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REST API: Filter responses based on the _fields parameter, before data is processed.

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Historically, the REST API would generate the entire response object, including running expensive filters, then it would apply the `_fields` parameter, discarding the fields that weren't specificed.

This change causes `_fields` to be applied earlier, so that only requested fields are processed.

Props danielbachhuber.
See #43874.



git-svn-id: https://develop.svn.wordpress.org/trunk@43087 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Gary Pendergast
2018-05-02 01:24:30 +00:00
parent 1a4e28818f
commit 4ac3f4c13a
22 changed files with 526 additions and 167 deletions
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29
src/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
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@@ -505,6 +505,35 @@ abstract class WP_REST_Controller {
return $schema['title'];
}
/**
* Gets an array of fields to be included on the response.
*
* Included fields are based on item schema and `_fields=` request argument.
*
* @since 4.9.6
*
* @param WP_REST_Request $request Full details about the request.
* @return array Fields to be included in the response.
*/
public function get_fields_for_response( $request ) {
$schema = $this->get_item_schema();
$fields = isset( $schema['properties'] ) ? array_keys( $schema['properties'] ) : array();
if ( ! isset( $request['_fields'] ) ) {
return $fields;
}
$requested_fields = is_array( $request['_fields'] ) ? $request['_fields'] : preg_split( '/[\s,]+/', $request['_fields'] );
if ( 0 === count( $requested_fields ) ) {
return $fields;
}
// Trim off outside whitespace from the comma delimited list.
$requested_fields = array_map( 'trim', $requested_fields );
// Always persist 'id', because it can be needed for add_additional_fields_to_object().
if ( in_array( 'id', $fields, true ) ) {
$requested_fields[] = 'id';
}
return array_intersect( $fields, $requested_fields );
}
/**
* Retrieves an array of endpoint arguments from the item schema for the controller.
*