/**
* Called via pluginfile.php -> question_pluginfile to serve files belonging to
* a question in a question_attempt when that attempt is a preview.
*
* @param object $course course settings object
* @param object $context context object
* @param string $component the name of the component we are serving files for.
* @param string $filearea the name of the file area.
* @param array $args the remaining bits of the file path.
* @param bool $forcedownload whether the user must be forced to download the file.
* @return bool false if file not found, does not return if found - justsend the file
*/
function question_preview_question_pluginfile($course, $context, $component, $filearea, $attemptid, $questionid, $args, $forcedownload)
{
global $USER, $SESSION, $DB, $CFG;
require_once $CFG->dirroot . '/mod/quiz/locallib.php';
if (!($question = $DB->get_record('question', array('id' => $questionid)))) {
return send_file_not_found();
}
if (!question_has_capability_on($question, 'use', $question->category)) {
send_file_not_found();
}
if (!isset($SESSION->quizpreview->states) || $SESSION->quizpreview->questionid != $questionid) {
send_file_not_found();
}
$states = end($SESSION->quizpreview->states);
if (!array_key_exists($question->id, $states)) {
send_file_not_found();
}
$state = $states[$question->id];
// Build fake cmoptions
$quiz = new cmoptions();
$quiz->id = 0;
$quiz->review = get_config('quiz', 'review');
if (empty($course->id)) {
$quiz->course = SITEID;
} else {
$quiz->course = $course->id;
}
$quiz->decimalpoints = get_config('quiz', 'decimalpoints');
$questions[$question->id] = $question;
get_question_options($questions);
// Build fake attempt
$timenow = time();
$attempt = new stdClass();
$attempt->quiz = $quiz->id;
$attempt->userid = $USER->id;
$attempt->attempt = 0;
$attempt->sumgrades = 0;
$attempt->timestart = $timenow;
$attempt->timefinish = 0;
$attempt->timemodified = $timenow;
$attempt->uniqueid = 0;
$attempt->id = 0;
$attempt->layout = $question->id;
$options = quiz_get_renderoptions($quiz, $attempt, $context, $state);
$options->noeditlink = true;
// XXX: mulitichoice type needs quiz id to get maxgrade
$options->quizid = 0;
if (!question_check_file_access($question, $state, $options, $context->id, $component, $filearea, $args, $forcedownload)) {
send_file_not_found();
}
$fs = get_file_storage();
$relativepath = implode('/', $args);
$fullpath = "/{$context->id}/{$component}/{$filearea}/{$relativepath}";
if (!($file = $fs->get_file_by_hash(sha1($fullpath))) or $file->is_directory()) {
send_file_not_found();
}
send_stored_file($file, 0, 0, $forcedownload);
}
public function check_file_access($questionid, $isreviewing, $contextid, $component, $filearea, $args, $forcedownload)
{
if ($isreviewing) {
$options = $this->get_review_options();
} else {
$options = $this->get_render_options($questionid);
}
// XXX: mulitichoice type needs quiz id to get maxgrade
$options->quizid = $this->attempt->quiz;
return question_check_file_access($this->questions[$questionid], $this->get_question_state($questionid), $options, $contextid, $component, $filearea, $args, $forcedownload);
}
