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Added QR code element (#146)

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This commit is contained in:
Mark Nelson 2019-01-03 11:05:25 +08:00
parent a05996d656
commit 813fae127c
7 changed files with 323 additions and 2 deletions
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1
classes/element.php
View file

@ -240,6 +240,7 @@ abstract class element {
element_helper::render_form_element_position($mform);
}
element_helper::render_form_element_width($mform);
element_helper::render_form_element_refpoint($mform);
}
/**

9
classes/element_helper.php
View file

@ -186,10 +186,19 @@ class element_helper {
$mform->setType('width', PARAM_INT);
$mform->setDefault('width', 0);
$mform->addHelpButton('width', 'elementwidth', 'customcert');
}
/**
* Helper function to render the refpoint element.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance.
*/
public static function render_form_element_refpoint($mform) {
$refpointoptions = array();
$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPLEFT] = get_string('topleft', 'customcert');
$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPCENTER] = get_string('topcenter', 'customcert');
$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPRIGHT] = get_string('topright', 'customcert');
$mform->addElement('select', 'refpoint', get_string('refpoint', 'customcert'), $refpointoptions);
$mform->setType('refpoint', PARAM_INT);
$mform->setDefault('refpoint', self::CUSTOMCERT_REF_POINT_TOPCENTER);

202
element/qrcode/classes/element.php Normal file
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@ -0,0 +1,202 @@
<?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/>.
/**
* This file contains the customcert element QR code's core interaction API.
*
* @package customcertelement_qrcode
* @copyright 2019 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace customcertelement_qrcode;
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir . '/tcpdf/tcpdf_barcodes_2d.php');
/**
* The customcert element QR code's core interaction API.
*
* @package customcertelement_qrcode
* @copyright 2019 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class element extends \mod_customcert\element {
const BARCODETYPE = 'QRCODE';
/**
* This function renders the form elements when adding a customcert element.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance
*/
public function render_form_elements($mform) {
\mod_customcert\element_helper::render_form_element_width($mform);
$mform->addElement('text', 'height', get_string('height', 'customcertelement_qrcode'), array('size' => 10));
$mform->setType('height', PARAM_INT);
$mform->setDefault('height', 0);
$mform->addHelpButton('height', 'height', 'customcertelement_qrcode');
if ($this->showposxy) {
\mod_customcert\element_helper::render_form_element_position($mform);
}
}
/**
* Performs validation on the element values.
*
* @param array $data the submitted data
* @param array $files the submitted files
* @return array the validation errors
*/
public function validate_form_elements($data, $files) {
// Array to return the errors.
$errors = [];
// Check if height is not set, or not numeric or less than 0.
if ((!isset($data['height'])) || (!is_numeric($data['height'])) || ($data['height'] < 0)) {
$errors['height'] = get_string('invalidheight', 'customcertelement_qrcode');
}
if ($this->showposxy) {
$errors += \mod_customcert\element_helper::validate_form_element_position($data);
}
$errors += \mod_customcert\element_helper::validate_form_element_width($data);
return $errors;
}
/**
* This will handle how form data will be saved into the data column in the
* customcert_elements table.
*
* @param \stdClass $data the form data
* @return string the json encoded array
*/
public function save_unique_data($data) {
$arrtostore = [
'width' => !empty($data->width) ? (int)$data->width : 0,
'height' => !empty($data->height) ? (int)$data->height : 0
];
return json_encode($arrtostore);
}
/**
* Sets the data on the form when editing an element.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance
*/
public function definition_after_data($mform) {
parent::definition_after_data($mform);
// Set the image, width, height and alpha channel for this element.
if (!empty($this->get_data())) {
$imageinfo = json_decode($this->get_data());
if (!empty($imageinfo->height)) {
$element = $mform->getElement('height');
$element->setValue($imageinfo->height);
}
}
}
/**
* Handles rendering the element on the pdf.
*
* @param \pdf $pdf the pdf object
* @param bool $preview true if it is a preview, false otherwise
* @param \stdClass $user the user we are rendering this for
*/
public function render($pdf, $preview, $user) {
global $DB;
// If there is no element data, we have nothing to display.
if (empty($this->get_data())) {
return;
}
$imageinfo = json_decode($this->get_data());
if ($preview) {
// Generate the URL to verify this.
$qrcodeurl = new \moodle_url('/');
$qrcodeurl = $qrcodeurl->out(false);
} else {
// Get the information we need.
$sql = "SELECT c.id, ct.contextid, ci.code
FROM {customcert_issues} ci
JOIN {customcert} c
ON ci.customcertid = c.id
JOIN {customcert_templates} ct
ON c.templateid = ct.id
JOIN {customcert_pages} cp
ON cp.templateid = ct.id
WHERE ci.userid = :userid
AND cp.id = :pageid";
// Now we can get the issue for this user.
$issue = $DB->get_record_sql($sql, array('userid' => $user->id, 'pageid' => $this->get_pageid()),
'*', MUST_EXIST);
$code = $issue->code;
// Generate the URL to verify this.
$qrcodeurl = new \moodle_url('/mod/customcert/verify_certificate.php',
[
'contextid' => $issue->contextid,
'code' => $code,
'qrcode' => 1
]
);
$qrcodeurl = $qrcodeurl->out(false);
}
$barcode = new \TCPDF2DBarcode($qrcodeurl, self::BARCODETYPE);
$image = $barcode->getBarcodePngData($imageinfo->width, $imageinfo->height);
$location = make_request_directory() . '/target';
file_put_contents($location, $image);
$pdf->Image($location, $this->get_posx(), $this->get_posy(), $imageinfo->width, $imageinfo->height);
}
/**
* Render the element in html.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*
* @return string the html
*/
public function render_html() {
// If there is no element data, we have nothing to display.
if (empty($this->get_data())) {
return;
}
$imageinfo = json_decode($this->get_data());
$qrcodeurl = new \moodle_url('/');
$qrcodeurl = $qrcodeurl->out(false);
$barcode = new \TCPDF2DBarcode($qrcodeurl, self::BARCODETYPE);
return $barcode->getBarcodeHTML($imageinfo->width / 10, $imageinfo->height / 10);
}
}

46
element/qrcode/classes/privacy/provider.php Normal file
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@ -0,0 +1,46 @@
<?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/>.
/**
* Privacy Subsystem implementation for customcertelement_qrcode.
*
* @package customcertelement_qrcode
* @copyright 2019 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace customcertelement_qrcode\privacy;
defined('MOODLE_INTERNAL') || die();
/**
* Privacy Subsystem for customcertelement_qrcode implementing null_provider.
*
* @copyright 2019 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class provider implements \core_privacy\local\metadata\null_provider {
/**
* Get the language string identifier with the component's language
* file to explain why this plugin stores no data.
*
* @return string
*/
public static function get_reason() : string {
return 'privacy:metadata';
}
}

30
element/qrcode/lang/en/customcertelement_qrcode.php Normal file
View file

@ -0,0 +1,30 @@
<?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/>.
/**
* Strings for component 'customcertelement_qrcode', language 'en'.
*
* @package customcertelement_qrcode
* @copyright 2019 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
$string['height'] = 'Height';
$string['height_help'] = 'Height help';
$string['pluginname'] = 'QR code';
$string['privacy:metadata'] = 'The QR code plugin does not store any personal data.';
$string['width'] = 'Width';
$string['width_help'] = 'width help';

29
element/qrcode/version.php Normal file
View file

@ -0,0 +1,29 @@
<?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/>.
/**
* This file contains the version information for the QR code plugin.
*
* @package customcertelement_qrcode
* @copyright 2019 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.');
$plugin->version = 2018120300; // The current module version (Date: YYYYMMDDXX).
$plugin->requires = 2018120300; // Requires this Moodle version (3.6).
$plugin->component = 'customcertelement_qrcode';

6
verify_certificate.php
View file

@ -28,6 +28,7 @@ require_once('../../config.php');
$contextid = optional_param('contextid', context_system::instance()->id, PARAM_INT);
$code = optional_param('code', '', PARAM_ALPHANUM); // The code for the certificate we are verifying.
$qrcode = optional_param('qrcode', false, PARAM_BOOL);
$context = context::instance_by_id($contextid);
@ -87,7 +88,7 @@ if ($checkallofsite) {
// The form we are using to verify these codes.
$form = new \mod_customcert\verify_certificate_form($pageurl);
if ($form->get_data()) {
if ($code) {
$result = new stdClass();
$result->issues = array();
@ -128,7 +129,10 @@ if ($form->get_data()) {
echo $OUTPUT->header();
echo $OUTPUT->heading($heading);
// Don't show the form if we are coming from a QR code.
if (!$qrcode) {
echo $form->display();
}
if (isset($result)) {
$renderer = $PAGE->get_renderer('mod_customcert');
$result = new \mod_customcert\output\verify_certificate_results($result);