/**
* First we check the references and in-reply-to headers to find a
* historical match in the database. If those don't match we check
* the subject line for a mask (if one exists). If none of those
* options match we return null.
*
* @param array $headers
* @return array
*/
private static function findParentMessage($headers)
{
@($aSubject = $headers['subject']);
@($sMessageId = trim($headers['message-id']));
@($sInReplyTo = trim($headers['in-reply-to']));
@($sReferences = trim($headers['references']));
@($sThreadTopic = trim($headers['thread-topic']));
// [TODO] Could turn string comparisons into hashes here for simple equality checks
$aReferences = array();
// Add all References
if (!empty($sReferences)) {
if (preg_match("/(\\<.*?\\@.*?\\>)/", $sReferences, $matches)) {
unset($matches[0]);
// who cares about the pattern
foreach ($matches as $ref) {
$ref = trim($ref);
if (!empty($ref) && 0 != strcasecmp($ref, $sMessageId)) {
$aReferences[$ref] = 1;
}
}
}
}
unset($matches);
// Append first <*> from In-Reply-To
if (!empty($sInReplyTo)) {
if (preg_match("/(\\<.*?\\@.*?\\>)/", $sInReplyTo, $matches)) {
if (isset($matches[1])) {
// only use the first In-Reply-To
$ref = trim($matches[1]);
if (!empty($ref) && 0 != strcasecmp($ref, $sMessageId)) {
$aReferences[$ref] = 1;
}
}
}
}
// Try matching our references or in-reply-to
if (is_array($aReferences) && !empty($aReferences)) {
foreach (array_keys($aReferences) as $ref) {
if (empty($ref)) {
continue;
}
if (null != ($ids = DAO_Ticket::getTicketByMessageId($ref))) {
return $ids;
}
}
}
// Try matching the subject line
// [TODO] This should only happen if the destination has subject masks enabled
if (!is_array($aSubject)) {
$aSubject = array($aSubject);
}
foreach ($aSubject as $sSubject) {
if (preg_match("/.*\\[.*?\\#(.*?)\\].*/", $sSubject, $matches)) {
if (isset($matches[1])) {
$mask = $matches[1];
if (null != ($ticket = DAO_Ticket::getTicketByMask($mask))) {
return array('ticket_id' => intval($ticket->id), 'message_id' => intval($ticket->first_message_id));
}
}
}
}
return NULL;
}