moodle-mod-customcert/classes/template.php

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<?php
// This file is part of 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/>.
/**
* Class represents a customcert template.
*
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* @package mod_customcert
* @copyright 2015 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();
/**
* Class represents a customcert template.
*
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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 template {
/**
* @var int $id The id of the template.
*/
protected $id;
/**
* @var string $name The name of this template
*/
protected $name;
/**
* @var int $contextid The context id of this template
*/
protected $contextid;
/**
* The constructor.
*
* @param \stdClass $template
*/
public function __construct($template) {
$this->id = $template->id;
$this->name = $template->name;
$this->contextid = $template->contextid;
}
/**
* Handles saving data.
*
* @param \stdClass $data the template data
*/
public function save($data) {
global $DB;
$savedata = new \stdClass();
$savedata->id = $this->id;
$savedata->name = $data->name;
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$savedata->timemodified = time();
$DB->update_record('customcert_templates', $savedata);
}
/**
* Handles adding another page to the template.
*
* @return int the id of the page
*/
public function add_page() {
global $DB;
// Set the page number to 1 to begin with.
$sequence = 1;
// Get the max page number.
$sql = "SELECT MAX(sequence) as maxpage
FROM {customcert_pages} cp
WHERE cp.templateid = :templateid";
if ($maxpage = $DB->get_record_sql($sql, array('templateid' => $this->id))) {
$sequence = $maxpage->maxpage + 1;
}
// New page creation.
$page = new \stdClass();
$page->templateid = $this->id;
$page->width = '210';
$page->height = '297';
$page->sequence = $sequence;
$page->timecreated = time();
$page->timemodified = $page->timecreated;
// Insert the page.
return $DB->insert_record('customcert_pages', $page);
}
/**
* Handles saving page data.
*
* @param \stdClass $data the template data
*/
public function save_page($data) {
global $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('templateid' => $data->tid))) {
// Loop through existing pages.
foreach ($pages as $page) {
// Get the name of the fields we want from the form.
$width = 'pagewidth_' . $page->id;
$height = 'pageheight_' . $page->id;
$leftmargin = 'pageleftmargin_' . $page->id;
$rightmargin = 'pagerightmargin_' . $page->id;
// Create the page data to update the DB with.
$p = new \stdClass();
$p->id = $page->id;
$p->width = $data->$width;
$p->height = $data->$height;
$p->leftmargin = $data->$leftmargin;
$p->rightmargin = $data->$rightmargin;
$p->timemodified = $time;
// Update the page.
$DB->update_record('customcert_pages', $p);
}
}
}
/**
* Handles deleting the template.
*
* @return bool return true if the deletion was successful, false otherwise
*/
public function delete() {
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global $DB;
// Delete the elements.
$sql = "SELECT e.*
FROM {customcert_elements} e
INNER JOIN {customcert_pages} p
ON e.pageid = p.id
WHERE p.templateid = :templateid";
if ($elements = $DB->get_records_sql($sql, array('templateid' => $this->id))) {
foreach ($elements as $element) {
// Get an instance of the element class.
if ($e = \mod_customcert\element::instance($element)) {
$e->delete();
} else {
// The plugin files are missing, so just remove the entry from the DB.
$DB->delete_records('customcert_elements', array('id' => $element->id));
}
}
}
// Delete the pages.
if (!$DB->delete_records('customcert_pages', array('templateid' => $this->id))) {
return false;
}
// Now, finally delete the actual template.
if (!$DB->delete_records('customcert_templates', array('id' => $this->id))) {
return false;
}
return true;
}
/**
* Handles deleting a page from the template.
*
* @param int $pageid the template page
*/
public function delete_page($pageid) {
global $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 = \mod_customcert\element::instance($element)) {
$e->delete();
} else {
// The plugin files are missing, so just remove the entry from the DB.
$DB->delete_records('customcert_elements', array('id' => $element->id));
}
}
}
// 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 sequence = sequence - 1
WHERE templateid = :templateid
AND sequence > :sequence";
$DB->execute($sql, array('templateid' => $this->id, 'sequence' => $page->sequence));
}
/**
* Handles deleting an element from the template.
*
* @param int $elementid the template page
*/
public function delete_element($elementid) {
global $DB;
// Ensure element exists and delete it.
$element = $DB->get_record('customcert_elements', array('id' => $elementid), '*', MUST_EXIST);
// Get an instance of the element class.
if ($e = \mod_customcert\element::instance($element)) {
$e->delete();
} else {
// The plugin files are missing, so just remove the entry from the DB.
$DB->delete_records('customcert_elements', array('id' => $elementid));
}
// Now we want to decrease the sequence numbers of the elements
// that are greater than the element we deleted.
$sql = "UPDATE {customcert_elements}
SET sequence = sequence - 1
WHERE pageid = :pageid
AND sequence > :sequence";
$DB->execute($sql, array('pageid' => $element->pageid, 'sequence' => $element->sequence));
}
/**
* Generate the PDF for the template.
*
* @param bool $preview true if it is a preview, false otherwise
* @param int $userid the id of the user whose certificate we want to view
*/
public function generate_pdf($preview = false, $userid = null) {
global $CFG, $DB, $USER;
if (empty($userid)) {
$user = $USER;
} else {
$user = \core_user::get_user($userid);
}
require_once($CFG->libdir . '/pdflib.php');
// Get the pages for the template, there should always be at least one page for each template.
if ($pages = $DB->get_records('customcert_pages', array('templateid' => $this->id), 'sequence ASC')) {
// Create the pdf object.
$pdf = new \pdf();
// If the template belongs to a certificate then we need to check what permissions we set for it.
if ($protection = $DB->get_field('customcert', 'protection', array('templateid' => $this->id))) {
if (!empty($protection)) {
$protection = explode(', ', $protection);
$pdf->SetProtection($protection);
}
}
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);
$pdf->SetTitle($this->name);
$pdf->SetAutoPageBreak(true, 0);
// Remove full-stop at the end, if it exists, to avoid "..pdf" being created and being filtered by clean_filename.
$filename = rtrim($this->name, '.');
$filename = clean_filename($filename . '.pdf');
// Loop through the pages and display their content.
foreach ($pages as $page) {
// Add the page to the PDF.
if ($page->width > $page->height) {
$orientation = 'L';
} else {
$orientation = 'P';
}
$pdf->AddPage($orientation, array($page->width, $page->height));
$pdf->SetMargins($page->leftmargin, 0, $page->rightmargin);
// Get the elements for the page.
if ($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 = \mod_customcert\element::instance($element)) {
$e->render($pdf, $preview, $user);
}
}
}
}
$pdf->Output($filename, 'D');
}
}
/**
* Handles moving an item on a template.
*
* @param string $itemname the item we are moving
* @param int $itemid the id of the item
* @param string $direction the direction
*/
public function move_item($itemname, $itemid, $direction) {
global $DB;
$table = 'customcert_';
if ($itemname == 'page') {
$table .= 'pages';
} else { // Must be an element.
$table .= 'elements';
}
if ($moveitem = $DB->get_record($table, array('id' => $itemid))) {
// Check which direction we are going.
if ($direction == 'up') {
$sequence = $moveitem->sequence - 1;
} else { // Must be down.
$sequence = $moveitem->sequence + 1;
}
// Get the item we will be swapping with. Make sure it is related to the same template (if it's
// a page) or the same page (if it's an element).
if ($itemname == 'page') {
$params = array('templateid' => $moveitem->templateid);
} else { // Must be an element.
$params = array('pageid' => $moveitem->pageid);
}
$swapitem = $DB->get_record($table, $params + array('sequence' => $sequence));
}
// Check that there is an item to move, and an item to swap it with.
if ($moveitem && !empty($swapitem)) {
$DB->set_field($table, 'sequence', $swapitem->sequence, array('id' => $moveitem->id));
$DB->set_field($table, 'sequence', $moveitem->sequence, array('id' => $swapitem->id));
}
}
/**
* Returns the id of the template.
*
* @return int the id of the template
*/
public function get_id() {
return $this->id;
}
/**
* Returns the name of the template.
*
* @return string the name of the template
*/
public function get_name() {
return $this->name;
}
/**
* Returns the context id.
*
* @return int the context id
*/
public function get_contextid() {
return $this->contextid;
}
/**
* Returns the context id.
*
* @return \context the context
*/
public function get_context() {
return \context::instance_by_id($this->contextid);
}
/**
* Returns the context id.
*
* @return \context_module|null the context module, null if there is none
*/
public function get_cm() {
$context = $this->get_context();
if ($context->contextlevel === CONTEXT_MODULE) {
return get_coursemodule_from_id('customcert', $context->instanceid, 0, false, MUST_EXIST);
}
return null;
}
/**
* Ensures the user has the proper capabilities to manage this template.
*
* @throws \required_capability_exception if the user does not have the necessary capabilities (ie. Fred)
*/
public function require_manage() {
require_capability('mod/customcert:manage', $this->get_context());
}
/**
* Creates a template.
*
* @param string $templatename the name of the template
* @param int $contextid the context id
* @return \mod_customcert\template the template object
*/
public static function create($templatename, $contextid) {
global $DB;
$template = new \stdClass();
$template->name = $templatename;
$template->contextid = $contextid;
$template->timecreated = time();
$template->timemodified = $template->timecreated;
$template->id = $DB->insert_record('customcert_templates', $template);
return new \mod_customcert\template($template);
}
}