docs: def get_user_profile(self, auth_secret):
          """Get the profile (i.e., username, password, etc.) of a user.
  
          Parameters
          ----------
          auth_secret: str
              The authentication secret of the logged-in user.
  
          Returns
          -------
          bool
              True if the logout is successful, False otherwise.
          result
              A dict containing the following keys:
  
              -  USERNAME_KEY
              -  PASSWORD_HASH_KEY
              -  AUTH_KEY
  
              if the user profile is obtained successfully; otherwise a dict
              containing the error string with the key ERROR_KEY.
  
          Note
          ----
          Possible error strings are listed as below:
  
          -  ERROR_NOT_LOGGED_IN
          """
          result = {pytwis_constants.ERROR_KEY: None}
  
          # Check if the user is logged in.
          loggedin, userid = self._is_loggedin(auth_secret)
          if not loggedin:
              result[pytwis_constants.ERROR_KEY] = \
                  pytwis_constants.ERROR_NOT_LOGGED_IN
              return (False, result)
  
          userid_profile_key = pytwis_constants.USER_PROFILE_KEY_FORMAT.format(userid)
          result = self._rc.hgetall(userid_profile_key)
  
          return (True, result)