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<?php
/**
 * Connectors API.
 *
 * @package WordPress
 * @subpackage Connectors
 * @since 7.0.0
 */

use WordPress\AiClient\AiClient;
use WordPress\AiClient\Providers\Http\DTO\ApiKeyRequestAuthentication;

/**
 * Checks if a connector is registered.
 *
 * @since 7.0.0
 *
 * @see WP_Connector_Registry::is_registered()
 *
 * @param string $id The connector identifier.
 * @return bool True if the connector is registered, false otherwise.
 */
function wp_is_connector_registered( string $id ): bool {
	$registry = WP_Connector_Registry::get_instance();
	if ( null === $registry ) {
		return false;
	}

	return $registry->is_registered( $id );
}

/**
 * Retrieves a registered connector.
 *
 * @since 7.0.0
 *
 * @see WP_Connector_Registry::get_registered()
 *
 * @param string $id The connector identifier.
 * @return array|null {
 *     Connector data, or null if not registered.
 *
 *     @type string $name           The connector's display name.
 *     @type string $description    The connector's description.
 *     @type string $logo_url       Optional. URL to the connector's logo image.
 *     @type string $type           The connector type, e.g. 'ai_provider'.
 *     @type array  $authentication {
 *         Authentication configuration. When method is 'api_key', includes
 *         credentials_url, setting_name, and optionally constant_name and
 *         env_var_name. When 'none', only method is present.
 *
 *         @type string $method          The authentication method: 'api_key' or 'none'.
 *         @type string $credentials_url Optional. URL where users can obtain API credentials.
 *         @type string $setting_name    Optional. The setting name for the API key.
 *         @type string $constant_name   Optional. PHP constant name for the API key.
 *         @type string $env_var_name    Optional. Environment variable name for the API key.
 *     }
 *     @type array  $plugin         {
 *         Optional. Plugin data for install/activate UI.
 *
 *         @type string   $file      The plugin's main file path relative to the plugins
 *                                   directory (e.g. 'my-plugin/my-plugin.php' or 'hello.php').
 *         @type callable $is_active Callback to determine whether the plugin is active. Receives no arguments and must return bool.
 *                                   Defaults to `__return_true`.
 *     }
 * }
 * @phpstan-return ?array{
 *     name: non-empty-string,
 *     description: string,
 *     logo_url?: non-empty-string,
 *     type: non-empty-string,
 *     authentication: array{
 *         method: 'api_key'|'none',
 *         credentials_url?: non-empty-string,
 *         setting_name?: non-empty-string,
 *         constant_name?: non-empty-string,
 *         env_var_name?: non-empty-string
 *     },
 *     plugin: array{
 *         file?: non-empty-string,
 *         is_active: callable(): bool,
 *     }
 * }
 */
function wp_get_connector( string $id ): ?array {
	$registry = WP_Connector_Registry::get_instance();
	if ( null === $registry ) {
		return null;
	}

	return $registry->get_registered( $id );
}

/**
 * Retrieves all registered connectors.
 *
 * @since 7.0.0
 *
 * @see WP_Connector_Registry::get_all_registered()
 *
 * @return array {
 *     Connector settings keyed by connector ID.
 *
 *     @type array ...$0 {
 *         Data for a single connector.
 *
 *         @type string      $name           The connector's display name.
 *         @type string      $description    The connector's description.
 *         @type string      $logo_url       Optional. URL to the connector's logo image.
 *         @type string      $type           The connector type, e.g. 'ai_provider'.
 *         @type array       $authentication {
 *             Authentication configuration. When method is 'api_key', includes
 *             credentials_url, setting_name, and optionally constant_name and
 *             env_var_name. When 'none', only method is present.
 *
 *             @type string $method          The authentication method: 'api_key' or 'none'.
 *             @type string $credentials_url Optional. URL where users can obtain API credentials.
 *             @type string $setting_name    Optional. The setting name for the API key.
 *             @type string $constant_name   Optional. PHP constant name for the API key.
 *             @type string $env_var_name    Optional. Environment variable name for the API key.
 *         }
 *         @type array       $plugin         {
 *             Optional. Plugin data for install/activate UI.
 *
 *             @type string   $file      The plugin's main file path relative to the plugins
 *                                       directory (e.g. 'my-plugin/my-plugin.php' or 'hello.php').
 *             @type callable $is_active Callback to determine whether the plugin is active. Receives no arguments and must return bool.
 *                                       Defaults to `__return_true`.
 *         }
 *     }
 * }
 * @phpstan-return array<string, array{
 *     name: non-empty-string,
 *     description: string,
 *     logo_url?: non-empty-string,
 *     type: non-empty-string,
 *     authentication: array{
 *         method: 'api_key'|'none',
 *         credentials_url?: non-empty-string,
 *         setting_name?: non-empty-string,
 *         constant_name?: non-empty-string,
 *         env_var_name?: non-empty-string
 *     },
 *     plugin: array{
 *         file?: non-empty-string,
 *         is_active: callable(): bool,
 *     }
 * }>
 */
function wp_get_connectors(): array {
	$registry = WP_Connector_Registry::get_instance();
	if ( null === $registry ) {
		return array();
	}

	return $registry->get_all_registered();
}

/**
 * Resolves an AI provider logo file path to a URL.
 *
 * Converts an absolute file path to a plugin URL. The path must reside within
 * the plugins or must-use plugins directory.
 *
 * @since 7.0.0
 * @access private
 *
 * @param string $path Absolute path to the logo file.
 * @return non-empty-string|null The URL to the logo file, or null if the path is invalid.
 */
function _wp_connectors_resolve_ai_provider_logo_url( string $path ): ?string {
	if ( ! $path ) {
		return null;
	}

	$path = wp_normalize_path( $path );

	if ( ! file_exists( $path ) ) {
		return null;
	}

	$mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR );
	if ( str_starts_with( $path, $mu_plugin_dir . '/' ) ) {
		$logo_url = plugins_url( substr( $path, strlen( $mu_plugin_dir ) ), WPMU_PLUGIN_DIR . '/.' );
		return $logo_url ? $logo_url : null;
	}

	$plugin_dir = wp_normalize_path( WP_PLUGIN_DIR );
	if ( str_starts_with( $path, $plugin_dir . '/' ) ) {
		$logo_url = plugins_url( substr( $path, strlen( $plugin_dir ) ) );
		return $logo_url ? $logo_url : null;
	}

	_doing_it_wrong(
		__FUNCTION__,
		__( 'Provider logo path must be located within the plugins or must-use plugins directory.' ),
		'7.0.0'
	);

	return null;
}

/**
 * Initializes the connector registry with default connectors and fires the registration action.
 *
 * Creates the registry instance, registers built-in connectors (which cannot be unhooked),
 * and then fires the `wp_connectors_init` action for plugins to register their own connectors.
 *
 * @since 7.0.0
 * @access private
 */
function _wp_connectors_init(): void {
	$registry = new WP_Connector_Registry();
	WP_Connector_Registry::set_instance( $registry );

	// Only register default AI providers if AI support is enabled.
	if ( wp_supports_ai() ) {
		_wp_connectors_register_default_ai_providers( $registry );
	}

	// Non-AI default connectors.
	$registry->register(
		'akismet',
		array(
			'name'           => __( 'Akismet Anti-spam' ),
			'description'    => __( 'Protect your site from spam.' ),
			'type'           => 'spam_filtering',
			'plugin'         => array(
				'file'      => 'akismet/akismet.php',
				'is_active' => static function () {
					return defined( 'AKISMET_VERSION' );
				},
			),
			'authentication' => array(
				'method'          => 'api_key',
				'credentials_url' => 'https://akismet.com/get/',
				'setting_name'    => 'wordpress_api_key',
				'constant_name'   => 'WPCOM_API_KEY',
			),
		)
	);

	/**
	 * Fires when the connector registry is ready for plugins to register connectors.
	 *
	 * Built-in connectors and any AI providers auto-discovered from the WP AI Client
	 * registry have already been registered at this point and cannot be unhooked.
	 *
	 * AI provider plugins that register with the WP AI Client do not need to use
	 * this action — their connectors are created automatically. This action is
	 * primarily for registering non-AI-provider connectors or overriding metadata
	 * on existing connectors.
	 *
	 * Use `$registry->register()` within this action to add new connectors.
	 * To override an existing connector, unregister it first, then re-register
	 * with updated data.
	 *
	 * Example — overriding metadata on an auto-discovered connector:
	 *
	 *     add_action( 'wp_connectors_init', function ( WP_Connector_Registry $registry ) {
	 *         if ( $registry->is_registered( 'anthropic' ) ) {
	 *             $connector = $registry->unregister( 'anthropic' );
	 *             $connector['description'] = __( 'Custom description for Anthropic.', 'my-plugin' );
	 *             $registry->register( 'anthropic', $connector );
	 *         }
	 *     } );
	 *
	 * @since 7.0.0
	 *
	 * @param WP_Connector_Registry $registry Connector registry instance.
	 */
	do_action( 'wp_connectors_init', $registry );
}

/**
 * Registers connectors for the built-in AI providers.
 *
 * @since 7.0.0
 * @access private
 *
 * @param WP_Connector_Registry $registry The connector registry instance.
 */
function _wp_connectors_register_default_ai_providers( WP_Connector_Registry $registry ): void {
	// Built-in connectors.
	$defaults = array(
		'anthropic' => array(
			'name'           => 'Anthropic',
			'description'    => __( 'Text generation with Claude.' ),
			'type'           => 'ai_provider',
			'plugin'         => array(
				'file' => 'ai-provider-for-anthropic/plugin.php',
			),
			'authentication' => array(
				'method'          => 'api_key',
				'credentials_url' => 'https://platform.claude.com/settings/keys',
			),
		),
		'google'    => array(
			'name'           => 'Google',
			'description'    => __( 'Text and image generation with Gemini and Imagen.' ),
			'type'           => 'ai_provider',
			'plugin'         => array(
				'file' => 'ai-provider-for-google/plugin.php',
			),
			'authentication' => array(
				'method'          => 'api_key',
				'credentials_url' => 'https://aistudio.google.com/api-keys',
			),
		),
		'openai'    => array(
			'name'           => 'OpenAI',
			'description'    => __( 'Text and image generation with GPT and Dall-E.' ),
			'type'           => 'ai_provider',
			'plugin'         => array(
				'file' => 'ai-provider-for-openai/plugin.php',
			),
			'authentication' => array(
				'method'          => 'api_key',
				'credentials_url' => 'https://platform.openai.com/api-keys',
			),
		),
	);

	// Merge AI Client registry data on top of defaults.
	// Registry values (from provider plugins) take precedence over hardcoded fallbacks.
	$ai_registry = AiClient::defaultRegistry();

	foreach ( array_filter( $ai_registry->getRegisteredProviderIds() ) as $connector_id ) {
		$provider_class_name = $ai_registry->getProviderClassName( $connector_id );
		$provider_metadata   = $provider_class_name::metadata();

		$auth_method = $provider_metadata->getAuthenticationMethod();
		$is_api_key  = null !== $auth_method && $auth_method->isApiKey();

		if ( $is_api_key ) {
			$credentials_url = $provider_metadata->getCredentialsUrl();
			$authentication  = array(
				'method' => 'api_key',
			);
			if ( $credentials_url ) {
				$authentication['credentials_url'] = $credentials_url;
			}
		} else {
			$authentication = array( 'method' => 'none' );
		}

		$name        = $provider_metadata->getName();
		$description = $provider_metadata->getDescription();
		$logo_url    = $provider_metadata->getLogoPath()
			? _wp_connectors_resolve_ai_provider_logo_url( $provider_metadata->getLogoPath() )
			: null;

		if ( isset( $defaults[ $connector_id ] ) ) {
			// Override fields with non-empty registry values.
			if ( $name ) {
				$defaults[ $connector_id ]['name'] = $name;
			}
			if ( $description ) {
				$defaults[ $connector_id ]['description'] = $description;
			}
			if ( $logo_url ) {
				$defaults[ $connector_id ]['logo_url'] = $logo_url;
			}
			// Always update auth method; keep existing credentials_url as fallback.
			$defaults[ $connector_id ]['authentication']['method'] = $authentication['method'];
			if ( ! empty( $authentication['credentials_url'] ) ) {
				$defaults[ $connector_id ]['authentication']['credentials_url'] = $authentication['credentials_url'];
			}
		} else {
			$defaults[ $connector_id ] = array(
				'name'           => $name ? $name : ucwords( $connector_id ),
				'description'    => $description ? $description : '',
				'type'           => 'ai_provider',
				'authentication' => $authentication,
			);
			if ( $logo_url ) {
				$defaults[ $connector_id ]['logo_url'] = $logo_url;
			}
		}
	}

	// Register all default connectors directly on the registry.
	foreach ( $defaults as $id => $args ) {
		if ( 'api_key' === $args['authentication']['method'] ) {
			$sanitized_id = str_replace( '-', '_', $id );

			$args['authentication']['setting_name'] = "connectors_ai_{$sanitized_id}_api_key";

			// All AI providers use the {CONSTANT_CASE_ID}_API_KEY naming convention.
			$constant_case_key = strtoupper( (string) preg_replace( '/([a-z])([A-Z])/', '$1_$2', $sanitized_id ) ) . '_API_KEY';

			$args['authentication']['constant_name'] = $constant_case_key;
			$args['authentication']['env_var_name']  = $constant_case_key;
		}

		$args['plugin']['is_active'] = static function () use ( $ai_registry, $id ): bool {
			try {
				return $ai_registry->hasProvider( $id );
			} catch ( Exception $e ) {
				return false;
			}
		};

		$registry->register( $id, $args );
	}
}

/**
 * Masks an API key, showing only the last 4 characters.
 *
 * @since 7.0.0
 * @access private
 *
 * @param string $key The API key to mask.
 * @return string The masked key, e.g. "************fj39".
 */
function _wp_connectors_mask_api_key( string $key ): string {
	if ( strlen( $key ) <= 4 ) {
		return $key;
	}

	return str_repeat( "\u{2022}", min( strlen( $key ) - 4, 16 ) ) . substr( $key, -4 );
}

/**
 * Determines the source of an API key for a given connector.
 *
 * Checks in order: environment variable, PHP constant, database.
 * Environment variable and constant are only checked when their
 * respective names are provided.
 *
 * @since 7.0.0
 * @access private
 *
 * @param string $setting_name  The option name for the API key (e.g., 'connectors_spam_filtering_my_plugin_api_key').
 * @param string $env_var_name  Optional. Environment variable name to check (e.g., 'MY_PLUGIN_API_KEY').
 * @param string $constant_name Optional. PHP constant name to check (e.g., 'MY_PLUGIN_API_KEY').
 * @return string The key source: 'env', 'constant', 'database', or 'none'.
 */
function _wp_connectors_get_api_key_source( string $setting_name, string $env_var_name = '', string $constant_name = '' ): string {
	// Check environment variable first.
	if ( '' !== $env_var_name ) {
		$env_value = getenv( $env_var_name );
		if ( false !== $env_value && '' !== $env_value ) {
			return 'env';
		}
	}

	// Check PHP constant.
	if ( '' !== $constant_name && defined( $constant_name ) ) {
		$const_value = constant( $constant_name );
		if ( is_string( $const_value ) && '' !== $const_value ) {
			return 'constant';
		}
	}

	// Check database.
	$db_value = get_option( $setting_name, '' );
	if ( '' !== $db_value ) {
		return 'database';
	}

	return 'none';
}

/**
 * Checks whether an API key is valid for a given provider.
 *
 * @since 7.0.0
 * @access private
 *
 * @param string $key         The API key to check.
 * @param string $provider_id The WP AI client provider ID.
 * @return bool|null True if valid, false if invalid, null if unable to determine.
 */
function _wp_connectors_is_ai_api_key_valid( string $key, string $provider_id ): ?bool {
	try {
		$registry = AiClient::defaultRegistry();

		if ( ! $registry->hasProvider( $provider_id ) ) {
			_doing_it_wrong(
				__FUNCTION__,
				sprintf(
					/* translators: %s: AI provider ID. */
					__( 'The provider "%s" is not registered in the AI client registry.' ),
					$provider_id
				),
				'7.0.0'
			);
			return null;
		}

		$registry->setProviderRequestAuthentication(
			$provider_id,
			new ApiKeyRequestAuthentication( $key )
		);

		return $registry->isProviderConfigured( $provider_id );
	} catch ( Exception $e ) {
		wp_trigger_error( __FUNCTION__, $e->getMessage() );
		return null;
	}
}

/**
 * Masks and validates connector API keys in REST responses.
 *
 * On every `/wp/v2/settings` response, masks connector API key values so raw
 * keys are never exposed via the REST API.
 *
 * On POST or PUT requests, validates each updated key against the provider
 * before masking. If validation fails, the key is reverted to an empty string.
 *
 * @since 7.0.0
 * @access private
 *
 * @param WP_REST_Response $response The response object.
 * @param WP_REST_Server   $server   The server instance.
 * @param WP_REST_Request  $request  The request object.
 * @return WP_REST_Response The modified response with masked/validated keys.
 */
function _wp_connectors_rest_settings_dispatch( WP_REST_Response $response, WP_REST_Server $server, WP_REST_Request $request ): WP_REST_Response {
	if ( '/wp/v2/settings' !== $request->get_route() ) {
		return $response;
	}

	$data = $response->get_data();
	if ( ! is_array( $data ) ) {
		return $response;
	}

	$is_update = 'POST' === $request->get_method() || 'PUT' === $request->get_method();

	foreach ( wp_get_connectors() as $connector_id => $connector_data ) {
		$auth = $connector_data['authentication'];
		if ( 'api_key' !== $auth['method'] || empty( $auth['setting_name'] ) ) {
			continue;
		}

		$setting_name = $auth['setting_name'];
		if ( ! array_key_exists( $setting_name, $data ) ) {
			continue;
		}

		$value = $data[ $setting_name ];

		// On update, validate AI provider keys before masking.
		// Non-AI connectors accept keys as-is; the service plugin handles its own validation.
		if ( $is_update && is_string( $value ) && '' !== $value && 'ai_provider' === $connector_data['type'] ) {
			if ( true !== _wp_connectors_is_ai_api_key_valid( $value, $connector_id ) ) {
				update_option( $setting_name, '' );
				$data[ $setting_name ] = '';
				continue;
			}
		}

		// Mask the key in the response.
		if ( is_string( $value ) && '' !== $value ) {
			$data[ $setting_name ] = _wp_connectors_mask_api_key( $value );
		}
	}

	$response->set_data( $data );
	return $response;
}
add_filter( 'rest_post_dispatch', '_wp_connectors_rest_settings_dispatch', 10, 3 );

/**
 * Registers default connector settings.
 *
 * @since 7.0.0
 * @access private
 */
function _wp_register_default_connector_settings(): void {
	$registered_settings = get_registered_settings();

	foreach ( wp_get_connectors() as $connector_data ) {
		$auth = $connector_data['authentication'];
		if ( 'api_key' !== $auth['method'] || empty( $auth['setting_name'] ) ) {
			continue;
		}

		// Skip if the setting is already registered (e.g. by an owning plugin).
		if ( isset( $registered_settings[ $auth['setting_name'] ] ) ) {
			continue;
		}

		if ( ! isset( $connector_data['plugin']['is_active'] ) || ! is_callable( $connector_data['plugin']['is_active'] ) ) {
			continue;
		}

		if ( ! call_user_func( $connector_data['plugin']['is_active'] ) ) {
			continue;
		}

		register_setting(
			'connectors',
			$auth['setting_name'],
			array(
				'type'              => 'string',
				'label'             => sprintf(
					/* translators: %s: Connector name. */
					__( '%s API Key' ),
					$connector_data['name']
				),
				'description'       => sprintf(
					/* translators: %s: Connector name. */
					__( 'API key for the %s connector.' ),
					$connector_data['name']
				),
				'default'           => '',
				'show_in_rest'      => true,
				'sanitize_callback' => 'sanitize_text_field',
			)
		);
	}
}
add_action( 'init', '_wp_register_default_connector_settings', 20 );

/**
 * Passes stored connector API keys to the WP AI client.
 *
 * @since 7.0.0
 * @access private
 */
function _wp_connectors_pass_default_keys_to_ai_client(): void {
	try {
		$ai_registry = AiClient::defaultRegistry();
		foreach ( wp_get_connectors() as $connector_id => $connector_data ) {
			if ( 'ai_provider' !== $connector_data['type'] ) {
				continue;
			}

			$auth = $connector_data['authentication'];
			if ( 'api_key' !== $auth['method'] || empty( $auth['setting_name'] ) ) {
				continue;
			}

			if ( ! $ai_registry->hasProvider( $connector_id ) ) {
				continue;
			}

			// Skip if the key is already provided via env var or constant.
			$key_source = _wp_connectors_get_api_key_source( $auth['setting_name'], $auth['env_var_name'] ?? '', $auth['constant_name'] ?? '' );
			if ( 'env' === $key_source || 'constant' === $key_source ) {
				continue;
			}

			$api_key = get_option( $auth['setting_name'], '' );
			if ( ! is_string( $api_key ) || '' === $api_key ) {
				continue;
			}

			$ai_registry->setProviderRequestAuthentication(
				$connector_id,
				new ApiKeyRequestAuthentication( $api_key )
			);
		}
	} catch ( Exception $e ) {
		wp_trigger_error( __FUNCTION__, $e->getMessage() );
	}
}
add_action( 'init', '_wp_connectors_pass_default_keys_to_ai_client', 20 );

/**
 * Exposes connector settings to the connectors-wp-admin script module.
 *
 * @since 7.0.0
 * @access private
 *
 * @param array<string, mixed> $data Existing script module data.
 * @return array<string, mixed> Script module data with connectors added.
 */
function _wp_connectors_get_connector_script_module_data( array $data ): array {
	$registry = AiClient::defaultRegistry();

	if ( ! function_exists( 'validate_plugin' ) ) {
		require_once ABSPATH . 'wp-admin/includes/plugin.php';
	}

	$connectors = array();
	foreach ( wp_get_connectors() as $connector_id => $connector_data ) {
		$auth     = $connector_data['authentication'];
		$auth_out = array( 'method' => $auth['method'] );

		if ( 'api_key' === $auth['method'] ) {
			$auth_out['settingName']    = $auth['setting_name'] ?? '';
			$auth_out['credentialsUrl'] = $auth['credentials_url'] ?? null;
			$key_source                 = _wp_connectors_get_api_key_source( $auth['setting_name'] ?? '', $auth['env_var_name'] ?? '', $auth['constant_name'] ?? '' );
			$auth_out['keySource']      = $key_source;

			if ( 'ai_provider' === $connector_data['type'] ) {
				try {
					$auth_out['isConnected'] = $registry->hasProvider( $connector_id ) && $registry->isProviderConfigured( $connector_id );
				} catch ( Exception $e ) {
					$auth_out['isConnected'] = false;
				}
			} else {
				$auth_out['isConnected'] = 'none' !== $key_source;
			}
		}

		$connector_out = array(
			'name'           => $connector_data['name'],
			'description'    => $connector_data['description'],
			'logoUrl'        => ! empty( $connector_data['logo_url'] ) ? $connector_data['logo_url'] : null,
			'type'           => $connector_data['type'],
			'authentication' => $auth_out,
		);

		if ( ! empty( $connector_data['plugin']['file'] ) ) {
			$file         = $connector_data['plugin']['file'];
			$is_activated = (bool) call_user_func( $connector_data['plugin']['is_active'] );
			$is_installed = $is_activated || 0 === validate_plugin( $file );

			$connector_out['plugin'] = array(
				'file'        => $file,
				'isInstalled' => $is_installed,
				'isActivated' => $is_activated,
			);
		}

		$connectors[ $connector_id ] = $connector_out;
	}
	ksort( $connectors );
	$data['connectors']        = $connectors;
	$data['isFileModDisabled'] = ! wp_is_file_mod_allowed( 'install_plugins' );
	return $data;
}
add_filter( 'script_module_data_options-connectors-wp-admin', '_wp_connectors_get_connector_script_module_data' );