pekko/akka-docs/rst/scala/http/routing-dsl/directives/security-directives/authenticateBasicAsync.rst
2016-01-14 00:31:03 +01:00

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.. _-authenticateBasicAsync-:
authenticateBasicAsync
======================
Signature
---------
.. includecode:: /../../akka-http/src/main/scala/akka/http/scaladsl/server/directives/SecurityDirectives.scala#async-authenticator
.. includecode2:: /../../akka-http/src/main/scala/akka/http/scaladsl/server/directives/SecurityDirectives.scala
:snippet: authenticateBasicAsync
Description
-----------
Wraps the inner route with Http Basic authentication support using a given ``AsyncAuthenticator[T]``.
This variant of the :ref:`-authenticateBasic-` directive returns a ``Future[Option[T]]`` which allows freeing up the routing
layer of Akka HTTP, freeing it for other requests. It should be used whenever an authentication is expected to take
a longer amount of time (e.g. looking up the user in a database).
In case the returned option is ``None`` the request is rejected with a :class:`AuthenticationFailedRejection`,
which by default is mapped to an ``401 Unauthorized`` response.
Standard HTTP-based authentication which uses the ``WWW-Authenticate`` header containing challenge data and
``Authorization`` header for receiving credentials is implemented in subclasses of ``HttpAuthenticator``.
See :ref:`credentials-and-timing-attacks-scala` for details about verifying the secret.
.. warning::
Make sure to use basic authentication only over SSL/TLS because credentials are transferred in plaintext.
.. _HTTP Basic Authentication: https://en.wikipedia.org/wiki/Basic_auth
Example
-------
.. includecode2:: ../../../../code/docs/http/scaladsl/server/directives/SecurityDirectivesExamplesSpec.scala
:snippet: authenticateBasicAsync-0