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msd2/wordpress/wp-content/plugins/wordpress-seo/admin/class-extension-manager.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin
+ */
+
+/**
+ * Represents the class that contains the available extensions for Yoast SEO.
+ */
+class WPSEO_Extension_Manager {
+
+	/**
+	 * The transient key to save the cache in.
+	 *
+	 * @var string
+	 */
+	const TRANSIENT_CACHE_KEY = 'wpseo_license_active_extensions';
+
+	/**
+	 * @var WPSEO_Extension[]
+	 */
+	protected $extensions = array();
+
+	/**
+	 * List of active plugins.
+	 *
+	 * @var array
+	 */
+	protected static $active_extensions;
+
+	/**
+	 * Adds an extension to the manager.
+	 *
+	 * @param string          $extension_name The extension name.
+	 * @param WPSEO_Extension $extension      The extension value object.
+	 *
+	 * @return void
+	 */
+	public function add( $extension_name, WPSEO_Extension $extension = null ) {
+		$this->extensions[ $extension_name ] = $extension;
+	}
+
+	/**
+	 * Removes an extension from the manager.
+	 *
+	 * @param string $extension_name The name of the extension to remove.
+	 *
+	 * @return void
+	 */
+	public function remove( $extension_name ) {
+		if ( array_key_exists( $extension_name, $this->extensions ) ) {
+			unset( $this->extensions[ $extension_name ] );
+		}
+	}
+
+	/**
+	 * Returns the extension for the given extension name.
+	 *
+	 * @param string $extension_name The name of the extension to get.
+	 *
+	 * @return null|WPSEO_Extension The extension object or null when it doesn't exist.
+	 */
+	public function get( $extension_name ) {
+		if ( array_key_exists( $extension_name, $this->extensions ) ) {
+			return $this->extensions[ $extension_name ];
+		}
+
+		return null;
+	}
+
+	/**
+	 * Returns all set extension.
+	 *
+	 * @return WPSEO_Extension[] Array with the extensions.
+	 */
+	public function get_all() {
+		return $this->extensions;
+	}
+
+	/**
+	 * Checks if the plugin is activated within My Yoast.
+	 *
+	 * @param string $extension_name The extension name to check.
+	 *
+	 * @return bool True when the plugin is activated.
+	 */
+	public function is_activated( $extension_name ) {
+		if ( self::$active_extensions === null ) {
+			// Force re-check on license & dashboard pages.
+			$current_page = $this->get_current_page();
+
+			// Check whether the licenses are valid or whether we need to show notifications.
+			$exclude_cache = ( $current_page === 'wpseo_licenses' || $current_page === 'wpseo_dashboard' );
+
+			// Fetch transient data on any other page.
+			if ( ! $exclude_cache ) {
+				self::$active_extensions = $this->get_cached_extensions();
+			}
+
+			// If the active extensions is still NULL, we need to set it.
+			if ( ! is_array( self::$active_extensions ) ) {
+				self::$active_extensions = $this->retrieve_active_extensions();
+
+				$this->set_cached_extensions( self::$active_extensions );
+			}
+		}
+
+		return in_array( $extension_name, self::$active_extensions, true );
+	}
+
+	/**
+	 * Retrieves the active extensions via an external request.
+	 *
+	 * @return array Array containing the active extensions.
+	 */
+	protected function retrieve_active_extensions() {
+		return (array) apply_filters( 'yoast-active-extensions', array() );
+	}
+
+	/**
+	 * Returns the current page.
+	 *
+	 * @return string The current page.
+	 */
+	protected function get_current_page() {
+		return filter_input( INPUT_GET, 'page' );
+	}
+
+	/**
+	 * Gets a cached list of active extensions.
+	 *
+	 * @return boolean|array The cached extensions.
+	 */
+	protected function get_cached_extensions() {
+		return get_transient( self::TRANSIENT_CACHE_KEY );
+	}
+
+	/**
+	 * Sets the active extensions transient for the set duration.
+	 *
+	 * @param array $extensions The extensions to add.
+	 * @param int   $duration   The duration that the list of extensions needs to remain cached.
+	 *
+	 * @return void
+	 */
+	protected function set_cached_extensions( $extensions, $duration = DAY_IN_SECONDS ) {
+		set_transient( self::TRANSIENT_CACHE_KEY, $extensions, $duration );
+	}
+}