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Avoid using global variables
[github/shaarli/Shaarli.git] / application / render / PageCacheManager.php
1 <?php
2
3 namespace Shaarli\Render;
4
5 use Shaarli\Feed\CachedPage;
6
7 /**
8 * Cache utilities
9 */
10 class PageCacheManager
11 {
12 /** @var string Cache directory */
13 protected $pageCacheDir;
14
15 /** @var bool */
16 protected $isLoggedIn;
17
18 public function __construct(string $pageCacheDir, bool $isLoggedIn)
19 {
20 $this->pageCacheDir = $pageCacheDir;
21 $this->isLoggedIn = $isLoggedIn;
22 }
23
24 /**
25 * Purges all cached pages
26 *
27 * @return string|null an error string if the directory is missing
28 */
29 public function purgeCachedPages(): ?string
30 {
31 if (!is_dir($this->pageCacheDir)) {
32 $error = sprintf(t('Cannot purge %s: no directory'), $this->pageCacheDir);
33 error_log($error);
34
35 return $error;
36 }
37
38 array_map('unlink', glob($this->pageCacheDir . '/*.cache'));
39
40 return null;
41 }
42
43 /**
44 * Invalidates caches when the database is changed or the user logs out.
45 */
46 public function invalidateCaches(): void
47 {
48 // Purge page cache shared by sessions.
49 $this->purgeCachedPages();
50 }
51
52 public function getCachePage(string $pageUrl): CachedPage
53 {
54 return new CachedPage(
55 $this->pageCacheDir,
56 $pageUrl,
57 false === $this->isLoggedIn
58 );
59 }
60 }