f00600a283
Currently the cache is only invalidated when the datastore changes, while it should rely on selected period of time. Fixes #1659
81 lines
2.2 KiB
PHP
81 lines
2.2 KiB
PHP
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
namespace Shaarli\Feed;
|
|
|
|
use DatePeriod;
|
|
|
|
/**
|
|
* Simple cache system, mainly for the RSS/ATOM feeds
|
|
*/
|
|
class CachedPage
|
|
{
|
|
/** Directory containing page caches */
|
|
protected $cacheDir;
|
|
|
|
/** Should this URL be cached (boolean)? */
|
|
protected $shouldBeCached;
|
|
|
|
/** Name of the cache file for this URL */
|
|
protected $filename;
|
|
|
|
/** @var DatePeriod|null Optionally specify a period of time for cache validity */
|
|
protected $validityPeriod;
|
|
|
|
/**
|
|
* Creates a new CachedPage
|
|
*
|
|
* @param string $cacheDir page cache directory
|
|
* @param string $url page URL
|
|
* @param bool $shouldBeCached whether this page needs to be cached
|
|
* @param ?DatePeriod $validityPeriod Optionally specify a time limit on requested cache
|
|
*/
|
|
public function __construct($cacheDir, $url, $shouldBeCached, ?DatePeriod $validityPeriod)
|
|
{
|
|
// TODO: check write access to the cache directory
|
|
$this->cacheDir = $cacheDir;
|
|
$this->filename = $this->cacheDir . '/' . sha1($url) . '.cache';
|
|
$this->shouldBeCached = $shouldBeCached;
|
|
$this->validityPeriod = $validityPeriod;
|
|
}
|
|
|
|
/**
|
|
* Returns the cached version of a page, if it exists and should be cached
|
|
*
|
|
* @return string a cached version of the page if it exists, null otherwise
|
|
*/
|
|
public function cachedVersion()
|
|
{
|
|
if (!$this->shouldBeCached) {
|
|
return null;
|
|
}
|
|
if (!is_file($this->filename)) {
|
|
return null;
|
|
}
|
|
if ($this->validityPeriod !== null) {
|
|
$cacheDate = \DateTime::createFromFormat('U', (string) filemtime($this->filename));
|
|
if (
|
|
$cacheDate < $this->validityPeriod->getStartDate()
|
|
|| $cacheDate > $this->validityPeriod->getEndDate()
|
|
) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return file_get_contents($this->filename);
|
|
}
|
|
|
|
/**
|
|
* Puts a page in the cache
|
|
*
|
|
* @param string $pageContent XML content to cache
|
|
*/
|
|
public function cache($pageContent)
|
|
{
|
|
if (!$this->shouldBeCached) {
|
|
return;
|
|
}
|
|
file_put_contents($this->filename, $pageContent);
|
|
}
|
|
}
|