leilukin-tumbleblog/includes/thumbnail.php

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PHP
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2024-06-20 14:10:42 +00:00
<?php
/**
* File: thumbnail
* Serves compressed image thumbnails for uploaded files.
*/
define('USE_ZLIB', false);
require_once "common.php";
$trigger->call("serve_thumbnail");
set_max_memory();
if (empty($_GET['file']))
error(
__("Error"),
__("Missing argument."),
code:400
);
if (!$visitor->group->can("view_site"))
show_403(
__("Access Denied"),
__("You are not allowed to view this site.")
);
$quality = abs((int) fallback($_GET["quality"], 80));
$filename = str_replace(array(DIR, "/"), "", $_GET['file']);
if ($filename == "")
show_404(
__("Not Found"),
__("File not found.")
);
$filepath = uploaded($filename, false);
$thumb_w = abs((int) fallback($_GET["max_width"], 960));
$thumb_h = abs((int) fallback($_GET["max_height"], 0));
if (!is_readable($filepath) or !is_file($filepath))
show_404(
__("Not Found"),
__("File not found.")
);
# Halve the quality if reduced data usage is preferred.
if (isset($_SERVER['HTTP_SAVE_DATA'])) {
if (!preg_match("/^(off|0)$/i", $_SERVER['HTTP_SAVE_DATA']))
$quality = floor($quality * 0.5);
}
$thumb = new ThumbnailFile(
$filename,
$thumb_w,
$thumb_h,
$quality,
!empty($_GET['square'])
);
# Redirect to original if thumbnail cannot or should not be created.
if (!$thumb->creatable() or $thumb->upscaling()) {
header("Cache-Control: public");
header("Pragma: no-cache");
header("Expires: ".date("r", now("+7 days")));
redirect(uploaded($filename), code:301);
}
# Respond to If-Modified-Since so the user agent will use cache.
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$lastmod = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
if ($lastmod >= filemtime($filepath)) {
header_remove();
header($_SERVER['SERVER_PROTOCOL']." 304 Not Modified");
header("Cache-Control: public");
header("Pragma: no-cache");
header("Expires: ".date("r", now("+30 days")));
header("Vary: Accept-Encoding, Cookie, Save-Data");
exit;
}
}
$safename = addslashes($thumb->name());
header("Last-Modified: ".date("r", filemtime($filepath)));
header("Cache-Control: public");
header("Pragma: no-cache");
header("Expires: ".date("r", now("+30 days")));
header("Content-Disposition: inline; filename=\"".$safename."\"");
$thumb->create();
$thumb->serve();
$trigger->call("end");
ob_end_flush();