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Editing: rest-api.php

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<?php

add_action(
	'rest_api_init',
	static function () {
		$controller = new WPCF7_REST_Controller();
		$controller->register_routes();
	},
	10, 0
);

class WPCF7_REST_Controller {

const route_namespace = 'contact-form-7/v1';

public function register_routes() {

register_rest_route( self::route_namespace,
			'/contact-forms',
			array(
				array(
					'methods' => WP_REST_Server::READABLE,
					'callback' => array( $this, 'get_contact_forms' ),
					'permission_callback' => static function () {
						if ( current_user_can( 'wpcf7_read_contact_forms' ) ) {
							return true;
						} else {
							return new WP_Error( 'wpcf7_forbidden',
								__( 'You are not allowed to access contact forms.', 'contact-form-7' ),
								array( 'status' => 403 )
							);
						}
					},
				),
				array(
					'methods' => WP_REST_Server::CREATABLE,
					'callback' => array( $this, 'create_contact_form' ),
					'permission_callback' => static function () {
						if ( current_user_can( 'wpcf7_edit_contact_forms' ) ) {
							return true;
						} else {
							return new WP_Error( 'wpcf7_forbidden',
								__( 'You are not allowed to create a contact form.', 'contact-form-7' ),
								array( 'status' => 403 )
							);
						}
					},
				),
			)
		);

register_rest_route( self::route_namespace,
			'/contact-forms/(?P<id>\d+)',
			array(
				array(
					'methods' => WP_REST_Server::READABLE,
					'callback' => array( $this, 'get_contact_form' ),
					'permission_callback' => static function ( WP_REST_Request $request ) {
						$id = (int) $request->get_param( 'id' );

if ( current_user_can( 'wpcf7_edit_contact_form', $id ) ) {
							return true;
						} else {
							return new WP_Error( 'wpcf7_forbidden',
								__( 'You are not allowed to access the requested contact form.', 'contact-form-7' ),
								array( 'status' => 403 )
							);
						}
					},
				),
				array(
					'methods' => WP_REST_Server::EDITABLE,
					'callback' => array( $this, 'update_contact_form' ),
					'permission_callback' => static function ( WP_REST_Request $request ) {
						$id = (int) $request->get_param( 'id' );

if ( current_user_can( 'wpcf7_edit_contact_form', $id ) ) {
							return true;
						} else {
							return new WP_Error( 'wpcf7_forbidden',
								__( 'You are not allowed to access the requested contact form.', 'contact-form-7' ),
								array( 'status' => 403 )
							);
						}
					},
				),
				array(
					'methods' => WP_REST_Server::DELETABLE,
					'callback' => array( $this, 'delete_contact_form' ),
					'permission_callback' => static function ( WP_REST_Request $request ) {
						$id = (int) $request->get_param( 'id' );

if ( current_user_can( 'wpcf7_delete_contact_form', $id ) ) {
							return true;
						} else {
							return new WP_Error( 'wpcf7_forbidden',
								__( 'You are not allowed to access the requested contact form.', 'contact-form-7' ),
								array( 'status' => 403 )
							);
						}
					},
				),
			)
		);

register_rest_route( self::route_namespace,
			'/contact-forms/(?P<id>\d+)/feedback',
			array(
				array(
					'methods' => WP_REST_Server::CREATABLE,
					'callback' => array( $this, 'create_feedback' ),
					'permission_callback' => '__return_true',
				),
			)
		);

register_rest_route( self::route_namespace,
			'/contact-forms/(?P<id>\d+)/feedback/schema',
			array(
				array(
					'methods' => WP_REST_Server::READABLE,
					'callback' => array( $this, 'get_schema' ),
					'permission_callback' => '__return_true',
				),
				'schema' => 'wpcf7_swv_get_meta_schema',
			)
		);

register_rest_route( self::route_namespace,
			'/contact-forms/(?P<id>\d+)/refill',
			array(
				array(
					'methods' => WP_REST_Server::READABLE,
					'callback' => array( $this, 'get_refill' ),
					'permission_callback' => '__return_true',
				),
			)
		);
	}

public function get_contact_forms( WP_REST_Request $request ) {
		$args = array();

$per_page = $request->get_param( 'per_page' );

if ( null !== $per_page ) {
			$args['posts_per_page'] = (int) $per_page;
		}

$offset = $request->get_param( 'offset' );

if ( null !== $offset ) {
			$args['offset'] = (int) $offset;
		}

$order = $request->get_param( 'order' );

if ( null !== $order ) {
			$args['order'] = (string) $order;
		}

$orderby = $request->get_param( 'orderby' );

if ( null !== $orderby ) {
			$args['orderby'] = (string) $orderby;
		}

$search = $request->get_param( 'search' );

if ( null !== $search ) {
			$args['s'] = (string) $search;
		}

$items = WPCF7_ContactForm::find( $args );

$response = array();

foreach ( $items as $item ) {
			$response[] = array(
				'id' => $item->id(),
				'hash' => $item->hash(),
				'slug' => $item->name(),
				'title' => $item->title(),
				'locale' => $item->locale(),
			);
		}

return rest_ensure_response( $response );
	}

public function create_contact_form( WP_REST_Request $request ) {
		$id = (int) $request->get_param( 'id' );

if ( $id ) {
			return new WP_Error( 'wpcf7_post_exists',
				__( 'Cannot create existing contact form.', 'contact-form-7' ),
				array( 'status' => 400 )
			);
		}

$args = $request->get_params();
		$args['id'] = -1; // Create
		$context = $request->get_param( 'context' );
		$item = wpcf7_save_contact_form( $args, $context );

if ( ! $item ) {
			return new WP_Error( 'wpcf7_cannot_save',
				__( 'There was an error saving the contact form.', 'contact-form-7' ),
				array( 'status' => 500 )
			);
		}

$response = array(
			'id' => $item->id(),
			'slug' => $item->name(),
			'title' => $item->title(),
			'locale' => $item->locale(),
			'properties' => $this->get_properties( $item ),
			'config_errors' => array(),
		);

if ( wpcf7_validate_configuration() ) {
			$config_validator = new WPCF7_ConfigValidator( $item );
			$config_validator->validate();

$response['config_errors'] = $config_validator->collect_error_messages(
				array( 'decodes_html_entities' => true )
			);

if ( 'save' === $context ) {
				$config_validator->save();
			}
		}

return rest_ensure_response( $response );
	}

public function get_contact_form( WP_REST_Request $request ) {
		$id = (int) $request->get_param( 'id' );
		$item = wpcf7_contact_form( $id );

if ( ! $item ) {
			return new WP_Error( 'wpcf7_not_found',
				__( 'The requested contact form was not found.', 'contact-form-7' ),
				array( 'status' => 404 )
			);
		}

$response = array(
			'id' => $item->id(),
			'slug' => $item->name(),
			'title' => $item->title(),
			'locale' => $item->locale(),
			'properties' => $this->get_properties( $item ),
		);

return rest_ensure_response( $response );
	}

public function update_contact_form( WP_REST_Request $request ) {
		$id = (int) $request->get_param( 'id' );
		$item = wpcf7_contact_form( $id );

if ( ! $item ) {
			return new WP_Error( 'wpcf7_not_found',
				__( 'The requested contact form was not found.', 'contact-form-7' ),
				array( 'status' => 404 )
			);
		}

$args = $request->get_params();
		$context = $request->get_param( 'context' );
		$item = wpcf7_save_contact_form( $args, $context );

if ( ! $item ) {
			return new WP_Error( 'wpcf7_cannot_save',
				__( 'There was an error saving the contact form.', 'contact-form-7' ),
				array( 'status' => 500 )
			);
		}

if ( wpcf7_validate_configuration() ) {
			$config_validator = new WPCF7_ConfigValidator( $item );
			$config_validator->validate();

$response['config_errors'] = $config_validator->collect_error_messages(
				array( 'decodes_html_entities' => true )
			);

if ( 'save' === $context ) {
				$config_validator->save();
			}
		}

return rest_ensure_response( $response );
	}

public function delete_contact_form( WP_REST_Request $request ) {
		$id = (int) $request->get_param( 'id' );
		$item = wpcf7_contact_form( $id );

if ( ! $item ) {
			return new WP_Error( 'wpcf7_not_found',
				__( 'The requested contact form was not found.', 'contact-form-7' ),
				array( 'status' => 404 )
			);
		}

$result = $item->delete();

if ( ! $result ) {
			return new WP_Error( 'wpcf7_cannot_delete',
				__( 'There was an error deleting the contact form.', 'contact-form-7' ),
				array( 'status' => 500 )
			);
		}

$response = array( 'deleted' => true );

return rest_ensure_response( $response );
	}

public function create_feedback( WP_REST_Request $request ) {
		$content_type = $request->get_header( 'Content-Type' ) ?? '';

if ( ! str_starts_with( $content_type, 'multipart/form-data' ) ) {
			return new WP_Error( 'wpcf7_unsupported_media_type',
				__( 'The request payload format is not supported.', 'contact-form-7' ),
				array( 'status' => 415 )
			);
		}

$url_params = $request->get_url_params();

$item = null;

if ( ! empty( $url_params['id'] ) ) {
			$item = wpcf7_contact_form( $url_params['id'] );
		}

if ( ! $item ) {
			return new WP_Error( 'wpcf7_not_found',
				__( 'The requested contact form was not found.', 'contact-form-7' ),
				array( 'status' => 404 )
			);
		}

$unit_tag = wpcf7_sanitize_unit_tag(
			$request->get_param( '_wpcf7_unit_tag' )
		);

if ( empty( $unit_tag ) ) {
			return new WP_Error( 'wpcf7_unit_tag_not_found',
				__( 'There is no valid unit tag.', 'contact-form-7' ),
				array( 'status' => 400 )
			);
		}

$result = $item->submit();

$response = array_merge( $result, array(
			'into' => sprintf( '#%s', $unit_tag ),
			'invalid_fields' => array(),
		) );

if ( ! empty( $result['invalid_fields'] ) ) {
			$invalid_fields = array();

foreach ( (array) $result['invalid_fields'] as $name => $field ) {
				if ( ! wpcf7_is_name( $name ) ) {
					continue;
				}

$name = strtr( $name, '.', '_' );

$invalid_fields[] = array(
					'field' => $name,
					'message' => $field['reason'],
					'idref' => $field['idref'],
					'error_id' => sprintf(
						'%1$s-ve-%2$s',
						$unit_tag,
						$name
					),
				);
			}

$response['invalid_fields'] = $invalid_fields;
		}

$response = wpcf7_apply_filters_deprecated(
			'wpcf7_ajax_json_echo',
			array( $response, $result ),
			'5.2',
			'wpcf7_feedback_response'
		);

$response = apply_filters( 'wpcf7_feedback_response', $response, $result );

return rest_ensure_response( $response );
	}

public function get_schema( WP_REST_Request $request ) {
		$url_params = $request->get_url_params();

$item = null;

if ( ! empty( $url_params['id'] ) ) {
			$item = wpcf7_contact_form( $url_params['id'] );
		}

if ( ! $item ) {
			return new WP_Error( 'wpcf7_not_found',
				__( 'The requested contact form was not found.', 'contact-form-7' ),
				array( 'status' => 404 )
			);
		}

$schema = $item->get_schema();

$response = isset( $schema ) ? $schema->to_array() : array();

return rest_ensure_response( $response );
	}

public function get_refill( WP_REST_Request $request ) {
		$id = (int) $request->get_param( 'id' );
		$item = wpcf7_contact_form( $id );

if ( ! $item ) {
			return new WP_Error( 'wpcf7_not_found',
				__( 'The requested contact form was not found.', 'contact-form-7' ),
				array( 'status' => 404 )
			);
		}

$response = wpcf7_apply_filters_deprecated(
			'wpcf7_ajax_onload',
			array( array() ),
			'5.2',
			'wpcf7_refill_response'
		);

$response = apply_filters( 'wpcf7_refill_response', array() );

return rest_ensure_response( $response );
	}

private function get_properties( WPCF7_ContactForm $contact_form ) {
		$properties = $contact_form->get_properties();

$properties['form'] = array(
			'content' => (string) $properties['form'],
			'fields' => array_map(
				static function ( WPCF7_FormTag $form_tag ) {
					return array(
						'type' => $form_tag->type,
						'basetype' => $form_tag->basetype,
						'name' => $form_tag->name,
						'options' => $form_tag->options,
						'raw_values' => $form_tag->raw_values,
						'labels' => $form_tag->labels,
						'values' => $form_tag->values,
						'pipes' => $form_tag->pipes instanceof WPCF7_Pipes
							? $form_tag->pipes->to_array()
							: $form_tag->pipes,
						'content' => $form_tag->content,
					);
				},
				$contact_form->scan_form_tags()
			),
		);

$properties['additional_settings'] = array(
			'content' => (string) $properties['additional_settings'],
			'settings' => array_filter( array_map(
				static function ( $setting ) {
					$pattern = '/^([a-zA-Z0-9_]+)[\t ]*:(.*)$/';

if ( preg_match( $pattern, $setting, $matches ) ) {
						$name = trim( $matches[1] );
						$value = trim( $matches[2] );

if ( in_array( $value, array( 'on', 'true' ), true ) ) {
							$value = true;
						} elseif ( in_array( $value, array( 'off', 'false' ), true ) ) {
							$value = false;
						}

return array( $name, $value );
					}

return false;
				},
				explode( "\n", $properties['additional_settings'] )
			) ),
		);

return $properties;
	}

private function get_argument_schema() {
		return array(
			'id' => array(
				'description' => __( 'Unique identifier for the contact form.', 'contact-form-7' ),
				'type' => 'integer',
				'required' => true,
			),
		);
	}

}

Editing: rest-api.php

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