/lib/filebrowser/file_info_context_module.php
PHP | 347 lines | 179 code | 39 blank | 129 comment | 38 complexity | ada7bf2f3a2b9517146ea8f05ce7a0f7 MD5 | raw file
- <?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/>.
- /**
- * Utility class for browsing of module files.
- *
- * @package core_files
- * @copyright 2008 Petr Skoda (http://skodak.org)
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- defined('MOODLE_INTERNAL') || die();
- /**
- * Represents a module context in the tree navigated by {@link file_browser}.
- *
- * @package core_files
- * @copyright 2008 Petr Skoda (http://skodak.org)
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
- class file_info_context_module extends file_info {
- /** @var stdClass Course object */
- protected $course;
- /** @var cm_info Course module object */
- protected $cm;
- /** @var string Module name */
- protected $modname;
- /** @var array Available file areas */
- protected $areas;
- /** @var array caches the result of last call to get_non_empty_children() */
- protected $nonemptychildren;
- /**
- * Constructor
- *
- * @param file_browser $browser file browser instance
- * @param stdClass $context context object
- * @param stdClass $course course object
- * @param stdClass $cm course module object
- * @param string $modname module name
- */
- public function __construct($browser, $context, $course, $cm, $modname) {
- global $CFG;
- parent::__construct($browser, $context);
- $this->course = $course;
- $this->cm = cm_info::create($cm);
- $this->modname = $this->cm->modname;
- $this->nonemptychildren = null;
- if ($functionname = component_callback_exists('mod_'.$modname, 'get_file_areas')) {
- $cm = $this->cm->get_course_module_record();
- $this->areas = $functionname($course, $cm, $context);
- } else {
- $this->areas = array();
- }
- unset($this->areas['intro']); // hardcoded, ignore attempts to override it
- }
- /**
- * Return information about this specific context level
- *
- * @param string $component component
- * @param string $filearea file area
- * @param int $itemid item ID
- * @param string $filepath file path
- * @param string $filename file name
- * @return file_info|null
- */
- public function get_file_info($component, $filearea, $itemid, $filepath, $filename) {
- // try to emulate require_login() tests here
- if (!isloggedin()) {
- return null;
- }
- $coursecontext = $this->context->get_course_context(true);
- if (!$this->course->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
- return null;
- }
- if (!is_viewing($this->context) and !$this->browser->is_enrolled($this->course->id)) {
- // no peaking here if not enrolled or inspector
- return null;
- }
- if (!$this->cm->uservisible) {
- // activity hidden sorry
- return null;
- }
- if (empty($component)) {
- return $this;
- }
- if ($component == 'mod_'.$this->modname and $filearea === 'intro') {
- return $this->get_area_intro($itemid, $filepath, $filename);
- } else if ($component == 'backup' and $filearea === 'activity') {
- return $this->get_area_backup($itemid, $filepath, $filename);
- }
- if ($functionname = component_callback_exists('mod_'.$this->modname, 'get_file_info')) {
- $cm = $this->cm->get_course_module_record();
- return $functionname($this->browser, $this->areas, $this->course, $cm,
- $this->context, $filearea, $itemid, $filepath, $filename);
- }
- return null;
- }
- /**
- * Get a file from module intro area
- *
- * @param int $itemid item ID
- * @param string $filepath file path
- * @param string $filename file name
- * @return file_info|null
- */
- protected function get_area_intro($itemid, $filepath, $filename) {
- global $CFG;
- if (!plugin_supports('mod', $this->modname, FEATURE_MOD_INTRO, true) or !has_capability('moodle/course:managefiles', $this->context)) {
- return null;
- }
- $fs = get_file_storage();
- $filepath = is_null($filepath) ? '/' : $filepath;
- $filename = is_null($filename) ? '.' : $filename;
- if (!$storedfile = $fs->get_file($this->context->id, 'mod_'.$this->modname, 'intro', 0, $filepath, $filename)) {
- if ($filepath === '/' and $filename === '.') {
- $storedfile = new virtual_root_file($this->context->id, 'mod_'.$this->modname, 'intro', 0);
- } else {
- // not found
- return null;
- }
- }
- $urlbase = $CFG->wwwroot.'/pluginfile.php';
- return new file_info_stored($this->browser, $this->context, $storedfile, $urlbase, get_string('moduleintro'), false, true, true, false);
- }
- /**
- * Get a file from module backup area
- *
- * @param int $itemid item ID
- * @param string $filepath file path
- * @param string $filename file name
- * @return file_info|null
- */
- protected function get_area_backup($itemid, $filepath, $filename) {
- global $CFG;
- if (!has_capability('moodle/backup:backupactivity', $this->context)) {
- return null;
- }
- $fs = get_file_storage();
- $filepath = is_null($filepath) ? '/' : $filepath;
- $filename = is_null($filename) ? '.' : $filename;
- if (!$storedfile = $fs->get_file($this->context->id, 'backup', 'activity', 0, $filepath, $filename)) {
- if ($filepath === '/' and $filename === '.') {
- $storedfile = new virtual_root_file($this->context->id, 'backup', 'activity', 0);
- } else {
- // not found
- return null;
- }
- }
- $downloadable = has_capability('moodle/backup:downloadfile', $this->context);
- $uploadable = has_capability('moodle/restore:uploadfile', $this->context);
- $urlbase = $CFG->wwwroot.'/pluginfile.php';
- return new file_info_stored($this->browser, $this->context, $storedfile, $urlbase, get_string('activitybackup', 'repository'), false, $downloadable, $uploadable, false);
- }
- /**
- * Returns localised visible name.
- *
- * @return string
- */
- public function get_visible_name() {
- return $this->cm->get_formatted_name().' ('.$this->cm->get_module_type_name().')';
- }
- /**
- * Whether or not files or directories can be added
- *
- * @return bool
- */
- public function is_writable() {
- return false;
- }
- /**
- * Whether or not this is an emtpy area
- *
- * @return bool
- */
- public function is_empty_area() {
- if ($child = $this->get_area_backup(0, '/', '.')) {
- if (!$child->is_empty_area()) {
- return false;
- }
- }
- if ($child = $this->get_area_intro(0, '/', '.')) {
- if (!$child->is_empty_area()) {
- return false;
- }
- }
- foreach ($this->areas as $area=>$desctiption) {
- if ($child = $this->get_file_info('mod_'.$this->modname, $area, null, null, null)) {
- if (!$child->is_empty_area()) {
- return false;
- }
- }
- }
- return true;
- }
- /**
- * Whether or not this is a directory
- *
- * @return bool
- */
- public function is_directory() {
- return true;
- }
- /**
- * Returns list of children.
- *
- * @return array of file_info instances
- */
- public function get_children() {
- return $this->get_filtered_children('*', false, true);
- }
- /**
- * Help function to return files matching extensions or their count
- *
- * @param string|array $extensions, either '*' or array of lowercase extensions, i.e. array('.gif','.jpg')
- * @param bool|int $countonly if false returns the children, if an int returns just the
- * count of children but stops counting when $countonly number of children is reached
- * @param bool $returnemptyfolders if true returns items that don't have matching files inside
- * @return array|int array of file_info instances or the count
- */
- private function get_filtered_children($extensions = '*', $countonly = false, $returnemptyfolders = false) {
- global $DB;
- // prepare list of areas including intro and backup
- $areas = array(
- array('mod_'.$this->modname, 'intro'),
- array('backup', 'activity')
- );
- foreach ($this->areas as $area => $desctiption) {
- $areas[] = array('mod_'.$this->modname, $area);
- }
- $params1 = array('contextid' => $this->context->id, 'emptyfilename' => '.');
- list($sql2, $params2) = $this->build_search_files_sql($extensions);
- $children = array();
- foreach ($areas as $area) {
- if (!$returnemptyfolders) {
- // fast pre-check if there are any files in the filearea
- $params1['component'] = $area[0];
- $params1['filearea'] = $area[1];
- if (!$DB->record_exists_sql('SELECT 1 from {files}
- WHERE contextid = :contextid
- AND filename <> :emptyfilename
- AND component = :component
- AND filearea = :filearea '.$sql2,
- array_merge($params1, $params2))) {
- continue;
- }
- }
- if ($child = $this->get_file_info($area[0], $area[1], null, null, null)) {
- if ($returnemptyfolders || $child->count_non_empty_children($extensions)) {
- $children[] = $child;
- if ($countonly !== false && count($children) >= $countonly) {
- break;
- }
- }
- }
- }
- if ($countonly !== false) {
- return count($children);
- }
- return $children;
- }
- /**
- * Returns list of children which are either files matching the specified extensions
- * or folders that contain at least one such file.
- *
- * @param string|array $extensions either '*' or array of lowercase extensions, i.e. array('.gif','.jpg')
- * @return array of file_info instances
- */
- public function get_non_empty_children($extensions = '*') {
- if ($this->nonemptychildren !== null) {
- return $this->nonemptychildren;
- }
- $this->nonemptychildren = $this->get_filtered_children($extensions);
- return $this->nonemptychildren;
- }
- /**
- * Returns the number of children which are either files matching the specified extensions
- * or folders containing at least one such file.
- *
- * @param string|array $extensions for example '*' or array('.gif','.jpg')
- * @param int $limit stop counting after at least $limit non-empty children are found
- * @return int
- */
- public function count_non_empty_children($extensions = '*', $limit = 1) {
- if ($this->nonemptychildren !== null) {
- return count($this->nonemptychildren);
- }
- return $this->get_filtered_children($extensions, $limit);
- }
- /**
- * Returns parent file_info instance
- *
- * @return file_info|null file_info or null for root
- */
- public function get_parent() {
- $parent = $this->context->get_parent_context();
- return $this->browser->get_file_info($parent);
- }
- }