フォーク元 tak4/bibis
36 行
1005 B
PHP
36 行
1005 B
PHP
<?php
|
|
require_once(__DIR__ . '/../../require.php');
|
|
|
|
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
|
|
if (!ENABLE_ATTACHMENT) { return on_error(404, ['Not Found.']); }
|
|
|
|
$id = $_GET['id'] ?? '';
|
|
if ($id == '' || !preg_match('/^[a-z0-9]{32}$/', $id)) { return on_error(400, ['URLが不正。']); }
|
|
|
|
$filepath = ATTACHMENT_DIR . $id . '.gz';
|
|
if (!file_exists($filepath)) { return on_error(404, ['Not Found.']); }
|
|
|
|
ob_start();
|
|
readgzfile($filepath);
|
|
$buffer = ob_get_clean();
|
|
$type = get_image_type($buffer);
|
|
if (!isset($type)) { return on_error(500, ['ファイルが不正。']); }
|
|
|
|
$php_time = filemtime(__FILE__);
|
|
$attachment_time = filemtime($filepath);
|
|
$etag = '"' . $php_time . '.' . $attachment_time . '"';
|
|
|
|
header('Cache-Control: max-age=86400');
|
|
header("ETag: {$etag}");
|
|
|
|
if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
|
|
if ($_SERVER['HTTP_IF_NONE_MATCH'] === $etag) {
|
|
header('HTTP/1.1 304 Not Modified', true, 304);
|
|
exit();
|
|
}
|
|
}
|
|
|
|
header("Content-Type: {$type}");
|
|
echo $buffer;
|
|
}
|