Title: WP_REST_Font_Faces_Controller::validate_create_font_face_settings
Published: April 3, 2024
Last modified: May 20, 2026

---

# WP_REST_Font_Faces_Controller::validate_create_font_face_settings( string $value, WP_REST_Request $request ): true|󠀁[WP_Error](https://developer.wordpress.org/reference/classes/wp_error/)󠁿

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#wp--skip-link--target)

Validates settings when creating a font face.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#parameters)󠁿

 `$value`stringrequired

Encoded JSON string of font face settings.

`$request`[WP_REST_Request](https://developer.wordpress.org/reference/classes/wp_rest_request/)
required

Request object.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#return)󠁿

 true|[WP_Error](https://developer.wordpress.org/reference/classes/wp_error/) True
if the settings are valid, otherwise a [WP_Error](https://developer.wordpress.org/reference/classes/wp_error/)
object.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#source)󠁿

    ```php
    public function validate_create_font_face_settings( $value, $request ) {
    	// Enforce JSON Schema validity for field before applying custom validation logic.
    	$args     = $this->get_create_params();
    	$validity = rest_validate_value_from_schema( $value, $args['font_face_settings'], 'font_face_settings' );

    	if ( is_wp_error( $validity ) ) {
    		return $validity;
    	}

    	$settings = json_decode( $value, true );

    	// Check settings string is valid JSON.
    	if ( null === $settings ) {
    		return new WP_Error(
    			'rest_invalid_param',
    			__( 'font_face_settings parameter must be a valid JSON string.' ),
    			array( 'status' => 400 )
    		);
    	}

    	// Check that the font face settings match the theme.json schema.
    	$schema             = $this->get_item_schema()['properties']['font_face_settings'];
    	$has_valid_settings = rest_validate_value_from_schema( $settings, $schema, 'font_face_settings' );

    	if ( is_wp_error( $has_valid_settings ) ) {
    		$has_valid_settings->add_data( array( 'status' => 400 ) );
    		return $has_valid_settings;
    	}

    	// Check that none of the required settings are empty values.
    	$required = $schema['required'];
    	foreach ( $required as $key ) {
    		if ( isset( $settings[ $key ] ) && ! $settings[ $key ] ) {
    			return new WP_Error(
    				'rest_invalid_param',
    				/* translators: %s: Name of the missing font face settings parameter, e.g. "font_face_settings[src]". */
    				sprintf( __( '%s cannot be empty.' ), "font_face_setting[ $key ]" ),
    				array( 'status' => 400 )
    			);
    		}
    	}

    	$srcs  = is_array( $settings['src'] ) ? $settings['src'] : array( $settings['src'] );
    	$files = $request->get_file_params();

    	foreach ( $srcs as $src ) {
    		// Check that each src is a non-empty string.
    		$src = ltrim( $src );
    		if ( empty( $src ) ) {
    			return new WP_Error(
    				'rest_invalid_param',
    				/* translators: %s: Font face source parameter name: "font_face_settings[src]". */
    				sprintf( __( '%s values must be non-empty strings.' ), 'font_face_settings[src]' ),
    				array( 'status' => 400 )
    			);
    		}

    		// Check that srcs are valid URLs or file references.
    		if ( false === wp_http_validate_url( $src ) && ! isset( $files[ $src ] ) ) {
    			return new WP_Error(
    				'rest_invalid_param',
    				/* translators: 1: Font face source parameter name: "font_face_settings[src]", 2: The invalid src value. */
    				sprintf( __( '%1$s value "%2$s" must be a valid URL or file reference.' ), 'font_face_settings[src]', $src ),
    				array( 'status' => 400 )
    			);
    		}
    	}

    	// Check that each file in the request references a src in the settings.
    	foreach ( array_keys( $files ) as $file ) {
    		if ( ! in_array( $file, $srcs, true ) ) {
    			return new WP_Error(
    				'rest_invalid_param',
    				/* translators: 1: File key (e.g. "file-0") in the request data, 2: Font face source parameter name: "font_face_settings[src]". */
    				sprintf( __( 'File %1$s must be used in %2$s.' ), $file, 'font_face_settings[src]' ),
    				array( 'status' => 400 )
    			);
    		}
    	}

    	return true;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/rest-api/endpoints/class-wp-rest-font-faces-controller.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/rest-api/endpoints/class-wp-rest-font-faces-controller.php#L163)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/rest-api/endpoints/class-wp-rest-font-faces-controller.php#L163-L244)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#related)󠁿

| Uses | Description | 
| [WP_REST_Font_Faces_Controller::get_create_params()](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/get_create_params/)`wp-includes/rest-api/endpoints/class-wp-rest-font-faces-controller.php` |

Get the params used when creating a new font face.

  | 
| [WP_REST_Font_Faces_Controller::get_item_schema()](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/get_item_schema/)`wp-includes/rest-api/endpoints/class-wp-rest-font-faces-controller.php` |

Retrieves the post’s schema, conforming to JSON Schema.

  | 
| [rest_validate_value_from_schema()](https://developer.wordpress.org/reference/functions/rest_validate_value_from_schema/)`wp-includes/rest-api.php` |

Validate a value based on a schema.

  | 
| [wp_http_validate_url()](https://developer.wordpress.org/reference/functions/wp_http_validate_url/)`wp-includes/http.php` |

Validates a URL as safe for use in the HTTP API.

  | 
| [__()](https://developer.wordpress.org/reference/functions/__/)`wp-includes/l10n.php` |

Retrieves the translation of $text.

  | 
| [is_wp_error()](https://developer.wordpress.org/reference/functions/is_wp_error/)`wp-includes/load.php` |

Checks whether the given variable is a WordPress Error.

  | 
| [WP_Error::__construct()](https://developer.wordpress.org/reference/classes/wp_error/__construct/)`wp-includes/class-wp-error.php` |

Initializes the error.

  |

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## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_rest_font_faces_controller/validate_create_font_face_settings/?output_format=md#changelog)󠁿

| Version | Description | 
| [6.5.0](https://developer.wordpress.org/reference/since/6.5.0/) | Introduced. |

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