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