forked from extern/egroupware
417 lines
12 KiB
PHP
417 lines
12 KiB
PHP
<?php
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/**
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* EGroupware: iSchedule client
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage groupdav
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2012-13 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* iSchedule client: clientside of iSchedule
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*
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* @link https://tools.ietf.org/html/draft-desruisseaux-ischedule-03 iSchedule draft from 2013-01-22
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*/
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class ischedule_client
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{
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/**
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* Own iSchedule version
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*/
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const VERSION = '1.0';
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/**
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* Required headers in DKIM signature (DKIM-Signature is always a required header!)
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*/
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const REQUIRED_DKIM_HEADERS = 'Host:iSchedule-Version:iSchedule-Message-ID:Content-Type:Originator:Recipient';
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/**
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* URL to use to contact iSchedule receiver
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*
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* @var string
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*/
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private $url;
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/**
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* Recipient email addresses
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*
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* @param array
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*/
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private $recipients;
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/**
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* Originator email address
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*
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* @var string
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*/
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private $originator;
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/**
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* Private key of originators domain
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*
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* @var string
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*/
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private $dkim_private_key;
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/**
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* Constructor
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*
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* @param string|array $recipients=null recipient email-address(es)
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* @param string $url=null ischedule url, if it should NOT be discovered
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* @throws Exception in case of an error or discovery failure
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*/
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public function __construct($recipients, $url=null)
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{
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$this->recipients = (array)$recipients;
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$this->originator = $GLOBALS['egw_info']['user']['account_email'];
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if (is_null($url))
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{
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list(,$domain) = explode('@', $this->recipients[0]);
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$this->url = self::discover($domain);
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}
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else
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{
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$this->url = $url;
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}
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$this->dkim_private_key = $GLOBALS['egw_info']['server']['dkim_private_key'];
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}
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/**
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* Generate private/public key pair
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*
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* Private and public key are stored in api config as dkim_private_key / dkim_public_key and loaded automatic by constructor.
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*
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* @return string public key
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*/
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public static function generateKeyPair()
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{
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// Create the keypair
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$res = openssl_pkey_new();
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// Get private key
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openssl_pkey_export($res, $dkim_private_key);
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// Get public key
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$details = openssl_pkey_get_details($res);
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$dkim_public_key = $details['key'];
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// store both in config
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config::save_value('dkim_private_key', $dkim_private_key, 'phpgwapi');
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config::save_value('dkim_public_key', $dkim_public_key, 'phpgwapi');
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return $dkim_public_key;
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}
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const EMAIL_PREG = '/^([a-z0-9][a-z0-9._-]*)?[a-z0-9]@([a-z0-9](|[a-z0-9_-]*[a-z0-9])\.)+[a-z]{2,6}$/i';
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/**
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* Set originator and (optional) DKIM private key
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*
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* @param string $originator
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* @param string $dkim_private_key=null
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* @throws Exception for invalid / not an email originator
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*/
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public function setOriginator($originator, $dkim_private_key=null)
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{
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if (!preg_match(self::EMAIL_PREG, $originator))
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{
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throw new Exception("Invalid orginator '$originator'!");
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}
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$this->originator = $originator;
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if (!is_null($dkim_private_key))
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{
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$this->dkim_private_key = $dkim_private_key;
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}
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}
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/**
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* Discover iSchedule url of a given domain
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*
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* @param string $domain
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* @return string discovered ischedule url
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* @throws Exception in case of an error or discovery failure
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*/
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public static function discover($domain)
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{
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static $scheme2port = array(
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'https' => 443,
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'http' => 80,
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);
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$d = $domain;
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for($n = 0; $n < 3; ++$n)
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{
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if (!($records = dns_get_record($host='_ischedules._tcp.'.$d, DNS_SRV)) &&
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!($records = dns_get_record($host='_ischedule._tcp.'.$d, DNS_SRV)))
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{
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// try without subdomain(s)
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$parts = explode('.', $d);
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if (count($parts) < 3) break;
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array_shift($parts);
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$d = implode('.', $parts);
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}
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}
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if (!$records) throw new Exception("Could not discover iSchedule service for domain '$domain'!");
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// ToDo: do we need to use priority and weight
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$record = $records[0];
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$url = strpos($host, '_ischedules') === 0 ? 'https' : 'http';
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if ($scheme2port[$url] == $record['port'])
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{
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$url .= '://'.$record['target'];
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}
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else
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{
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$url .= '://'.$record['target'].':'.$record['port'];
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}
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$url .= '/.well-known/ischedule';
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return $url;
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}
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/**
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* Post dkim signed message to recipients iSchedule server
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*
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* @param string $content
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* @param string $content_type
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* @param boolean $debug=false true echo request before posting
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* @param int $max_redirect=3 maximum number of redirect before failing
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* @return string
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* @throws Exception with http status code and message, if server responds other then 2xx
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*/
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public function post_msg($content, $content_type, $debug=false, $max_redirect=3)
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{
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if (empty($this->dkim_private_key))
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{
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throw new Exception('You need to generate a key pair first!');
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}
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$url_parts = parse_url($this->url);
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$headers = array(
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'Host' => $url_parts['host'].($url_parts['port'] ? ':'.$url_parts['port'] : ''),
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'iSchedule-Version' => self::VERSION,
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'iSchedule-Message-ID' => uniqid(),
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'Content-Type' => $content_type,
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'Originator' => $this->originator,
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'Recipient' => $this->recipients,
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'Cache-Control' => 'no-cache, no-transform', // required by iSchedule spec
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'Content-Length' => bytes($content),
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);
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$header_string = '';
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foreach($headers as $name => $value)
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{
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foreach((array)$value as $val)
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{
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$header_string .= $name.': '.$val."\r\n";
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}
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}
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$header_string .= $this->dkim_sign($headers, $content)."\r\n";
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$opts = array('http' =>
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array(
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'method' => 'POST',
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'header' => $header_string,
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'user_agent' => 'EGroupware iSchedule client '.$GLOBALS['egw_info']['server']['versions']['phpgwapi'].' $Id$',
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//'follow_location' => 1, // default 1=follow, but only for GET, not POST!
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//'timeout' => $timeout, // max timeout in seconds (float)
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'content' => $content,
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)
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);
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if ($debug) echo "POST $this->url HTTP/1.1\n$header_string\n$content\n";
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// need to suppress warning, if http-status not 2xx
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if (($response = @file_get_contents($this->url, false, stream_context_create($opts))) === false)
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{
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list(, $code, $message) = explode(' ', $http_response_header[0], 3);
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if ($max_redirect && $code[0] === '3')
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{
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foreach($http_response_header as $header)
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{
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if (stripos($header, 'location:') === 0)
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{
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list(,$location) = preg_split('/: ?/', $header, 2);
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if ($location[0] == '/')
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{
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$parts = parse_url($this->url);
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$location = $parts['scheme'].'://'.$parts['host'].($parts['port'] ? ':'.$parts['port'] : '').$location;
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}
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$this->url = $location;
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// follow redirect
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return $this->post_msg($content, $content_type, $debug, $max_redirect-1);
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}
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}
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}
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throw new Exception($message, $code);
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}
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return $response;
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}
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/**
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* Calculate DKIM signature for headers and body using originators domains private key
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*
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* @param array $headers name => value pairs, names as in $sign_headers
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* @param string $body
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* @param string $selector='calendar'
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* @param string $sign_headers='iSchedule-Version:Content-Type:Originator:Recipient'
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* @return string DKIM-Signature: ...
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*/
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public function dkim_sign(array $headers, $body, $selector='calendar',$sign_headers=self::REQUIRED_DKIM_HEADERS)
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{
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$header_values = $header_names = array();
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foreach(explode(':', $sign_headers) as $header)
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{
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foreach((array)$headers[$header] as $value)
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{
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$header_values[] = $header.': '.$value;
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$header_names[] = $header;
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}
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// oversign multiple value header Recipient
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if ($header == 'Recipient')
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{
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$header_names[] = $header;
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}
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}
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error_log(__METHOD__."(".array2string($headers).", \$body, '$selector', '$sign_headers') header_names=".array2string($header_names).', header_values='.array2string($header_values));
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include_once EGW_API_INC.'/php-mail-domain-signer/lib/class.mailDomainSigner.php';
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list(,$domain) = explode('@', $this->originator);
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$mds = new mailDomainSigner($this->dkim_private_key, $domain, $selector);
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// generate DKIM signature according to iSchedule spec
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$dkim = $mds->getDKIM(implode(':', $header_names), $header_values, $body, 'relaxed/simple', 'rsa-sha256',
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"DKIM-Signature: ".
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"v=1; ". // DKIM Version
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"a=\$a; ". // The algorithm used to generate the signature "rsa-sha1"
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"q=dns/txt:http/well-known; ". // how to fetch public key: dns/txt, http/well-known or private-exchange
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"x=300; ". // how long request will be valid in sec
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// end iSchedule specific
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"s=\$s; ". // The selector subdividing the namespace for the "d=" (domain) tag
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"d=\$d; ". // The domain of the signing entity
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"l=\$l; ". // Canonicalizated Body length count
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"t=\$t; ". // Signature Timestamp
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"c=\$c; ". // Message (Headers/Body) Canonicalization "relaxed/relaxed"
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"h=\$h; ". // Signed header fields
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"bh=\$bh;\r\n\t". // The hash of the canonicalized body part of the message
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"b="); // The signature data (Empty because we will calculate it later));
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// as we do http, no need to fold dkim, in fact recommendation is not to
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$dkim = str_replace(array(";\r\n\t", "\r\n\t"), array('; ', ''), $dkim);
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return $dkim;
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}
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/**
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* Capabilities
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*
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* @var array
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*/
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private $capabilities;
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/**
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* Query capabilities of iSchedule server
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*
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* @param string $name=null name of capability to return, default null to return internal array with all capabilities
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* @return mixed
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* @throws Exception in case of an error or discovery failure
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*/
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public function capabilities($name=null)
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{
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if (!isset($this->capabilities))
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{
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$reader = new XMLReader();
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if (!$reader->open($this->url.'?action=capabilities'))
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{
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throw new Exception("Could not read iSchedule server capabilities $this->url!");
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}
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$this->capabilities = self::xml2assoc($reader);
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$reader->close();
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if (!isset($this->capabilities['query-result']) || !isset($this->capabilities['query-result']['capability-set']))
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{
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throw new Exception("Server returned invalid capabilities!");
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}
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$this->capabilities = $this->capabilities['query-result']['capability-set'];
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print_r($this->capabilities);
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}
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return $name ? $this->capabilities[$name] : $this->capabilities;
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}
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/**
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* Parse capabilities xml into an associativ array
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*
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* @param XMLReader $xml
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* @param &$target=array()
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* @return mixed
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*/
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private static function xml2assoc(XMLReader $xml, &$target = array())
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{
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while ($xml->read())
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{
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switch ($xml->nodeType) {
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case XMLReader::END_ELEMENT:
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return $target;
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case XMLReader::ELEMENT:
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$name = $xml->name;
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$empty = $xml->isEmptyElement;
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$attr_name = $xml->getAttribute('name');
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if (($name_attr = $xml->getAttribute('name')))
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{
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$name = $attr_name;
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}
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if (isset($target[$name]))
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{
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if (!is_array($target[$name]))
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{
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$target[$name] = array($target[$name]);
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}
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$t = &$target[$name][count($target[$name])];
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}
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else
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{
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$t = &$target[$name];
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}
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if ($xml->isEmptyElement)
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{
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$t = '';
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}
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else
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{
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self::xml2assoc($xml, $t);
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}
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if ($xml->hasAttributes)
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{
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while($xml->moveToNextAttribute())
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{
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if ($xml->name != 'name')
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{
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$t['@'.$xml->name] = $xml->value;
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}
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}
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}
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break;
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case XMLReader::TEXT:
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case XMLReader::CDATA:
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$target = $xml->value;
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}
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}
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return $target;
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}
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/**
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* Make private vars readable
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*
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* @param string $name
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* @return mixed
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*/
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public function __get($name)
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{
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return $this->$name;
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}
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}
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