Fix #627

Docker-py couldn't pull private images if the account have non ascii chars
in either user or password. It that case an exception ending with no auth
credentials.
Instead docker client (golang) don't suffer this issue.

Also add a test to check the login or password even with non ascii char have
a valid auth dictionary
Signed-off-by: Alejandro Brito Monedero <abrito@alea-soluciones.com>

docker/auth/auth.py

@@ -96,7 +96,7 @@ def decode_auth(auth):
         auth = auth.encode('ascii')
     s = base64.b64decode(auth)
     login, pwd = s.split(b':', 1)
-    return login.decode('ascii'), pwd.decode('ascii')
+    return login.decode('utf8'), pwd.decode('utf8')
 
 
 def encode_header(auth):

tests/unit/auth_test.py

@@ -316,3 +316,33 @@ class LoadConfigTest(base.Cleanup, base.BaseTestCase):
             self.assertEqual(cfg['password'], 'izayoi')
             self.assertEqual(cfg['email'], 'sakuya@scarlet.net')
             self.assertEqual(cfg.get('auth'), None)
+
+    def test_load_config_custom_config_env_utf8(self):
+        folder = tempfile.mkdtemp()
+        self.addCleanup(shutil.rmtree, folder)
+
+        dockercfg_path = os.path.join(folder, 'config.json')
+        registry = 'https://your.private.registry.io'
+        auth_ = base64.b64encode(
+            b'sakuya\xc3\xa6:izayoi\xc3\xa6').decode('ascii')
+        config = {
+            'auths': {
+                registry: {
+                    'auth': '{0}'.format(auth_),
+                    'email': 'sakuya@scarlet.net'
+                }
+            }
+        }
+
+        with open(dockercfg_path, 'w') as f:
+            json.dump(config, f)
+
+        with mock.patch.dict(os.environ, {'DOCKER_CONFIG': folder}):
+            cfg = auth.load_config(None)
+            assert registry in cfg
+            self.assertNotEqual(cfg[registry], None)
+            cfg = cfg[registry]
+            self.assertEqual(cfg['username'], b'sakuya\xc3\xa6'.decode('utf8'))
+            self.assertEqual(cfg['password'], b'izayoi\xc3\xa6'.decode('utf8'))
+            self.assertEqual(cfg['email'], 'sakuya@scarlet.net')
+            self.assertEqual(cfg.get('auth'), None)