Fuxt API - Yoast SEO Field

includes/class-rest-post-controller.php

@@ -85,6 +85,7 @@ public function get_collection_params() {
 						'ancestors',
 						'next',
 						'prev',
+						'seo',
 					),
 				),
 			),
@@ -328,6 +329,10 @@ public static function get_item_schema() {
 					'description' => __( '(Optional by request) Previous data.' ),
 					'type'        => array( 'object', 'null' ),
 				),
+				'seo'            => array(
+					'description' => __( '(Optional by request) Yoast SEO meta data. Null when the Yoast SEO plugin is not active. The `schema` property is a JSON-LD string.' ),
+					'type'        => array( 'object', 'null' ),
+				),
 			),
 		);
 
@@ -442,6 +447,7 @@ public function get_additional_fields_for_response( $request ) {
 			'next',
 			'prev',
 			'depth',
+			'seo',
 		);
 
 		// Trim off outside whitespace from the comma delimited list.

includes/class-rest-posts-controller.php

@@ -141,6 +141,7 @@ public function get_collection_params() {
 						'ancestors',
 						'next',
 						'prev',
+						'seo',
 					),
 				),
 			),
@@ -223,6 +224,7 @@ public function get_additional_fields_for_response( $request ) {
 			'ancestors',
 			'next',
 			'prev',
+			'seo',
 		);
 
 		// Trim off outside whitespace from the comma delimited list.

includes/utils/class-post.php

@@ -72,6 +72,10 @@ public static function get_postdata( $post, $additional_fields = array(), $param
 				}
 			}
 
+			if ( in_array( 'seo', $additional_fields ) ) {
+				$data['seo'] = self::get_seodata( $post );
+			}
+
 			// Inherit additional fields for siblings, parent, children, next, prev post.
 			$inherit_fields = array_intersect(
 				$additional_fields,
@@ -206,6 +210,44 @@ function ( $sibling ) use ( $post ) {
 		return $data;
 	}
 
+	/**
+	 * Get Yoast SEO meta data for a post.
+	 *
+	 * Uses the Yoast SEO surface API. Returns null when Yoast SEO is not active
+	 * or has no meta for the post.
+	 *
+	 * @param \WP_Post $post Post object.
+	 *
+	 * @return array|null
+	 */
+	private static function get_seodata( $post ) {
+		if ( ! function_exists( 'YoastSEO' ) ) {
+			return null;
+		}
+
+		$meta = YoastSEO()->meta->for_post( $post->ID );
+
+		if ( ! $meta ) {
+			return null;
+		}
+
+		$json = json_decode( wp_json_encode( $meta->get_head()->json ), true );
+
+		if ( ! is_array( $json ) ) {
+			return null;
+		}
+
+		// Ship schema as a JSON string so JSON-LD keys (@context, @graph) survive client-side key transforms.
+		if ( isset( $json['schema'] ) ) {
+			$json['schema'] = wp_json_encode( $json['schema'] );
+		}
+
+		// Keyed by human-readable labels, which key transforms would mangle.
+		unset( $json['twitter_misc'] );
+
+		return $json;
+	}
+
 	/**
 	 * Get the next/previous hierarchical post type (eg: Pages)
 	 *