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wp-content/plugins/debloat/inc/file-cache.php

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+<?php
+
+namespace Sphere\Debloat;
+
+/**
+ * Filesystem based cache for assets.
+ * 
+ * @author  asadkn
+ * @since   1.0.0
+ */
+class FileCache
+{
+	/**
+	 * @var Filesystem
+	 */
+	protected $fs;
+	public $cache_path;
+	public $cache_url;
+
+	public function __construct()
+	{
+		$this->fs = Plugin::file_system();
+		$this->cache_path = WP_CONTENT_DIR . '/cache/debloat/';
+		$this->cache_url  = WP_CONTENT_URL . '/cache/debloat/';
+	}
+
+	/**
+	 * Get a cached file path.
+	 *
+	 * @param string $id
+	 * @return bool
+	 */
+	public function get($id) 
+	{
+		$file = $this->get_file_name($id);
+		if (!$file) {
+			return false;
+		}
+
+		$file = $this->get_cache_path($id) . $file;
+		if ($this->fs->is_file($file)) {
+			return $file;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get a cached file URL.
+	 *
+	 * @param string $id
+	 * @return bool|string 
+	 */
+	public function get_url($id)
+	{
+		if (!$this->get($id)) {
+			return false;
+		}
+
+		$file = $this->get_file_name($id);
+
+		if (!$file) {
+			return false;
+		}
+
+		return $this->cache_url . $this->get_cache_type($file) . '/' . $file;
+	}
+
+	/**
+	 * Get file name for cache storage/retrieval provided a URL or path.
+	 *
+	 * @param string $id  URL or path of a file.
+	 * @return string
+	 */
+	protected function get_file_name($id)
+	{
+		// Get a local path if a valid URL was provided. Remote URLs also work.
+		$file = $this->fs->url_to_local($id);
+		if (!$file) {
+			// Remote here.
+		}
+
+		// MD5 on the id instead of file, as it's likely to be a URL that can has a changing 
+		// query string reuqiring a new cached entry.
+		$hash = md5($id);
+		return $hash . '.' . $this->get_cache_type($file ?: $id);
+	}
+
+
+	/**
+	 * Save a file in the cache.
+	 *
+	 * @param string $id      Path, a local asset URL, or a unqiue name.
+	 * @param string $content
+	 * @return bool|string    File path on success or false on failure.
+	 */
+	public function set($id, string $content = '')
+	{
+		if (!$content) {
+			return false;
+		}
+		
+		// Ensure path exists.
+		$path = $this->get_cache_path($id);
+		$this->fs->mkdir_p($path);
+		
+		$file = $path . $this->get_file_name($id);
+		if ($this->fs->put_contents($file, $content)) {
+			return $file;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get cache path based on provided file path or id.
+	 *
+	 * @param string $asset A local path or a URL.
+	 * @return string
+	 */
+	public function get_cache_path($asset = '')
+	{
+		$path  = $this->cache_path;
+		$asset = $asset ? $this->fs->url_to_local($asset) : '';
+
+		// Path with asset type directory.
+		return $path . $this->get_cache_type($asset) . '/';
+	}
+
+	/**
+	 * Get the type of cache group based on file extension.
+	 *
+	 * @param string $id  File path or name. URLs fine too.
+	 * @return string
+	 */
+	protected function get_cache_type(string $file)
+	{
+		$extension = pathinfo($file, PATHINFO_EXTENSION);
+		$type = $extension === 'js' ? 'js' : 'css';
+
+		return $type;
+	}
+
+	/**
+	 * Delete all the cached files for specified cache.
+	 *
+	 * @param string $type
+	 * @return void
+	 */
+	public function delete_cache($type = 'js')
+	{
+		$dir   = $this->cache_path . $type . '/';
+		$files = (array) $this->fs->dirlist($dir);
+
+		foreach ($files as $file) {
+			$this->fs->delete($dir . $file['name']);
+		}
+	}
+
+	/**
+	 * Get number of files in cache for a specific type.
+	 *
+	 * @param string $type
+	 * @return integer
+	 */
+	public function get_stats($type = 'js')
+	{
+		$dir   = $this->cache_path . $type;
+		$files = $this->fs->dirlist($dir);
+
+		return $files ? count($files) : 0;
+	}
+}