/**
* Copy of rcube_imap::search_index()
*/
protected function search_index()
{
$criteria = $this->search;
$charset = $this->charset;
$imap = $this->worker->get_imap();
if (!$imap->connected()) {
trigger_error("No IMAP connection for {$this->folder}", E_USER_WARNING);
if ($this->threading) {
return new rcube_result_thread($this->folder);
} else {
return new rcube_result_index($this->folder);
}
}
if ($this->worker->options['skip_deleted'] && !preg_match('/UNDELETED/', $criteria)) {
$criteria = 'UNDELETED ' . $criteria;
}
// unset CHARSET if criteria string is ASCII, this way
// SEARCH won't be re-sent after "unsupported charset" response
if ($charset && $charset != 'US-ASCII' && is_ascii($criteria)) {
$charset = 'US-ASCII';
}
if ($this->threading) {
$threads = $imap->thread($this->folder, $this->threading, $criteria, true, $charset);
// Error, try with US-ASCII (RFC5256: SORT/THREAD must support US-ASCII and UTF-8,
// but I've seen that Courier doesn't support UTF-8)
if ($threads->is_error() && $charset && $charset != 'US-ASCII') {
$threads = $imap->thread($this->folder, $this->threading, rcube_imap::convert_criteria($criteria, $charset), true, 'US-ASCII');
}
return $threads;
}
if ($this->sort_field) {
$messages = $imap->sort($this->folder, $this->sort_field, $criteria, true, $charset);
// Error, try with US-ASCII (RFC5256: SORT/THREAD must support US-ASCII and UTF-8,
// but I've seen Courier with disabled UTF-8 support)
if ($messages->is_error() && $charset && $charset != 'US-ASCII') {
$messages = $imap->sort($this->folder, $this->sort_field, rcube_imap::convert_criteria($criteria, $charset), true, 'US-ASCII');
}
}
if (!$messages || $messages->is_error()) {
$messages = $imap->search($this->folder, ($charset && $charset != 'US-ASCII' ? "CHARSET {$charset} " : '') . $criteria, true);
// Error, try with US-ASCII (some servers may support only US-ASCII)
if ($messages->is_error() && $charset && $charset != 'US-ASCII') {
$messages = $imap->search($this->folder, rcube_imap::convert_criteria($criteria, $charset), true);
}
}
return $messages;
}
