C:/xampp/htdocs/moodle/lib/filebrowser/file_browser.php

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<?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/>.


defined('MOODLE_INTERNAL') || die();

require_once("$CFG->libdir/filebrowser/file_info.php");

// general area types
require_once("$CFG->libdir/filebrowser/file_info_stored.php");
require_once("$CFG->libdir/filebrowser/virtual_root_file.php");

// description of available areas in each context level
require_once("$CFG->libdir/filebrowser/file_info_context_system.php");
require_once("$CFG->libdir/filebrowser/file_info_context_user.php");
require_once("$CFG->libdir/filebrowser/file_info_context_coursecat.php");
require_once("$CFG->libdir/filebrowser/file_info_context_course.php");
require_once("$CFG->libdir/filebrowser/file_info_context_module.php");

class file_browser {

    public function get_file_info($context = NULL, $component = NULL, $filearea = NULL, $itemid = NULL, $filepath = NULL, $filename = NULL) {
        if (!$context) {
            $context = get_context_instance(CONTEXT_SYSTEM);
        }
        switch ($context->contextlevel) {
            case CONTEXT_SYSTEM:
                return $this->get_file_info_context_system($context, $component, $filearea, $itemid, $filepath, $filename);
            case CONTEXT_USER:
                return $this->get_file_info_context_user($context, $component, $filearea, $itemid, $filepath, $filename);
            case CONTEXT_COURSECAT:
                return $this->get_file_info_context_coursecat($context, $component, $filearea, $itemid, $filepath, $filename);
            case CONTEXT_COURSE:
                return $this->get_file_info_context_course($context, $component, $filearea, $itemid, $filepath, $filename);
            case CONTEXT_MODULE:
                return $this->get_file_info_context_module($context, $component, $filearea, $itemid, $filepath, $filename);
        }

        return null;
    }

    private function get_file_info_context_system($context, $component, $filearea, $itemid, $filepath, $filename) {
        $level = new file_info_context_system($this, $context);
        return $level->get_file_info($component, $filearea, $itemid, $filepath, $filename);
        // nothing supported at this context yet
    }

    private function get_file_info_context_user($context, $component, $filearea, $itemid, $filepath, $filename) {
        global $DB, $USER;
        if ($context->instanceid == $USER->id) {
            $user = $USER;
        } else {
            $user = $DB->get_record('user', array('id'=>$context->instanceid));
        }

        if (isguestuser($user)) {
            // guests do not have any files
            return null;
        }

        if ($user->deleted) {
            return null;
        }

        $level = new file_info_context_user($this, $context, $user);
        return $level->get_file_info($component, $filearea, $itemid, $filepath, $filename);
    }

    private function get_file_info_context_coursecat($context, $component, $filearea, $itemid, $filepath, $filename) {
        global $DB;

        if (!$category = $DB->get_record('course_categories', array('id'=>$context->instanceid))) {
            return null;
        }

        $level = new file_info_context_coursecat($this, $context, $category);
        return $level->get_file_info($component, $filearea, $itemid, $filepath, $filename);
    }

    private function get_file_info_context_course($context, $component, $filearea, $itemid, $filepath, $filename) {
        global $DB, $COURSE;

        if ($context->instanceid == $COURSE->id) {
            $course = $COURSE;
        } else if (!$course = $DB->get_record('course', array('id'=>$context->instanceid))) {
            return null;
        }

        $level = new file_info_context_course($this, $context, $course);
        return $level->get_file_info($component, $filearea, $itemid, $filepath, $filename);
    }

    private function get_file_info_context_module($context, $component, $filearea, $itemid, $filepath, $filename) {
        global $COURSE, $DB, $CFG;


        if (!$cm = get_coursemodule_from_id('', $context->instanceid)) {
            return null;
        }

        if ($cm->course == $COURSE->id) {
            $course = $COURSE;
        } else if (!$course = $DB->get_record('course', array('id'=>$cm->course))) {
            return null;
        }

        $modinfo = get_fast_modinfo($course);
        if (empty($modinfo->cms[$cm->id]->uservisible)) {
            return null;
        }

        $modname = $modinfo->cms[$cm->id]->modname;

        if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
            return null;
        }

        // ok, we know that module exists, and user may access it

        $level = new file_info_context_module($this, $context, $course, $cm, $modname);
        return $level->get_file_info($component, $filearea, $itemid, $filepath, $filename);
    }

}