<?php

/**

 * Error Protection API: WP_Recovery_Mode_Key_Service class

 *

 * @package WordPress

 * @since   5.2.0

 */

/**

 * Core class used to generate and validate keys used to enter Recovery Mode.

 *

 * @since 5.2.0

 */

final class WP_Recovery_Mode_Key_Service {

	/**

	 * The option name used to store the keys.

	 *

	 * @since 5.2.0

	 * @var string

	 */

	private $option_name = 'recovery_keys';

	/**

	 * Creates a recovery mode token.

	 *

	 * @since 5.2.0

	 *

	 * @return string $token A random string to identify its associated key in storage.

	 */

	public function generate_recovery_mode_token() {

		return wp_generate_password( 22, false );

	}

	/**

	 * Creates a recovery mode key.

	 *

	 * @since 5.2.0

	 *

	 * @global PasswordHash $wp_hasher

	 *

	 * @param string $token A token generated by {@see generate_recovery_mode_token()}.

	 * @return string $key Recovery mode key.

	 */

	public function generate_and_store_recovery_mode_key( $token ) {

		global $wp_hasher;

		$key = wp_generate_password( 22, false );

		if ( empty( $wp_hasher ) ) {

			require_once ABSPATH . WPINC . '/class-phpass.php';

			$wp_hasher = new PasswordHash( 8, true );

		}

		$hashed = $wp_hasher->HashPassword( $key );

		$records = $this->get_keys();

		$records[ $token ] = array(

			'hashed_key' => $hashed,

			'created_at' => time(),

		);

		$this->update_keys( $records );

		/**

		 * Fires when a recovery mode key is generated.

		 *

		 * @since 5.2.0

		 *

		 * @param string $token The recovery data token.

		 * @param string $key   The recovery mode key.

		 */

		do_action( 'generate_recovery_mode_key', $token, $key );

		return $key;

	}

	/**

	 * Verifies if the recovery mode key is correct.

	 *

	 * Recovery mode keys can only be used once; the key will be consumed in the process.

	 *

	 * @since 5.2.0

	 *

	 * @param string $token The token used when generating the given key.

	 * @param string $key   The unhashed key.

	 * @param int    $ttl   Time in seconds for the key to be valid for.

	 * @return true|WP_Error True on success, error object on failure.

	 */

	public function validate_recovery_mode_key( $token, $key, $ttl ) {

		$records = $this->get_keys();

		if ( ! isset( $records[ $token ] ) ) {

			return new WP_Error( 'token_not_found', __( 'Recovery Mode not initialized.' ) );

		}

		$record = $records[ $token ];

		$this->remove_key( $token );

		if ( ! is_array( $record ) || ! isset( $record['hashed_key'], $record['created_at'] ) ) {

			return new WP_Error( 'invalid_recovery_key_format', __( 'Invalid recovery key format.' ) );

		}

		if ( ! wp_check_password( $key, $record['hashed_key'] ) ) {

			return new WP_Error( 'hash_mismatch', __( 'Invalid recovery key.' ) );

		}

		if ( time() > $record['created_at'] + $ttl ) {

			return new WP_Error( 'key_expired', __( 'Recovery key expired.' ) );

		}

		return true;

	}

	/**

	 * Removes expired recovery mode keys.

	 *

	 * @since 5.2.0

	 *

	 * @param int $ttl Time in seconds for the keys to be valid for.

	 */

	public function clean_expired_keys( $ttl ) {

		$records = $this->get_keys();

		foreach ( $records as $key => $record ) {

			if ( ! isset( $record['created_at'] ) || time() > $record['created_at'] + $ttl ) {

				unset( $records[ $key ] );

			}

		}

		$this->update_keys( $records );

	}

	/**

	 * Removes a used recovery key.

	 *

	 * @since 5.2.0

	 *

	 * @param string $token The token used when generating a recovery mode key.

	 */

	private function remove_key( $token ) {

		$records = $this->get_keys();

		if ( ! isset( $records[ $token ] ) ) {

			return;

		}

		unset( $records[ $token ] );

		$this->update_keys( $records );

	}

	/**

	 * Gets the recovery key records.

	 *

	 * @since 5.2.0

	 *

	 * @return array Associative array of $token => $data pairs, where $data has keys 'hashed_key'

	 *               and 'created_at'.

	 */

	private function get_keys() {

		return (array) get_option( $this->option_name, array() );

	}

	/**

	 * Updates the recovery key records.

	 *

	 * @since 5.2.0

	 *

	 * @param array $keys Associative array of $token => $data pairs, where $data has keys 'hashed_key'

	 *                    and 'created_at'.

	 * @return bool True on success, false on failure.

	 */

	private function update_keys( array $keys ) {

		return update_option( $this->option_name, $keys );

	}

}