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<?php

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/**

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* REST API: WP_REST_Meta_Fields class

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* @package WordPress

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* @subpackage REST_API

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* @since 4.7.0

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/**

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* Core class to manage meta values for an object via the REST API.

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* @since 4.7.0

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#[AllowDynamicProperties]

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abstract class WP_REST_Meta_Fields {

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/**

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* Retrieves the object meta type.

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* @since 4.7.0

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* @return string One of 'post', 'comment', 'term', 'user', or anything

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* else supported by `_get_meta_table()`.

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abstract protected function get_meta_type();

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/**

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* Retrieves the object meta subtype.

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* @since 4.9.8

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* @return string Subtype for the meta type, or empty string if no specific subtype.

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protected function get_meta_subtype() {

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return '';

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}

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/**

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* Retrieves the object type for register_rest_field().

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* @since 4.7.0

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* @return string The REST field type, such as post type name, taxonomy name, 'comment', or `user`.

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abstract protected function get_rest_field_type();

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/**

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* Registers the meta field.

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* @since 4.7.0

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* @deprecated 5.6.0

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* @see register_rest_field()

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public function register_field() {

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_deprecated_function( __METHOD__, '5.6.0' );

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register_rest_field(

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$this->get_rest_field_type(),

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'meta',

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array(

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'get_callback' => array( $this, 'get_value' ),

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'update_callback' => array( $this, 'update_value' ),

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'schema' => $this->get_field_schema(),

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)

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);

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}

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/**

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* Retrieves the meta field value.

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* @since 4.7.0

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* @param int $object_id Object ID to fetch meta for.

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* @param WP_REST_Request $request Full details about the request.

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* @return array Array containing the meta values keyed by name.

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public function get_value( $object_id, $request ) {

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$fields = $this->get_registered_fields();

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$response = array();

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foreach ( $fields as $meta_key => $args ) {

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$name = $args['name'];

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$all_values = get_metadata( $this->get_meta_type(), $object_id, $meta_key, false );

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if ( $args['single'] ) {

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if ( empty( $all_values ) ) {

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$value = $args['schema']['default'];

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} else {

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$value = $all_values[0];

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}

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$value = $this->prepare_value_for_response( $value, $request, $args );

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} else {

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$value = array();

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if ( is_array( $all_values ) ) {

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foreach ( $all_values as $row ) {

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$value[] = $this->prepare_value_for_response( $row, $request, $args );

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}

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}

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}

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$response[ $name ] = $value;

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}

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return $response;

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}

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/**

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* Prepares a meta value for a response.

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* This is required because some native types cannot be stored correctly

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* in the database, such as booleans. We need to cast back to the relevant

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* type before passing back to JSON.

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* @since 4.7.0

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* @param mixed $value Meta value to prepare.

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* @param WP_REST_Request $request Current request object.

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* @param array $args Options for the field.

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* @return mixed Prepared value.

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protected function prepare_value_for_response( $value, $request, $args ) {

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if ( ! empty( $args['prepare_callback'] ) ) {

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$value = call_user_func( $args['prepare_callback'], $value, $request, $args );

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}

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return $value;

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}

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/**

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* Updates meta values.

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* @since 4.7.0

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* @param array $meta Array of meta parsed from the request.

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* @param int $object_id Object ID to fetch meta for.

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* @return null|WP_Error Null on success, WP_Error object on failure.

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public function update_value( $meta, $object_id ) {

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$fields = $this->get_registered_fields();

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$error = new WP_Error();

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foreach ( $fields as $meta_key => $args ) {

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$name = $args['name'];

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if ( ! array_key_exists( $name, $meta ) ) {

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continue;

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}

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$value = $meta[ $name ];

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* A null value means reset the field, which is essentially deleting it

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* from the database and then relying on the default value.

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* Non-single meta can also be removed by passing an empty array.

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if ( is_null( $value ) || ( array() === $value && ! $args['single'] ) ) {

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$args = $this->get_registered_fields()[ $meta_key ];

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if ( $args['single'] ) {

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$current = get_metadata( $this->get_meta_type(), $object_id, $meta_key, true );

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if ( is_wp_error( rest_validate_value_from_schema( $current, $args['schema'] ) ) ) {

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$error->add(

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'rest_invalid_stored_value',

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/* translators: %s: Custom field key. */

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sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),

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array( 'status' => 500 )

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);

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continue;

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}

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}

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$result = $this->delete_meta_value( $object_id, $meta_key, $name );

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if ( is_wp_error( $result ) ) {

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$error->merge_from( $result );

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}

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continue;

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}

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if ( ! $args['single'] && is_array( $value ) && count( array_filter( $value, 'is_null' ) ) ) {

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$error->add(

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'rest_invalid_stored_value',

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/* translators: %s: Custom field key. */

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sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),

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array( 'status' => 500 )

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);

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continue;

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}

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$is_valid = rest_validate_value_from_schema( $value, $args['schema'], 'meta.' . $name );

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if ( is_wp_error( $is_valid ) ) {

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$is_valid->add_data( array( 'status' => 400 ) );

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$error->merge_from( $is_valid );

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continue;

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}

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$value = rest_sanitize_value_from_schema( $value, $args['schema'] );

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if ( $args['single'] ) {

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$result = $this->update_meta_value( $object_id, $meta_key, $name, $value );

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} else {

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$result = $this->update_multi_meta_value( $object_id, $meta_key, $name, $value );

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}

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if ( is_wp_error( $result ) ) {

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$error->merge_from( $result );

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continue;

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}

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}

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if ( $error->has_errors() ) {

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return $error;

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}

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return null;

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}

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/**

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* Deletes a meta value for an object.

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* @since 4.7.0

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* @param int $object_id Object ID the field belongs to.

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* @param string $meta_key Key for the field.

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* @param string $name Name for the field that is exposed in the REST API.

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* @return true|WP_Error True if meta field is deleted, WP_Error otherwise.

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protected function delete_meta_value( $object_id, $meta_key, $name ) {

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$meta_type = $this->get_meta_type();

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if ( ! current_user_can( "delete_{$meta_type}_meta", $object_id, $meta_key ) ) {

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return new WP_Error(

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'rest_cannot_delete',

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/* translators: %s: Custom field key. */

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sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),

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array(

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'key' => $name,

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'status' => rest_authorization_required_code(),

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)

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);

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}

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if ( null === get_metadata_raw( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {

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return true;

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}

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if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {

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return new WP_Error(

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'rest_meta_database_error',

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__( 'Could not delete meta value from database.' ),

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array(

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'key' => $name,

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'status' => WP_Http::INTERNAL_SERVER_ERROR,

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)

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);

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}

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return true;

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}

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/**

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* Updates multiple meta values for an object.

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* Alters the list of values in the database to match the list of provided values.

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* @since 4.7.0

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* @param int $object_id Object ID to update.

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* @param string $meta_key Key for the custom field.

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* @param string $name Name for the field that is exposed in the REST API.

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* @param array $values List of values to update to.

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* @return true|WP_Error True if meta fields are updated, WP_Error otherwise.

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protected function update_multi_meta_value( $object_id, $meta_key, $name, $values ) {

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$meta_type = $this->get_meta_type();

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if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {

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return new WP_Error(

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'rest_cannot_update',

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/* translators: %s: Custom field key. */

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sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),

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array(

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'key' => $name,

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'status' => rest_authorization_required_code(),

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)

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);

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}

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$current_values = get_metadata( $meta_type, $object_id, $meta_key, false );

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$subtype = get_object_subtype( $meta_type, $object_id );

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if ( ! is_array( $current_values ) ) {

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$current_values = array();

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}

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$to_remove = $current_values;

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$to_add = $values;

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foreach ( $to_add as $add_key => $value ) {

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$remove_keys = array_keys(

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array_filter(

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$current_values,

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function ( $stored_value ) use ( $meta_key, $subtype, $value ) {

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return $this->is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $value );

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}

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)

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);

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if ( empty( $remove_keys ) ) {

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continue;

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}

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if ( count( $remove_keys ) > 1 ) {

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// To remove, we need to remove first, then add, so don't touch.

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continue;

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}

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$remove_key = $remove_keys[0];

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unset( $to_remove[ $remove_key ] );

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unset( $to_add[ $add_key ] );

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}

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* `delete_metadata` removes _all_ instances of the value, so only call once. Otherwise,

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* `delete_metadata` will return false for subsequent calls of the same value.

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* Use serialization to produce a predictable string that can be used by array_unique.

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$to_remove = array_map( 'maybe_unserialize', array_unique( array_map( 'maybe_serialize', $to_remove ) ) );

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foreach ( $to_remove as $value ) {

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if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {

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return new WP_Error(

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'rest_meta_database_error',

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/* translators: %s: Custom field key. */

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sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),

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array(

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'key' => $name,

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'status' => WP_Http::INTERNAL_SERVER_ERROR,

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)

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);

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}

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}

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foreach ( $to_add as $value ) {

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if ( ! add_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {

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return new WP_Error(

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'rest_meta_database_error',

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/* translators: %s: Custom field key. */

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sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),

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array(

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'key' => $name,

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'status' => WP_Http::INTERNAL_SERVER_ERROR,

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)

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);

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}

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}

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return true;

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}

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/**

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* Updates a meta value for an object.

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* @since 4.7.0

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* @param int $object_id Object ID to update.

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* @param string $meta_key Key for the custom field.

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* @param string $name Name for the field that is exposed in the REST API.

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* @param mixed $value Updated value.

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* @return true|WP_Error True if the meta field was updated, WP_Error otherwise.

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protected function update_meta_value( $object_id, $meta_key, $name, $value ) {

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$meta_type = $this->get_meta_type();

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// Do the exact same check for a duplicate value as in update_metadata() to avoid update_metadata() returning false.

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$old_value = get_metadata( $meta_type, $object_id, $meta_key );

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$subtype = get_object_subtype( $meta_type, $object_id );

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if ( is_array( $old_value ) && 1 === count( $old_value )

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&& $this->is_meta_value_same_as_stored_value( $meta_key, $subtype, $old_value[0], $value )

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) {

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return true;

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}

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if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {

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return new WP_Error(

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'rest_cannot_update',

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/* translators: %s: Custom field key. */

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sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),

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array(

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'key' => $name,

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'status' => rest_authorization_required_code(),

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)

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);

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}

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if ( ! update_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {

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return new WP_Error(

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'rest_meta_database_error',

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/* translators: %s: Custom field key. */

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sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),

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array(

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'key' => $name,

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'status' => WP_Http::INTERNAL_SERVER_ERROR,

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)

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);

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}

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return true;

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}

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/**

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* Checks if the user provided value is equivalent to a stored value for the given meta key.

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* @since 5.5.0

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* @param string $meta_key The meta key being checked.

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* @param string $subtype The object subtype.

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* @param mixed $stored_value The currently stored value retrieved from get_metadata().

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* @param mixed $user_value The value provided by the user.

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* @return bool

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protected function is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $user_value ) {

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$args = $this->get_registered_fields()[ $meta_key ];

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$sanitized = sanitize_meta( $meta_key, $user_value, $this->get_meta_type(), $subtype );

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if ( in_array( $args['type'], array( 'string', 'number', 'integer', 'boolean' ), true ) ) {

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// The return value of get_metadata will always be a string for scalar types.

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$sanitized = (string) $sanitized;

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}

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return $sanitized === $stored_value;

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}

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/**

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* Retrieves all the registered meta fields.

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[441] Fix | Delete

* @since 4.7.0

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* @return array Registered fields.

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protected function get_registered_fields() {

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$registered = array();

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$meta_type = $this->get_meta_type();

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$meta_subtype = $this->get_meta_subtype();

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$meta_keys = get_registered_meta_keys( $meta_type );

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if ( ! empty( $meta_subtype ) ) {

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$meta_keys = array_merge( $meta_keys, get_registered_meta_keys( $meta_type, $meta_subtype ) );

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}

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foreach ( $meta_keys as $name => $args ) {

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if ( empty( $args['show_in_rest'] ) ) {

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continue;

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}

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$rest_args = array();

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if ( is_array( $args['show_in_rest'] ) ) {

[464] Fix | Delete

$rest_args = $args['show_in_rest'];

[465] Fix | Delete

}

[466] Fix | Delete

[467] Fix | Delete

$default_args = array(

[468] Fix | Delete

'name' => $name,

[469] Fix | Delete

'single' => $args['single'],

[470] Fix | Delete

'type' => ! empty( $args['type'] ) ? $args['type'] : null,

[471] Fix | Delete

'schema' => array(),

[472] Fix | Delete

'prepare_callback' => array( $this, 'prepare_value' ),

[473] Fix | Delete

);

[474] Fix | Delete

[475] Fix | Delete

$default_schema = array(

[476] Fix | Delete

'type' => $default_args['type'],

[477] Fix | Delete

'description' => empty( $args['description'] ) ? '' : $args['description'],

[478] Fix | Delete

'default' => isset( $args['default'] ) ? $args['default'] : null,

[479] Fix | Delete

);

[480] Fix | Delete

[481] Fix | Delete

$rest_args = array_merge( $default_args, $rest_args );

[482] Fix | Delete

$rest_args['schema'] = array_merge( $default_schema, $rest_args['schema'] );

[483] Fix | Delete

[484] Fix | Delete

$type = ! empty( $rest_args['type'] ) ? $rest_args['type'] : null;

[485] Fix | Delete

$type = ! empty( $rest_args['schema']['type'] ) ? $rest_args['schema']['type'] : $type;

[486] Fix | Delete

[487] Fix | Delete

if ( null === $rest_args['schema']['default'] ) {

[488] Fix | Delete

$rest_args['schema']['default'] = static::get_empty_value_for_type( $type );

[489] Fix | Delete

}

[490] Fix | Delete

[491] Fix | Delete

$rest_args['schema'] = rest_default_additional_properties_to_false( $rest_args['schema'] );

[492] Fix | Delete

[493] Fix | Delete

if ( ! in_array( $type, array( 'string', 'boolean', 'integer', 'number', 'array', 'object' ), true ) ) {

[494] Fix | Delete

continue;

[495] Fix | Delete

}

[496] Fix | Delete

[497] Fix | Delete

if ( empty( $rest_args['single'] ) ) {

[498] Fix | Delete

$rest_args['schema'] = array(

[499] Fix | Delete