/**
* Write session handler.
*
* {@see http://php.net/manual/en/function.session-set-save-handler.php}
*
* NOTE: Do not write to output or throw any exceptions!
* Hopefully the next page is going to display nice error or it recovers...
*
* @param string $sid
* @param string $session_data
* @return bool success
*/
public function handler_write($sid, $session_data)
{
if ($this->failed) {
// Do not write anything back - we failed to start the session properly.
return false;
}
$sessdata = base64_encode($session_data);
// There might be some binary mess :-(
$hash = sha1($sessdata);
if ($hash === $this->lasthash) {
return true;
}
try {
if ($this->recordid) {
$this->database->set_field('sessions', 'sessdata', $sessdata, array('id' => $this->recordid));
} else {
// This happens in the first request when session record was just created in manager.
$this->database->set_field('sessions', 'sessdata', $sessdata, array('sid' => $sid));
}
} catch (\Exception $ex) {
// Do not rethrow exceptions here, this should not happen.
error_log('Unknown exception when writing database session data : ' . $sid . ' - ' . $ex->getMessage());
}
return true;
}
/**
* Save the discussion to the DB
*
* @param object $discussion
* @param upload_file $uploader
*/
public function save_discussion($discussion, upload_file $uploader)
{
$message = '';
$discussion->id = hsuforum_add_discussion($discussion, null, $message);
$file = $uploader->process_file_upload($discussion->firstpost);
if (!is_null($file)) {
$this->db->set_field('hsuforum_posts', 'attachment', 1, array('id' => $discussion->firstpost));
}
}
/**
* Does all the grunt work for updating a post
*
* @param object $course
* @param object $cm
* @param object $forum
* @param \context_module $context
* @param object $discussion
* @param object $post
* @param array $deletefiles
* @param array $options These override default post values, EG: set the post message with this
* @return json_response
*/
public function handle_update_post($course, $cm, $forum, $context, $discussion, $post, array $deletefiles = array(), array $options)
{
$this->require_can_edit_post($forum, $context, $discussion, $post);
$uploader = new upload_file(new attachments($forum, $context, $deletefiles), \mod_hsuforum_post_form::attachment_options($forum));
// Apply updates to the post.
foreach ($options as $name => $value) {
if (property_exists($post, $name)) {
$post->{$name} = $value;
}
}
$post->itemid = empty($options['itemid']) ? 0 : $options['itemid'];
$errors = $this->validate_post($course, $cm, $forum, $context, $discussion, $post, $uploader);
if (!empty($errors)) {
return $this->create_error_response($errors);
}
$this->save_post($discussion, $post, $uploader);
// If the user has access to all groups and they are changing the group, then update the post.
if (empty($post->parent) && has_capability('mod/hsuforum:movediscussions', $context)) {
$this->db->set_field('hsuforum_discussions', 'groupid', $options['groupid'], array('id' => $discussion->id));
}
$this->trigger_post_updated($context, $forum, $discussion, $post);
return new json_response((object) array('eventaction' => 'postupdated', 'discussionid' => (int) $discussion->id, 'postid' => (int) $post->id, 'livelog' => get_string('postwasupdated', 'hsuforum'), 'html' => $this->discussionservice->render_full_thread($discussion->id)));
}
/**
* Write session handler.
*
* {@see http://php.net/manual/en/function.session-set-save-handler.php}
*
* NOTE: Do not write to output or throw any exceptions!
* Hopefully the next page is going to display nice error or it recovers...
*
* @param string $sid
* @param string $session_data
* @return bool success
*/
public function handler_write($sid, $session_data)
{
global $USER;
// TODO: MDL-20625 we need to rollback all active transactions and log error if any open needed
if ($this->failed) {
// do not write anything back - we failed to start the session properly
return false;
}
$userid = 0;
if (!empty($USER->realuser)) {
$userid = $USER->realuser;
} else {
if (!empty($USER->id)) {
$userid = $USER->id;
}
}
if (isset($this->record->id)) {
$data = base64_encode($session_data);
// There might be some binary mess :-(
// Skip db update if nothing changed,
// do not update the timemodified each second.
$hash = sha1($data);
if ($this->lasthash === $hash and $this->record->userid == $userid and time() - $this->record->timemodified < 20 and $this->record->lastip == getremoteaddr()) {
// No need to update anything!
return true;
}
$this->record->sessdata = $data;
$this->record->userid = $userid;
$this->record->timemodified = time();
$this->record->lastip = getremoteaddr();
try {
$this->database->update_record_raw('sessions', $this->record);
$this->lasthash = $hash;
} catch (dml_exception $ex) {
if ($this->database->get_dbfamily() === 'mysql') {
try {
$this->database->set_field('sessions', 'state', 9, array('id' => $this->record->id));
} catch (Exception $ignored) {
}
error_log('Can not write database session - please verify max_allowed_packet is at least 4M!');
} else {
error_log('Can not write database session');
}
return false;
} catch (Exception $ex) {
error_log('Can not write database session');
return false;
}
} else {
// fresh new session
try {
$record = new stdClass();
$record->state = 0;
$record->sid = $sid;
$record->sessdata = base64_encode($session_data);
// there might be some binary mess :-(
$record->userid = $userid;
$record->timecreated = $record->timemodified = time();
$record->firstip = $record->lastip = getremoteaddr();
$record->id = $this->database->insert_record_raw('sessions', $record);
$this->record = $this->database->get_record('sessions', array('id' => $record->id));
$this->lasthash = sha1($record->sessdata);
$this->database->get_session_lock($this->record->id, SESSION_ACQUIRE_LOCK_TIMEOUT);
} catch (Exception $ex) {
// this should not happen
error_log('Can not write new database session or acquire session lock');
$this->failed = true;
return false;
}
}
return true;
}
