/
email_certificate_task.php
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/
email_certificate_task.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/>.
/**
* A scheduled task for emailing certificates.
*
* @package mod_customcert
* @copyright 2017 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace mod_customcert\task;
use mod_customcert\helper;
/**
* A scheduled task for emailing certificates.
*
* @package mod_customcert
* @copyright 2017 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class email_certificate_task extends \core\task\scheduled_task {
/**
* Get a descriptive name for this task (shown to admins).
*
* @return string
*/
public function get_name() {
return get_string('taskemailcertificate', 'customcert');
}
/**
* Execute.
*/
public function execute() {
global $DB;
// Get all the certificates that have requested someone get emailed.
$emailotherslengthsql = $DB->sql_length('c.emailothers');
$sql = "SELECT c.*, ct.id as templateid, ct.name as templatename, ct.contextid, co.id as courseid,
co.fullname as coursefullname, co.shortname as courseshortname
FROM {customcert} c
JOIN {customcert_templates} ct
ON c.templateid = ct.id
JOIN {course} co
ON c.course = co.id
WHERE (c.emailstudents = :emailstudents
OR c.emailteachers = :emailteachers
OR $emailotherslengthsql >= 3)";
if (!$customcerts = $DB->get_records_sql($sql, ['emailstudents' => 1, 'emailteachers' => 1])) {
return;
}
// The renderers used for sending emails.
$page = new \moodle_page();
$htmlrenderer = $page->get_renderer('mod_customcert', 'email', 'htmlemail');
$textrenderer = $page->get_renderer('mod_customcert', 'email', 'textemail');
foreach ($customcerts as $customcert) {
// Do not process an empty certificate.
$sql = "SELECT ce.*
FROM {customcert_elements} ce
JOIN {customcert_pages} cp
ON cp.id = ce.pageid
JOIN {customcert_templates} ct
ON ct.id = cp.templateid
WHERE ct.contextid = :contextid";
if (!$DB->record_exists_sql($sql, ['contextid' => $customcert->contextid])) {
continue;
}
// Get the context.
$context = \context::instance_by_id($customcert->contextid);
// Get the person we are going to send this email on behalf of.
$userfrom = \core_user::get_noreply_user();
// Store teachers for later.
$teachers = get_enrolled_users($context, 'moodle/course:update');
$courseshortname = format_string($customcert->courseshortname, true, ['context' => $context]);
$coursefullname = format_string($customcert->coursefullname, true, ['context' => $context]);
$certificatename = format_string($customcert->name, true, ['context' => $context]);
// Used to create the email subject.
$info = new \stdClass;
$info->coursename = $courseshortname; // Added for BC, so users who have edited the string don't lose this value.
$info->courseshortname = $courseshortname;
$info->coursefullname = $coursefullname;
$info->certificatename = $certificatename;
// Get a list of all the issues.
$userfields = helper::get_all_user_name_fields('u');
$sql = "SELECT u.id, u.username, $userfields, u.email, ci.id as issueid, ci.emailed
FROM {customcert_issues} ci
JOIN {user} u
ON ci.userid = u.id
WHERE ci.customcertid = :customcertid";
$issuedusers = $DB->get_records_sql($sql, ['customcertid' => $customcert->id]);
// Now, get a list of users who can access the certificate but have not yet.
$enrolledusers = get_enrolled_users(\context_course::instance($customcert->courseid), 'mod/customcert:view');
foreach ($enrolledusers as $enroluser) {
// Check if the user has already been issued.
if (in_array($enroluser->id, array_keys((array) $issuedusers))) {
continue;
}
// Now check if the certificate is not visible to the current user.
$cm = get_fast_modinfo($customcert->courseid, $enroluser->id)->instances['customcert'][$customcert->id];
if (!$cm->uservisible) {
continue;
}
// Don't want to email those with the capability to manage the certificate.
if (has_capability('mod/customcert:manage', $context, $enroluser->id)) {
continue;
}
// Only email those with the capability to receive the certificate.
if (!has_capability('mod/customcert:receiveissue', $context, $enroluser->id)) {
continue;
}
// Check that they have passed the required time.
if (!empty($customcert->requiredtime)) {
if (\mod_customcert\certificate::get_course_time($customcert->courseid,
$enroluser->id) < ($customcert->requiredtime * 60)) {
continue;
}
}
// Ensure the cert hasn't already been issued, e.g via the UI (view.php) - a race condition.
$issueid = $DB->get_field('customcert_issues', 'id',
['userid' => $enroluser->id, 'customcertid' => $customcert->id], IGNORE_MULTIPLE);
if (empty($issueid)) {
// Ok, issue them the certificate.
$issueid = \mod_customcert\certificate::issue_certificate($customcert->id, $enroluser->id);
}
// Add them to the array so we email them.
$enroluser->issueid = $issueid;
$enroluser->emailed = 0;
$issuedusers[] = $enroluser;
}
// Remove all the users who have already been emailed.
foreach ($issuedusers as $key => $issueduser) {
if ($issueduser->emailed) {
unset($issuedusers[$key]);
}
}
// If there are no users to email we can return early.
if (!$issuedusers) {
continue;
}
// Create a directory to store the PDF we will be sending.
$tempdir = make_temp_directory('certificate/attachment');
if (!$tempdir) {
return;
}
// Now, email the people we need to.
foreach ($issuedusers as $user) {
// Set up the user.
\core\cron::setup_user($user);
$userfullname = fullname($user);
$info->userfullname = $userfullname;
// Now, get the PDF.
$template = new \stdClass();
$template->id = $customcert->templateid;
$template->name = $customcert->templatename;
$template->contextid = $customcert->contextid;
$template = new \mod_customcert\template($template);
$filecontents = $template->generate_pdf(false, $user->id, true);
// Set the name of the file we are going to send.
$filename = $courseshortname . '_' . $certificatename;
$filename = \core_text::entities_to_utf8($filename);
$filename = strip_tags($filename);
$filename = rtrim($filename, '.');
$filename = str_replace('&', '_', $filename) . '.pdf';
// Create the file we will be sending.
$tempfile = $tempdir . '/' . md5(microtime() . $user->id) . '.pdf';
file_put_contents($tempfile, $filecontents);
if ($customcert->emailstudents) {
$renderable = new \mod_customcert\output\email_certificate(true, $userfullname, $courseshortname,
$coursefullname, $certificatename, $context->instanceid);
$subject = get_string('emailstudentsubject', 'customcert', $info);
$message = $textrenderer->render($renderable);
$messagehtml = $htmlrenderer->render($renderable);
email_to_user($user, $userfrom, html_entity_decode($subject, ENT_COMPAT), $message,
$messagehtml, $tempfile, $filename);
}
if ($customcert->emailteachers) {
$renderable = new \mod_customcert\output\email_certificate(false, $userfullname, $courseshortname,
$coursefullname, $certificatename, $context->instanceid);
$subject = get_string('emailnonstudentsubject', 'customcert', $info);
$message = $textrenderer->render($renderable);
$messagehtml = $htmlrenderer->render($renderable);
foreach ($teachers as $teacher) {
email_to_user($teacher, $userfrom, html_entity_decode($subject, ENT_COMPAT),
$message, $messagehtml, $tempfile, $filename);
}
}
if (!empty($customcert->emailothers)) {
$others = explode(',', $customcert->emailothers);
foreach ($others as $email) {
$email = trim($email);
if (validate_email($email)) {
$renderable = new \mod_customcert\output\email_certificate(false, $userfullname,
$courseshortname, $coursefullname, $certificatename, $context->instanceid);
$subject = get_string('emailnonstudentsubject', 'customcert', $info);
$message = $textrenderer->render($renderable);
$messagehtml = $htmlrenderer->render($renderable);
$emailuser = new \stdClass();
$emailuser->id = -1;
$emailuser->email = $email;
email_to_user($emailuser, $userfrom, html_entity_decode($subject, ENT_COMPAT), $message,
$messagehtml, $tempfile, $filename);
}
}
}
// Set the field so that it is emailed.
$DB->set_field('customcert_issues', 'emailed', 1, ['id' => $user->issueid]);
}
}
}
}