lib/filebrowser/file_info_context_module.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 /**
  20  * Utility class for browsing of module files.
  21  *
  22  * @package    core
  23  * @subpackage filebrowser
  24  * @copyright  2008 Petr Skoda (http://skodak.org)
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28 defined('MOODLE_INTERNAL') || die();
  29
  30 /**
  31  * Represents a module context in the tree navigated by @see{file_browser}.
  32  *
  33  * @package    core
  34  * @subpackage filebrowser
  35  * @copyright  2008 Petr Skoda (http://skodak.org)
  36  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  37  */
  38 class file_info_context_module extends file_info {
  39     protected $course;
  40     protected $cm;
  41     protected $modname;
  42     protected $areas;
  43
  44     public function __construct($browser, $context, $course, $cm, $modname) {
  45         global $CFG;
  46
  47         parent::__construct($browser, $context);
  48         $this->course  = $course;
  49         $this->cm      = $cm;
  50         $this->modname = $modname;
  51
  52         include_once("$CFG->dirroot/mod/$modname/lib.php");
  53
  54         //find out all supported areas
  55         $functionname     = 'mod_'.$modname.'_get_file_areas';
  56         $functionname_old = $modname.'_get_file_areas';
  57
  58         if (function_exists($functionname)) {
  59             $this->areas = $functionname($course, $cm, $context);
  60         } else if (function_exists($functionname_old)) {
  61             $this->areas = $functionname_old($course, $cm, $context);
  62         } else {
  63             $this->areas = array();
  64         }
  65         unset($this->areas['intro']); // hardcoded, ignore attempts to override it
  66     }
  67
  68     /**
  69      * Return information about this specific context level
  70      *
  71      * @param $component
  72      * @param $filearea
  73      * @param $itemid
  74      * @param $filepath
  75      * @param $filename
  76      */
  77     public function get_file_info($component, $filearea, $itemid, $filepath, $filename) {
  78         // try to emulate require_login() tests here
  79         if (!isloggedin()) {
  80             return null;
  81         }
  82
  83         $coursecontext = get_course_context($this->context);
  84         if (!$this->course->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
  85             return null;
  86         }
  87
  88         if (!is_viewing($this->context) and !is_enrolled($this->context)) {
  89             // no peaking here if not enrolled or inspector
  90             return null;
  91         }
  92
  93         $modinfo = get_fast_modinfo($this->course);
  94         $cminfo = $modinfo->get_cm($this->cm->id);
  95         if (!$cminfo->uservisible) {
  96             // activity hidden sorry
  97             return null;
  98         }
  99
 100         if (empty($component)) {
 101             return $this;
 102         }
 103
 104         if ($component == 'mod_'.$this->modname and $filearea === 'intro') {
 105             return $this->get_area_intro($itemid, $filepath, $filename);
 106         } else if ($component == 'backup' and $filearea === 'activity') {
 107             return $this->get_area_backup($itemid, $filepath, $filename);
 108         }
 109
 110         $functionname     = 'mod_'.$this->modname.'_get_file_info';
 111         $functionname_old = $this->modname.'_get_file_info';
 112
 113         if (function_exists($functionname)) {
 114             return $functionname($this->browser, $this->areas, $this->course, $this->cm, $this->context, $filearea, $itemid, $filepath, $filename);
 115         } else if (function_exists($functionname_old)) {
 116             return $functionname_old($this->browser, $this->areas, $this->course, $this->cm, $this->context, $filearea, $itemid, $filepath, $filename);
 117         }
 118
 119         return null;
 120     }
 121
 122     protected function get_area_intro($itemid, $filepath, $filename) {
 123         global $CFG;
 124
 125         if (!plugin_supports('mod', $this->modname, FEATURE_MOD_INTRO, true) or !has_capability('moodle/course:managefiles', $this->context)) {
 126             return null;
 127         }
 128
 129         $fs = get_file_storage();
 130
 131         $filepath = is_null($filepath) ? '/' : $filepath;
 132         $filename = is_null($filename) ? '.' : $filename;
 133         if (!$storedfile = $fs->get_file($this->context->id, 'mod_'.$this->modname, 'intro', 0, $filepath, $filename)) {
 134             if ($filepath === '/' and $filename === '.') {
 135                 $storedfile = new virtual_root_file($this->context->id, 'mod_'.$this->modname, 'intro', 0);
 136             } else {
 137                 // not found
 138                 return null;
 139             }
 140         }
 141
 142         $urlbase = $CFG->wwwroot.'/pluginfile.php';
 143         return new file_info_stored($this->browser, $this->context, $storedfile, $urlbase, get_string('moduleintro'), false, true, true, false);
 144     }
 145
 146     protected function get_area_backup($itemid, $filepath, $filename) {
 147         global $CFG;
 148
 149         if (!has_capability('moodle/backup:backupactivity', $this->context)) {
 150             return null;
 151         }
 152
 153         $fs = get_file_storage();
 154
 155         $filepath = is_null($filepath) ? '/' : $filepath;
 156         $filename = is_null($filename) ? '.' : $filename;
 157         if (!$storedfile = $fs->get_file($this->context->id, 'backup', 'activity', 0, $filepath, $filename)) {
 158             if ($filepath === '/' and $filename === '.') {
 159                 $storedfile = new virtual_root_file($this->context->id, 'backup', 'activity', 0);
 160             } else {
 161                 // not found
 162                 return null;
 163             }
 164         }
 165
 166         $downloadable = has_capability('moodle/backup:downloadfile', $this->context);
 167         $uploadable   = has_capability('moodle/restore:uploadfile', $this->context);
 168
 169         $urlbase = $CFG->wwwroot.'/pluginfile.php';
 170         return new file_info_stored($this->browser, $this->context, $storedfile, $urlbase, get_string('activitybackup', 'repository'), false, $downloadable, $uploadable, false);
 171     }
 172
 173     /**
 174      * Returns localised visible name.
 175      * @return string
 176      */
 177     public function get_visible_name() {
 178         return $this->cm->name.' ('.get_string('modulename', $this->cm->modname).')';
 179     }
 180
 181     /**
 182      * Can I add new files or directories?
 183      * @return bool
 184      */
 185     public function is_writable() {
 186         return false;
 187     }
 188
 189     /**
 190      * Is this empty area?
 191      *
 192      * @return bool
 193      */
 194     public function is_empty_area() {
 195         if ($child = $this->get_area_backup(0, '/', '.')) {
 196             if (!$child->is_empty_area()) {
 197                 return false;
 198             }
 199         }
 200         if ($child = $this->get_area_intro(0, '/', '.')) {
 201             if (!$child->is_empty_area()) {
 202                 return false;
 203             }
 204         }
 205
 206         foreach ($this->areas as $area=>$desctiption) {
 207             if ($child = $this->get_file_info('mod_'.$this->modname, $area, null, null, null)) {
 208                 if (!$child->is_empty_area()) {
 209                     return false;
 210                 }
 211             }
 212         }
 213
 214         return true;
 215     }
 216
 217     /**
 218      * Is directory?
 219      * @return bool
 220      */
 221     public function is_directory() {
 222         return true;
 223     }
 224
 225     /**
 226      * Returns list of children.
 227      * @return array of file_info instances
 228      */
 229     public function get_children() {
 230         $children = array();
 231
 232         if ($child = $this->get_area_backup(0, '/', '.')) {
 233             $children[] = $child;
 234         }
 235         if ($child = $this->get_area_intro(0, '/', '.')) {
 236             $children[] = $child;
 237         }
 238
 239         foreach ($this->areas as $area=>$desctiption) {
 240             if ($child = $this->get_file_info('mod_'.$this->modname, $area, null, null, null)) {
 241                 $children[] = $child;
 242             }
 243         }
 244
 245         return $children;
 246     }
 247
 248     /**
 249      * Returns parent file_info instance
 250      * @return file_info or null for root
 251      */
 252     public function get_parent() {
 253         $pcid = get_parent_contextid($this->context);
 254         $parent = get_context_instance_by_id($pcid);
 255         return $this->browser->get_file_info($parent);
 256     }
 257 }