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  • // This file is part of Stack - http://stack.maths.ed.ac.uk/
    
    //
    // Stack 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.
    //
    // Stack 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 Stack.  If not, see <http://www.gnu.org/licenses/>.
    
    /**
     * This script serves plot files that have been saved in the moodledata folder.
     *
     * @copyright  2012 The Open University
     * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
     */
    
    
    require_once(__DIR__ . '/../../../config.php');
    
    require_once($CFG->libdir . '/filelib.php');
    
    
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    require_login();
    
    
    $filename = clean_filename(get_file_argument());
    $filenamesplit = explode('.', $filename);
    $filetype = end($filenamesplit);
    
    $permittedtypes = array('png' => true, 'svg' => true);
    if (!array_key_exists($filetype, $permittedtypes)) {
        header('HTTP/1.0 404 Not Found');
        header('Content-Type: text/plain;charset=UTF-8');
        echo 'Filetype not supported';
    }
    
    $plot = $CFG->dataroot . '/stack/plots/' . $filename;
    
    
    if (!is_readable($plot)) {
        header('HTTP/1.0 404 Not Found');
        header('Content-Type: text/plain;charset=UTF-8');
        echo 'File not found';
        die();
    }
    
    
    // Handle If-Modified-Since.
    
    $filedate = filemtime($plot);
    if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
            strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $filedate) {
        header('HTTP/1.0 304 Not Modified');
        die();
    }
    header('Last-Modified: '.gmdate('D, d M Y H:i:s', $filedate).' GMT');
    
    
    // Type.
    
    header('Content-Type: ' . mimeinfo('type', 'x.'.$filetype));
    
    header('Content-Length: ' . filesize($plot));
    
    
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    // Unlock session during file serving.
    if (class_exists('\core\session\manager')) {
        // Moodle >= 2.6.
        \core\session\manager::write_close();
    } else {
        // Moodle < 2.6.
        session_get_instance()->write_close();
    }
    
    
    // Output file.
    
    readfile($plot);