mirror of
https://github.com/mosbth/cimage.git
synced 2025-07-30 21:20:11 +02:00
92 lines
2.5 KiB
PHP
92 lines
2.5 KiB
PHP
<?php
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/**
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* Fast track cache, read entries from the cache before processing image
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* the ordinary way.
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*/
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// Load the config file or use defaults
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$configFile = __DIR__
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. "/"
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. basename(__FILE__, ".php")
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. "_config.php";
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if (is_file($configFile) && is_readable($configFile)) {
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$config = require $configFile;
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} elseif (!isset($config)) {
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$config = array(
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"fast_track_allow" => true,
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"autoloader" => __DIR__ . "/../autoload.php",
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"cache_path" => __DIR__ . "/../cache/",
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);
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}
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// Make CIMAGE_DEBUG false by default, if not already defined
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if (!defined("CIMAGE_DEBUG")) {
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define("CIMAGE_DEBUG", false);
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}
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// Debug mode needs additional functions
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if (CIMAGE_DEBUG) {
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require $config["autoloader"];
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}
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// Cache path must be valid
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$cacheIsReadable = is_dir($config["cache_path"]) && is_readable($config["cache_path"]);
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if (!$cacheIsReadable) {
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die("imgf.php: Cache is not readable, check path in configfile.");
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}
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// Prepare to check if fast cache should be used
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$cachePath = $config["cache_path"] . "/fasttrack";
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$query = $_GET;
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// Do not use cache when no-cache is active
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$useCache = !(array_key_exists("no-cache", $query) || array_key_exists("nc", $query));
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// Only use cache if enabled by configuration
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$useCache = $useCache && isset($config["fast_track_allow"]) && $config["fast_track_allow"] === true;
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// Remove parts from querystring that should not be part of filename
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$clear = array("nc", "no-cache");
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foreach ($clear as $value) {
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unset($query[$value]);
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}
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// Create the cache filename
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arsort($query);
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$queryAsString = http_build_query($query);
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$filename = md5($queryAsString);
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$filename = "$cachePath/$filename";
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// Check cached item, if any
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if ($useCache && is_readable($filename)) {
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$item = json_decode(file_get_contents($filename), true);
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if (is_readable($item["source"])) {
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foreach ($item["header"] as $value) {
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header($value);
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}
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if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])
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&& strtotime($_SERVER["HTTP_IF_MODIFIED_SINCE"]) == $item["last-modified"]) {
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header("HTTP/1.0 304 Not Modified");
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if (CIMAGE_DEBUG) {
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trace("imgf 304");
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}
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exit;
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}
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foreach ($item["header-output"] as $value) {
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header($value);
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}
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if (CIMAGE_DEBUG) {
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trace("imgf 200");
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}
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readfile($item["source"]);
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exit;
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}
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}
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// No fast track cache, proceed as usual
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include __DIR__ . "/img.php";
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