63 lines
1.6 KiB
PHP
63 lines
1.6 KiB
PHP
<?php
|
|
/**
|
|
* Simple cache system, mainly for the RSS/ATOM feeds
|
|
*/
|
|
class CachedPage
|
|
{
|
|
// Directory containing page caches
|
|
private $cacheDir;
|
|
|
|
// Full URL of the page to cache -typically the value returned by pageUrl()
|
|
private $url;
|
|
|
|
// Should this URL be cached (boolean)?
|
|
private $shouldBeCached;
|
|
|
|
// Name of the cache file for this URL
|
|
private $filename;
|
|
|
|
/**
|
|
* Creates a new CachedPage
|
|
*
|
|
* @param string $cacheDir page cache directory
|
|
* @param string $url page URL
|
|
* @param bool $shouldBeCached whether this page needs to be cached
|
|
*/
|
|
public function __construct($cacheDir, $url, $shouldBeCached)
|
|
{
|
|
// TODO: check write access to the cache directory
|
|
$this->cacheDir = $cacheDir;
|
|
$this->url = $url;
|
|
$this->filename = $this->cacheDir.'/'.sha1($url).'.cache';
|
|
$this->shouldBeCached = $shouldBeCached;
|
|
}
|
|
|
|
/**
|
|
* Returns the cached version of a page, if it exists and should be cached
|
|
*
|
|
* @return string a cached version of the page if it exists, null otherwise
|
|
*/
|
|
public function cachedVersion()
|
|
{
|
|
if (!$this->shouldBeCached) {
|
|
return null;
|
|
}
|
|
if (is_file($this->filename)) {
|
|
return file_get_contents($this->filename);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|