Update resolve_authconfig to bring it in line with Docker client

Instead of expanding the registry name we're looking for to a full URL,
strip entries in the authconfig down to just the hostname.

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

docker/auth/auth.py

@@ -26,14 +26,6 @@ INDEX_URL = 'https://index.docker.io/v1/'
 DOCKER_CONFIG_FILENAME = '.dockercfg'
 
 
-def swap_protocol(url):
-    if url.startswith('http://'):
-        return url.replace('http://', 'https://', 1)
-    if url.startswith('https://'):
-        return url.replace('https://', 'http://', 1)
-    return url
-
-
 def expand_registry_url(hostname, insecure=False):
     if hostname.startswith('http:') or hostname.startswith('https:'):
         return hostname
@@ -68,29 +60,29 @@ def resolve_repository_name(repo_name, insecure=False):
 
 
 def resolve_authconfig(authconfig, registry=None):
-    """Return the authentication data from the given auth configuration for a
-    specific registry. We'll do our best to infer the correct URL for the
-    registry, trying both http and https schemes. Returns an empty dictionnary
-    if no data exists."""
+    """
+    Returns the authentication data from the given auth configuration for a
+    specific registry. As with the Docker client, legacy entries in the config
+    with full URLs are stripped down to hostnames before checking for a match.
+    Returns None if no match was found.
+    """
     # Default to the public index server
-    registry = registry or INDEX_URL
-
-    # If it's not the index server there are three cases:
-    #
-    # 1. this is a full config url -> it should be used as is
-    # 2. it could be a full url, but with the wrong protocol
-    # 3. it can be the hostname optionally with a port
-    #
-    # as there is only one auth entry which is fully qualified we need to start
-    # parsing and matching
-    if '/v1/' not in registry:
-        registry = os.path.join(registry, 'v1/')
-    if not registry.startswith('http:') and not registry.startswith('https:'):
-        registry = 'https://' + registry
+    registry = convert_to_hostname(registry) if registry else INDEX_URL
 
     if registry in authconfig:
         return authconfig[registry]
-    return authconfig.get(swap_protocol(registry), None)
+
+    for key, config in six.iteritems(authconfig):
+        if convert_to_hostname(key) == registry:
+            return config
+
+    return None
+
+
+def convert_to_hostname(url):
+    url = url.replace('http://', '')
+    url = url.replace('https://', '')
+    return url.split('/', 1)[0]
 
 
 def encode_auth(auth_info):

docker/client.py

@@ -627,8 +627,7 @@ class Client(requests.Session):
         elif not self._auth_configs:
             self._auth_configs = auth.load_config()
 
-        registry = auth.expand_registry_url(registry, insecure_registry) \
-            if registry else auth.INDEX_URL
+        registry = registry or auth.INDEX_URL
 
         authcfg = auth.resolve_authconfig(self._auth_configs, registry)
         # If we found an existing auth config for this registry and username

tests/utils_test.py

@@ -104,7 +104,8 @@ class UtilsTest(unittest.TestCase):
     def test_resolve_authconfig(self):
         auth_config = {
             'https://index.docker.io/v1/': {'auth': 'indexuser'},
-            'http://my.registry.net/v1/': {'auth': 'privateuser'}
+            'my.registry.net': {'auth': 'privateuser'},
+            'http://legacy.registry.url/v1/': {'auth': 'legacyauth'}
         }
         # hostname only
         self.assertEqual(
@@ -154,6 +155,15 @@ class UtilsTest(unittest.TestCase):
             resolve_authconfig(auth_config, 'http://my.registry.net/v1/'),
             {'auth': 'privateuser'}
         )
+        # legacy entry in config
+        self.assertEqual(
+            resolve_authconfig(auth_config, 'legacy.registry.url'),
+            {'auth': 'legacyauth'}
+        )
+        # no matching entry
+        self.assertTrue(
+            resolve_authconfig(auth_config, 'does.not.exist') is None
+        )
 
 
 if __name__ == '__main__':