moodle-local_mycerts/classes/certificate.php

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