1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * This page provides the Administration -> ... -> Theme selector UI.
19 *
20 * @package core
21 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
22 */
23
24require_once(__DIR__ . '/../config.php');
25require_once($CFG->libdir . '/adminlib.php');
26
27$choose = optional_param('choose', '', PARAM_PLUGIN);
28$reset  = optional_param('reset', 0, PARAM_BOOL);
29$device = optional_param('device', '', PARAM_TEXT);
30$unsettheme = optional_param('unsettheme', 0, PARAM_BOOL);
31$confirmation = optional_param('confirmation', 0, PARAM_BOOL);
32
33admin_externalpage_setup('themeselector');
34
35if (!empty($device)) {
36    // Make sure the device requested is valid.
37    $devices = core_useragent::get_device_type_list();
38    if (!in_array($device, $devices)) {
39        // The provided device isn't a valid device throw an error.
40        print_error('invaliddevicetype');
41    }
42}
43
44unset($SESSION->theme);
45
46if ($reset and confirm_sesskey()) {
47    theme_reset_all_caches();
48} else if ($choose && $confirmation) {
49
50    $theme = theme_config::load($choose);
51    echo $OUTPUT->header();
52    echo $OUTPUT->heading(get_string('themesaved'));
53    echo $OUTPUT->box_start();
54    echo format_text(get_string('choosereadme', 'theme_'.$theme->name), FORMAT_MOODLE);
55    echo $OUTPUT->box_end();
56    echo $OUTPUT->continue_button($CFG->wwwroot . '/theme/index.php');
57    echo $OUTPUT->footer();
58    exit;
59
60} else if ($choose && $device && !theme_is_device_locked($device) && !$unsettheme && confirm_sesskey()) {
61    // Load the theme to make sure it is valid.
62    $theme = theme_config::load($choose);
63
64    // Get the config argument for the chosen device.
65    $themename = core_useragent::get_device_type_cfg_var_name($device);
66    set_config($themename, $theme->name);
67
68    $urlconfirm = new moodle_url('/theme/index.php', array('confirmation' => 1, 'choose' => $choose));
69    redirect($urlconfirm);
70} else if ($device && !theme_is_device_locked($device) && $unsettheme && confirm_sesskey() && ($device != 'default')) {
71    // Unset the theme and continue.
72    unset_config(core_useragent::get_device_type_cfg_var_name($device));
73    $device = '';
74}
75
76// Otherwise, show either a list of devices, or is enabledevicedetection set to no or a
77// device is specified show a list of themes.
78
79$table = new html_table();
80$table->data = array();
81$heading = '';
82if (!empty($CFG->enabledevicedetection) && empty($device)) {
83    $heading = get_string('selectdevice', 'admin');
84    // Display a list of devices that a user can select a theme for.
85
86    $strthemenotselected = get_string('themenoselected', 'admin');
87    $strthemeselect = get_string('themeselect', 'admin');
88
89    // Display the device selection screen.
90    $table->id = 'admindeviceselector';
91    $table->head = array(get_string('devicetype', 'admin'), get_string('currenttheme', 'admin'), get_string('info'));
92
93    $devices = core_useragent::get_device_type_list();
94    foreach ($devices as $thedevice) {
95
96        $headingthemename = ''; // To output the picked theme name when needed.
97        $themename = core_useragent::get_device_type_theme($thedevice);
98        if (!$themename && $thedevice == 'default') {
99            $themename = theme_config::DEFAULT_THEME;
100        }
101        $themelocked = theme_is_device_locked($thedevice);
102
103        $screenshotcell = $strthemenotselected;
104        $unsetthemebutton = '';
105        if ($themename) {
106            // Check the theme exists.
107            $themename = clean_param($themename, PARAM_THEME);
108            if (empty($themename)) {
109                // Likely the theme has been deleted.
110                unset_config(core_useragent::get_device_type_cfg_var_name($thedevice));
111            } else {
112                $strthemename = get_string('pluginname', 'theme_'.$themename);
113                // Link to the screenshot, now mandatory - the image path is hardcoded because we need image from other themes,
114                // not the current one.
115                $screenshoturl = new moodle_url('/theme/image.php',
116                    array('theme' => $themename, 'image' => 'screenshot', 'component' => 'theme'));
117                // Contents of the screenshot/preview cell.
118                $screenshotcell = html_writer::empty_tag('img', array('class' => 'img-responsive img-fluid',
119                    'src' => $screenshoturl, 'alt' => $strthemename));
120                // Show the name of the picked theme.
121                $headingthemename = $OUTPUT->heading($strthemename, 3);
122            }
123            // If not default device then show option to unset theme.
124            if ($thedevice != 'default' && !$themelocked) {
125                $unsetthemestr = get_string('unsettheme', 'admin');
126                $unsetthemeurl = new moodle_url('/theme/index.php',
127                    array('device' => $thedevice, 'sesskey' => sesskey(), 'unsettheme' => true));
128                $unsetthemebutton = new single_button($unsetthemeurl, $unsetthemestr, 'get');
129                $unsetthemebutton = $OUTPUT->render($unsetthemebutton);
130            }
131        }
132
133        $deviceurl = new moodle_url('/theme/index.php', array('device' => $thedevice, 'sesskey' => sesskey()));
134
135        $select = '';
136        if (!$themelocked) {
137            $select = $OUTPUT->render(new single_button($deviceurl, $strthemeselect, 'get'));
138        }
139
140        $lockwarning = '';
141        if ($themelocked) {
142            $lockwarning = html_writer::div(get_string('configoverride', 'admin'), 'alert alert-info');
143        }
144
145        $table->data[] = array(
146            $OUTPUT->heading(ucfirst($thedevice), 3),
147            $screenshotcell,
148            $headingthemename . $lockwarning . $select . $unsetthemebutton
149        );
150    }
151} else {
152    // Either a device has been selected of $CFG->enabledevicedetection is off so display a list
153    // of themes to select.
154    $heading = get_string('selecttheme', 'admin', $device);
155    if (empty($device)) {
156        // If $CFG->enabledevicedetection is off this will return 'default'.
157        $device = core_useragent::get_device_type();
158    }
159
160    $themelocked = theme_is_device_locked($device);
161    $table->id = 'adminthemeselector';
162    $table->head = array(get_string('theme'), get_string('info'));
163
164    $themes = array();
165    if ($themelocked) {
166        $heading = get_string('currenttheme', 'admin');
167        $themename = theme_get_locked_theme_for_device($device);
168        $themedirectory = core_component::get_plugin_directory('theme', $themename);
169        $themes[$themename] = $themedirectory;
170    } else {
171        $themes = core_component::get_plugin_list('theme');
172    }
173
174    foreach ($themes as $themename => $themedir) {
175
176        // Load the theme config.
177        try {
178            $theme = theme_config::load($themename);
179        } catch (Exception $e) {
180            // Bad theme, just skip it for now.
181            continue;
182        }
183        if ($themename !== $theme->name) {
184            // Obsoleted or broken theme, just skip for now.
185            continue;
186        }
187        if (empty($CFG->themedesignermode) && $theme->hidefromselector) {
188            // The theme doesn't want to be shown in the theme selector and as theme
189            // designer mode is switched off we will respect that decision.
190            continue;
191        }
192        $strthemename = get_string('pluginname', 'theme_'.$themename);
193
194        // Build the table row, and also a list of items to go in the second cell.
195        $row = array();
196        $infoitems = array();
197        $rowclasses = array();
198
199        // Set up bools whether this theme is chosen either main or legacy.
200        $ischosentheme = ($themename == core_useragent::get_device_type_theme($device));
201
202        if ($ischosentheme) {
203            // Is the chosen main theme.
204            $rowclasses[] = 'selectedtheme';
205        }
206
207        // Link to the screenshot, now mandatory - the image path is hardcoded because we need image from other themes,
208        // not the current one.
209        $screenshotpath = new moodle_url('/theme/image.php',
210            array('theme' => $themename, 'image' => 'screenshot', 'component' => 'theme'));
211        // Contents of the first screenshot/preview cell.
212        $row[] = html_writer::empty_tag('img', array('class' => 'img-responsive img-fluid',
213            'src' => $screenshotpath, 'alt' => $strthemename));
214        // Contents of the second cell.
215        $infocell = $OUTPUT->heading($strthemename, 3);
216
217        if ($themelocked) {
218            $infocell .= html_writer::div(get_string('configoverride', 'admin'), 'alert alert-info');
219        }
220
221        // Button to choose this as the main theme or unset this theme for devices other then default.
222        if (!$themelocked) {
223            if (($ischosentheme) && ($device != 'default')) {
224                $unsetthemestr = get_string('unsettheme', 'admin');
225                $unsetthemeurl = new moodle_url('/theme/index.php',
226                    array('device' => $device, 'unsettheme' => true, 'sesskey' => sesskey()));
227                $unsetbutton = new single_button($unsetthemeurl, $unsetthemestr, 'get');
228                $infocell .= $OUTPUT->render($unsetbutton);
229            } else if ((!$ischosentheme)) {
230                $setthemestr = get_string('usetheme');
231                $setthemeurl = new moodle_url('/theme/index.php',
232                    array('device' => $device, 'choose' => $themename, 'sesskey' => sesskey()));
233                $setthemebutton = new single_button($setthemeurl, $setthemestr, 'get');
234                $infocell .= $OUTPUT->render($setthemebutton);
235            }
236        }
237
238        $row[] = $infocell;
239
240        $table->data[$themename] = $row;
241        $table->rowclasses[$themename] = join(' ', $rowclasses);
242    }
243}
244echo $OUTPUT->header('themeselector');
245echo $OUTPUT->heading($heading);
246
247$params = array('sesskey' => sesskey(), 'reset' => 1);
248if (!empty($device)) {
249    $params['device'] = $device;
250}
251echo $OUTPUT->single_button(new moodle_url('index.php', $params), get_string('themeresetcaches', 'admin'));
252
253echo html_writer::table($table);
254
255echo $OUTPUT->footer();
256