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Editing: class.wpcom-json-api-get-option-endpoint.php

<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName

use Automattic\Jetpack\Sync\Defaults;

if ( ! defined( 'ABSPATH' ) ) {
	exit( 0 );
}

/**
 * Get option endpoint.
 *
 * @phan-constructor-used-for-side-effects
 */
class WPCOM_JSON_API_Get_Option_Endpoint extends Jetpack_JSON_API_Endpoint {
	/**
	 * This endpoint allows authentication both via a blog and a user token.
	 * If a user token is used, that user should have `manage_options` capability.
	 *
	 * @var array|string
	 */
	protected $needed_capabilities = 'manage_options';

/**
	 * Options name.
	 *
	 * @var string
	 */
	public $option_name;

/**
	 * Site option.
	 *
	 * @var string
	 */
	public $site_option;

/**
	 * Endpoint callback.
	 *
	 * @return array
	 */
	public function result() {
		if ( $this->site_option ) {
			return array( 'option_value' => get_site_option( $this->option_name ) );
		}
		return array( 'option_value' => get_option( $this->option_name ) );
	}

/**
	 * Validate the input.
	 *
	 * @param object $object - unused, for parent class compatability.
	 *
	 * @return bool|WP_Error
	 */
	public function validate_input( $object ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		$query_args        = $this->query_args();
		$this->option_name = isset( $query_args['option_name'] ) ? $query_args['option_name'] : false;
		if ( ! $this->option_name ) {
			return new WP_Error( 'option_name_not_set', __( 'You must specify an option_name', 'jetpack' ) );
		}
		$this->site_option = isset( $query_args['site_option'] ) ? $query_args['site_option'] : false;

/**
		 * Filter the list of options that are manageable via the JSON API.
		 *
		 * @module json-api
		 *
		 * @since 3.8.2
		 *
		 * @param array The default list of site options.
		 * @param bool Is the option a site option.
		 */
		if ( ! in_array( $this->option_name, apply_filters( 'jetpack_options_whitelist', Defaults::$default_options_whitelist, $this->site_option ), true ) ) {
			return new WP_Error( 'option_name_not_in_whitelist', __( 'You must specify a whitelisted option_name', 'jetpack' ) );
		}
		return true;
	}
}

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