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wp-content/plugins/jetpack-boost/app/lib/critical-css/class-critical-css-storage.php

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+<?php
+/**
+ * Critical CSS storage.
+ *
+ * @link       https://automattic.com
+ * @since      1.0.0
+ * @package    automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Lib\Critical_CSS;
+
+use Automattic\Jetpack_Boost\Lib\Storage_Post_Type;
+
+/**
+ * Critical CSS Storage class
+ */
+class Critical_CSS_Storage {
+
+	/**
+	 * Storage post type.
+	 *
+	 * @var Storage_Post_Type
+	 */
+	protected $storage;
+
+	/**
+	 * Critical_CSS_Storage constructor.
+	 */
+	public function __construct() {
+		$this->storage = new Storage_Post_Type( 'css' );
+	}
+
+	/**
+	 * Store Critical CSS for a specific provider.
+	 *
+	 * @param string $key   Provider key.
+	 * @param string $value Critical CSS.
+	 */
+	public function store_css( $key, $value ) {
+		$this->storage->set(
+			$key,
+			array(
+				'css' => $value,
+			)
+		);
+	}
+
+	/**
+	 * Clear the whole Critical CSS storage.
+	 */
+	public function clear() {
+		$this->storage->clear();
+	}
+
+	/**
+	 * Get Critical CSS for specific provider keys.
+	 *
+	 * @param array $provider_keys Provider keys.
+	 *
+	 * @return array|false
+	 */
+	public function get_css( $provider_keys ) {
+		foreach ( $provider_keys as $key ) {
+			$data = $this->storage->get( $key, false );
+			if ( $data && $data['css'] ) {
+				return array(
+					'key' => $key,
+					'css' => $data['css'],
+				);
+			}
+		}
+
+		return false;
+	}
+}