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<?php
/**
* WPSEO plugin file.
*
* @package WPSEO\Admin
* @since 1.7.0
*/
/**
* Base class for handling plugin conflicts.
*/
class Yoast_Plugin_Conflict {
/**
* The plugins must be grouped per section.
*
* It's possible to check for each section if there are conflicting plugins.
*
* @var array
*/
protected $plugins = [];
/**
* All the current active plugins will be stored in this private var.
*
* @var array
*/
protected $all_active_plugins = [];
/**
* After searching for active plugins that are in $this->plugins the active plugins will be stored in this
* property.
*
* @var array
*/
protected $active_conflicting_plugins = [];
/**
* Property for holding instance of itself.
*
* @var Yoast_Plugin_Conflict
*/
protected static $instance;
/**
* For the use of singleton pattern. Create instance of itself and return this instance.
*
* @param string $class_name Give the classname to initialize. If classname is
* false (empty) it will use it's own __CLASS__.
*
* @return Yoast_Plugin_Conflict
*/
public static function get_instance( $class_name = '' ) {
if ( self::$instance === null ) {
if ( ! is_string( $class_name ) || $class_name === '' ) {
$class_name = self::class;
}
self::$instance = new $class_name();
}
return self::$instance;
}
/**
* Setting instance, all active plugins and search for active plugins.
*
* Protected constructor to prevent creating a new instance of the
* *Singleton* via the `new` operator from outside this class.
*/
protected function __construct() {
// Set active plugins.
$this->all_active_plugins = get_option( 'active_plugins' );
// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reason: We are not processing form information.
if ( isset( $_GET['action'] ) && is_string( $_GET['action'] ) ) {
// phpcs:ignore WordPress.Security.NonceVerification.Recommended,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are not processing form information and only comparing the variable in a condition.
$action = wp_unslash( $_GET['action'] );
if ( $action === 'deactivate' ) {
$this->remove_deactivated_plugin();
}
}
// Search for active plugins.
$this->search_active_plugins();
}
/**
* Check if there are conflicting plugins for given $plugin_section.
*
* @param string $plugin_section Type of plugin conflict (such as Open Graph or sitemap).
*
* @return bool
*/
public function check_for_conflicts( $plugin_section ) {
static $sections_checked;
// Return early if there are no active conflicting plugins at all.
if ( empty( $this->active_conflicting_plugins ) ) {
return false;
}
$sections_checked ??= [];
if ( ! in_array( $plugin_section, $sections_checked, true ) ) {
$sections_checked[] = $plugin_section;
return ( ! empty( $this->active_conflicting_plugins[ $plugin_section ] ) );
}
return false;
}
/**
* Checks for given $plugin_sections for conflicts.
*
* @param array $plugin_sections Set of sections.
*
* @return void
*/
public function check_plugin_conflicts( $plugin_sections ) {
foreach ( $plugin_sections as $plugin_section => $readable_plugin_section ) {
// Check for conflicting plugins and show error if there are conflicts.
if ( $this->check_for_conflicts( $plugin_section ) ) {
$this->set_error( $plugin_section, $readable_plugin_section );
}
}
// List of all active sections.
$sections = array_keys( $plugin_sections );
// List of all sections.
$all_plugin_sections = array_keys( $this->plugins );
/*
* Get all sections that are inactive.
* These plugins need to be cleared.
*
* This happens when Sitemaps or OpenGraph implementations toggle active/disabled.
*/
$inactive_sections = array_diff( $all_plugin_sections, $sections );
if ( ! empty( $inactive_sections ) ) {
foreach ( $inactive_sections as $section ) {
array_walk( $this->plugins[ $section ], [ $this, 'clear_error' ] );
}
}
// For active sections clear errors for inactive plugins.
foreach ( $sections as $section ) {
// By default, clear errors for all plugins of the section.
$inactive_plugins = $this->plugins[ $section ];
// If there are active plugins, filter them from being cleared.
if ( isset( $this->active_conflicting_plugins[ $section ] ) ) {
$inactive_plugins = array_diff( $this->plugins[ $section ], $this->active_conflicting_plugins[ $section ] );
}
array_walk( $inactive_plugins, [ $this, 'clear_error' ] );
}
}
/**
* Setting an error on the screen.
*
* @param string $plugin_section Type of conflict group (such as Open Graph or sitemap).
* @param string $readable_plugin_section This is the value for the translation.
*
* @return void
*/
protected function set_error( $plugin_section, $readable_plugin_section ) {
$notification_center = Yoast_Notification_Center::get();
foreach ( $this->active_conflicting_plugins[ $plugin_section ] as $plugin_file ) {
$plugin_name = $this->get_plugin_name( $plugin_file );
$error_message = '';
/* translators: %1$s: 'Facebook & Open Graph' plugin name(s) of possibly conflicting plugin(s), %2$s to Yoast SEO */
$error_message .= '<p>' . sprintf( __( 'The %1$s plugin might cause issues when used in conjunction with %2$s.', 'wordpress-seo' ), '<em>' . $plugin_name . '</em>', 'Yoast SEO' ) . '</p>';
$error_message .= '<p>' . sprintf( $readable_plugin_section, 'Yoast SEO', $plugin_name ) . '</p>';
/* translators: %s: 'Facebook' plugin name of possibly conflicting plugin */
$error_message .= '<a class="button button-primary" href="' . wp_nonce_url( 'plugins.php?action=deactivate&plugin=' . $plugin_file . '&plugin_status=all', 'deactivate-plugin_' . $plugin_file ) . '">' . sprintf( __( 'Deactivate %s', 'wordpress-seo' ), $this->get_plugin_name( $plugin_file ) ) . '</a> ';
$identifier = $this->get_notification_identifier( $plugin_file );
// Add the message to the notifications center.
$notification_center->add_notification(
new Yoast_Notification(
$error_message,
[
'type' => Yoast_Notification::ERROR,
'id' => 'wpseo-conflict-' . $identifier,
],
),
);
}
}
/**
* Clear the notification for a plugin.
*
* @param string $plugin_file Clear the optional notification for this plugin.
*
* @return void
*/
public function clear_error( $plugin_file ) {
$identifier = $this->get_notification_identifier( $plugin_file );
$notification_center = Yoast_Notification_Center::get();
$notification_center->remove_notification_by_id( 'wpseo-conflict-' . $identifier );
}
/**
* Loop through the $this->plugins to check if one of the plugins is active.
*
* This method will store the active plugins in $this->active_plugins.
*
* @return void
*/
protected function search_active_plugins() {
foreach ( $this->plugins as $plugin_section => $plugins ) {
$this->check_plugins_active( $plugins, $plugin_section );
}
}
/**
* Loop through plugins and check if each plugin is active.
*
* @param array $plugins Set of plugins.
* @param string $plugin_section Type of conflict group (such as Open Graph or sitemap).
*
* @return void
*/
protected function check_plugins_active( $plugins, $plugin_section ) {
foreach ( $plugins as $plugin ) {
if ( $this->check_plugin_is_active( $plugin ) ) {
$this->add_active_plugin( $plugin_section, $plugin );
}
}
}
/**
* Check if given plugin exists in array with all_active_plugins.
*
* @param string $plugin Plugin basename string.
*
* @return bool
*/
protected function check_plugin_is_active( $plugin ) {
return in_array( $plugin, $this->all_active_plugins, true );
}
/**
* Add plugin to the list of active plugins.
*
* This method will check first if key $plugin_section exists, if not it will create an empty array
* If $plugin itself doesn't exist it will be added.
*
* @param string $plugin_section Type of conflict group (such as Open Graph or sitemap).
* @param string $plugin Plugin basename string.
*
* @return void
*/
protected function add_active_plugin( $plugin_section, $plugin ) {
if ( ! array_key_exists( $plugin_section, $this->active_conflicting_plugins ) ) {
$this->active_conflicting_plugins[ $plugin_section ] = [];
}
if ( ! in_array( $plugin, $this->active_conflicting_plugins[ $plugin_section ], true ) ) {
$this->active_conflicting_plugins[ $plugin_section ][] = $plugin;
}
}
/**
* Search in $this->plugins for the given $plugin.
*
* If there is a result it will return the plugin category.
*
* @param string $plugin Plugin basename string.
*
* @return int|string
*/
protected function find_plugin_category( $plugin ) {
foreach ( $this->plugins as $plugin_section => $plugins ) {
if ( in_array( $plugin, $plugins, true ) ) {
return $plugin_section;
}
}
}
/**
* Get plugin name from file.
*
* @param string $plugin Plugin path relative to plugins directory.
*
* @return string|bool Plugin name or false when no name is set.
*/
protected function get_plugin_name( $plugin ) {
$plugin_details = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin );
if ( $plugin_details['Name'] !== '' ) {
return $plugin_details['Name'];
}
return false;
}
/**
* When being in the deactivation process the currently deactivated plugin has to be removed.
*
* @return void
*/
private function remove_deactivated_plugin() {
// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reason: On the deactivation screen the nonce is already checked by WordPress itself.
if ( ! isset( $_GET['plugin'] ) || ! is_string( $_GET['plugin'] ) ) {
return;
}
// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reason: On the deactivation screen the nonce is already checked by WordPress itself.
$deactivated_plugin = sanitize_text_field( wp_unslash( $_GET['plugin'] ) );
$key_to_remove = array_search( $deactivated_plugin, $this->all_active_plugins, true );
if ( $key_to_remove !== false ) {
unset( $this->all_active_plugins[ $key_to_remove ] );
}
}
/**
* Get the identifier from the plugin file.
*
* @param string $plugin_file Plugin file to get Identifier from.
*
* @return string
*/
private function get_notification_identifier( $plugin_file ) {
return md5( $plugin_file );
}
}