WPCOM_REST_API_V2_Field_Controller::update() - Code Metrics - Inspection of "Improve the matching of the youtube shortcode reve..." - Automattic/jetpack - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — sync/youtube ( ad817d...e4c966 )

by Jeremy

created 2018-12-03 12:51 UTC

WPCOM_REST_API_V2_Field_Controller::update() A

↳ Parent: WPCOM_REST_API_V2_Field_Controller

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
nc	1
nop	3
dl	0
loc	4
rs	10
c	0
b	0
f	0

<?php

// @todo - nicer API for array values?

/**
 * `WP_REST_Controller` is basically a wrapper for `register_rest_route()`
 * `WPCOM_REST_API_V2_Field_Controller` is a mostly-analogous wrapper for `register_rest_field()`
 */
abstract class WPCOM_REST_API_V2_Field_Controller {
	/**
	 * @var string|string[] $object_type The REST Object Type(s) to which the field should be added.
	 */
	protected $object_type;

	/**
	 * @var string $field_name The name of the REST API field to add.
	 */
	protected $field_name;

	public function __construct() {
		if ( ! $this->object_type ) {
			/* translators: %s: object_type */
			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::$object_type', sprintf( __( "Property '%s' must be overridden.", 'jetpack' ), 'object_type' ), 'Jetpack 6.8' );
			return;
		}

		if ( ! $this->field_name ) {
			/* translators: %s: field_name */
			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::$field_name', sprintf( __( "Property '%s' must be overridden.", 'jetpack' ), 'field_name' ), 'Jetpack 6.8' );
			return;
		}

		add_action( 'rest_api_init', array( $this, 'register_fields' ) );
	}

	/**
	 * Registers the field with the appropriate schema and callbacks.
	 */
	public function register_fields() {
		foreach ( (array) $this->object_type as $object_type ) {
			register_rest_field(
				$object_type,
				$this->field_name,
				array(
					'get_callback'    => array( $this, 'get_for_response' ),
					'update_callback' => array( $this, 'update_from_request' ),
					'schema'          => $this->get_schema(),
				)
			);
		}
	}

	/**
	 * Ensures the response matches the schema and request context.
	 *
	 * @param mixed           $value
	 * @param WP_REST_Request $request
	 * @return mixed
	 */
	private function prepare_for_response( $value, $request ) {
		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$schema  = $this->get_schema();

		$is_valid = rest_validate_value_from_schema( $value, $schema, $this->field_name );
		if ( is_wp_error( $is_valid ) ) {
			return $is_valid;
		}

		return $this->filter_response_by_context( $value, $schema, $context );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
	}

	/**
	 * Returns the schema's default value
	 *
	 * If there is no default, returns the type's falsey value.
	 *
	 * @param array $schema
	 * @return mixed
	 */
	final public function get_default_value( $schema ) {
		if ( isset( $schema['default'] ) ) {
			return $schema['default'];
		}

		// If you have something more complicated, use $schema['default'];
		switch ( isset( $schema['type'] ) ? $schema['type'] : 'null' ) {
			case 'string':
				return '';
			case 'integer':
			case 'number':
				return 0;
			case 'object':
				return (object) array();
			case 'array':
				return array();
			case 'boolean':
				return false;
			case 'null':
			default:
				return null;
		}
	}

	/**
	 * The field's wrapped getter. Does permission checks and output preparation.
	 *
	 * This cannot be extended: implement `->get()` instead.
	 *
	 * @param mixed           $object_data Probably an array. Whatever the endpoint returns.
	 * @param string          $field_name Should always match `->field_name`
	 * @param WP_REST_Request $request
	 * @param string          $object_type Should always match `->object_type`
	 * @return mixed
	 */
	final public function get_for_response( $object_data, $field_name, $request, $object_type ) {
		$permission_check = $this->get_permission_check( $object_data, $request );

		if ( ! $permission_check ) {
			/* translators: %s: get_permission_check() */
			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get_permission_check', sprintf( __( "Method '%s' must return either true or WP_Error.", 'jetpack' ), 'get_permission_check' ), 'Jetpack 6.8' );
			return $this->get_default_value( $this->get_schema() );

		}

		if ( is_wp_error( $permission_check ) ) {
			return $this->get_default_value( $this->get_schema() );

		}

		$value = $this->get( $object_data, $request );

		return $this->prepare_for_response( $value, $request );
	}

	/**
	 * The field's wrapped setter. Does permission checks.
	 *
	 * This cannot be extended: implement `->update()` instead.
	 *
	 * @param mixed           $value The new value for the field.
	 * @param mixed           $object_data Probably a WordPress object (e.g., WP_Post)
	 * @param string          $field_name Should always match `->field_name`
	 * @param WP_REST_Request $request
	 * @param string          $object_type Should always match `->object_type`
	 * @return void|WP_Error
	 */
	final public function update_from_request( $value, $object_data, $field_name, $request, $object_type ) {
		$permission_check = $this->update_permission_check( $value, $object_data, $request );

		if ( ! $permission_check ) {
			/* translators: %s: update_permission_check() */
			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::update_permission_check', sprintf( __( "Method '%s' must return either true or WP_Error.", 'jetpack' ), 'update_permission_check' ), 'Jetpack 6.8' );
			/* translators: %s: the name of an API response field */
			return new WP_Error( 'invalid_user_permission', sprintf( __( "You are not allowed to access the '%s' field.", 'jetpack' ), $this->field_name ) );
		}

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

		$updated = $this->update( $value, $object_data, $request );

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

	/**
	 * Permission Check for the field's getter. Must be implemented in the inheriting class.
	 *
	 * @param mixed           $object_data Whatever the endpoint would return for its response.
	 * @param WP_REST_Request $request
	 * @return true|WP_Error
	 */
	public function get_permission_check( $object_data, $request ) {
		/* translators: %s: get_permission_check() */
		_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get_permission_check', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
	}

	/**
	 * The field's "raw" getter. Must be implemented in the inheriting class.
	 *
	 * @param mixed           $object_data Whatever the endpoint would return for its response.
	 * @param WP_REST_Request $request
	 * @return mixed
	 */
	public function get( $object_data, $request ) {
		/* translators: %s: get() */
		_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
	}

	/**
	 * Permission Check for the field's setter. Must be implemented in the inheriting class.
	 *
	 * @param mixed           $value The new value for the field.
	 * @param mixed           $object_data Probably a WordPress object (e.g., WP_Post)
	 * @param WP_REST_Request $request
	 * @return true|WP_Error
	 */
	public function update_permission_check( $value, $object_data, $request ) {
		/* translators: %s: update_permission_check() */
		_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::update_permission_check', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
	}

	/**
	 * The field's "raw" setter. Must be implemented in the inheriting class.
	 *
	 * @param mixed           $value The new value for the field.
	 * @param mixed           $object_data Probably a WordPress object (e.g., WP_Post)
	 * @param WP_REST_Request $request
	 * @return mixed
	 */
	public function update( $value, $object_data, $request ) {
		/* translators: %s: update() */
		_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::update', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
	}

	/**
	 * The JSON Schema for the field
	 *
	 * @link https://json-schema.org/understanding-json-schema/
	 * As of WordPress 5.0, Core currently understands:
	 * * type
	 *   * string - not minLength, not maxLength, not pattern
	 *   * integer - minimum, maximum, exclusiveMinimum, exclusiveMaximum, not multipleOf
	 *   * number  - minimum, maximum, exclusiveMinimum, exclusiveMaximum, not multipleOf
	 *   * boolean
	 *   * null
	 *   * object - properties, additionalProperties, not propertyNames, not dependencies, not patternProperties, not required
	 *   * array: only lists, not tuples - items, not minItems, not maxItems, not uniqueItems, not contains
	 * * enum
	 * * format
	 *   * date-time
	 *   * email
	 *   * ip
	 *   * uri
	 * As of WordPress 5.0, Core does not support:
	 * * Multiple type: `type: [ 'string', 'integer' ]`
	 * * $ref, allOf, anyOf, oneOf, not, const
	 *
	 * @return array
	 */
	public function get_schema() {
		/* translators: %s: get_schema() */
		_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get_schema', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
	}

	/**
	 * @param array  $schema
	 * @param string $context REST API Request context
	 * @return bool
	 */
	private function is_valid_for_context( $schema, $context ) {
		return empty( $schema['context'] ) || in_array( $context, $schema['context'], true );
	}

	/**
	 * Removes properties that should not appear in the current
	 * request's context
	 *
	 * $context is a Core REST API Framework request attribute that is
	 * always one of:
	 * * view (what you see on the blog)
	 * * edit (what you see in an editor)
	 * * embed (what you see in, e.g., an oembed)
	 *
	 * Fields (and sub-fields, and sub-sub-...) can be flagged for a
	 * set of specific contexts via the field's schema.
	 *
	 * The Core API will filter out top-level fields with the wrong
	 * context, but will not recurse deeply enough into arrays/objects
	 * to remove all levels of sub-fields with the wrong context.
	 *
	 * This function handles that recursion.
	 *
	 * @param mixed  $value
	 * @param array  $schema
	 * @param string $context REST API Request context
	 * @return mixed Filtered $value
	 */
	final public function filter_response_by_context( $value, $schema, $context ) {
		if ( ! $this->is_valid_for_context( $schema, $context ) ) {
			// We use this intentionally odd looking WP_Error object
			// internally only in this recursive function (see below
			// in the `object` case). It will never be output by the REST API.
			// If we return this for the top level object, Core
			// correctly remove the top level object from the response
			// for us.
			return new WP_Error( '__wrong-context__' );
		}

		switch ( $schema['type'] ) {
			case 'array':
				if ( ! isset( $schema['items'] ) ) {
					return $value;
				}

				// Shortcircuit if we know none of the items are valid for this context.
				// This would only happen in a strangely written schema.
				if ( ! $this->is_valid_for_context( $schema['items'], $context ) ) {
					return array();
				}

				// Recurse to prune sub-properties of each item.
				foreach ( $value as $key => $item ) {
					$value[ $key ] = $this->filter_response_by_context( $item, $schema['items'], $context );
				}

				return $value;
			case 'object':
				if ( ! isset( $schema['properties'] ) ) {
					return $value;
				}

				foreach ( $value as $field_name => $field_value ) {
					if ( isset( $schema['properties'][ $field_name ] ) ) {
						$field_value = $this->filter_response_by_context( $field_value, $schema['properties'][ $field_name ], $context );
						if ( is_wp_error( $field_value ) && '__wrong-context__' === $field_value->get_error_code() ) {
							unset( $value[ $field_name ] );
						} else {
							// Respect recursion that pruned sub-properties of each property.
							$value[ $field_name ] = $field_value;
						}
					}
				}

				return (object) $value;
		}

		return $value;
	}
}


1			<?php
2
3			// @todo - nicer API for array values?
4
5			/**
6			* `WP_REST_Controller` is basically a wrapper for `register_rest_route()`
7			* `WPCOM_REST_API_V2_Field_Controller` is a mostly-analogous wrapper for `register_rest_field()`
8			*/
9			abstract class WPCOM_REST_API_V2_Field_Controller {
10			/**
11			* @var string\|string[] $object_type The REST Object Type(s) to which the field should be added.
12			*/
13			protected $object_type;
14
15			/**
16			* @var string $field_name The name of the REST API field to add.
17			*/
18			protected $field_name;
19
20			public function __construct() {
21			if ( ! $this->object_type ) {
22			/* translators: %s: object_type */
23			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::$object_type', sprintf( __( "Property '%s' must be overridden.", 'jetpack' ), 'object_type' ), 'Jetpack 6.8' );
24			return;
25			}
26
27			if ( ! $this->field_name ) {
28			/* translators: %s: field_name */
29			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::$field_name', sprintf( __( "Property '%s' must be overridden.", 'jetpack' ), 'field_name' ), 'Jetpack 6.8' );
30			return;
31			}
32
33			add_action( 'rest_api_init', array( $this, 'register_fields' ) );
34			}
35
36			/**
37			* Registers the field with the appropriate schema and callbacks.
38			*/
39			public function register_fields() {
40			foreach ( (array) $this->object_type as $object_type ) {
41			register_rest_field(
42			$object_type,
43			$this->field_name,
44			array(
45			'get_callback' => array( $this, 'get_for_response' ),
46			'update_callback' => array( $this, 'update_from_request' ),
47			'schema' => $this->get_schema(),
48			)
49			);
50			}
51			}
52
53			/**
54			* Ensures the response matches the schema and request context.
55			*
56			* @param mixed $value
57			* @param WP_REST_Request $request
58			* @return mixed
59			*/
60			private function prepare_for_response( $value, $request ) {
61			$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
62			$schema = $this->get_schema();
63
64			$is_valid = rest_validate_value_from_schema( $value, $schema, $this->field_name );
65			if ( is_wp_error( $is_valid ) ) {
66			return $is_valid;
67			}
68
69			return $this->filter_response_by_context( $value, $schema, $context );
			0 ignored issues – show Bug introduced 2018-11-12 16:27 UTC by Report Bug Copy Issue Report It seems like `$schema` defined by `$this->get_schema()` on line `62` can also be of type `null`; however, `WPCOM_REST_API_V2_Field_...r_response_by_context()` does only seem to accept `array`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
70			}
71
72			/**
73			* Returns the schema's default value
74			*
75			* If there is no default, returns the type's falsey value.
76			*
77			* @param array $schema
78			* @return mixed
79			*/
80			final public function get_default_value( $schema ) {
81			if ( isset( $schema['default'] ) ) {
82			return $schema['default'];
83			}
84
85			// If you have something more complicated, use $schema['default'];
86			switch ( isset( $schema['type'] ) ? $schema['type'] : 'null' ) {
87			case 'string':
88			return '';
89			case 'integer':
90			case 'number':
91			return 0;
92			case 'object':
93			return (object) array();
94			case 'array':
95			return array();
96			case 'boolean':
97			return false;
98			case 'null':
99			default:
100			return null;
101			}
102			}
103
104			/**
105			* The field's wrapped getter. Does permission checks and output preparation.
106			*
107			* This cannot be extended: implement `->get()` instead.
108			*
109			* @param mixed $object_data Probably an array. Whatever the endpoint returns.
110			* @param string $field_name Should always match `->field_name`
111			* @param WP_REST_Request $request
112			* @param string $object_type Should always match `->object_type`
113			* @return mixed
114			*/
115			final public function get_for_response( $object_data, $field_name, $request, $object_type ) {
116			$permission_check = $this->get_permission_check( $object_data, $request );
117
118			if ( ! $permission_check ) {
119			/* translators: %s: get_permission_check() */
120			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get_permission_check', sprintf( __( "Method '%s' must return either true or WP_Error.", 'jetpack' ), 'get_permission_check' ), 'Jetpack 6.8' );
121			return $this->get_default_value( $this->get_schema() );
			0 ignored issues – show Bug introduced 2018-11-13 22:33 UTC by Report Bug Copy Issue Report It seems like `$this->get_schema()` targeting `WPCOM_REST_API_V2_Field_Controller::get_schema()` can also be of type `null`; however, `WPCOM_REST_API_V2_Field_...er::get_default_value()` does only seem to accept `array`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
122			}
123
124			if ( is_wp_error( $permission_check ) ) {
125			return $this->get_default_value( $this->get_schema() );
			0 ignored issues – show Bug introduced 2018-11-12 16:27 UTC by Report Bug Copy Issue Report It seems like `$this->get_schema()` targeting `WPCOM_REST_API_V2_Field_Controller::get_schema()` can also be of type `null`; however, `WPCOM_REST_API_V2_Field_...er::get_default_value()` does only seem to accept `array`, maybe add an additional type check? This check looks at variables that are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
126			}
127
128			$value = $this->get( $object_data, $request );
129
130			return $this->prepare_for_response( $value, $request );
131			}
132
133			/**
134			* The field's wrapped setter. Does permission checks.
135			*
136			* This cannot be extended: implement `->update()` instead.
137			*
138			* @param mixed $value The new value for the field.
139			* @param mixed $object_data Probably a WordPress object (e.g., WP_Post)
140			* @param string $field_name Should always match `->field_name`
141			* @param WP_REST_Request $request
142			* @param string $object_type Should always match `->object_type`
143			* @return void\|WP_Error
144			*/
145			final public function update_from_request( $value, $object_data, $field_name, $request, $object_type ) {
146			$permission_check = $this->update_permission_check( $value, $object_data, $request );
147
148			if ( ! $permission_check ) {
149			/* translators: %s: update_permission_check() */
150			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::update_permission_check', sprintf( __( "Method '%s' must return either true or WP_Error.", 'jetpack' ), 'update_permission_check' ), 'Jetpack 6.8' );
151			/* translators: %s: the name of an API response field */
152			return new WP_Error( 'invalid_user_permission', sprintf( __( "You are not allowed to access the '%s' field.", 'jetpack' ), $this->field_name ) );
153			}
154
155			if ( is_wp_error( $permission_check ) ) {
156			return $permission_check;
157			}
158
159			$updated = $this->update( $value, $object_data, $request );
160
161			if ( is_wp_error( $updated ) ) {
162			return $updated;
163			}
164			}
165
166			/**
167			* Permission Check for the field's getter. Must be implemented in the inheriting class.
168			*
169			* @param mixed $object_data Whatever the endpoint would return for its response.
170			* @param WP_REST_Request $request
171			* @return true\|WP_Error
172			*/
173			public function get_permission_check( $object_data, $request ) {
174			/* translators: %s: get_permission_check() */
175			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get_permission_check', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
176			}
177
178			/**
179			* The field's "raw" getter. Must be implemented in the inheriting class.
180			*
181			* @param mixed $object_data Whatever the endpoint would return for its response.
182			* @param WP_REST_Request $request
183			* @return mixed
184			*/
185			public function get( $object_data, $request ) {
186			/* translators: %s: get() */
187			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
188			}
189
190			/**
191			* Permission Check for the field's setter. Must be implemented in the inheriting class.
192			*
193			* @param mixed $value The new value for the field.
194			* @param mixed $object_data Probably a WordPress object (e.g., WP_Post)
195			* @param WP_REST_Request $request
196			* @return true\|WP_Error
197			*/
198			public function update_permission_check( $value, $object_data, $request ) {
199			/* translators: %s: update_permission_check() */
200			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::update_permission_check', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
201			}
202
203			/**
204			* The field's "raw" setter. Must be implemented in the inheriting class.
205			*
206			* @param mixed $value The new value for the field.
207			* @param mixed $object_data Probably a WordPress object (e.g., WP_Post)
208			* @param WP_REST_Request $request
209			* @return mixed
210			*/
211			public function update( $value, $object_data, $request ) {
212			/* translators: %s: update() */
213			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::update', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
214			}
215
216			/**
217			* The JSON Schema for the field
218			*
219			* @link https://json-schema.org/understanding-json-schema/
220			* As of WordPress 5.0, Core currently understands:
221			* * type
222			* * string - not minLength, not maxLength, not pattern
223			* * integer - minimum, maximum, exclusiveMinimum, exclusiveMaximum, not multipleOf
224			* * number - minimum, maximum, exclusiveMinimum, exclusiveMaximum, not multipleOf
225			* * boolean
226			* * null
227			* * object - properties, additionalProperties, not propertyNames, not dependencies, not patternProperties, not required
228			* * array: only lists, not tuples - items, not minItems, not maxItems, not uniqueItems, not contains
229			* * enum
230			* * format
231			* * date-time
232			* * email
233			* * ip
234			* * uri
235			* As of WordPress 5.0, Core does not support:
236			* * Multiple type: `type: [ 'string', 'integer' ]`
237			* * $ref, allOf, anyOf, oneOf, not, const
238			*
239			* @return array
240			*/
241			public function get_schema() {
242			/* translators: %s: get_schema() */
243			_doing_it_wrong( 'WPCOM_REST_API_V2_Field_Controller::get_schema', sprintf( __( "Method '%s' must be overridden.", 'jetpack' ), __METHOD__ ), 'Jetpack 6.8' );
244			}
245
246			/**
247			* @param array $schema
248			* @param string $context REST API Request context
249			* @return bool
250			*/
251			private function is_valid_for_context( $schema, $context ) {
252			return empty( $schema['context'] ) \|\| in_array( $context, $schema['context'], true );
253			}
254
255			/**
256			* Removes properties that should not appear in the current
257			* request's context
258			*
259			* $context is a Core REST API Framework request attribute that is
260			* always one of:
261			* * view (what you see on the blog)
262			* * edit (what you see in an editor)
263			* * embed (what you see in, e.g., an oembed)
264			*
265			* Fields (and sub-fields, and sub-sub-...) can be flagged for a
266			* set of specific contexts via the field's schema.
267			*
268			* The Core API will filter out top-level fields with the wrong
269			* context, but will not recurse deeply enough into arrays/objects
270			* to remove all levels of sub-fields with the wrong context.
271			*
272			* This function handles that recursion.
273			*
274			* @param mixed $value
275			* @param array $schema
276			* @param string $context REST API Request context
277			* @return mixed Filtered $value
278			*/
279			final public function filter_response_by_context( $value, $schema, $context ) {
280			if ( ! $this->is_valid_for_context( $schema, $context ) ) {
281			// We use this intentionally odd looking WP_Error object
282			// internally only in this recursive function (see below
283			// in the `object` case). It will never be output by the REST API.
284			// If we return this for the top level object, Core
285			// correctly remove the top level object from the response
286			// for us.
287			return new WP_Error( '__wrong-context__' );
288			}
289
290			switch ( $schema['type'] ) {
291			case 'array':
292			if ( ! isset( $schema['items'] ) ) {
293			return $value;
294			}
295
296			// Shortcircuit if we know none of the items are valid for this context.
297			// This would only happen in a strangely written schema.
298			if ( ! $this->is_valid_for_context( $schema['items'], $context ) ) {
299			return array();
300			}
301
302			// Recurse to prune sub-properties of each item.
303			foreach ( $value as $key => $item ) {
304			$value[ $key ] = $this->filter_response_by_context( $item, $schema['items'], $context );
305			}
306
307			return $value;
308			case 'object':
309			if ( ! isset( $schema['properties'] ) ) {
310			return $value;
311			}
312
313			foreach ( $value as $field_name => $field_value ) {
314			if ( isset( $schema['properties'][ $field_name ] ) ) {
315			$field_value = $this->filter_response_by_context( $field_value, $schema['properties'][ $field_name ], $context );
316			if ( is_wp_error( $field_value ) && '__wrong-context__' === $field_value->get_error_code() ) {
317			unset( $value[ $field_name ] );
318			} else {
319			// Respect recursion that pruned sub-properties of each property.
320			$value[ $field_name ] = $field_value;
321			}
322			}
323			}
324
325			return (object) $value;
326			}
327
328			return $value;
329			}
330			}
331

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WPCOM_REST_API_V2_Field_Controller::update() A

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