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361 lines
16 KiB
361 lines
16 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* The certificates class is used to generate certificates from inside the
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* gradebook tool.
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* @package chamilo.library.certificates
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*/
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class Certificate extends Model {
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var $table;
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var $columns = array('id','cat_id','score_certificate','created_at','path_certificate');
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/**
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* Certification data
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*/
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var $certificate_data = array();
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/**
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* Student's certification path
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*/
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var $certification_user_path = null;
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var $certification_web_user_path = null;
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var $html_file = null;
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var $qr_file = null;
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var $user_id;
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//If true every time we enter to the certificate URL we would generate a new certificate
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// (good thing because we can edit the certificate and all users will have the latest certificate bad because we load the certificate everytime)
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var $force_certificate_generation = true; //default true
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/**
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* Constructor
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* @param int ID of the certificate. If no ID given, take user_id and try to generate one
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*/
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public function __construct($certificate_id = null) {
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$this->table = Database::get_main_table(TABLE_MAIN_GRADEBOOK_CERTIFICATE);
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$this->certificate_data = null;
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if (isset($certificate_id)) {
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$this->certificate_data = $this->get($certificate_id);
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$this->user_id = $this->certificate_data['user_id'];
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} else {
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//Try with the current user
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$this->user_id = api_get_user_id();
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}
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if ($this->user_id) {
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//Need to be called before any operation
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$this->check_certificate_path();
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//To force certification generation
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if ($this->force_certificate_generation) {
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$this->generate();
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}
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if (isset($this->certificate_data) && $this->certificate_data) {
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if (empty($this->certificate_data['path_certificate'])) {
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$this->generate();
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}
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}
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}
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//Setting the qr and html variables
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if (isset($certificate_id) && !empty($this->certification_user_path)) {
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$pathinfo = pathinfo($this->certificate_data['path_certificate']);
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$this->html_file = $this->certification_user_path.basename($this->certificate_data['path_certificate']);
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$this->qr_file = $this->certification_user_path.$pathinfo['filename'].'_qr.png';
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}
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}
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/**
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* Checks if the certificate user path directory is created
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*/
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public function check_certificate_path()
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{
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$this->certification_user_path = null;
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//Setting certification path
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$path_info = UserManager::get_user_picture_path_by_id($this->user_id, 'system');
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$web_path_info = UserManager::get_user_picture_path_by_id($this->user_id, 'web');
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if (!empty($path_info) && isset($path_info['dir'])) {
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$this->certification_user_path = $path_info['dir'].'certificate/';
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$this->certification_web_user_path = $web_path_info['dir'].'certificate/';
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if (!is_dir($path_info['dir'])) {
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mkdir($path_info['dir'], 0777, true);
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}
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if (!is_dir($this->certification_user_path)) {
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mkdir($this->certification_user_path, 0777);
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}
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}
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}
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/**
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* Deletes the current certificate object. This is generally triggered by
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* the teacher from the gradebook tool to re-generate the certificate because
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* the original version wa flawed.
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*/
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public function delete($force_delete = false) {
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if (!empty($this->certificate_data)) {
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if (!is_null($this->html_file) || $this->html_file != '' || strlen($this->html_file)) {
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//Deleting HTML file
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if (is_file($this->html_file)) {
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@unlink($this->html_file);
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if (is_file($this->html_file) === false) {
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$delete_db = true;
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} else {
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$delete_db = false;
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}
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}
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//Deleting QR code PNG image file
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if (is_file($this->qr_file)) {
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@unlink($this->qr_file);
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}
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if ($delete_db || $force_delete) {
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return parent::delete($this->certificate_data['id']);
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}
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} else {
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return parent::delete($this->certificate_data['id']);
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}
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}
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return false;
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}
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/**
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* Generates an HTML Certificate and fills the path_certificate field in the DB
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* */
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public function generate($params = array()) {
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//The user directory should be set
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if (empty($this->certification_user_path) && $this->force_certificate_generation == false) {
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return false;
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}
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require_once api_get_path(SYS_CODE_PATH).'gradebook/lib/be.inc.php';
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require_once api_get_path(SYS_CODE_PATH).'gradebook/lib/gradebook_functions.inc.php';
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require_once api_get_path(SYS_CODE_PATH).'gradebook/lib/scoredisplay.class.php';
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$params['hide_print_button'] = isset($params['hide_print_button']) ? true : false;
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$my_category = Category :: load($this->certificate_data['cat_id']);
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if (isset($my_category[0]) && $my_category[0]->is_certificate_available($this->user_id)) {
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$user = api_get_user_info($this->user_id);
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$scoredisplay = ScoreDisplay :: instance();
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$scorecourse = $my_category[0]->calc_score($this->user_id);
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$scorecourse_display = (isset($scorecourse) ? $scoredisplay->display_score($scorecourse,SCORE_AVERAGE) : get_lang('NoResultsAvailable'));
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//Prepare all necessary variables:
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$organization_name = api_get_setting('Institution');
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//$portal_name = api_get_setting('siteName');
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$stud_fn = $user['firstname'];
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$stud_ln = $user['lastname'];
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//@todo this code is not needed
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$certif_text = sprintf(get_lang('CertificateWCertifiesStudentXFinishedCourseYWithGradeZ'), $organization_name, $stud_fn.' '.$stud_ln, $my_category[0]->get_name(), $scorecourse_display);
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$certif_text = str_replace("\\n","\n", $certif_text);
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//If the gradebook is related to skills we added the skills to the user
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$skill = new Skill();
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$skill->add_skill_to_user($this->user_id, $this->certificate_data['cat_id']);
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if (is_dir($this->certification_user_path)) {
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if (!empty($this->certificate_data)) {
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$new_content_html = get_user_certificate_content($this->user_id, $my_category[0]->get_course_code(), false, $params['hide_print_button']);
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if ($my_category[0]->get_id() == strval(intval($this->certificate_data['cat_id']))) {
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$name = $this->certificate_data['path_certificate'];
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$my_path_certificate = $this->certification_user_path.basename($name);
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if (file_exists($my_path_certificate) && !empty($name) && !is_dir($my_path_certificate) && $this->force_certificate_generation == false) {
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//Seems that the file was already generated
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return true;
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} else {
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//Creating new name
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$name = md5($this->user_id.$this->certificate_data['cat_id']).'.html';
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$my_path_certificate = $this->certification_user_path.$name;
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$path_certificate ='/'.$name;
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//Getting QR filename
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$file_info = pathinfo($path_certificate);
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$qr_code_filename = $this->certification_user_path.$file_info['filename'].'_qr.png';
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$my_new_content_html = str_replace('((certificate_barcode))', Display::img($this->certification_web_user_path.$file_info['filename'].'_qr.png', 'QR'), $new_content_html['content']);
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$my_new_content_html = mb_convert_encoding($my_new_content_html,'UTF-8', api_get_system_encoding());
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$result = @file_put_contents($my_path_certificate, $my_new_content_html);
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if ($result) {
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//Updating the path
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self::update_user_info_about_certificate($this->certificate_data['cat_id'], $this->user_id, $path_certificate);
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$this->certificate_data['path_certificate'] = $path_certificate;
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if ($this->html_file_is_generated()) {
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if (!empty($file_info)) {
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$text = $this->parse_certificate_variables($new_content_html['variables']);
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$this->generate_qr($text, $qr_code_filename);
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}
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}
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}
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return $result;
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}
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}
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}
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}
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}
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return false;
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}
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/**
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* update user info about certificate
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* @param int The category id
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* @param int The user id
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* @param string the path name of the certificate
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* @return void()
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*/
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function update_user_info_about_certificate ($cat_id,$user_id,$path_certificate) {
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$table_certificate = Database::get_main_table(TABLE_MAIN_GRADEBOOK_CERTIFICATE);
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if (!UserManager::is_user_certified($cat_id,$user_id)) {
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$sql='UPDATE '.$table_certificate.' SET path_certificate="'.Database::escape_string($path_certificate).'"
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WHERE cat_id="'.intval($cat_id).'" AND user_id="'.intval($user_id).'" ';
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Database::query($sql);
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}
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}
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/**
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*
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* Check if the file was generated
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*
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* @return boolean
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*/
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function html_file_is_generated() {
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if (empty($this->certification_user_path)) {
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return false;
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}
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if (!empty($this->certificate_data) && isset($this->certificate_data['path_certificate']) && !empty($this->certificate_data['path_certificate'])) {
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return true;
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}
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return false;
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}
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/**
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* Generates a QR code for the certificate. The QR code embeds the text given
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* @param string Text to be added in the QR code
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* @param string file path of the image
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* */
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public function generate_qr($text, $path) {
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//Make sure HTML certificate is generated
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if (!empty($text) && !empty($path)) {
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require_once api_get_path(LIBRARY_PATH).'phpqrcode/qrlib.php';
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//L low, M - Medium, L large error correction
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return QRcode::png($text, $path, 'M', 2, 2);
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}
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return false;
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}
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/**
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* Transforms certificate tags into text values. This function is very static
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* (it doesn't allow for much flexibility in terms of what tags are printed).
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* @param array Contains two array entris: first are the headers, second is an array of contents
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* @return string The translated string
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*/
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public function parse_certificate_variables($array) {
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$text = '';
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$headers = $array[0];
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$content = $array[1];
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$final_content = array();
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if (!empty($content)) {
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foreach($content as $key => $value) {
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$my_header = str_replace(array('((', '))') , '', $headers[$key]);
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$final_content[$my_header] = $value;
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}
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}
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/* Certificate tags
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*
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0 => string '((user_firstname))' (length=18)
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1 => string '((user_lastname))' (length=17)
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2 => string '((gradebook_institution))' (length=25)
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3 => string '((gradebook_sitename))' (length=22)
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4 => string '((teacher_firstname))' (length=21)
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5 => string '((teacher_lastname))' (length=20)
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6 => string '((official_code))' (length=17)
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7 => string '((date_certificate))' (length=20)
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8 => string '((course_code))' (length=15)
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9 => string '((course_title))' (length=16)
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10 => string '((gradebook_grade))' (length=19)
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11 => string '((certificate_link))' (length=20)
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12 => string '((certificate_link_html))' (length=25)
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13 => string '((certificate_barcode))' (length=23)
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*/
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$break_space = " \n\r ";
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$text = $final_content['gradebook_institution'].' - '.$final_content['gradebook_sitename'].' - '.get_lang('Certification').$break_space.
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get_lang('Student'). ': '.$final_content['user_firstname'].' '.$final_content['user_lastname'].$break_space.
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get_lang('Teacher'). ': '.$final_content['teacher_firstname'].' '.$final_content['teacher_lastname'].$break_space.
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get_lang('Date'). ': '.$final_content['date_certificate'].$break_space.
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get_lang('Score'). ': '.$final_content['gradebook_grade'].$break_space.
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'URL'. ': '.$final_content['certificate_link'];
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return $text;
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}
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/**
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* Shows the student's certificate (HTML file). If the global setting
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* allow_public_certificates is set to 'false', no certificate can be printed.
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* If the global allow_public_certificates is set to 'true' and the course
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* setting allow_public_certificates is set to 0, no certificate *in this
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* course* can be printed (for anonymous users). Connected users can always
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* print them.
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*/
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public function show() {
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// Special rules for anonymous users
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$failed = false;
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if (api_is_anonymous()) {
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if (api_get_setting('allow_public_certificates') != 'true') {
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// The "non-public" setting is set, so do not print
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$failed = true;
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} else {
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// Check the course-level setting to make sure the certificate
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// can be printed publicly
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if (isset($this->certificate_data) && isset($this->certificate_data['cat_id'])) {
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$gradebook = new Gradebook();
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$gradebook_info = $gradebook->get($this->certificate_data['cat_id']);
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if (!empty($gradebook_info['course_code'])) {
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$allow_public_certificates = api_get_course_setting('allow_public_certificates', $gradebook_info['course_code']);
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if ($allow_public_certificates == 0) {
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// Printing not allowed
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$failed = true;
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}
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} else {
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// No course ID defined (should never get here)
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Display :: display_reduced_header();
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Display :: display_warning_message(get_lang('NoCertificateAvailable'));
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exit;
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}
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}
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}
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}
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if ($failed) {
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Display :: display_reduced_header();
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Display :: display_warning_message(get_lang('CertificateExistsButNotPublic'));
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exit;
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}
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//Read file or preview file
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if (!empty($this->certificate_data['path_certificate'])) {
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$user_certificate = $this->certification_user_path.basename($this->certificate_data['path_certificate']);
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if (file_exists($user_certificate)) {
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header('Content-Type: text/html; charset='. api_get_system_encoding());
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echo @file_get_contents($user_certificate);
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}
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} else {
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Display :: display_reduced_header();
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Display :: display_warning_message(get_lang('NoCertificateAvailable'));
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}
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exit;
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}
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}
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