436 lines
15 KiB
PHP
436 lines
15 KiB
PHP
<?php
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// This file is part of the customcert module for Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Provides functionality needed by customcert activities.
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*
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* @package mod_customcert
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* @copyright 2016 Mark Nelson <markn@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace mod_customcert;
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defined('MOODLE_INTERNAL') || die();
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/**
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* Class certificate.
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*
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* Helper functionality for certificates.
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*
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* @package mod_customcert
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* @copyright 2016 Mark Nelson <markn@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class certificate {
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/**
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* @var string the print protection variable
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*/
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const PROTECTION_PRINT = 'print';
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/**
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* @var string the modify protection variable
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*/
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const PROTECTION_MODIFY = 'modify';
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/**
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* @var string the copy protection variable
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*/
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const PROTECTION_COPY = 'copy';
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/**
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* @var int the number of issues that will be displayed on each page in the report
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* If you want to display all customcerts on a page set this to 0.
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*/
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const CUSTOMCERT_PER_PAGE = '50';
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/**
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* Handles setting the protection field for the customcert
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*
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* @param \stdClass $data
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* @return string the value to insert into the protection field
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*/
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public static function set_protection($data) {
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$protection = array();
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if (!empty($data->protection_print)) {
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$protection[] = self::PROTECTION_PRINT;
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}
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if (!empty($data->protection_modify)) {
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$protection[] = self::PROTECTION_MODIFY;
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}
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if (!empty($data->protection_copy)) {
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$protection[] = self::PROTECTION_COPY;
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}
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// Return the protection string.
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return implode(', ', $protection);
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}
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/**
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* Handles uploading an image for the customcert module.
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*
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* @param int $draftitemid the draft area containing the files
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* @param int $contextid the context we are storing this image in
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*/
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public static function upload_imagefiles($draftitemid, $contextid) {
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global $CFG;
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// Save the file if it exists that is currently in the draft area.
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require_once($CFG->dirroot . '/lib/filelib.php');
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file_save_draft_area_files($draftitemid, $contextid, 'mod_customcert', 'image', 0);
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}
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/**
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* Return the list of possible fonts to use.
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*/
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public static function get_fonts() {
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global $CFG;
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// Array to store the available fonts.
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$options = array();
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// Location of fonts in Moodle.
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$fontdir = "$CFG->dirroot/lib/tcpdf/fonts";
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// Check that the directory exists.
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if (file_exists($fontdir)) {
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// Get directory contents.
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$fonts = new \DirectoryIterator($fontdir);
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// Loop through the font folder.
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foreach ($fonts as $font) {
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// If it is not a file, or either '.' or '..', or
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// the extension is not php, or we can not open file,
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// skip it.
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if (!$font->isFile() || $font->isDot() || ($font->getExtension() != 'php')) {
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continue;
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}
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// Set the name of the font to null, the include next should then set this
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// value, if it is not set then the file does not include the necessary data.
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$name = null;
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// Some files include a display name, the include next should then set this
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// value if it is present, if not then $name is used to create the display name.
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$displayname = null;
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// Some of the TCPDF files include files that are not present, so we have to
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// suppress warnings, this is the TCPDF libraries fault, grrr.
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@include("$fontdir/$font");
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// If no $name variable in file, skip it.
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if (is_null($name)) {
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continue;
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}
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// Remove the extension of the ".php" file that contains the font information.
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$filename = basename($font, ".php");
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// Check if there is no display name to use.
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if (is_null($displayname)) {
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// Format the font name, so "FontName-Style" becomes "Font Name - Style".
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$displayname = preg_replace("/([a-z])([A-Z])/", "$1 $2", $name);
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$displayname = preg_replace("/([a-zA-Z])-([a-zA-Z])/", "$1 - $2", $displayname);
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}
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$options[$filename] = $displayname;
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}
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ksort($options);
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}
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return $options;
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}
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/**
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* Return the list of possible font sizes to use.
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*/
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public static function get_font_sizes() {
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// Array to store the sizes.
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$sizes = array();
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for ($i = 1; $i <= 60; $i++) {
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$sizes[$i] = $i;
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}
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return $sizes;
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}
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/**
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* Get the time the user has spent in the course.
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*
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* @param int $courseid
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* @return int the total time spent in seconds
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*/
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public static function get_course_time($courseid) {
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global $CFG, $DB, $USER;
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$logmanager = get_log_manager();
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$readers = $logmanager->get_readers();
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$enabledreaders = get_config('tool_log', 'enabled_stores');
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$enabledreaders = explode(',', $enabledreaders);
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// Go through all the readers until we find one that we can use.
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foreach ($enabledreaders as $enabledreader) {
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$reader = $readers[$enabledreader];
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if ($reader instanceof \logstore_legacy\log\store) {
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$logtable = 'log';
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$coursefield = 'course';
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$timefield = 'time';
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break;
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} else if ($reader instanceof \core\log\sql_internal_table_reader) {
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$logtable = $reader->get_internal_log_table_name();
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$coursefield = 'courseid';
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$timefield = 'timecreated';
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break;
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}
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}
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// If we didn't find a reader then return 0.
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if (!isset($logtable)) {
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return 0;
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}
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$sql = "SELECT id, $timefield
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FROM {{$logtable}}
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WHERE userid = :userid
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AND $coursefield = :courseid
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ORDER BY $timefield ASC";
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$params = array('userid' => $USER->id, 'courseid' => $courseid);
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$totaltime = 0;
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if ($logs = $DB->get_recordset_sql($sql, $params)) {
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foreach ($logs as $log) {
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if (!isset($login)) {
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// For the first time $login is not set so the first log is also the first login.
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$login = $log->$timefield;
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$lasthit = $log->$timefield;
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$totaltime = 0;
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}
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$delay = $log->$timefield - $lasthit;
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if ($delay > ($CFG->sessiontimeout * 60)) {
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// The difference between the last log and the current log is more than
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// the timeout Register session value so that we have found a session!
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$login = $log->$timefield;
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} else {
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$totaltime += $delay;
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}
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// Now the actual log became the previous log for the next cycle.
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$lasthit = $log->$timefield;
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}
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return $totaltime;
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}
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return 0;
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}
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/**
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* Returns a list of issued customcerts.
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*
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* @param int $customcertid
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* @param bool $groupmode are we in group mode
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* @param \stdClass $cm the course module
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* @param int $limitfrom
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* @param int $limitnum
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* @param string $sort
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* @return \stdClass the users
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*/
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public static function get_issues($customcertid, $groupmode, $cm, $limitfrom, $limitnum, $sort = '') {
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global $DB;
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// Get the conditional SQL.
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list($conditionssql, $conditionsparams) = self::get_conditional_issues_sql($cm, $groupmode);
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// If it is empty then return an empty array.
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if (empty($conditionsparams)) {
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return array();
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}
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// Add the conditional SQL and the customcertid to form all used parameters.
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$allparams = $conditionsparams + array('customcertid' => $customcertid);
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// Return the issues.
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$ufields = \user_picture::fields('u');
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$sql = "SELECT $ufields, ci.code, ci.timecreated
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FROM {user} u
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INNER JOIN {customcert_issues} ci
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ON u.id = ci.userid
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WHERE u.deleted = 0
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AND ci.customcertid = :customcertid
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$conditionssql";
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if ($sort) {
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$sql .= "ORDER BY " . $sort;
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} else {
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$sql .= "ORDER BY " . $DB->sql_fullname();
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}
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return $DB->get_records_sql($sql, $allparams, $limitfrom, $limitnum);
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}
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/**
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* Returns the total number of issues for a given customcert.
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*
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* @param int $customcertid
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* @param \stdClass $cm the course module
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* @param bool $groupmode the group mode
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* @return int the number of issues
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*/
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public static function get_number_of_issues($customcertid, $cm, $groupmode) {
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global $DB;
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// Get the conditional SQL.
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list($conditionssql, $conditionsparams) = self::get_conditional_issues_sql($cm, $groupmode);
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// If it is empty then return 0.
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if (empty($conditionsparams)) {
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return 0;
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}
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// Add the conditional SQL and the customcertid to form all used parameters.
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$allparams = $conditionsparams + array('customcertid' => $customcertid);
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// Return the number of issues.
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$sql = "SELECT COUNT(u.id) as count
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FROM {user} u
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INNER JOIN {customcert_issues} ci
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ON u.id = ci.userid
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WHERE u.deleted = 0
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AND ci.customcertid = :customcertid
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$conditionssql";
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return $DB->count_records_sql($sql, $allparams);
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}
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/**
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* Returns an array of the conditional variables to use in the get_issues SQL query.
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*
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* @param \stdClass $cm the course module
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* @param bool $groupmode are we in group mode ?
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* @return array the conditional variables
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*/
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public static function get_conditional_issues_sql($cm, $groupmode) {
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global $DB, $USER;
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// Get all users that can manage this customcert to exclude them from the report.
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$context = \context_module::instance($cm->id);
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$conditionssql = '';
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$conditionsparams = array();
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// Get all users that can manage this certificate to exclude them from the report.
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$certmanagers = array_keys(get_users_by_capability($context, 'mod/customcert:manage', 'u.id'));
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$certmanagers = array_merge($certmanagers, array_keys(get_admins()));
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list($sql, $params) = $DB->get_in_or_equal($certmanagers, SQL_PARAMS_NAMED, 'cert');
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$conditionssql .= "AND NOT u.id $sql \n";
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$conditionsparams += $params;
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if ($groupmode) {
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$canaccessallgroups = has_capability('moodle/site:accessallgroups', $context);
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$currentgroup = groups_get_activity_group($cm);
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// If we are viewing all participants and the user does not have access to all groups then return nothing.
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if (!$currentgroup && !$canaccessallgroups) {
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return array('', array());
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}
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if ($currentgroup) {
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if (!$canaccessallgroups) {
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// Guest users do not belong to any groups.
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if (isguestuser()) {
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return array('', array());
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}
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// Check that the user belongs to the group we are viewing.
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$usersgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid);
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if ($usersgroups) {
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if (!isset($usersgroups[$currentgroup])) {
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return array('', array());
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}
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} else { // They belong to no group, so return an empty array.
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return array('', array());
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}
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}
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$groupusers = array_keys(groups_get_members($currentgroup, 'u.*'));
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if (empty($groupusers)) {
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return array('', array());
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}
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list($sql, $params) = $DB->get_in_or_equal($groupusers, SQL_PARAMS_NAMED, 'grp');
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$conditionssql .= "AND u.id $sql ";
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$conditionsparams += $params;
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}
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}
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return array($conditionssql, $conditionsparams);
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}
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/**
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* Get number of certificates for a user.
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*
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* @param int $userid
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* @return int
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*/
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public static function get_number_of_certificates_for_user($userid) {
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global $DB;
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$sql = "SELECT COUNT(*)
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FROM {customcert} c
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INNER JOIN {customcert_issues} ci
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ON c.id = ci.customcertid
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WHERE ci.userid = :userid";
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return $DB->count_records_sql($sql, array('userid' => $userid));
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}
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/**
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* Gets the certificates for the user.
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*
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* @param int $userid
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* @param int $limitfrom
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* @param int $limitnum
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* @param string $sort
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* @return array
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*/
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public static function get_certificates_for_user($userid, $limitfrom, $limitnum, $sort = '') {
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global $DB;
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if (empty($sort)) {
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$sort = 'ci.timecreated DESC';
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}
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$sql = "SELECT c.id, c.name, co.fullname as coursename, ci.code, ci.timecreated
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FROM {customcert} c
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INNER JOIN {customcert_issues} ci
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ON c.id = ci.customcertid
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INNER JOIN {course} co
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ON c.course = co.id
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WHERE ci.userid = :userid
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ORDER BY $sort";
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return $DB->get_records_sql($sql, array('userid' => $userid), $limitfrom, $limitnum);
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}
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/**
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* Generates a 10-digit code of random letters and numbers.
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*
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* @return string
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*/
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public static function generate_code() {
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global $DB;
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$uniquecodefound = false;
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$code = random_string(10);
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while (!$uniquecodefound) {
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if (!$DB->record_exists('customcert_issues', array('code' => $code))) {
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$uniquecodefound = true;
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} else {
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$code = random_string(10);
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}
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}
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return $code;
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}
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}
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