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<?php
session_start();
/**
* Finds file in a database and shows its content.
*
* @copyright Copyright (c) 2017 Paulina Laura Emilia <vilene@posteo.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
require_once 'includes/database.inc.php';
// Seconds in one non-leap year
define('ONE_YEAR', 31536000);
/**
* Converts timestamp to HTTP-date format as defined by RFC 7231.
*
* @param int $timestamp
*
* @return string
*/
function httpDate($timestamp)
{
return gmdate('D, d M Y H:i:s T', $timestamp);
}
try {
// Get file from a database
$q = $db->prepare('SELECT filename, mime, size, date FROM files
WHERE filename = (:filename)');
$q->bindValue(':filename', $_GET['filename'], PDO::PARAM_STR);
if ($q->execute()) {
if ($q->rowCount() > 0) {
$file = $q->fetch(PDO::FETCH_OBJ);
// File metadata
header('Content-Length: ' . $file->size);
header('Content-Type: ' . $file->mime);
// Cache control
header('Cache-Control: public, immutable, max-age=' . ONE_YEAR);
header('Expires: ' . httpDate(time() + ONE_YEAR));
header('Last-Modified: ' . httpDate(strtotime($file->date)));
header('Pragma: public');
readfile(POMF_FILES_ROOT . $file->filename);
exit;
} else {
throw new Exception('File not found', 404);
}
} else {
$err = $q->errorInfo();
throw new Exception('SQL error: ' . $err[2], 500);
}
} catch (Exception $e) {
header('Content-Type: text/plain', true, $e->getCode());
echo $e->getCode() . ': ' . $e->getMessage();
exit;
}
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