Proyectos de Subversion Moodle

<?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 {

    /**

     * @var string The barcode type.

     */

    const BARCODETYPE = 'QRCODE';

    /**

     * This function renders the form elements when adding a customcert element.

     *

     * @param \MoodleQuickForm $mform the edit_form instance

     */

    public function render_form_elements($mform) {

        \mod_customcert\element_helper::render_form_element_width($mform);

        \mod_customcert\element_helper::render_form_element_height($mform);

        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 = [];

        // Validate the width.

        $errors += \mod_customcert\element_helper::validate_form_element_width($data, false);

        // Validate the height.

        $errors += \mod_customcert\element_helper::validate_form_element_height($data, false);

        if ($this->showposxy) {

            $errors += \mod_customcert\element_helper::validate_form_element_position($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 \MoodleQuickForm $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, c.verifyany, 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, ['userid' => $user->id, 'pageid' => $this->get_pageid()],

                '*', MUST_EXIST);

            $code = $issue->code;

            $context = \context::instance_by_id($issue->contextid);

            $urlparams = [

                'code' => $code,

                'qrcode' => 1,

            ];

            // We only add the 'contextid' to the link if the site setting for verifying all certificates is off,

            // or if the individual certificate doesn't allow verification. However, if the user has the

            // mod/customcert:verifyallcertificates then they can verify anything regardless.

            $verifyallcertificatessitesetting = get_config('customcert', 'verifyallcertificates');

            $verifycertificateactivitysettings = $issue->verifyany;

            $canverifyallcertificates = has_capability('mod/customcert:verifyallcertificates', $context);

            if ((!$verifyallcertificatessitesetting || !$verifycertificateactivitysettings)

                    && !$canverifyallcertificates) {

                $urlparams['contextid'] = $issue->contextid;

            }

            $qrcodeurl = new \moodle_url('/mod/customcert/verify_certificate.php', $urlparams);

            $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);

    }

}