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to_array(), $context ); } /** * Get validation error details for debugging purposes. * This is the core validation method - all other validation methods use this. * * @param array $tool_data The tool data to validate. * * @return array Array of validation errors, empty if valid. */ public static function get_validation_errors( array $tool_data ): array { $errors = array(); // Sanitize string inputs. if ( isset( $tool_data['name'] ) && is_string( $tool_data['name'] ) ) { $tool_data['name'] = trim( $tool_data['name'] ); } if ( isset( $tool_data['description'] ) && is_string( $tool_data['description'] ) ) { $tool_data['description'] = trim( $tool_data['description'] ); } if ( isset( $tool_data['title'] ) && is_string( $tool_data['title'] ) ) { $tool_data['title'] = trim( $tool_data['title'] ); } // Check the required fields. if ( empty( $tool_data['name'] ) || ! is_string( $tool_data['name'] ) || ! self::validate_tool_name( $tool_data['name'] ) ) { $errors[] = __( 'Tool name is required and must only contain letters, numbers, hyphens (-), and underscores (_), and be 255 characters or less', 'mcp-adapter' ); } if ( empty( $tool_data['description'] ) || ! is_string( $tool_data['description'] ) ) { $errors[] = __( 'Tool description is required and must be a non-empty string', 'mcp-adapter' ); } // Validate inputSchema (required field). $input_schema_errors = self::get_schema_validation_errors( $tool_data['inputSchema'] ?? null, 'inputSchema' ); if ( ! empty( $input_schema_errors ) ) { $errors = array_merge( $errors, $input_schema_errors ); } // Check optional fields if present. if ( isset( $tool_data['title'] ) && ! is_string( $tool_data['title'] ) ) { $errors[] = __( 'Tool title must be a string if provided', 'mcp-adapter' ); } // Validate outputSchema (optional field). if ( isset( $tool_data['outputSchema'] ) ) { $output_schema_errors = self::get_schema_validation_errors( $tool_data['outputSchema'], 'outputSchema' ); if ( ! empty( $output_schema_errors ) ) { $errors = array_merge( $errors, $output_schema_errors ); } } if ( isset( $tool_data['annotations'] ) && ! is_array( $tool_data['annotations'] ) ) { $errors[] = __( 'Tool annotations must be an array if provided', 'mcp-adapter' ); } return $errors; } /** * Get detailed validation errors for a schema object. * * @param array|mixed $schema The schema to validate. * @param string $field_name The name of the field being validated (for error messages). * * @return array Array of validation errors, empty if valid. */ private static function get_schema_validation_errors( $schema, string $field_name ): array { // Normalize stdClass to array for validation, and reject scalars/null. if ( $schema instanceof stdClass ) { $schema = (array) $schema; } // Schema must be an array/object - early return for performance. if ( ! is_array( $schema ) ) { return array( sprintf( /* translators: %s: field name (inputSchema or outputSchema) */ __( 'Tool %s must be a valid JSON schema object', 'mcp-adapter' ), $field_name ), ); } $errors = array(); // Input schemas commonly describe an object of arguments. Allow omitted type (empty schema) or type 'object'. // For output schemas, do not enforce a specific type; any valid JSON Schema is acceptable per MCP. if ( 'inputSchema' === $field_name && isset( $schema['type'] ) && 'object' !== $schema['type'] ) { $errors[] = sprintf( /* translators: %s: field name */ __( 'Tool %s, if specifying a type, must use type \'object\'', 'mcp-adapter' ), $field_name ); } // If properties exist, they must be an array/object. if ( isset( $schema['properties'] ) && ! is_array( $schema['properties'] ) ) { $errors[] = sprintf( /* translators: %s: field name */ __( 'Tool %s properties must be an object/array', 'mcp-adapter' ), $field_name ); } // If required exists, it must be an array. if ( isset( $schema['required'] ) && ! is_array( $schema['required'] ) ) { $errors[] = sprintf( /* translators: %s: field name */ __( 'Tool %s required field must be an array', 'mcp-adapter' ), $field_name ); } // If properties are provided, validate their basic structure. if ( isset( $schema['properties'] ) && is_array( $schema['properties'] ) ) { foreach ( $schema['properties'] as $property_name => $property ) { if ( ! is_array( $property ) ) { $errors[] = sprintf( /* translators: %1$s: field name, %2$s: property name */ __( 'Tool %1$s property \'%2$s\' must be an object', 'mcp-adapter' ), $field_name, $property_name ); continue; } // Each property should have a type (though not strictly required by JSON Schema). if ( ! isset( $property['type'] ) || is_string( $property['type'] ) || is_array( $property['type'] ) ) { continue; } // If type is neither string nor array, it's invalid. $errors[] = sprintf( /* translators: %1$s: field name, %2$s: property name */ __( 'Tool %1$s property \'%2$s\' type must be a string or array of strings (union type)', 'mcp-adapter' ), $field_name, $property_name ); } } // If required array is provided, validate its structure. if ( isset( $schema['required'] ) && is_array( $schema['required'] ) ) { foreach ( $schema['required'] as $required_field ) { if ( ! is_string( $required_field ) ) { $errors[] = sprintf( /* translators: %s: field name */ __( 'Tool %s required field names must be strings', 'mcp-adapter' ), $field_name ); continue; } // Check that required fields exist in properties (if properties are defined). if ( ! isset( $schema['properties'] ) || isset( $schema['properties'][ $required_field ] ) ) { continue; } $errors[] = sprintf( /* translators: %1$s: field name, %2$s: required field */ __( 'Tool %1$s required field \'%2$s\' does not exist in properties', 'mcp-adapter' ), $field_name, $required_field ); } } return $errors; } /** * Check if tool data is valid without throwing exceptions. * * @param array $tool_data The tool data to validate. * * @return bool True if valid, false otherwise. */ public static function is_valid_tool_data( array $tool_data ): bool { return empty( self::get_validation_errors( $tool_data ) ); } /** * Check if a tool name follows MCP naming conventions. * * @param string $name The tool name to validate. * * @return bool True if valid, false otherwise. */ public static function validate_tool_name( string $name ): bool { // Tool names should not be empty. if ( empty( $name ) ) { return false; } // Check length constraints (reasonable limits). if ( strlen( $name ) > 255 ) { return false; } // Only allow letters, numbers, hyphens, and underscores. return (bool) preg_match( '/^[a-zA-Z0-9_-]+$/', $name ); } /** * Validate that the tool name is unique within the server. * * @param \WP\MCP\Domain\Tools\McpTool $tool The tool instance to validate. * @param string $context Optional context for error messages. * * @return bool|\WP_Error True if unique, WP_Error if the tool name is not unique. */ public static function validate_tool_uniqueness( McpTool $tool, string $context = '' ) { $this_tool_name = $tool->get_name(); $server = $tool->get_mcp_server(); $existing_tool = $server->get_tool( $this_tool_name ); // Check if a tool with this name already exists. if ( $existing_tool ) { $error_message = $context ? "[{$context}] " : ''; $error_message .= sprintf( /* translators: %1$s: tool name, %2$s: server ID */ __( 'Tool name \'%1$s\' is not unique. A tool with this name already exists on server \'%2$s\'.', 'mcp-adapter' ), $this_tool_name, $server->get_server_id() ); return new \WP_Error( 'tool_not_unique', esc_html( $error_message ) ); } return true; } }