<?php
/**
 * Takes over the rules of the plugin "Disable REST API" (slug disable-json-api).
 *
 * @package ThreeDoor
 */

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

/**
 * Converts the disable_rest_api_options option into our settings.
 */
class ThreeDoor_Import {

	const SOURCE_OPTION = 'disable_rest_api_options';

	/**
	 * Whether there is anything to import.
	 *
	 * @return bool
	 */
	public static function available() {
		$source = get_option( self::SOURCE_OPTION );
		return is_array( $source ) && ! empty( $source['roles'] );
	}

	/**
	 * Settings with the rules of Disable REST API applied. Does not save.
	 *
	 * Disable REST API stores per role a default (default_allow) and a list of route regexes
	 * mapped to true (allowed) or false (blocked). The role "none" stands for guests.
	 *
	 * @param array $settings Current settings.
	 * @return array
	 */
	public static function from_disable_rest_api( array $settings ) {
		$source = get_option( self::SOURCE_OPTION );
		if ( ! is_array( $source ) || empty( $source['roles'] ) ) {
			return $settings;
		}
		foreach ( (array) $source['roles'] as $role => $rule ) {
			$policy = array(
				'default' => ! empty( $rule['default_allow'] ) ? 'allow' : 'deny',
				'allow'   => array(),
				'deny'    => array(),
			);
			foreach ( isset( $rule['allow_list'] ) ? (array) $rule['allow_list'] : array() as $route => $allowed ) {
				$policy[ $allowed ? 'allow' : 'deny' ][] = self::pattern( (string) $route );
			}
			$policy['allow'] = array_values( array_unique( $policy['allow'] ) );
			$policy['deny']  = array_values( array_unique( $policy['deny'] ) );
			if ( 'none' === $role ) {
				$settings['guest'] = $policy;
			} else {
				$settings['roles'][ sanitize_key( $role ) ] = $policy;
			}
		}
		return $settings;
	}

	/**
	 * Turn a registered route regex into our pattern: every named group becomes *.
	 *
	 * @param string $route Route regex, possibly HTML-encoded as Disable REST API stores it.
	 * @return string
	 */
	public static function pattern( $route ) {
		$route = htmlspecialchars_decode( $route );
		$route = preg_replace( '/\(\?P<[^>]+>[^)]*\)/', '*', $route );
		$route = str_replace( array( '\\.', '\\-', '\\/' ), array( '.', '-', '/' ), (string) $route );
		return '/' . ltrim( (string) $route, '/' );
	}
}