moodle-mod_htmlcert/lib.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/>.
/**
* Customcert module core interaction API.
*
* @package mod_customcert
* @copyright Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');
/**
* @var string the print protection variable
*/
define('PROTECTION_PRINT', 'print');
/**
* @var string the modify protection variable
*/
define('PROTECTION_MODIFY', 'modify');
/**
* @var string the copy protection variable
*/
define('PROTECTION_COPY', 'copy');
/**
* Add customcert instance.
*
* @param stdClass $customcert
* @param stdClass $mform
* @return int new customcert instance id
*/
function customcert_add_instance($data, $mform) {
global $DB;
$data->protection = customcert_set_protection($data);
$data->timecreated = time();
$data->timemodified = $data->timecreated;
$data->id = $DB->insert_record('customcert', $data);
// Add a page to this certificate.
customcert_add_page($data);
return $data->id;
}
/**
* Update customcert instance.
*
* @param stdClass $data
* @param stdClass $mform
* @return bool true
*/
function customcert_update_instance($data, $mform) {
global $DB;
$data->protection = customcert_set_protection($data);
$data->timemodified = time();
$data->id = $data->instance;
return $DB->update_record('customcert', $data);
}
/**
* Handles setting the protection field for the customcert
*
* @param stdClass $data
* @return string the value to insert into the protection field
*/
function customcert_set_protection($data) {
$protection = array();
if (!empty($data->protection_print)) {
$protection[] = PROTECTION_PRINT;
}
if (!empty($data->protection_modify)) {
$protection[] = PROTECTION_MODIFY;
}
if (!empty($data->protection_copy)) {
$protection[] = PROTECTION_COPY;
}
// Return the protection string.
return implode(', ', $protection);
}
/**
* Given an ID of an instance of this module,
* this function will permanently delete the instance
* and any data that depends on it.
*
* @param int $id
* @return bool true if successful
*/
function customcert_delete_instance($id) {
global $DB;
// Ensure the customcert exists.
if (!$DB->get_record('customcert', array('id' => $id))) {
return false;
}
// Get the course module as it is used when deleting files.
if (!$cm = get_coursemodule_from_instance('customcert', $id)) {
return false;
}
// Delete the customcert instance.
if (!$DB->delete_records('customcert', array('id' => $id))) {
return false;
}
// Delete the elements.
$sql = "SELECT e.*
FROM {customcert_elements} e
INNER JOIN {customcert_pages} p
ON e.pageid = p.id
WHERE p.customcertid = :customcertid";
if ($elements = $DB->get_records_sql($sql, array('customcertid' => $id))) {
foreach ($elements as $element) {
// Get an instance of the element class.
if ($e = customcert_get_element_instance($element)) {
return $e->delete_element();
}
}
}
// Delete the pages.
if (!$DB->delete_records('customcert_pages', array('customcertid' => $id))) {
return false;
}
// Delete the customcert issues.
if (!$DB->delete_records('customcert_issues', array('customcertid' => $id))) {
return false;
}
// Delete any files associated with the customcert.
$context = get_context_instance(CONTEXT_MODULE, $cm->id);
$fs = get_file_storage();
$fs->delete_area_files($context->id);
return true;
}
/**
* This function is used by the reset_course_userdata function in moodlelib.
* This function will remove all posts from the specified customcert
* and clean up any related data.
*
* @param $data the data submitted from the reset course.
* @return array status array
*/
function customcert_reset_userdata($data) {
global $CFG, $DB;
$componentstr = get_string('modulenameplural', 'customcert');
$status = array();
if (!empty($data->reset_customcert)) {
$sql = "SELECT cert.id
FROM {customcert} cert
WHERE cert.course = :courseid";
$DB->delete_records_select('customcert_issues', "customcertid IN ($sql)", array('courseid' => $data->courseid));
$status[] = array('component' => $componentstr, 'item' => get_string('customcertremoved', 'customcert'), 'error' => false);
}
// Updating dates - shift may be negative too.
if ($data->timeshift) {
shift_course_mod_dates('customcert', array('timeopen', 'timeclose'), $data->timeshift, $data->courseid);
$status[] = array('component' => $componentstr, 'item' => get_string('datechanged'), 'error' => false);
}
return $status;
}
/**
* Implementation of the function for printing the form elements that control
* whether the course reset functionality affects the customcert.
*
* @param $mform form passed by reference
*/
function customcert_reset_course_form_definition(&$mform) {
$mform->addElement('header', 'customcertheader', get_string('modulenameplural', 'customcert'));
$mform->addElement('advcheckbox', 'reset_customcert', get_string('deletissuedcustomcerts', 'customcert'));
}
/**
* Course reset form defaults.
*
* @param stdClass $course
* @return array
*/
function customcert_reset_course_form_defaults($course) {
return array('reset_customcert' => 1);
}
/**
* Returns information about received customcert.
* Used for user activity reports.
*
* @param stdClass $course
* @param stdClass $user
* @param stdClass $mod
* @param stdClass $customcert
* @return stdClass the user outline object
*/
function customcert_user_outline($course, $user, $mod, $customcert) {
global $DB;
$result = new stdClass();
if ($issue = $DB->get_record('customcert_issues', array('customcertid' => $customcert->id, 'userid' => $user->id))) {
$result->info = get_string('issued', 'customcert');
$result->time = $issue->timecreated;
} else {
$result->info = get_string('notissued', 'customcert');
}
return $result;
}
/**
* Returns information about received customcert.
* Used for user activity reports.
*
* @param stdClass $course
* @param stdClass $user
* @param stdClass $mod
* @param stdClass $page
* @return string the user complete information
*/
function customcert_user_complete($course, $user, $mod, $customcert) {
global $DB, $OUTPUT;
if ($issue = $DB->get_record('customcert_issues', array('customcertid' => $customcert->id, 'userid' => $user->id))) {
echo $OUTPUT->box_start();
echo get_string('issued', 'customcert') . ": ";
echo userdate($issue->timecreated);
customcert_print_user_files($customcert->id, $user->id);
echo '<br />';
echo $OUTPUT->box_end();
} else {
print_string('notissuedyet', 'customcert');
}
}
/**
* @uses FEATURE_GROUPS
* @uses FEATURE_GROUPINGS
* @uses FEATURE_GROUPMEMBERSONLY
* @uses FEATURE_MOD_INTRO
* @uses FEATURE_COMPLETION_TRACKS_VIEWS
* @uses FEATURE_GRADE_HAS_GRADE
* @uses FEATURE_GRADE_OUTCOMES
* @param string $feature FEATURE_xx constant for requested feature
* @return mixed True if module supports feature, null if doesn't know
*/
function customcert_supports($feature) {
switch ($feature) {
case FEATURE_GROUPS: return true;
case FEATURE_GROUPINGS: return true;
case FEATURE_GROUPMEMBERSONLY: return true;
case FEATURE_MOD_INTRO: return true;
case FEATURE_COMPLETION_TRACKS_VIEWS: return true;
case FEATURE_BACKUP_MOODLE2: return true;
default: return null;
}
}
/**
* Used for course participation report (in case customcert is added).
*
* @return array
*/
function customcert_get_view_actions() {
return array('view', 'view all', 'view report');
}
/**
* Used for course participation report (in case customcert is added).
*
* @return array
*/
function customcert_get_post_actions() {
return array('received');
}
/**
* Function to be run periodically according to the moodle cron.
*/
function customcert_cron () {
return true;
}
/**
* This function extends the settings navigation block for the site.
*
* It is safe to rely on PAGE here as we will only ever be within the module
* context when this is called.
*
* @param settings_navigation $settings
* @param navigation_node $customcertnode
*/
function customcert_extend_settings_navigation(settings_navigation $settings, navigation_node $customcertnode) {
global $PAGE, $CFG;
$keys = $customcertnode->get_children_key_list();
$beforekey = null;
$i = array_search('modedit', $keys);
if ($i === false and array_key_exists(0, $keys)) {
$beforekey = $keys[0];
} else if (array_key_exists($i + 1, $keys)) {
$beforekey = $keys[$i + 1];
}
if (has_capability('mod/customcert:manage', $PAGE->cm->context)) {
$node = navigation_node::create(get_string('editcustomcert', 'customcert'),
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new moodle_url('/mod/customcert/edit.php', array('cmid' => $PAGE->cm->id)),
navigation_node::TYPE_SETTING, null, 'mod_customcert_edit',
new pix_icon('t/edit', ''));
$customcertnode->add_node($node, $beforekey);
}
return $customcertnode->trim_if_empty();
}
/**
* Return the list of possible images to use.
*
* @return array the list of images that can be used.
*/
function customcert_get_images() {
// Create file storage object.
$fs = get_file_storage();
// The array used to store the images.
$arrfiles = array();
$arrfiles[0] = get_string('noimage', 'customcert');
if ($files = $fs->get_area_files(context_system::instance()->id, 'mod_customcert', 'image', false, 'filename', false)) {
foreach ($files as $hash => $file) {
$arrfiles[$hash] = $file->get_filename();
}
}
return $arrfiles;
}
/**
* Handles uploading an image for the customcert module.
*
* @param stdClass $draftiemtid the draft area containing the files
*/
function customcert_upload_imagefiles($draftitemid) {
// Get the filestorage object.
$fs = get_file_storage();
// Save the file if it exists that is currently in the draft area.
file_save_draft_area_files($draftitemid, context_system::instance()->id, 'mod_customcert', 'image', 0);
}
/**
* Return the list of possible elements to add.
*
* @return array the list of images that can be used.
*/
function customcert_get_elements() {
global $CFG;
// Array to store the element types.
$options = array();
// Check that the directory exists.
$elementdir = "$CFG->dirroot/mod/customcert/elements";
if (file_exists($elementdir)) {
// Get directory contents.
$elementfolders = new DirectoryIterator($elementdir);
// Loop through the elements folder.
foreach ($elementfolders as $elementfolder) {
// If it is not a directory or it is '.' or '..', skip it.
if (!$elementfolder->isDir() || $elementfolder->isDot()) {
continue;
}
// Check that the standard class file exists, if not we do
// not want to display it as an option as it will not work.
$foldername = $elementfolder->getFilename();
$classfile = "$elementdir/$foldername/lib.php";
if (file_exists($classfile)) {
// Need to require this file in case if we choose to add this element.
require_once($classfile);
$component = "customcertelement_{$foldername}";
$options[$foldername] = get_string('pluginname', $component);
}
}
}
return $options;
}
/**
* Return the list of possible fonts to use.
*/
function customcert_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.
*/
function customcert_get_font_sizes() {
// Array to store the sizes.
$sizes = array();
for ($i = 1; $i <= 60; $i++) {
$sizes[$i] = $i;
}
return $sizes;
}
/**
* Handles saving page data.
*
* @param stdClass $data the customcert data
*/
function customcert_save_page_data($data) {
global $CFG, $DB;
// Set the time to a variable.
$time = time();
// Get the existing pages and save the page data.
if ($pages = $DB->get_records('customcert_pages', array('customcertid' => $data->id))) {
// Loop through existing pages.
foreach ($pages as $page) {
// Get the name of the fields we want from the form.
$orientation = 'orientation_' . $page->id;
$width = 'width_' . $page->id;
$height = 'height_' . $page->id;
// Create the page data to update the DB with.
$p = new stdClass();
$p->id = $page->id;
$p->orientation = $data->$orientation;
$p->width = $data->$width;
$p->height = $data->$height;
$p->timemodified = $time;
// Update the page.
$DB->update_record('customcert_pages', $p);
// Get the elements for the page.
if ($elements = $DB->get_records('customcert_elements', array('pageid' => $page->id))) {
// Loop through the elements.
foreach ($elements as $element) {
// Get an instance of the element class.
if ($e = customcert_get_element_instance($element)) {
$e->save_form_elements($data);
}
}
}
}
}
}
/**
* Returns an instance of the element class.
*
* @param stdClass $element the element
* @return stdClass|bool returns the instance of the element class, or false if element
* class does not exists.
*/
function customcert_get_element_instance($element) {
global $CFG;
$classfile = "$CFG->dirroot/mod/customcert/elements/{$element->element}/lib.php";
// Ensure this necessary file exists.
if (file_exists($classfile)) {
require_once($classfile);
$classname = "customcert_element_{$element->element}";
return new $classname($element);
}
return false;
}
/**
* Handles adding another element to a page in the customcert.
*
* @param string $element the name of the element
* @param int $pageid the page id we are saving it to
*/
function customcert_add_element($element, $pageid) {
global $CFG;
$classname = "customcert_element_{$element}";
$classname::add_element($element, $pageid);
}
/**
* Handles adding another page to the customcert.
*
* @param stdClass $data the form data
*/
function customcert_add_page($data) {
global $DB;
// If no pageid is passed then we are creating the first page.
if (empty($data->pageid)) {
$pagenumber = 1;
} else { // Create a page after an existing one.
// Get the page we are inserting the new one after.
$currentpage = $DB->get_record('customcert_pages', array('id' => $data->pageid), '*', MUST_EXIST);
// Increase the page numbers of the pages that are going
// to be in front of the new page we are creating
$sql = "UPDATE {customcert_pages}
SET pagenumber = pagenumber + 1
WHERE customcertid = :customcertid
AND pagenumber > :pagenumber";
$DB->execute($sql, array('customcertid' => $currentpage->customcertid,
'pagenumber' => $currentpage->pagenumber));
$pagenumber = $currentpage->pagenumber + 1;
}
// Store time in a variable.
$time = time();
// New page creation.
$page = new stdClass();
$page->customcertid = $data->id;
$page->orientation = 'P';
$page->width = '210';
$page->height = '297';
$page->pagenumber = $pagenumber;
$page->timecreated = $time;
$page->timemodified = $time;
// Insert the page.
$DB->insert_record('customcert_pages', $page);
}
/**
* Handles deleting a page from the customcert.
*
* @param int $pageid the customcert page
*/
function customcert_delete_page($pageid) {
global $CFG, $DB;
// Get the page.
$page = $DB->get_record('customcert_pages', array('id' => $pageid), '*', MUST_EXIST);
// Delete this page.
$DB->delete_records('customcert_pages', array('id' => $page->id));
// The element may have some extra tasks it needs to complete to completely delete itself.
if ($elements = $DB->get_records('customcert_elements', array('pageid' => $page->id))) {
foreach ($elements as $element) {
// Get an instance of the element class.
if ($e = customcert_get_element_instance($element)) {
$e->delete_element();
}
}
}
// Now we want to decrease the page number values of
// the pages that are greater than the page we deleted.
$sql = "UPDATE {customcert_pages}
SET pagenumber = pagenumber - 1
WHERE customcertid = :customcertid
AND pagenumber > :pagenumber";
$DB->execute($sql, array('customcertid' => $page->customcertid,
'pagenumber' => $page->pagenumber));
}
/**
* Returns a list of all the templates.
*
* @param stdClass $element the element
* @param bool returns true if success, false otherwise
*/
function customcert_get_templates() {
global $DB;
return $DB->get_records_menu('customcert_template', array(), 'name ASC', 'id, name');
}
/**
* Get the time the user has spent in the course.
*
* @param int $courseid
* @return int the total time spent in seconds
*/
function customcert_get_course_time($courseid) {
global $CFG, $USER;
set_time_limit(0);
$totaltime = 0;
$sql = "l.course = :courseid AND l.userid = :userid";
if ($logs = get_logs($sql, array('courseid' => $courseid, 'userid' => $USER->id), 'l.time ASC', '', '', $totalcount)) {
foreach ($logs as $log) {
if (!isset($login)) {
// For the first time $login is not set so the first log is also the first login.
$login = $log->time;
$lasthit = $log->time;
$totaltime = 0;
}
$delay = $log->time - $lasthit;
if ($delay > ($CFG->sessiontimeout * 60)) {
// The difference between the last log and the current log is more than
// the timeout register session value meaning we have found a session.
$login = $log->time;
} else {
$totaltime += $delay;
}
// Now the actual log became the previous log for the next cycle.
$lasthit = $log->time;
}
return $totaltime;
}
return 0;
}
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/**
* Returns the total number of issues for a given customcert.
*
* @param int $customcertid
* @param stdClass $cm the course module
* @param bool $groupmode the group mode
* @return int the number of issues
*/
function customcert_get_number_of_issues($customcertid, $cm, $groupmode) {
global $DB;
list($conditionssql, $conditionsparams) = customcert_get_conditional_issues_sql($cm, $groupmode);
// Get all the users that have customcerts issued, should only be one issue per user for a customcert.
$allparams = $conditionsparams + array('customcertid' => $customcertid);
return $DB->count_records_sql("SELECT COUNT(u.*) as count
FROM {user} u
INNER JOIN {customcert_issues} ci
ON u.id = ci.userid
WHERE u.deleted = 0
AND ci.customcertid = :customcertid
$conditionssql",
$allparams);
}
/**
* Returns an array of the conditional variables to use in the get_issues SQL query.
*
* @param stdClass $cm the course module
* @param bool $groupmode are we in group mode ?
* @return array the conditional variables
*/
function customcert_get_conditional_issues_sql($cm, $groupmode) {
global $CFG, $DB;
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// Get all users that can manage this customcert to exclude them from the report.
$context = get_context_instance(CONTEXT_MODULE, $cm->id);
$conditionssql = '';
$conditionsparams = array();
if ($certmanagers = array_keys(get_users_by_capability($context, 'mod/customcert:manage', 'u.id'))) {
list($sql, $params) = $DB->get_in_or_equal($certmanagers, SQL_PARAMS_NAMED, 'cert');
$conditionssql .= "AND NOT u.id $sql \n";
$conditionsparams += $params;
}
$restricttogroup = false;
if ($groupmode) {
$currentgroup = groups_get_activity_group($cm);
if ($currentgroup) {
$restricttogroup = true;
$groupusers = array_keys(groups_get_members($currentgroup, 'u.*'));
if (empty($groupusers)) {
return array();
}
}
}
$restricttogrouping = false;
// If groupmembersonly used, remove users who are not in any group.
if (!empty($CFG->enablegroupings) and $cm->groupmembersonly) {
if ($groupingusers = groups_get_grouping_members($cm->groupingid, 'u.id', 'u.id')) {
$restricttogrouping = true;
} else {
return array();
}
}
if ($restricttogroup || $restricttogrouping) {
if ($restricttogroup) {
$allowedusers = $groupusers;
} else if ($restricttogroup && $restricttogrouping) {
$allowedusers = array_intersect($groupusers, $groupingusers);
} else {
$allowedusers = $groupingusers;
}
list($sql, $params) = $DB->get_in_or_equal($allowedusers, SQL_PARAMS_NAMED, 'grp');
$conditionssql .= "AND u.id $sql \n";
$conditionsparams += $params;
}
return array($conditionssql, $conditionsparams);
}
/**
* Generates a 10-digit code of random letters and numbers.
*
* @return string
*/
function customcert_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;
}
/**
* Generate the PDF for the specified customcert and user.
*
* @param stdClass $customcert
* @param int $userid
*/
function customcert_generate_pdf($customcert, $userid) {
global $CFG, $DB;
// Get the pages for the customcert, there should always be at least one page for each customcert.
if ($pages = $DB->get_records('customcert_pages', array('customcertid' => $customcert->id), 'pagenumber ASC')) {
// Create the pdf object.
$pdf = new pdf();
if (!empty($customcert->protection)) {
$protection = explode(', ', $customcert->protection);
$pdf->SetProtection($protection);
}
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);
$pdf->SetTitle($customcert->name);
// Remove full-stop at the end, if it exists, to avoid "..pdf" being created and being filtered by clean_filename.
$filename = rtrim($customcert->name, '.');
$filename = clean_filename($filename . '.pdf');
// Loop through the pages and display their content.
foreach ($pages as $page) {
// Add the page to the PDF.
$pdf->AddPage($page->orientation, array($page->width, $page->height));
// Get the elements for the page.
if ($elements = $DB->get_records('customcert_elements', array('pageid' => $page->id), 'sequence ASC')) {
// Loop through and display.
foreach ($elements as $element) {
// Get an instance of the element class.
if ($e = customcert_get_element_instance($element)) {
$e->render($pdf, $userid);
}
}
}
}
$pdf->Output($filename, 'D');
}
}