[sonic-package-manager] fix registry requests failing when no service…

… field in Bearer fields (sonic-net#1921)

Signed-off-by: Stepan Blyschak stepanb@nvidia.com

What I did
If Auth service did not reply with "service" field, don't fail and request the token without it.

How I did it
Modified registry.py and added UT.

How to verify it
Tested on DUT.

setup.py

@@ -209,6 +209,7 @@
     ],
     tests_require = [
         'pyfakefs',
+        'responses',
         'pytest',
         'mockredispy>=2.9.3',
         'deepdiff==5.2.3'

sonic_package_manager/registry.py

@@ -23,28 +23,29 @@ class AuthenticationService:
     """ AuthenticationService provides an authentication tokens. """
 
     @staticmethod
-    def get_token(realm, service, scope) -> str:
+    def get_token(bearer: Dict) -> str:
         """ Retrieve an authentication token.
 
         Args:
-            realm: Realm: url to request token.
-            service: service to request token for.
-            scope: scope to requests token for.
+            bearer: Bearer token.
         Returns:
             token value as a string.
         """
 
-        log.debug(f'getting authentication token: realm={realm} service={service} scope={scope}')
+        log.debug(f'getting authentication token {bearer}')
+        if 'realm' not in bearer:
+            raise AuthenticationServiceError(f'Realm is required in bearer')
 
-        response = requests.get(f'{realm}?scope={scope}&service={service}')
+        url = bearer.pop('realm')
+        response = requests.get(url, params=bearer)
         if response.status_code != requests.codes.ok:
             raise AuthenticationServiceError('Failed to retrieve token')
 
         content = json.loads(response.content)
         token = content['token']
         expires_in = content['expires_in']
 
-        log.debug(f'authentication token for realm={realm} service={service} scope={scope}: '
+        log.debug(f'authentication token for bearer={bearer}: '
                   f'token={token} expires_in={expires_in}')
 
         return token
@@ -85,7 +86,7 @@ def _execute_get_request(url, headers):
             log.debug(f'unauthorized: retrieving authentication details '
                       f'from response headers {www_authenticate_details}')
             bearer = www_authenticate.parse(www_authenticate_details)['bearer']
-            token = AuthenticationService.get_token(**bearer)
+            token = AuthenticationService.get_token(bearer)
             headers['Authorization'] = f'Bearer {token}'
             # Repeat request
             response = requests.get(url, headers=headers)

tests/sonic_package_manager/test_registry.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+import requests
+import responses
 from sonic_package_manager.registry import RegistryResolver
 
 
@@ -13,3 +15,22 @@ def test_get_registry_for():
     assert registry.url == 'https://registry-server:5000'
     registry = resolver.get_registry_for('registry-server.com/docker')
     assert registry.url == 'https://registry-server.com'
+
+
+@responses.activate
+def test_registry_auth():
+    resolver = RegistryResolver()
+    registry = resolver.get_registry_for('registry-server:5000/docker')
+    responses.add(responses.GET, registry.url + '/v2/docker/tags/list',
+                  headers={
+                      'www-authenticate': 'Bearer realm="https://auth.docker.io/token",scope="repository:library/docker:pull,push"'
+                  },
+                  status=requests.codes.unauthorized)
+    responses.add(responses.GET,
+                  'https://auth.docker.io/token?scope=repository:library/docker:pull,push',
+                  json={'token': 'a', 'expires_in': '100'},
+                  status=requests.codes.ok)
+    responses.add(responses.GET, registry.url + '/v2/docker/tags/list',
+                  json={'tags': ['a', 'b']},
+                  status=requests.codes.ok)
+    assert registry.tags('registry-server:5000/docker') == ['a', 'b']