/**
* Displays detail description of given problem
*
* @param int $assignment_id
* @param int $problem_id
*/
public function index($assignment_id = NULL, $problem_id = 1)
{
// If no assignment is given, use selected assignment
if ($assignment_id === NULL) {
$assignment_id = $this->user->selected_assignment['id'];
}
if ($assignment_id == 0) {
show_error('No assignment selected.');
}
$assignment = $this->assignment_model->assignment_info($assignment_id);
$data = array('all_assignments' => $this->all_assignments, 'all_problems' => $this->assignment_model->all_problems($assignment_id), 'description_assignment' => $assignment, 'can_submit' => TRUE);
if (!is_numeric($problem_id) || $problem_id < 1 || $problem_id > $data['description_assignment']['problems']) {
show_404();
}
$languages = explode(',', $data['all_problems'][$problem_id]['allowed_languages']);
$assignments_root = rtrim($this->settings_model->get_setting('assignments_root'), '/');
$problem_dir = "{$assignments_root}/assignment_{$assignment_id}/p{$problem_id}";
$data['problem'] = array('id' => $problem_id, 'description' => '<p>Description not found</p>', 'allowed_languages' => $languages, 'has_pdf' => glob("{$problem_dir}/*.pdf") != FALSE);
$path = "{$problem_dir}/desc.html";
if (file_exists($path)) {
$data['problem']['description'] = file_get_contents($path);
}
if ($assignment['id'] == 0 or $this->user->level == 0 && !$assignment['open'] or shj_now() < strtotime($assignment['start_time']) or shj_now() > strtotime($assignment['finish_time']) + $assignment['extra_time'] or !$this->assignment_model->is_participant($assignment['participants'], $this->user->username)) {
$data['can_submit'] = FALSE;
}
$this->twig->display('pages/problems.twig', $data);
}
/**
* Returns server time (uses time zone in settings table)
*/
function shj_now_str()
{
if (!defined('SHJ_NOW_STR')) {
define('SHJ_NOW_STR', date("Y-m-d H:i:s", shj_now()));
}
return SHJ_NOW_STR;
}
/**
* Compressing and downloading final codes of an assignment to the browser
*/
public function download_submissions($type = FALSE, $assignment_id = FALSE)
{
if ($type !== 'by_user' && $type !== 'by_problem') {
show_404();
}
if ($assignment_id === FALSE || !is_numeric($assignment_id)) {
show_404();
}
if ($this->user->level == 0) {
// permission denied
show_404();
}
$this->load->model('submit_model');
$items = $this->submit_model->get_final_submissions($assignment_id, $this->user->level, $this->user->username);
$this->load->library('zip');
$assignments_root = rtrim($this->settings_model->get_setting('assignments_root'), '/');
foreach ($items as $item) {
$file_path = $assignments_root . "/assignment_{$item['assignment']}/p{$item['problem']}/{$item['username']}/{$item['file_name']}." . filetype_to_extension($item['file_type']);
if (!file_exists($file_path)) {
continue;
}
$file = file_get_contents($file_path);
if ($type === 'by_user') {
$this->zip->add_data("{$item['username']}/p{$item['problem']}." . filetype_to_extension($item['file_type']), $file);
} elseif ($type === 'by_problem') {
$this->zip->add_data("problem_{$item['problem']}/{$item['username']}." . filetype_to_extension($item['file_type']), $file);
}
}
$this->zip->download("assignment{$assignment_id}_submissions_{$type}_" . date('Y-m-d_H-i', shj_now()) . '.zip');
}
public function mcqproblems($assignment_id = NULL)
{
// If no assignment is given, use selected assignment
if ($assignment_id === NULL) {
$assignment_id = $this->user->selected_assignment['id'];
}
if ($assignment_id == 0) {
show_error('No assignment selected.');
}
$assignment = $this->assignment_model->assignment_time($assignment_id);
//if assignment not started the donot show any data of the assignment
if ($this->user->level == 0 && shj_now() < strtotime($assignment['start_time'])) {
$this->twig->display('pages/notstarted.twig', array('all_assignments' => $this->all_assignments));
return;
}
$assignments_root = rtrim($this->settings_model->get_setting('assignments_root'), '/');
$filename = "{$assignments_root}/assignment_{$assignment_id}/mcq/mcq_without_answer.json";
if (!file_exists($filename)) {
show_404();
}
$data = array('all_assignments' => $this->assignment_model->all_assignments(), 'assignment' => $assignment_id);
$this->twig->display("pages/mcqquestion.twig", $data);
}
/**
* Saves submitted code and adds it to queue for judging
*/
private function _upload()
{
$now = shj_now();
foreach ($this->problems as $item) {
if ($item['id'] == $this->input->post('problem')) {
$this->problem = $item;
break;
}
}
$this->filetype = $this->_language_to_type(strtolower(trim($this->input->post('language'))));
$this->ext = substr(strrchr($_FILES['userfile']['name'], '.'), 1);
// uploaded file extension
$this->file_name = basename($_FILES['userfile']['name'], ".{$this->ext}");
// uploaded file name without extension
if ($this->queue_model->in_queue($this->user->username, $this->problem['id'])) {
show_error('You have already submitted for this problem. Your last submission is still in queue.');
}
if ($this->user->level == 0 && !$this->problem['open']) {
show_error('Selected problem has been closed.');
}
$filetypes = explode(",", $this->problem['allowed_languages']);
foreach ($filetypes as &$filetype) {
$filetype = $this->_language_to_type(strtolower(trim($filetype)));
}
if ($_FILES['userfile']['error'] == 4) {
show_error('No file chosen.');
}
if (!in_array($this->filetype, $filetypes)) {
show_error('This file type is not allowed for this problem.');
}
if (!$this->_match($this->filetype, $this->ext)) {
show_error('This file type does not match your selected language.');
}
if (!preg_match('/^[a-zA-Z0-9_\\-()]+$/', $this->file_name)) {
show_error('Invalid characters in file name.');
}
$user_dir = rtrim($this->problem_root, '/') . '/p' . $this->problem['id'] . '/user/';
if (!file_exists($user_dir)) {
mkdir($user_dir, 0700);
}
$user_dir = rtrim($this->problem_root, '/') . '/p' . $this->problem['id'] . '/user/' . $this->user->username;
if (!file_exists($user_dir)) {
mkdir($user_dir, 0700);
}
$config['upload_path'] = $user_dir;
$config['allowed_types'] = '*';
$config['max_size'] = $this->settings_model->get_setting('file_size_limit');
$config['file_name'] = $this->file_name . "-" . ($this->problem['total_submits'] + 1) . "." . $this->ext;
$config['max_file_name'] = 20;
$config['remove_spaces'] = TRUE;
$this->upload->initialize($config);
if ($this->upload->do_upload('userfile')) {
$result = $this->upload->data();
$this->load->model('submit_model');
$submit_info = array('submit_id' => $this->problem_model->increase_total_submits($this->problem['id']), 'username' => $this->user->username, 'problem' => $this->problem['id'], 'file_name' => $result['raw_name'], 'main_file_name' => $this->file_name, 'file_type' => $this->filetype, 'pre_score' => 0, 'time' => shj_now_str());
$this->probleminfo_model->update_last_submissions($this->problem['id'], $submit_info['time']);
$this->probleminfo_model->update_total_submissions($problem_id, 1);
if ($this->problem['is_upload_only'] == 0) {
$this->queue_model->add_to_queue($submit_info);
process_the_queue();
} else {
$this->submit_model->add_upload_only($submit_info);
}
return TRUE;
}
return FALSE;
}
/**
* Used by ajax request (for selecting final submission)
*/
public function select()
{
if (!$this->input->is_ajax_request()) {
show_404();
}
// Students cannot change their final submission after finish_time + extra_time
if ($this->user->level === 0) {
if (shj_now() > strtotime($this->user->selected_assignment['finish_time']) + $this->user->selected_assignment['extra_time']) {
$json_result = array('done' => 0, 'message' => 'This assignment is finished. You cannot change your final submissions.');
$this->output->set_header('Content-Type: application/json; charset=utf-8');
echo json_encode($json_result);
return;
}
}
$this->form_validation->set_rules('submit_id', 'Submit ID', 'integer|greater_than[0]');
$this->form_validation->set_rules('problem', 'problem', 'integer|greater_than[0]');
$this->form_validation->set_rules('username', 'Username', 'required|min_length[3]|max_length[20]|alpha_numeric');
if ($this->form_validation->run()) {
$username = $this->input->post('username');
if ($this->user->level === 0) {
$username = $this->user->username;
}
$res = $this->submit_model->set_final_submission($username, $this->user->selected_assignment['id'], $this->input->post('problem'), $this->input->post('submit_id'));
if ($res) {
// each time a user changes final submission, we should update scoreboard of that assignment
$this->load->model('scoreboard_model');
$this->scoreboard_model->update_scoreboard($this->user->selected_assignment['id']);
$json_result = array('done' => 1);
} else {
$json_result = array('done' => 0, 'message' => 'Selecting Final Submission Failed');
}
} else {
$json_result = array('done' => 0, 'message' => 'Input Error');
}
$this->output->set_header('Content-Type: application/json; charset=utf-8');
echo json_encode($json_result);
}
/**
* Saves submitted code and adds it to queue for judging
*/
private function _upload()
{
$now = shj_now();
foreach ($this->problems as $item) {
if ($item['id'] == $this->input->post('problem')) {
$this->problem = $item;
break;
}
}
$this->filetype = $this->_language_to_type(strtolower(trim($this->input->post('language'))));
$submitcode = $this->input->post("submitcode");
$this->ext = substr(strrchr($_FILES['userfile']['name'], '.'), 1);
// uploaded file extension
$this->file_name = basename($_FILES['userfile']['name'], ".{$this->ext}");
// uploaded file name without extension
if ($this->queue_model->in_queue($this->user->username, $this->user->selected_assignment['id'], $this->problem['id'])) {
show_error('You have already submitted for this problem. Your last submission is still in queue.');
}
if ($this->user->level == 0 && !$this->user->selected_assignment['open']) {
show_error('Selected assignment has been closed.');
}
if ($now < strtotime($this->user->selected_assignment['start_time'])) {
show_error('Selected assignment has not started.');
}
if ($now > strtotime($this->user->selected_assignment['finish_time']) + $this->user->selected_assignment['extra_time']) {
show_error('Selected assignment has finished.');
}
if (!$this->assignment_model->is_participant($this->user->selected_assignment['participants'], $this->user->username)) {
show_error('You are not registered for submitting.');
}
$filetypes = explode(",", $this->problem['allowed_languages']);
foreach ($filetypes as &$filetype) {
$filetype = $this->_language_to_type(strtolower(trim($filetype)));
}
$user_dir = rtrim($this->assignment_root, '/') . '/assignment_' . $this->user->selected_assignment['id'] . '/p' . $this->problem['id'] . '/' . $this->user->username;
if (!file_exists($user_dir)) {
mkdir($user_dir, 0700);
}
$done = false;
if ($submitcode == "" || $this->filetype == 'zip' || $this->filetype == 'pdf') {
if ($_FILES['userfile']['error'] == 4) {
show_error('No file chosen.');
}
if (!in_array($this->filetype, $filetypes)) {
show_error('This file type is not allowed for this problem.');
}
if (!$this->_match($this->filetype, $this->ext)) {
show_error('This file type does not match your selected language.');
}
if (!preg_match('/^[a-zA-Z0-9_\\-()]+$/', $this->file_name)) {
show_error('Invalid characters in file name.');
}
$config['upload_path'] = $user_dir;
$config['allowed_types'] = '*';
$config['max_size'] = $this->settings_model->get_setting('file_size_limit');
$config['file_name'] = $this->file_name . "-" . ($this->user->selected_assignment['total_submits'] + 1) . "." . $this->ext;
$config['max_file_name'] = 20;
$config['remove_spaces'] = TRUE;
$this->upload->initialize($config);
if ($this->upload->do_upload('userfile')) {
$result = $this->upload->data();
$done = true;
}
} else {
$this->load->helper('file');
$this->ext = $this->_retext($this->filetype);
$this->file_name = "code";
$file_name = "code-" . ($this->user->selected_assignment['total_submits'] + 1) . "." . $this->ext;
$upload_path = $user_dir;
$max_size = $this->settings_model->get_setting('file_size_limit');
$fp = fopen($upload_path . "/" . $file_name, 'w');
//show_error($max_size);
$wr = fwrite($fp, $submitcode, $max_size * 1024);
if (!$wr) {
show_error("Code is too large");
}
fclose($fp);
$result['raw_name'] = "code-" . ($this->user->selected_assignment['total_submits'] + 1);
$done = true;
}
if ($done) {
$this->load->model('submit_model');
$submit_info = array('submit_id' => $this->assignment_model->increase_total_submits($this->user->selected_assignment['id']), 'username' => $this->user->username, 'assignment' => $this->user->selected_assignment['id'], 'problem' => $this->problem['id'], 'file_name' => $result['raw_name'], 'main_file_name' => $this->file_name, 'file_type' => $this->filetype, 'coefficient' => $this->coefficient, 'pre_score' => 0, 'time' => shj_now_str());
if ($this->problem['is_upload_only'] == 0) {
$this->queue_model->add_to_queue($submit_info);
process_the_queue();
} else {
$this->submit_model->add_upload_only($submit_info);
}
$val = $submit_info;
return $val;
}
return FALSE;
}
private function _judge_mcq($assignment_id)
{
$res = $this->assignment_model->assignment_time($assignment_id);
if (shj_now() < strtotime($res['finish_time']) + $res['extra_time']) {
//assignment not yet finished
return FALSE;
} else {
return TRUE;
}
}
public function images($assignment_id = NULL, $imagename = NULL)
{
$assignments_root = rtrim($this->settings_model->get_setting('assignments_root'), '/');
$filename = "{$assignments_root}/assignment_{$assignment_id}/images/{$imagename}";
$assignment = $this->assignment_model->assignment_info($assignment_id);
if ($this->user->level == 0 && shj_now() < strtotime($assignment['start_time'])) {
show_404();
}
if (file_exists($filename)) {
header('Content-Length: ' . filesize($filename));
//<-- sends filesize header
$mime = $this->_getmime(pathinfo($filename, PATHINFO_EXTENSION));
header("Content-Type: {$mime}");
//<-- send mime-type header
header('Content-Disposition: inline; filename="' . $filename . '";');
//<-- sends filename header
readfile($filename);
//<--reads and outputs the file onto the output buffer
die;
//<--cleanup
exit;
//and exit
} else {
show_404();
}
}
/**
* The function is polled for new updates aboud the assignment.
* @return boolean [description]
*/
public function is_update()
{
if (!$this->input->is_ajax_request()) {
show_404();
}
$assignment_id = $this->input->post('assignment');
if ($assignment_id == 0) {
show_404();
}
$assignments_root = rtrim($this->settings_model->get_setting('assignments_root'), '/');
$assignment_info = $this->assignment_model->assignment_time($assignment_id);
if (shj_now() > strtotime($assignment_info['finish_time']) + $assignment_info['extra_time']) {
exit("Assignment Finished");
}
$filename = "{$assignments_root}/assignment_{$assignment_id}/mcq/mcq_without_answer.json";
exit(date("Y m d H:i:s", filemtime($filename)));
}
public function is_public($assignment_id)
{
$assignment = $this->assignment_time($assignment_id);
return $assignment['public'] && shj_now() > strtotime($assignment['finish_time']) + $assignment['extra_time'];
}
/**
* Password Reset Key Is Valid
*
* Returns TRUE if the given password reset key is valid
* And returns an error message if key is invalid
*
* @param $passchange_key
* @return bool|string
*/
public function passchange_is_valid($passchange_key)
{
$query = $this->db->select('passchange_time')->get_where('users', array('passchange_key' => $passchange_key));
if ($query->num_rows() != 1) {
return 'Invalid password reset link.';
}
$time = strtotime($query->row()->passchange_time);
$now = shj_now();
if ($now - $time > 3600 or $now - $time < 0) {
// reset link is valid for 1 hour
return 'The link is expired.';
}
return TRUE;
}