<?php

/**

 * WP_Application_Passwords class

 *

 * @package WordPress

 * @since   5.6.0

 */

/**

 * Class for displaying, modifying, and sanitizing application passwords.

 *

 * @package WordPress

 */

class WP_Application_Passwords {

	/**

	 * The application passwords user meta key.

	 *

	 * @since 5.6.0

	 *

	 * @var string

	 */

	const USERMETA_KEY_APPLICATION_PASSWORDS = '_application_passwords';

	/**

	 *

	 * @since 5.6.0

	 *

	 * @var string

	 */

	const OPTION_KEY_IN_USE = 'using_application_passwords';

	/**

	 * The generated application password length.

	 *

	 * @since 5.6.0

	 *

	 * @var int

	 */

	const PW_LENGTH = 24;

	/**

	 *

	 *

	 * @since 5.6.0

	 *

	 * @return bool

	 */

	public static function is_in_use() {

		$network_id = get_main_network_id();

		return (bool) get_network_option( $network_id, self::OPTION_KEY_IN_USE );

	}

	/**

	 * Creates a new application password.

	 *

	 * @since 5.6.0

	 * @since 5.7.0 Returns WP_Error if application name already exists.

	 *

	 * @param int   $user_id  User ID.

	 * @param array $args     {

	 *     Arguments used to create the application password.

	 *

	 *     @type string $name   The name of the application password.

	 *     @type string $app_id A UUID provided by the application to uniquely identify it.

	 * }

	 */

	public static function create_new_application_password( $user_id, $args = array() ) {

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

			$args['name'] = sanitize_text_field( $args['name'] );

		}

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

			return new WP_Error( 'application_password_empty_name', __( 'An application name is required to create an application password.' ), array( 'status' => 400 ) );

		}

		if ( self::application_name_exists_for_user( $user_id, $args['name'] ) ) {

			return new WP_Error( 'application_password_duplicate_name', __( 'Each application name should be unique.' ), array( 'status' => 409 ) );

		}

		$new_password    = wp_generate_password( static::PW_LENGTH, false );

		$hashed_password = wp_hash_password( $new_password );

		$new_item = array(

			'uuid'      => wp_generate_uuid4(),

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

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

			'password'  => $hashed_password,

			'created'   => time(),

			'last_used' => null,

			'last_ip'   => null,

		);

		$passwords   = static::get_user_application_passwords( $user_id );

		$passwords[] = $new_item;

		$saved       = static::set_user_application_passwords( $user_id, $passwords );

		if ( ! $saved ) {

			return new WP_Error( 'db_error', __( 'Could not save application password.' ) );

		}

		$network_id = get_main_network_id();

		if ( ! get_network_option( $network_id, self::OPTION_KEY_IN_USE ) ) {

			update_network_option( $network_id, self::OPTION_KEY_IN_USE, true );

		}

		/**

		 * Fires when an application password is created.

		 *

		 * @since 5.6.0

		 *

		 * @param int    $user_id      The user ID.

		 * @param array  $new_item     {

		 *     The details about the created password.

		 *

		 *     @type string $uuid      The unique identifier for the application password.

		 *     @type string $app_id    A UUID provided by the application to uniquely identify it.

		 *     @type string $name      The name of the application password.

		 *     @type string $password  A one-way hash of the password.

		 *     @type int    $created   Unix timestamp of when the password was created.

		 *     @type null   $last_used Null.

		 *     @type null   $last_ip   Null.

		 * }

		 * @param string $new_password The unhashed generated application password.

		 * @param array  $args         {

		 *     Arguments used to create the application password.

		 *

		 *     @type string $name   The name of the application password.

		 *     @type string $app_id A UUID provided by the application to uniquely identify it.

		 * }

		 */

		do_action( 'wp_create_application_password', $user_id, $new_item, $new_password, $args );

		return array( $new_password, $new_item );

	}

	/**

	 * Gets a user's application passwords.

	 *

	 * @since 5.6.0

	 *

	 * @param int $user_id User ID.

	 * @return array {

	 *     The list of app passwords.

	 *

	 *     @type array ...$0 {

	 *         @type string      $uuid      The unique identifier for the application password.

	 *         @type string      $app_id    A UUID provided by the application to uniquely identify it.

	 *         @type string      $name      The name of the application password.

	 *         @type string      $password  A one-way hash of the password.

	 *         @type int         $created   Unix timestamp of when the password was created.

	 *         @type int|null    $last_used The Unix timestamp of the GMT date the application password was last used.

	 *         @type string|null $last_ip   The IP address the application password was last used by.

	 *     }

	 * }

	 */

	public static function get_user_application_passwords( $user_id ) {

		$passwords = get_user_meta( $user_id, static::USERMETA_KEY_APPLICATION_PASSWORDS, true );

		if ( ! is_array( $passwords ) ) {

			return array();

		}

		$save = false;

		foreach ( $passwords as $i => $password ) {

			if ( ! isset( $password['uuid'] ) ) {

				$passwords[ $i ]['uuid'] = wp_generate_uuid4();

				$save                    = true;

			}

		}

		if ( $save ) {

			static::set_user_application_passwords( $user_id, $passwords );

		}

		return $passwords;

	}

	/**

	 * Gets a user's application password with the given UUID.

	 *

	 * @since 5.6.0

	 *

	 * @param int    $user_id User ID.

	 * @param string $uuid    The password's UUID.

	 * @return array|null The application password if found, null otherwise.

	 */

	public static function get_user_application_password( $user_id, $uuid ) {

		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as $password ) {

			if ( $password['uuid'] === $uuid ) {

				return $password;

			}

		}

		return null;

	}

	/**

	 * Checks if an application password with the given name exists for this user.

	 *

	 * @since 5.7.0

	 *

	 * @param int    $user_id User ID.

	 * @param string $name    Application name.

	 * @return bool Whether the provided application name exists.

	 */

	public static function application_name_exists_for_user( $user_id, $name ) {

		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as $password ) {

			if ( strtolower( $password['name'] ) === strtolower( $name ) ) {

				return true;

			}

		}

		return false;

	}

	/**

	 * Updates an application password.

	 *

	 * @since 5.6.0

	 *

	 * @param int    $user_id User ID.

	 * @param string $uuid    The password's UUID.

	 * @param array  $update  Information about the application password to update.

	 * @return true|WP_Error True if successful, otherwise a WP_Error instance is returned on error.

	 */

	public static function update_application_password( $user_id, $uuid, $update = array() ) {

		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as &$item ) {

			if ( $item['uuid'] !== $uuid ) {

				continue;

			}

			if ( ! empty( $update['name'] ) ) {

				$update['name'] = sanitize_text_field( $update['name'] );

			}

			$save = false;

			if ( ! empty( $update['name'] ) && $item['name'] !== $update['name'] ) {

				$item['name'] = $update['name'];

				$save         = true;

			}

			if ( $save ) {

				$saved = static::set_user_application_passwords( $user_id, $passwords );

				if ( ! $saved ) {

					return new WP_Error( 'db_error', __( 'Could not save application password.' ) );

				}

			}

			/**

			 * Fires when an application password is updated.

			 *

			 * @since 5.6.0

			 *

			 * @param int   $user_id The user ID.

			 * @param array $item    The updated app password details.

			 * @param array $update  The information to update.

			 */

			do_action( 'wp_update_application_password', $user_id, $item, $update );

			return true;

		}

		return new WP_Error( 'application_password_not_found', __( 'Could not find an application password with that id.' ) );

	}

	/**

	 * Records that an application password has been used.

	 *

	 * @since 5.6.0

	 *

	 * @param int    $user_id User ID.

	 * @param string $uuid    The password's UUID.

	 * @return true|WP_Error True if the usage was recorded, a WP_Error if an error occurs.

	 */

	public static function record_application_password_usage( $user_id, $uuid ) {

		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as &$password ) {

			if ( $password['uuid'] !== $uuid ) {

				continue;

			}

			// Only record activity once a day.

			if ( $password['last_used'] + DAY_IN_SECONDS > time() ) {

				return true;

			}

			$password['last_used'] = time();

			$password['last_ip']   = $_SERVER['REMOTE_ADDR'];

			$saved = static::set_user_application_passwords( $user_id, $passwords );

			if ( ! $saved ) {

				return new WP_Error( 'db_error', __( 'Could not save application password.' ) );

			}

			return true;

		}

		return new WP_Error( 'application_password_not_found', __( 'Could not find an application password with that id.' ) );

	}

	/**

	 * Deletes an application password.

	 *

	 * @since 5.6.0

	 *

	 * @param int    $user_id User ID.

	 * @param string $uuid    The password's UUID.

	 * @return true|WP_Error Whether the password was successfully found and deleted, a WP_Error otherwise.

	 */

	public static function delete_application_password( $user_id, $uuid ) {

		$passwords = static::get_user_application_passwords( $user_id );

		foreach ( $passwords as $key => $item ) {

			if ( $item['uuid'] === $uuid ) {

				unset( $passwords[ $key ] );

				$saved = static::set_user_application_passwords( $user_id, $passwords );

				if ( ! $saved ) {

					return new WP_Error( 'db_error', __( 'Could not delete application password.' ) );

				}

				/**

				 * Fires when an application password is deleted.

				 *

				 * @since 5.6.0

				 *

				 * @param int   $user_id The user ID.

				 * @param array $item    The data about the application password.

				 */

				do_action( 'wp_delete_application_password', $user_id, $item );

				return true;

			}

		}

		return new WP_Error( 'application_password_not_found', __( 'Could not find an application password with that id.' ) );

	}

	/**

	 * Deletes all application passwords for the given user.

	 *

	 * @since 5.6.0

	 *

	 * @param int $user_id User ID.

	 * @return int|WP_Error The number of passwords that were deleted or a WP_Error on failure.

	 */

	public static function delete_all_application_passwords( $user_id ) {

		$passwords = static::get_user_application_passwords( $user_id );

		if ( $passwords ) {

			$saved = static::set_user_application_passwords( $user_id, array() );

			if ( ! $saved ) {

				return new WP_Error( 'db_error', __( 'Could not delete application passwords.' ) );

			}

			foreach ( $passwords as $item ) {

				/** This action is documented in wp-includes/class-wp-application-passwords.php */

				do_action( 'wp_delete_application_password', $user_id, $item );

			}

			return count( $passwords );

		}

		return 0;

	}

	/**

	 * Sets a user's application passwords.

	 *

	 * @since 5.6.0

	 *

	 * @param int   $user_id   User ID.

	 * @param array $passwords Application passwords.

	 *

	 * @return bool

	 */

	protected static function set_user_application_passwords( $user_id, $passwords ) {

		return update_user_meta( $user_id, static::USERMETA_KEY_APPLICATION_PASSWORDS, $passwords );

	}

	/**

	 * Sanitizes and then splits a password into smaller chunks.

	 *

	 * @since 5.6.0

	 *

	 * @param string $raw_password The raw application password.

	 * @return string The chunked password.

	 */

	public static function chunk_password( $raw_password ) {

		$raw_password = preg_replace( '/[^a-z\d]/i', '', $raw_password );

		return trim( chunk_split( $raw_password, 4, ' ' ) );

	}

}