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<?php
namespace Yoast\WP\SEO;
use Throwable;
use WP_CLI;
use YoastSEO_Vendor\Symfony\Component\DependencyInjection\ContainerInterface;
/**
* Class that manages loading integrations if and only if all their conditionals are met.
*/
class Loader {
/**
* The registered integrations.
*
* @var string[]
*/
protected $integrations = [];
/**
* The registered integrations.
*
* @var string[]
*/
protected $initializers = [];
/**
* The registered routes.
*
* @var string[]
*/
protected $routes = [];
/**
* The registered commands.
*
* @var string[]
*/
protected $commands = [];
/**
* The registered migrations.
*
* @var string[]
*/
protected $migrations = [];
/**
* The dependency injection container.
*
* @var ContainerInterface
*/
protected $container;
/**
* Loader constructor.
*
* @param ContainerInterface $container The dependency injection container.
*/
public function __construct( ContainerInterface $container ) {
$this->container = $container;
}
/**
* Registers an integration.
*
* @param string $integration_class The class name of the integration to be loaded.
*
* @return void
*/
public function register_integration( $integration_class ) {
$this->integrations[] = $integration_class;
}
/**
* Registers an initializer.
*
* @param string $initializer_class The class name of the initializer to be loaded.
*
* @return void
*/
public function register_initializer( $initializer_class ) {
$this->initializers[] = $initializer_class;
}
/**
* Registers a route.
*
* @param string $route_class The class name of the route to be loaded.
*
* @return void
*/
public function register_route( $route_class ) {
$this->routes[] = $route_class;
}
/**
* Registers a command.
*
* @param string $command_class The class name of the command to be loaded.
*
* @return void
*/
public function register_command( $command_class ) {
$this->commands[] = $command_class;
}
/**
* Registers a migration.
*
* @param string $plugin The plugin the migration belongs to.
* @param string $version The version of the migration.
* @param string $migration_class The class name of the migration to be loaded.
*
* @return void
*/
public function register_migration( $plugin, $version, $migration_class ) {
if ( ! \array_key_exists( $plugin, $this->migrations ) ) {
$this->migrations[ $plugin ] = [];
}
$this->migrations[ $plugin ][ $version ] = $migration_class;
}
/**
* Loads all registered classes if their conditionals are met.
*
* @return void
*/
public function load() {
$this->load_initializers();
if ( ! \did_action( 'init' ) ) {
\add_action( 'init', [ $this, 'load_integrations' ] );
}
else {
$this->load_integrations();
}
\add_action( 'rest_api_init', [ $this, 'load_routes' ] );
if ( \defined( 'WP_CLI' ) && \WP_CLI ) {
$this->load_commands();
}
}
/**
* Returns all registered migrations.
*
* @param string $plugin The plugin to get the migrations for.
*
* @return string[]|false The registered migrations. False if no migrations were registered.
*/
public function get_migrations( $plugin ) {
if ( ! \array_key_exists( $plugin, $this->migrations ) ) {
return false;
}
return $this->migrations[ $plugin ];
}
/**
* Loads all registered commands.
*
* @return void
*/
protected function load_commands() {
foreach ( $this->commands as $class ) {
$command = $this->get_class( $class );
if ( $command === null ) {
continue;
}
WP_CLI::add_command( $class::get_namespace(), $command );
}
}
/**
* Loads all registered initializers if their conditionals are met.
*
* @return void
*/
protected function load_initializers() {
foreach ( $this->initializers as $class ) {
if ( ! $this->conditionals_are_met( $class ) ) {
continue;
}
$initializer = $this->get_class( $class );
if ( $initializer === null ) {
continue;
}
$initializer->initialize();
}
}
/**
* Loads all registered integrations if their conditionals are met.
*
* @return void
*/
public function load_integrations() {
foreach ( $this->integrations as $class ) {
if ( ! $this->conditionals_are_met( $class ) ) {
continue;
}
$integration = $this->get_class( $class );
if ( $integration === null ) {
continue;
}
$integration->register_hooks();
}
}
/**
* Loads all registered routes if their conditionals are met.
*
* @return void
*/
public function load_routes() {
foreach ( $this->routes as $class ) {
if ( ! $this->conditionals_are_met( $class ) ) {
continue;
}
$route = $this->get_class( $class );
if ( $route === null ) {
continue;
}
$route->register_routes();
}
}
/**
* Checks if all conditionals of a given loadable are met.
*
* @param string $loadable_class The class name of the loadable.
*
* @return bool Whether all conditionals of the loadable are met.
*/
protected function conditionals_are_met( $loadable_class ) {
// In production environments do not fatal if the class does not exist but log and fail gracefully.
if ( \YOAST_ENVIRONMENT === 'production' && ! \class_exists( $loadable_class ) ) {
if ( \defined( 'WP_DEBUG' ) && \WP_DEBUG ) {
// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
\error_log(
\sprintf(
/* translators: %1$s expands to Yoast SEO, %2$s expands to the name of the class that could not be found. */
\__( '%1$s attempted to load the class %2$s but it could not be found.', 'wordpress-seo' ),
'Yoast SEO',
$loadable_class
)
);
}
return false;
}
$conditionals = $loadable_class::get_conditionals();
foreach ( $conditionals as $class ) {
$conditional = $this->get_class( $class );
if ( $conditional === null || ! $conditional->is_met() ) {
return false;
}
}
return true;
}
/**
* Gets a class from the container.
*
* @param string $class_name The class name.
*
* @return object|null The class or, in production environments, null if it does not exist.
*
* @throws Throwable If the class does not exist in development environments.
*/
protected function get_class( $class_name ) {
try {
return $this->container->get( $class_name );
} catch ( Throwable $e ) {
// In production environments do not fatal if the class could not be constructed but log and fail gracefully.
if ( \YOAST_ENVIRONMENT === 'production' ) {
if ( \defined( 'WP_DEBUG' ) && \WP_DEBUG ) {
// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
\error_log( $e->getMessage() );
}
return null;
}
throw $e;
}
}
}