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 }