feat: add api key support (#147)

* chore: upgrade gapic-generator-java, gax-java and gapic-generator-python

PiperOrigin-RevId: 423842556

Source-Link: googleapis/googleapis@a616ca0

Source-Link: https://github.com/googleapis/googleapis-gen/commit/29b938c58c1e51d019f2ee539d55dc0a3c86a905
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* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

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google/cloud/iam_credentials_v1/services/iam_credentials/async_client.py

@@ -16,7 +16,7 @@
 from collections import OrderedDict
 import functools
 import re
-from typing import Dict, Sequence, Tuple, Type, Union
+from typing import Dict, Optional, Sequence, Tuple, Type, Union
 import pkg_resources
 
 from google.api_core.client_options import ClientOptions
@@ -119,6 +119,42 @@ def from_service_account_file(cls, filename: str, *args, **kwargs):
 
     from_service_account_json = from_service_account_file
 
+    @classmethod
+    def get_mtls_endpoint_and_cert_source(
+        cls, client_options: Optional[ClientOptions] = None
+    ):
+        """Return the API endpoint and client cert source for mutual TLS.
+
+        The client cert source is determined in the following order:
+        (1) if `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is not "true", the
+        client cert source is None.
+        (2) if `client_options.client_cert_source` is provided, use the provided one; if the
+        default client cert source exists, use the default one; otherwise the client cert
+        source is None.
+
+        The API endpoint is determined in the following order:
+        (1) if `client_options.api_endpoint` if provided, use the provided one.
+        (2) if `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is "always", use the
+        default mTLS endpoint; if the environment variabel is "never", use the default API
+        endpoint; otherwise if client cert source exists, use the default mTLS endpoint, otherwise
+        use the default API endpoint.
+
+        More details can be found at https://google.aip.dev/auth/4114.
+
+        Args:
+            client_options (google.api_core.client_options.ClientOptions): Custom options for the
+                client. Only the `api_endpoint` and `client_cert_source` properties may be used
+                in this method.
+
+        Returns:
+            Tuple[str, Callable[[], Tuple[bytes, bytes]]]: returns the API endpoint and the
+                client cert source to use.
+
+        Raises:
+            google.auth.exceptions.MutualTLSChannelError: If any errors happen.
+        """
+        return IAMCredentialsClient.get_mtls_endpoint_and_cert_source(client_options)  # type: ignore
+
     @property
     def transport(self) -> IAMCredentialsTransport:
         """Returns the transport used by the client instance.

google/cloud/iam_credentials_v1/services/iam_credentials/client.py

@@ -245,6 +245,73 @@ def parse_common_location_path(path: str) -> Dict[str, str]:
         m = re.match(r"^projects/(?P<project>.+?)/locations/(?P<location>.+?)$", path)
         return m.groupdict() if m else {}
 
+    @classmethod
+    def get_mtls_endpoint_and_cert_source(
+        cls, client_options: Optional[client_options_lib.ClientOptions] = None
+    ):
+        """Return the API endpoint and client cert source for mutual TLS.
+
+        The client cert source is determined in the following order:
+        (1) if `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is not "true", the
+        client cert source is None.
+        (2) if `client_options.client_cert_source` is provided, use the provided one; if the
+        default client cert source exists, use the default one; otherwise the client cert
+        source is None.
+
+        The API endpoint is determined in the following order:
+        (1) if `client_options.api_endpoint` if provided, use the provided one.
+        (2) if `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is "always", use the
+        default mTLS endpoint; if the environment variabel is "never", use the default API
+        endpoint; otherwise if client cert source exists, use the default mTLS endpoint, otherwise
+        use the default API endpoint.
+
+        More details can be found at https://google.aip.dev/auth/4114.
+
+        Args:
+            client_options (google.api_core.client_options.ClientOptions): Custom options for the
+                client. Only the `api_endpoint` and `client_cert_source` properties may be used
+                in this method.
+
+        Returns:
+            Tuple[str, Callable[[], Tuple[bytes, bytes]]]: returns the API endpoint and the
+                client cert source to use.
+
+        Raises:
+            google.auth.exceptions.MutualTLSChannelError: If any errors happen.
+        """
+        if client_options is None:
+            client_options = client_options_lib.ClientOptions()
+        use_client_cert = os.getenv("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false")
+        use_mtls_endpoint = os.getenv("GOOGLE_API_USE_MTLS_ENDPOINT", "auto")
+        if use_client_cert not in ("true", "false"):
+            raise ValueError(
+                "Environment variable `GOOGLE_API_USE_CLIENT_CERTIFICATE` must be either `true` or `false`"
+            )
+        if use_mtls_endpoint not in ("auto", "never", "always"):
+            raise MutualTLSChannelError(
+                "Environment variable `GOOGLE_API_USE_MTLS_ENDPOINT` must be `never`, `auto` or `always`"
+            )
+
+        # Figure out the client cert source to use.
+        client_cert_source = None
+        if use_client_cert == "true":
+            if client_options.client_cert_source:
+                client_cert_source = client_options.client_cert_source
+            elif mtls.has_default_client_cert_source():
+                client_cert_source = mtls.default_client_cert_source()
+
+        # Figure out which api endpoint to use.
+        if client_options.api_endpoint is not None:
+            api_endpoint = client_options.api_endpoint
+        elif use_mtls_endpoint == "always" or (
+            use_mtls_endpoint == "auto" and client_cert_source
+        ):
+            api_endpoint = cls.DEFAULT_MTLS_ENDPOINT
+        else:
+            api_endpoint = cls.DEFAULT_ENDPOINT
+
+        return api_endpoint, client_cert_source
+
     def __init__(
         self,
         *,
@@ -295,57 +362,22 @@ def __init__(
         if client_options is None:
             client_options = client_options_lib.ClientOptions()
 
-        # Create SSL credentials for mutual TLS if needed.
-        if os.getenv("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false") not in (
-            "true",
-            "false",
-        ):
-            raise ValueError(
-                "Environment variable `GOOGLE_API_USE_CLIENT_CERTIFICATE` must be either `true` or `false`"
-            )
-        use_client_cert = (
-            os.getenv("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false") == "true"
+        api_endpoint, client_cert_source_func = self.get_mtls_endpoint_and_cert_source(
+            client_options
         )
 
-        client_cert_source_func = None
-        is_mtls = False
-        if use_client_cert:
-            if client_options.client_cert_source:
-                is_mtls = True
-                client_cert_source_func = client_options.client_cert_source
-            else:
-                is_mtls = mtls.has_default_client_cert_source()
-                if is_mtls:
-                    client_cert_source_func = mtls.default_client_cert_source()
-                else:
-                    client_cert_source_func = None
-
-        # Figure out which api endpoint to use.
-        if client_options.api_endpoint is not None:
-            api_endpoint = client_options.api_endpoint
-        else:
-            use_mtls_env = os.getenv("GOOGLE_API_USE_MTLS_ENDPOINT", "auto")
-            if use_mtls_env == "never":
-                api_endpoint = self.DEFAULT_ENDPOINT
-            elif use_mtls_env == "always":
-                api_endpoint = self.DEFAULT_MTLS_ENDPOINT
-            elif use_mtls_env == "auto":
-                if is_mtls:
-                    api_endpoint = self.DEFAULT_MTLS_ENDPOINT
-                else:
-                    api_endpoint = self.DEFAULT_ENDPOINT
-            else:
-                raise MutualTLSChannelError(
-                    "Unsupported GOOGLE_API_USE_MTLS_ENDPOINT value. Accepted "
-                    "values: never, auto, always"
-                )
+        api_key_value = getattr(client_options, "api_key", None)
+        if api_key_value and credentials:
+            raise ValueError(
+                "client_options.api_key and credentials are mutually exclusive"
+            )
 
         # Save or instantiate the transport.
         # Ordinarily, we provide the transport, but allowing a custom transport
         # instance provides an extensibility point for unusual situations.
         if isinstance(transport, IAMCredentialsTransport):
             # transport is a IAMCredentialsTransport instance.
-            if credentials or client_options.credentials_file:
+            if credentials or client_options.credentials_file or api_key_value:
                 raise ValueError(
                     "When providing a transport instance, "
                     "provide its credentials directly."
@@ -357,6 +389,15 @@ def __init__(
                 )
             self._transport = transport
         else:
+            import google.auth._default  # type: ignore
+
+            if api_key_value and hasattr(
+                google.auth._default, "get_api_key_credentials"
+            ):
+                credentials = google.auth._default.get_api_key_credentials(
+                    api_key_value
+                )
+
             Transport = type(self).get_transport_class(transport)
             self._transport = Transport(
                 credentials=credentials,

tests/unit/gapic/iam_credentials_v1/test_iam_credentials.py

@@ -400,6 +400,87 @@ def test_iam_credentials_client_mtls_env_auto(
                 )
 
 
+@pytest.mark.parametrize(
+    "client_class", [IAMCredentialsClient, IAMCredentialsAsyncClient]
+)
+@mock.patch.object(
+    IAMCredentialsClient,
+    "DEFAULT_ENDPOINT",
+    modify_default_endpoint(IAMCredentialsClient),
+)
+@mock.patch.object(
+    IAMCredentialsAsyncClient,
+    "DEFAULT_ENDPOINT",
+    modify_default_endpoint(IAMCredentialsAsyncClient),
+)
+def test_iam_credentials_client_get_mtls_endpoint_and_cert_source(client_class):
+    mock_client_cert_source = mock.Mock()
+
+    # Test the case GOOGLE_API_USE_CLIENT_CERTIFICATE is "true".
+    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"}):
+        mock_api_endpoint = "foo"
+        options = client_options.ClientOptions(
+            client_cert_source=mock_client_cert_source, api_endpoint=mock_api_endpoint
+        )
+        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source(
+            options
+        )
+        assert api_endpoint == mock_api_endpoint
+        assert cert_source == mock_client_cert_source
+
+    # Test the case GOOGLE_API_USE_CLIENT_CERTIFICATE is "false".
+    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "false"}):
+        mock_client_cert_source = mock.Mock()
+        mock_api_endpoint = "foo"
+        options = client_options.ClientOptions(
+            client_cert_source=mock_client_cert_source, api_endpoint=mock_api_endpoint
+        )
+        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source(
+            options
+        )
+        assert api_endpoint == mock_api_endpoint
+        assert cert_source is None
+
+    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "never".
+    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "never"}):
+        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source()
+        assert api_endpoint == client_class.DEFAULT_ENDPOINT
+        assert cert_source is None
+
+    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "always".
+    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_MTLS_ENDPOINT": "always"}):
+        api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source()
+        assert api_endpoint == client_class.DEFAULT_MTLS_ENDPOINT
+        assert cert_source is None
+
+    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "auto" and default cert doesn't exist.
+    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"}):
+        with mock.patch(
+            "google.auth.transport.mtls.has_default_client_cert_source",
+            return_value=False,
+        ):
+            api_endpoint, cert_source = client_class.get_mtls_endpoint_and_cert_source()
+            assert api_endpoint == client_class.DEFAULT_ENDPOINT
+            assert cert_source is None
+
+    # Test the case GOOGLE_API_USE_MTLS_ENDPOINT is "auto" and default cert exists.
+    with mock.patch.dict(os.environ, {"GOOGLE_API_USE_CLIENT_CERTIFICATE": "true"}):
+        with mock.patch(
+            "google.auth.transport.mtls.has_default_client_cert_source",
+            return_value=True,
+        ):
+            with mock.patch(
+                "google.auth.transport.mtls.default_client_cert_source",
+                return_value=mock_client_cert_source,
+            ):
+                (
+                    api_endpoint,
+                    cert_source,
+                ) = client_class.get_mtls_endpoint_and_cert_source()
+                assert api_endpoint == client_class.DEFAULT_MTLS_ENDPOINT
+                assert cert_source == mock_client_cert_source
+
+
 @pytest.mark.parametrize(
     "client_class,transport_class,transport_name",
     [
@@ -1464,6 +1545,23 @@ def test_credentials_transport_error():
             transport=transport,
         )
 
+    # It is an error to provide an api_key and a transport instance.
+    transport = transports.IAMCredentialsGrpcTransport(
+        credentials=ga_credentials.AnonymousCredentials(),
+    )
+    options = client_options.ClientOptions()
+    options.api_key = "api_key"
+    with pytest.raises(ValueError):
+        client = IAMCredentialsClient(client_options=options, transport=transport,)
+
+    # It is an error to provide an api_key and a credential.
+    options = mock.Mock()
+    options.api_key = "api_key"
+    with pytest.raises(ValueError):
+        client = IAMCredentialsClient(
+            client_options=options, credentials=ga_credentials.AnonymousCredentials()
+        )
+
     # It is an error to provide scopes and a transport instance.
     transport = transports.IAMCredentialsGrpcTransport(
         credentials=ga_credentials.AnonymousCredentials(),
@@ -2024,3 +2122,33 @@ def test_client_ctx():
             with client:
                 pass
             close.assert_called()
+
+
+@pytest.mark.parametrize(
+    "client_class,transport_class",
+    [
+        (IAMCredentialsClient, transports.IAMCredentialsGrpcTransport),
+        (IAMCredentialsAsyncClient, transports.IAMCredentialsGrpcAsyncIOTransport),
+    ],
+)
+def test_api_key_credentials(client_class, transport_class):
+    with mock.patch.object(
+        google.auth._default, "get_api_key_credentials", create=True
+    ) as get_api_key_credentials:
+        mock_cred = mock.Mock()
+        get_api_key_credentials.return_value = mock_cred
+        options = client_options.ClientOptions()
+        options.api_key = "api_key"
+        with mock.patch.object(transport_class, "__init__") as patched:
+            patched.return_value = None
+            client = client_class(client_options=options)
+            patched.assert_called_once_with(
+                credentials=mock_cred,
+                credentials_file=None,
+                host=client.DEFAULT_ENDPOINT,
+                scopes=None,
+                client_cert_source_for_mtls=None,
+                quota_project_id=None,
+                client_info=transports.base.DEFAULT_CLIENT_INFO,
+                always_use_jwt_access=True,
+            )