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calendar_itip.php
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calendar_itip.php
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<?php
/**
* iTIP functions for the Calendar plugin
*
* Class providing functionality to manage iTIP invitations
*
* @version @package_version@
* @author Thomas Bruederli <bruederli@kolabsys.com>
* @package @package_name@
*
* Copyright (C) 2011, Kolab Systems AG <contact@kolabsys.com>
*
* 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/>.
*/
class calendar_itip
{
private $rc;
private $cal;
private $sender;
private $itip_send = false;
function __construct($cal, $identity = null)
{
$this->cal = $cal;
$this->rc = $cal->rc;
$this->sender = $identity ? $identity : $this->rc->user->get_identity();
$this->cal->add_hook('message_before_send', array($this, 'before_send_hook'));
$this->cal->add_hook('smtp_connect', array($this, 'smtp_connect_hook'));
}
function set_sender_email($email)
{
if (!empty($email))
$this->sender['email'] = $email;
}
/**
* Send an iTip mail message
*
* @param array Event object to send
* @param string iTip method (REQUEST|REPLY|CANCEL)
* @param array Hash array with recipient data (name, email)
* @param string Mail subject
* @param string Mail body text label
* @param object Mail_mime object with message data
* @return boolean True on success, false on failure
*/
public function send_itip_message($event, $method, $recipient, $subject, $bodytext, $message = null)
{
if (!$this->sender['name'])
$this->sender['name'] = $this->sender['email'];
if (!$message)
$message = $this->compose_itip_message($event, $method);
$mailto = rcube_idn_to_ascii($recipient['email']);
$headers = $message->headers();
$headers['To'] = format_email_recipient($mailto, $recipient['name']);
$headers['Subject'] = $this->cal->gettext(array(
'name' => $subject,
'vars' => array('title' => $event['title'], 'name' => $this->sender['name'])
));
// compose a list of all event attendees
$attendees_list = array();
foreach ((array)$event['attendees'] as $attendee) {
$attendees_list[] = ($attendee['name'] && $attendee['email']) ?
$attendee['name'] . ' <' . $attendee['email'] . '>' :
($attendee['name'] ? $attendee['name'] : $attendee['email']);
}
$mailbody = $this->cal->gettext(array(
'name' => $bodytext,
'vars' => array(
'title' => $event['title'],
'date' => $this->cal->lib->event_date_text($event, true),
'attendees' => join(', ', $attendees_list),
'sender' => $this->sender['name'],
'organizer' => $this->sender['name'],
)
));
// append links for direct invitation replies
if ($method == 'REQUEST' && ($token = $this->store_invitation($event, $recipient['email']))) {
$mailbody .= "\n\n" . $this->cal->gettext(array(
'name' => 'invitationattendlinks',
'vars' => array('url' => $this->cal->get_url(array('action' => 'attend', 't' => $token))),
));
}
else if ($method == 'CANCEL') {
$this->cancel_itip_invitation($event);
}
$message->headers($headers, true);
$message->setTXTBody(rcube_mime::format_flowed($mailbody, 79));
// finally send the message
$this->itip_send = true;
$sent = $this->rc->deliver_message($message, $headers['X-Sender'], $mailto, $smtp_error);
$this->itip_send = false;
return $sent;
}
/**
* Plugin hook triggered by rcube::deliver_message() before delivering a message.
* Here we can set the 'smtp_server' config option to '' in order to use
* PHP's mail() function for unauthenticated email sending.
*/
public function before_send_hook($p)
{
if ($this->itip_send && !$this->rc->user->ID && $this->rc->config->get('calendar_itip_smtp_server', null) === '') {
$this->rc->config->set('smtp_server', '');
}
return $p;
}
/**
* Plugin hook to alter SMTP authentication.
* This is used if iTip messages are to be sent from an unauthenticated session
*/
public function smtp_connect_hook($p)
{
// replace smtp auth settings if we're not in an authenticated session
if ($this->itip_send && !$this->rc->user->ID) {
foreach (array('smtp_server', 'smtp_user', 'smtp_pass') as $prop) {
$p[$prop] = $this->rc->config->get("calendar_itip_$prop", $p[$prop]);
}
}
return $p;
}
/**
* Helper function to build a Mail_mime object to send an iTip message
*
* @param array Event object to send
* @param string iTip method (REQUEST|REPLY|CANCEL)
* @return object Mail_mime object with message data
*/
public function compose_itip_message($event, $method)
{
$from = rcube_idn_to_ascii($this->sender['email']);
$from_utf = rcube_idn_to_utf8($from);
$sender = format_email_recipient($from, $this->sender['name']);
// truncate list attendees down to the recipient of the iTip Reply.
// constraints for a METHOD:REPLY according to RFC 5546
if ($method == 'REPLY') {
$replying_attendee = null; $reply_attendees = array();
foreach ($event['attendees'] as $attendee) {
if ($attendee['role'] == 'ORGANIZER') {
$reply_attendees[] = $attendee;
}
else if (strcasecmp($attedee['email'], $from) == 0 || strcasecmp($attendee['email'], $from_utf) == 0) {
$replying_attendee = $attendee;
}
}
if ($replying_attendee) {
$reply_attendees[] = $replying_attendee;
$event['attendees'] = $reply_attendees;
}
}
// compose multipart message using PEAR:Mail_Mime
$message = new Mail_mime("\r\n");
$message->setParam('text_encoding', 'quoted-printable');
$message->setParam('head_encoding', 'quoted-printable');
$message->setParam('head_charset', RCMAIL_CHARSET);
$message->setParam('text_charset', RCMAIL_CHARSET . ";\r\n format=flowed");
$message->setContentType('multipart/alternative');
// compose common headers array
$headers = array(
'From' => $sender,
'Date' => $this->rc->user_date(),
'Message-ID' => $this->rc->gen_message_id(),
'X-Sender' => $from,
);
if ($agent = $this->rc->config->get('useragent'))
$headers['User-Agent'] = $agent;
$message->headers($headers);
// attach ics file for this event
$ical = $this->cal->get_ical();
$ics = $ical->export(array($event), $method, false, $method == 'REQUEST' ? array($this->cal->driver, 'get_attachment_body') : false);
$message->addAttachment($ics, 'text/calendar', 'event.ics', false, '8bit', '', RCMAIL_CHARSET . "; method=" . $method);
return $message;
}
/**
* Find invitation record by token
*
* @param string Invitation token
* @return mixed Invitation record as hash array or False if not found
*/
public function get_invitation($token)
{
if ($parts = $this->decode_token($token)) {
$result = $this->rc->db->query("SELECT * FROM itipinvitations WHERE token=?", $parts['base']);
if ($result && ($rec = $this->rc->db->fetch_assoc($result))) {
$rec['event'] = unserialize($rec['event']);
$rec['attendee'] = $parts['attendee'];
return $rec;
}
}
return false;
}
/**
* Update the attendee status of the given invitation record
*
* @param array Invitation record as fetched with calendar_itip::get_invitation()
* @param string Attendee email address
* @param string New attendee status
*/
public function update_invitation($invitation, $email, $newstatus)
{
if (is_string($invitation))
$invitation = $this->get_invitation($invitation);
if ($invitation['token'] && $invitation['event']) {
// update attendee record in event data
foreach ($invitation['event']['attendees'] as $i => $attendee) {
if ($attendee['role'] == 'ORGANIZER') {
$organizer = $attendee;
}
else if ($attendee['email'] == $email) {
// nothing to be done here
if ($attendee['status'] == $newstatus)
return true;
$invitation['event']['attendees'][$i]['status'] = $newstatus;
$this->sender = $attendee;
}
}
$invitation['event']['changed'] = new DateTime();
// send iTIP REPLY message to organizer
if ($organizer) {
$status = strtolower($newstatus);
if ($this->send_itip_message($invitation['event'], 'REPLY', $organizer, 'itipsubject' . $status, 'itipmailbody' . $status))
$this->rc->output->command('display_message', $this->cal->gettext(array('name' => 'sentresponseto', 'vars' => array('mailto' => $organizer['name'] ? $organizer['name'] : $organizer['email']))), 'confirmation');
else
$this->rc->output->command('display_message', $this->cal->gettext('itipresponseerror'), 'error');
}
// update record in DB
$query = $this->rc->db->query(
"UPDATE itipinvitations
SET event=?
WHERE token=?",
self::serialize_event($invitation['event']),
$invitation['token']
);
if ($this->rc->db->affected_rows($query))
return true;
}
return false;
}
/**
* Create iTIP invitation token for later replies via URL
*
* @param array Hash array with event properties
* @param string Attendee email address
* @return string Invitation token
*/
public function store_invitation($event, $attendee)
{
static $stored = array();
if (!$event['uid'] || !$attendee)
return false;
// generate token for this invitation
$token = $this->generate_token($event, $attendee);
$base = substr($token, 0, 40);
// already stored this
if ($stored[$base])
return $token;
// delete old entry
$this->rc->db->query("DELETE FROM itipinvitations WHERE token=?", $base);
$query = $this->rc->db->query(
"INSERT INTO itipinvitations
(token, event_uid, user_id, event, expires)
VALUES(?, ?, ?, ?, ?)",
$base,
$event['uid'],
$this->rc->user->ID,
self::serialize_event($event),
date('Y-m-d H:i:s', $event['end'] + 86400 * 2)
);
if ($this->rc->db->affected_rows($query)) {
$stored[$base] = 1;
return $token;
}
return false;
}
/**
* Mark invitations for the given event as cancelled
*
* @param array Hash array with event properties
*/
public function cancel_itip_invitation($event)
{
// flag invitation record as cancelled
$this->rc->db->query(
"UPDATE itipinvitations
SET cancelled=1
WHERE event_uid=? AND user_id=?",
$event['uid'],
$this->rc->user->ID
);
}
/**
* Generate an invitation request token for the given event and attendee
*
* @param array Event hash array
* @param string Attendee email address
*/
public function generate_token($event, $attendee)
{
$base = sha1($event['uid'] . ';' . $this->rc->user->ID);
$mail = base64_encode($attendee);
$hash = substr(md5($base . $mail . $this->rc->config->get('des_key')), 0, 6);
return "$base.$mail.$hash";
}
/**
* Decode the given iTIP request token and return its parts
*
* @param string Request token to decode
* @return mixed Hash array with parts or False if invalid
*/
public function decode_token($token)
{
list($base, $mail, $hash) = explode('.', $token);
// validate and return parts
if ($mail && $hash && $hash == substr(md5($base . $mail . $this->rc->config->get('des_key')), 0, 6)) {
return array('base' => $base, 'attendee' => base64_decode($mail));
}
return false;
}
/**
* Helper method to serialize the given event for storing in invitations table
*/
private static function serialize_event($event)
{
$ev = $event;
$ev['description'] = abbreviate_string($ev['description'], 100);
unset($ev['attachments']);
return serialize($ev);
}
}

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