ChallengeBody __getattr__ proxy

letsencrypt/acme/messages2.py

@@ -167,6 +167,9 @@ class ChallengeBody(ResourceBody):
        such as ``challb`` to distinguish instanced of this class from
        ``achall``.
 
+    :ivar letsencrypt.acme.challenges.Challenge: Wrapped challenge.
+        Conveniently, all challenge fields are proxied, i.e. you can
+        call ``challb.x`` to get ``challb.chall.x`` contents.
     :ivar letsencrypt.acme.messages2.Status status:
     :ivar datetime.datetime validated:
 
@@ -187,6 +190,9 @@ class ChallengeBody(ResourceBody):
         jobj_fields['chall'] = challenges.Challenge.from_json(jobj)
         return jobj_fields
 
+    def __getattr__(self, name):
+        return getattr(self.chall, name)
+
 
 class AuthorizationResource(Resource):
     """Authorization Resource.

letsencrypt/acme/messages2_test.py

@@ -103,6 +103,9 @@ class ChallengeBodyTest(unittest.TestCase):
         from letsencrypt.acme.messages2 import ChallengeBody
         self.assertEqual(self.challb, ChallengeBody.from_json(self.jobj_from))
 
+    def test_getattr_proxy(self):
+        self.assertEqual('foo', self.challb.token)
+
 
 class AuthorizationTest(unittest.TestCase):
     """Tests for letsencrypt.acme.messages2.Authorization."""

letsencrypt/client/achallenges.py

@@ -26,10 +26,13 @@ from letsencrypt.client import crypto_util
 class AnnotatedChallenge(jose_util.ImmutableMap):
     """Client annotated challenge.
 
-    Wraps around :class:`~letsencrypt.acme.challenges.Challenge` and
-    annotates with data useful for the client.
+    Wraps around server provided challenge and annotates with data
+    useful for the client.
+
+    :ivar chall: Wrapped `~.ChallengeBody` (or just `~.challenges.Challenge`).
 
     """
+    __slots__ = ('chall',)
     acme_type = NotImplemented
 
     def __getattr__(self, name):