chore: resolve comments

Author: boikoa-gl

firebase_admin/fpnv.py

@@ -178,7 +178,6 @@ def _validate_headers(self, headers: Any) -> None:
     def _validate_payload(self, token: str, signing_key: str) -> Dict[str, Any]:
         """Decodes and verifies the token."""
         expected_issuer = f'{_FPNV_ISSUER}{self._project_id}'
-        payload = {}
         try:
             payload = jwt.decode(
                 token,
@@ -210,8 +209,6 @@ def _validate_payload(self, token: str, signing_key: str) -> Dict[str, Any]:
                 f'Decoding FPNV token failed. Error: {exception}'
             ) from exception
 
-        if not payload.get('iss').startswith(_FPNV_ISSUER):
-            raise ValueError('Token does not contain the correct "iss" (issuer).')
         _Validators.check_string(
             'The provided FPNV token "sub" (subject) claim',
             payload.get('sub'))

tests/test_fpnv.py

@@ -25,13 +25,9 @@
 
 # Mock Data
 _PROJECT_ID = 'mock-project-id'
-_FPNV_TOKEN = 'fpnv_token_string'
 _EXP_TIMESTAMP = 2000000000
 _ISSUER = f'https://fpnv.googleapis.com/projects/{_PROJECT_ID}'
-_JWKS_URL = 'https://fpnv.googleapis.com/v1beta/jwks'
 _PHONE_NUMBER = '+1234567890'
-_ISSUER_PREFIX = 'https://fpnv.googleapis.com/projects/'
-_PRIVATE_KEY = 'test-private-key'  # In real tests, use a real RSA/EC private key
 _PUBLIC_KEY = 'test-public-key'  # In real tests, use the corresponding public key
 
 _MOCK_PAYLOAD = {