<?php
  
  namespace Illuminate\Contracts\Auth;
  
  interface UserProvider
  {
      /**
       * Retrieve a user by their unique identifier.
       *
       * @param  mixed  $identifier
       * @return \Illuminate\Contracts\Auth\Authenticatable|null
       */
      public function retrieveById($identifier);
  
      /**
       * Retrieve a user by their unique identifier and "remember me" token.
       *
       * @param  mixed  $identifier
       * @param  string  $token
       * @return \Illuminate\Contracts\Auth\Authenticatable|null
       */
      public function retrieveByToken($identifier, $token);
  
      /**
       * Update the "remember me" token for the given user in storage.
       *
       * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
       * @param  string  $token
       * @return void
       */
      public function updateRememberToken(Authenticatable $user, $token);
  
      /**
       * Retrieve a user by the given credentials.
       *
       * @param  array  $credentials
       * @return \Illuminate\Contracts\Auth\Authenticatable|null
       */
      public function retrieveByCredentials(array $credentials);
  
      /**
       * Validate a user against the given credentials.
       *
       * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
       * @param  array  $credentials
       * @return bool
       */
      public function validateCredentials(Authenticatable $user, array $credentials);
  }