Add upstream

wp-content/plugins/jetpack/sal/class.json-api-metadata.php

@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * Utility classes that don't necessarily have a home yet
+ */
+
+class WPCOM_JSON_API_Metadata {
+	public static function is_public( $key ) {
+		if ( empty( $key ) )
+			return false;
+
+		// Default whitelisted meta keys.
+		$whitelisted_meta = array( '_thumbnail_id' );
+
+		// whitelist of metadata that can be accessed
+		/** This filter is documented in json-endpoints/class.wpcom-json-api-post-endpoint.php */
+		if ( in_array( $key, apply_filters( 'rest_api_allowed_public_metadata', $whitelisted_meta ) ) )
+			return true;
+
+		if ( 0 === strpos( $key, 'geo_' ) )
+			return true;
+
+		if ( 0 === strpos( $key, '_wpas_' ) )
+			return true;
+
+		return false;
+	}
+
+	public static function is_internal_only( $key ) {
+
+		if ( 0 === strpos( $key, '_jetpack_') )
+			return true;
+
+		if ( 0 === strpos( $key, '_elasticsearch_') )
+			return true;
+
+		return false;
+	}
+}