admin/lib.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * This file contains functions used by the admin pages
  20  *
  21  * @since Moodle 2.1
  22  * @package admin
  23  * @copyright 2011 Andrew Davis
  24  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 /**
  30  * Return a list of page types
  31  * @param string $pagetype current page type
  32  * @param stdClass $parentcontext Block's parent context
  33  * @param stdClass $currentcontext Current context of block
  34  */
  35 function admin_page_type_list($pagetype, $parentcontext, $currentcontext) {
  36     $array = array(
  37         'admin-*' => get_string('page-admin-x', 'pagetype'),
  38         $pagetype => get_string('page-admin-current', 'pagetype')
  39     );
  40     return $array;
  41 }
  42
  43 /**
  44  * File serving.
  45  *
  46  * @param stdClass $course The course object.
  47  * @param stdClass $cm The cm object.
  48  * @param context $context The context object.
  49  * @param string $filearea The file area.
  50  * @param array $args List of arguments.
  51  * @param bool $forcedownload Whether or not to force the download of the file.
  52  * @param array $options Array of options.
  53  * @return void|false
  54  */
  55 function core_admin_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options = array()) {
  56     global $CFG;
  57
  58     if (in_array($filearea, ['logo', 'logocompact', 'favicon'])) {
  59         $size = array_shift($args); // The path hides the size.
  60         $itemid = clean_param(array_shift($args), PARAM_INT);
  61         $filename = clean_param(array_shift($args), PARAM_FILE);
  62         $themerev = theme_get_revision();
  63         if ($themerev <= 0) {
  64             // Normalise to 0 as -1 doesn't place well with paths.
  65              $themerev = 0;
  66         }
  67
  68         // Extract the requested width and height.
  69         $maxwidth = 0;
  70         $maxheight = 0;
  71         if (preg_match('/^\d+x\d+$/', $size)) {
  72             list($maxwidth, $maxheight) = explode('x', $size);
  73             $maxwidth = clean_param($maxwidth, PARAM_INT);
  74             $maxheight = clean_param($maxheight, PARAM_INT);
  75         }
  76
  77         $lifetime = 0;
  78         if ($itemid > 0 && $themerev == $itemid) {
  79             // The itemid is $CFG->themerev, when 0 or less no caching. Also no caching when they don't match.
  80             $lifetime = DAYSECS * 60;
  81         }
  82
  83         // Anyone, including guests and non-logged in users, can view the logos.
  84         $options = ['cacheability' => 'public'];
  85
  86         // Check if we've got a cached file to return. When lifetime is 0 then we don't want to cached one.
  87         $candidate = $CFG->localcachedir . "/core_admin/$themerev/$filearea/{$maxwidth}x{$maxheight}/$filename";
  88         if (file_exists($candidate) && $lifetime > 0) {
  89             send_file($candidate, $filename, $lifetime, 0, false, false, '', false, $options);
  90         }
  91
  92         // Find the original file.
  93         $fs = get_file_storage();
  94         $filepath = "/{$context->id}/core_admin/{$filearea}/0/{$filename}";
  95         if (!$file = $fs->get_file_by_hash(sha1($filepath))) {
  96             send_file_not_found();
  97         }
  98
  99         // No need for resizing, but if the file should be cached we save it so we can serve it fast next time.
 100         if (empty($maxwidth) && empty($maxheight)) {
 101             if ($lifetime) {
 102                 file_safe_save_content($file->get_content(), $candidate);
 103             }
 104             send_stored_file($file, $lifetime, 0, false, $options);
 105         }
 106
 107         // Proceed with the resizing.
 108         $filedata = $file->resize_image($maxwidth, $maxheight);
 109         if (!$filedata) {
 110             send_file_not_found();
 111         }
 112
 113         // If we don't want to cached the file, serve now and quit.
 114         if (!$lifetime) {
 115             send_content_uncached($filedata, $filename);
 116         }
 117
 118         // Save, serve and quit.
 119         file_safe_save_content($filedata, $candidate);
 120         send_file($candidate, $filename, $lifetime, 0, false, false, '', false, $options);
 121     }
 122
 123     send_file_not_found();
 124 }