api: add fallback for proxies < 0.12 which send authorization without b64

azure-pipelines.yml

@@ -248,6 +248,7 @@ stages:
             inputs:
               script: |
                 docker stop $(docker ps -aq)
+                docker container prune -f
           - task: CmdLine@2
             displayName: Prepare unittests and coverage for upload
             inputs:

passbook/api/auth.py

@@ -22,7 +22,13 @@ def token_from_header(raw_header: bytes) -> Optional[Token]:
                 "Unsupported authentication type, denying", type=auth_type.lower()
             )
             return None
-    auth_credentials = b64decode(auth_credentials.encode()).decode()
+    try:
+        auth_credentials = b64decode(auth_credentials.encode()).decode()
+    except UnicodeDecodeError:
+        # TODO: Remove this workaround
+        # temporary fallback for 0.11 to 0.12 upgrade
+        # 0.11 and below proxy sends authorization header not base64 encoded
+        auth_credentials = auth_credentials
     # Accept credentials with username and without
     if ":" in auth_credentials:
         _, password = auth_credentials.split(":")