79 lines
2.2 KiB
PHP
79 lines
2.2 KiB
PHP
<?php
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/*
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Copyright 2022 eraseyourknees
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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class UupDumpCache {
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private $cacheFile;
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private $isCompressed;
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private $newCacheVersion = 1;
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public function __construct($resource, $compressed = true) {
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$res = $resource."+cache_v".$this->newCacheVersion;
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$cacheHash = hash('sha256', strtolower($res));
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$ext = $compressed ? '.json.gz' : '.json';
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$this->cacheFile = 'cache/'.$cacheHash.$ext;
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$this->isCompressed = $compressed;
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}
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public function getFileName() {
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return $this->cacheFile;
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}
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public function delete() {
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@unlink($this->cacheFile);
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}
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public function get() {
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$cacheFile = $this->cacheFile;
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if(!file_exists($cacheFile)) {
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return false;
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}
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$cache = @file_get_contents($cacheFile);
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if($this->isCompressed) $cache = @gzdecode($cache);
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$cache = json_decode($cache, 1);
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$expires = $cache['expires'];
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$isExpired = ($expires !== false) && (time() > $expires);
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if(empty($cache['content']) || $isExpired) {
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$this->delete();
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return false;
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}
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return $cache['content'];
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}
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public function put($content, $validity) {
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$cacheFile = $this->cacheFile;
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$expires = $validity ? time() + $validity : false;
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$cache = array(
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'expires' => $expires,
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'content' => $content,
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);
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if(!file_exists('cache')) mkdir('cache');
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$cacheContent = json_encode($cache)."\n";
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if($this->isCompressed) $cacheContent = @gzencode($cache);
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@file_put_contents($cacheFile, $cacheContent);
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}
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}
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