define('LACONICA', true);

require_once(INSTALLDIR . '/lib/common.php');
require_once(INSTALLDIR . '/lib/mail.php');
require_once('Mail/mimeDecode.php');

# FIXME: we use both Mail_mimeDecode and mailparse
# Need to move everything to mailparse

class MailerDaemon {

	function __construct() {
	}

	function handle_message($fname='php://stdin') {
		list($from, $to, $msg) = $this->parse_message($fname);
		if (!$from || !$to || !$msg) {
			$this->error(NULL, _t('Could not parse message.'));
		}
		common_log(LOG_INFO, "Mail from $from to $to: " .substr($msg, 0, 20));
		$user = $this->user_from($from);
		if (!$user) {
			$this->error($from, _('Not a registered user.'));
			return false;
		}
		if (!$this->user_match_to($user, $to)) {
			$this->error($from, _('Sorry, that is not your incoming email address.'));
			return false;
		}
		if (!$user->emailpost) {
			$this->error($from, _('Sorry, no incoming email allowed.'));
			return false;
		}
		$response = $this->handle_command($user, $msg);
		if ($response) {
			$this->respond($from, $to, $response);
			return true;
		}
		$msg = $this->cleanup_msg($msg);
		$this->add_notice($user, $msg);
	}

	function error($from, $msg) {
		file_put_contents("php://stderr", $msg . "\n");
		exit(1);
	}

	function user_from($from_hdr) {
		$froms = mailparse_rfc822_parse_addresses($from_hdr);
		if (!$froms) {
			return NULL;
		}
		$from = $froms[0];
		$addr = common_canonical_email($from['address']);
		$user = User::staticGet('email', $addr);
		if (!$user) {
			$user = User::staticGet('smsemail', $addr);
		}
		return $user;
	}

	function user_match_to($user, $to_hdr) {
		$incoming = $user->incomingemail;
		$tos = mailparse_rfc822_parse_addresses($to_hdr);
		foreach ($tos as $to) {
			if (strcasecmp($incoming, $to['address']) == 0) {
				return true;
			}
		}
		return false;
	}

	function handle_command($user, $msg) {
		return false;
	}

	function respond($from, $to, $response) {

		$headers['From'] = $to;
		$headers['To'] = $from;
		$headers['Subject'] = "Command complete";

		return mail_send(array($from), $headers, $response);
	}

	function log($level, $msg) {
		common_log($level, 'MailDaemon: '.$msg);
	}

	function add_notice($user, $msg) {
		$notice = Notice::saveNew($user->id, $msg, 'mail');
		if (is_string($notice)) {
			$this->log(LOG_ERR, $notice);
			return;
		}
		common_broadcast_notice($notice);
		$this->log(LOG_INFO,
				   'Added notice ' . $notice->id . ' from user ' . $user->nickname);
	}

	function parse_message($fname) {
		$contents = file_get_contents($fname);
		$parsed = Mail_mimeDecode::decode(array('input' => $contents,
												'include_bodies' => true,
												'decode_headers' => true,
												'decode_bodies' => true));
		if (!$parsed) {
			return NULL;
		}

		$from = $parsed->headers['from'];

		$to = $parsed->headers['to'];

		$type = $parsed->ctype_primary . '/' . $parsed->ctype_secondary;

		if ($parsed->ctype_primary == 'multipart') {
			foreach ($parsed->parts as $part) {
				if ($part->ctype_primary == 'text' &&
					$part->ctype_secondary == 'plain') {
					$msg = $part->body;
					break;
				}
			}
		} else if ($type == 'text/plain') {
			$msg = $parsed->body;
		} else {
			$this->unsupported_type($type);
		}

		return array($from, $to, $msg);
	}

	function unsupported_type($type) {
		$this->error(NULL, "Unsupported message type: " . $type);
	}

	function cleanup_msg($msg) {
		$lines = explode("\n", $msg);

		$output = '';

		foreach ($lines as $line) {
			// skip quotes
			if (preg_match('/^\s*>.*$/', $line)) {
				continue;
			}
			// skip start of quote
			if (preg_match('/^\s*On.*wrote:\s*$/', $line)) {
				continue;
			}
			// probably interesting to someone, not us
			if (preg_match('/^\s*Sent via/', $line)) {
				continue;
			}
			// skip everything after a sig
			if (preg_match('/^\s*--+\s*$/', $line) ||
				preg_match('/^\s*__+\s*$/', $line))
			{
				break;
			}
			// skip everything after Outlook quote
			if (preg_match('/^\s*-+\s*Original Message\s*-+\s*$/', $line)) {
				break;
			}
			// skip everything after weird forward
			if (preg_match('/^\s*Begin\s+forward/', $line)) {
				break;
			}

			$output .= ' ' . $line;
		}

		preg_replace('/\s+/', ' ', $output);
		return trim($output);
	}
}

$md = new MailerDaemon();
$md->handle_message('php://stdin');