lib.php

<?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/>.

/**
 * @package     theme_ltiessential
 * @copyright   2019 Gareth J Barnard
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
function theme_ltiessential_process_css($css, $theme) {
    global $PAGE, $CFG;
    $outputus = $PAGE->get_renderer('theme_ltiessential', 'core');
    \theme_essential\toolbox::set_core_renderer($outputus);

    if (file_exists("$CFG->dirroot/theme/essential/lib.php")) {
        require_once("$CFG->dirroot/theme/essential/lib.php");
    } else if (!empty($CFG->themedir) and file_exists("$CFG->themedir/essential/lib.php")) {
        require_once("$CFG->themedir/essential/lib.php");
    } // else will just fail when cannot find theme_essential_process_css!
    $css = theme_essential_process_css($css, $theme);

    // Set custom CSS.
    $customcss = \theme_essential\toolbox::get_setting('ltiessentialcustomcss');
    $css = theme_ltiessential_set_customcss($css, $customcss);

    // Finally return processed CSS.
    return $css;
}

function theme_ltiessential_set_customcss($css, $customcss) {
    $tag = '[[setting:ltiessentialcustomcss]]';
    $replacement = $customcss;
    $css = str_replace($tag, $replacement, $css);
    return $css;
}

/**
 * Serves any files associated with the theme settings.
 *
 * @param stdClass $course.
 * @param stdClass $cm.
 * @param context $context.
 * @param string $filearea.
 * @param array $args.
 * @param bool $forcedownload.
 * @param array $options.
 * @return bool.
 */
function theme_ltiessential_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options = array()) {
    static $theme;
    if (empty($theme)) {
        $theme = theme_config::load('ltiessential');
    }
    if ($context->contextlevel == CONTEXT_SYSTEM) {
        // By default, theme files must be cache-able by both browsers and proxies.  From 'More' theme.
        if (!array_key_exists('cacheability', $options)) {
            $options['cacheability'] = 'public';
        }
        if ($filearea === 'logo') {
            return $theme->setting_file_serve('logo', $args, $forcedownload, $options);
        } else if ($filearea === 'pagebackground') {
            return $theme->setting_file_serve('pagebackground', $args, $forcedownload, $options);
        } else if ($filearea === 'favicon') {
            return $theme->setting_file_serve('favicon', $args, $forcedownload, $options);
        } else if ($filearea === 'headerbackground') {
            return $theme->setting_file_serve('headerbackground', $args, $forcedownload, $options);
        } else if ($filearea === 'iphoneicon') {
            return $theme->setting_file_serve('iphoneicon', $args, $forcedownload, $options);
        } else if ($filearea === 'iphoneretinaicon') {
            return $theme->setting_file_serve('iphoneretinaicon', $args, $forcedownload, $options);
        } else if ($filearea === 'ipadicon') {
            return $theme->setting_file_serve('ipadicon', $args, $forcedownload, $options);
        } else if ($filearea === 'ipadretinaicon') {
            return $theme->setting_file_serve('ipadretinaicon', $args, $forcedownload, $options);
        } else {
            send_file_not_found();
        }
    } else {
        send_file_not_found();
    }
}