/**
* Initialise download of all solutions in all task sets belonging to this course.
*/
public function download_all_solutions()
{
if (!is_null($this->id)) {
$task_sets = new Task_set();
$task_sets->where_related('course', $this);
$task_sets->get_iterated();
$filename = $this->get_new_solution_zip_filename();
$zip_archive = new ZipArchive();
if ($zip_archive->open($filename, ZipArchive::CREATE)) {
$period = $this->period->get();
$readme = $this->lang->text($this->name);
$readme .= "\r\n" . $this->lang->text($period->name);
$zip_archive->addFromString('readme.txt', $readme);
foreach ($task_sets as $task_set) {
$overlay_name = $this->lang->get_overlay('task_sets', $task_set->id, 'name');
$task_set->add_files_to_zip_archive($zip_archive, $this, normalizeForFilesystem(trim($overlay_name) == '' ? $task_set->name : $overlay_name) . '_(' . $task_set->id . ')');
}
$zip_archive->close();
header('Content-Description: File Transfer');
header('Content-Type: application/zip');
header('Content-Disposition: attachment; filename=' . basename($filename));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($filename));
ob_clean();
flush();
$f = fopen($filename, 'r');
while (!feof($f)) {
echo fread($f, 1024);
}
fclose($f);
unlink($filename);
} else {
header("HTTP/1.0 404 Not Found");
}
} else {
header("HTTP/1.0 404 Not Found");
}
die;
}
/**
* Add files to open zip archive.
* @param ZipArchive $zip_archive open zip archive.
* @param Course $course course object with loaded course.
* @param string|NULL $subdirectory subdirectory where to add files.
*/
public function add_files_to_zip_archive(ZipArchive $zip_archive, Course $course, $subdirectory = NULL)
{
if (!is_null($this->id)) {
ini_set('max_execution_time', 300);
$path_to_task_set_files = 'private/uploads/solutions/task_set_' . $this->id . '/';
if (file_exists($path_to_task_set_files)) {
$groups = $course->groups->get_iterated();
$group_names = array(0 => 'unassigned');
foreach ($groups as $group) {
$group_names[$group->id] = normalizeForFilesystem($this->lang->text($group->name));
}
$students = new Student();
$students->include_related('participant');
$students->where_related('participant/course', $course);
$students->get_iterated();
$student_groups = array();
foreach ($students as $studnet) {
$student_groups[$studnet->id] = intval($studnet->participant_group_id);
}
$files = scandir($path_to_task_set_files);
foreach ($files as $file) {
if ($file != '.' && $file != '..') {
if (preg_match(self::STUDENT_FILE_NAME_REGEXP, $file, $matches)) {
$student_id = intval($matches['student_id']);
$path = ($subdirectory !== NULL && trim($subdirectory) != '' ? $subdirectory . '/' : '') . $group_names[$student_groups[$student_id]] . '/' . $file;
$zip_archive->addFile($path_to_task_set_files . $file, $path);
}
}
}
}
}
}