SimpleCache.php

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<?php

namespace Elgg\Cache;

use Elgg\Config;
use Elgg\ViewsService;

class SimpleCache {

    protected $config;

    protected $views;

    public function __construct(
        Config $config,
        ViewsService $views
    ) {
        $this->config = $config;
        $this->views = $views;
    }

    public function getUrl($view, $subview = '') {
        // handle `getUrl('js', 'js/blog/save_draft')`
        if (($view === 'js' || $view === 'css') && 0 === strpos($subview, $view . '/')) {
            $view = $subview;
            $subview = '';
        }

        // handle `getUrl('js', 'blog/save_draft')`
        if (!empty($subview)) {
            $view = "$view/$subview";
        }

        $view = ViewsService::canonicalizeViewName($view);

        // should be normalized to canonical form by now: `getUrl('blog/save_draft.js')`
        $this->views->registerCacheableView($view);

        return $this->getRoot() . $view;
    }

    public function getRoot() {
        $viewtype = elgg_get_viewtype();
        if ($this->isEnabled()) {
            $lastcache = (int) $this->config->lastcache;
        } else {
            $lastcache = 0;
        }

        return elgg_normalize_url("/cache/$lastcache/$viewtype/");
    }

    public function isEnabled() {
        return (bool) $this->config->simplecache_enabled;
    }

    public function enable() {
        $this->config->save('simplecache_enabled', 1);
        $this->invalidate();
    }

    public function disable() {
        if ($this->config->simplecache_enabled) {
            $this->config->save('simplecache_enabled', 0);

            $this->invalidate();
        }
    }

    private function getPath() {
        return $this->config->assetroot;
    }

    public function invalidate() {
        _elgg_rmdir($this->getPath(), true);

        $time = time();
        $this->config->save("simplecache_lastupdate", $time);
        $this->config->lastcache = $time;

        return true;
    }
}