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<?php

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namespace Yoast\WP\SEO\Integrations;

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use WPSEO_Admin_Asset_Manager;

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use Yoast\WP\SEO\Conditionals\Admin_Conditional;

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use Yoast\WP\SEO\Conditionals\Feature_Flag_Conditional;

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/**

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* Gathers all feature flags and surfaces them to the JavaScript side of the plugin.

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class Feature_Flag_Integration implements Integration_Interface {

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/**

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* The admin asset manager.

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* @var WPSEO_Admin_Asset_Manager

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protected $asset_manager;

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/**

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* All of the feature flag conditionals.

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* @var Feature_Flag_Conditional[]

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protected $feature_flags;

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/**

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* Feature_Flag_Integration constructor.

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* @param WPSEO_Admin_Asset_Manager $asset_manager The admin asset manager.

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* @param Feature_Flag_Conditional ...$feature_flags All of the known feature flag conditionals.

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public function __construct( WPSEO_Admin_Asset_Manager $asset_manager, Feature_Flag_Conditional ...$feature_flags ) {

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$this->asset_manager = $asset_manager;

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$this->feature_flags = $feature_flags;

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}

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/**

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* Returns the conditionals based on which this loadable should be active.

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* @return string[] The conditionals based on which this loadable should be active.

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public static function get_conditionals() {

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return [ Admin_Conditional::class ];

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}

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/**

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* Initializes the integration.

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* @return void

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public function register_hooks() {

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\add_action( 'admin_init', [ $this, 'add_feature_flags' ] );

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}

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/**

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* Gathers all the feature flags and injects them into the JavaScript.

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* @return void

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public function add_feature_flags() {

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$enabled_features = $this->get_enabled_features();

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// Localize under both names for BC.

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$this->asset_manager->localize_script( 'feature-flag-package', 'wpseoFeatureFlags', $enabled_features );

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$this->asset_manager->localize_script( 'feature-flag-package', 'wpseoFeaturesL10n', $enabled_features );

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}

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/**

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* Returns an array of all enabled feature flags.

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* @return string[] The array of enabled features.

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public function get_enabled_features() {

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$enabled_features = [];

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foreach ( $this->feature_flags as $feature_flag ) {

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if ( $feature_flag->is_met() ) {

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$enabled_features[] = $feature_flag->get_feature_name();

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}

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}

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return $this->filter_enabled_features( $enabled_features );

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}

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/**

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* Runs the list of enabled feature flags through a filter.

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* @param string[] $enabled_features The list of currently enabled feature flags.

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* @return string[] The (possibly adapted) list of enabled features.

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protected function filter_enabled_features( $enabled_features ) {

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/**

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* Filters the list of currently enabled feature flags.

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* @param string[] $enabled_features The current list of enabled feature flags.

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$filtered_enabled_features = \apply_filters( 'wpseo_enable_feature', $enabled_features );

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if ( ! \is_array( $filtered_enabled_features ) ) {

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$filtered_enabled_features = $enabled_features;

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}

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return $filtered_enabled_features;

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}

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}

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