Feat: Add api_key argument to Client constructor

google/cloud/storage/client.py

@@ -108,6 +108,12 @@ class Client(ClientWithProject):
     :param extra_headers:
         (Optional) Custom headers to be sent with the requests attached to the client.
         For example, you can add custom audit logging headers.
+
+    :type api_key: string
+    :param api_key:
+        (Optional) An API key. Mutually exclusive with any other credentials.
+        This parameter is an alias for setting `client_options.api_key` and
+        will supercede any api key set in the `client_options` parameter.
     """
 
     SCOPE = (
@@ -126,6 +132,8 @@ def __init__(
         client_options=None,
         use_auth_w_custom_endpoint=True,
         extra_headers={},
+        *,
+        api_key=None,
     ):
         self._base_connection = None
 
@@ -146,6 +154,17 @@ def __init__(
 
         connection_kw_args = {"client_info": client_info}
 
+        # api_key should set client_options.api_key. Set it here whether
+        # client_options was specified as a dict, as a ClientOptions object, or
+        # None.
+        if api_key:
+            if client_options and not isinstance(client_options, dict):
+                client_options.api_key = api_key
+            else:
+                if not client_options:
+                    client_options = {}
+                client_options["api_key"] = api_key
+
         if client_options:
             if isinstance(client_options, dict):
                 client_options = google.api_core.client_options.from_dict(

setup.py

@@ -30,7 +30,7 @@
 dependencies = [
     "google-auth >= 2.26.1, < 3.0dev",
     "google-api-core >= 2.15.0, <3.0.0dev",
-    "google-cloud-core >= 2.3.0, < 3.0dev",
+    "google-cloud-core >= 2.4.2, < 3.0dev",
     # The dependency "google-resumable-media" is no longer used. However, the
     # dependency is still included here to accommodate users who may be
     # importing exception classes from the google-resumable-media without

tests/unit/test_client.py

@@ -191,6 +191,53 @@ def test_ctor_w_client_options_object(self):
         self.assertEqual(client._connection.API_BASE_URL, api_endpoint)
         self.assertEqual(client.api_endpoint, api_endpoint)
 
+    def test_ctor_w_api_key(self):
+        from google.auth.api_key import Credentials
+
+        PROJECT = "PROJECT"
+        api_key = "my_api_key"
+
+        client = self._make_one(project=PROJECT, api_key=api_key)
+
+        self.assertEqual(
+            client._connection.API_BASE_URL, client._connection.DEFAULT_API_ENDPOINT
+        )
+        self.assertIsInstance(client._credentials, Credentials)
+        self.assertEqual(client._credentials.token, api_key)
+
+    def test_ctor_w_api_key_and_client_options(self):
+        from google.auth.api_key import Credentials
+        from google.api_core.client_options import ClientOptions
+
+        PROJECT = "PROJECT"
+        api_key = "my_api_key"
+        api_endpoint = "https://www.foo-googleapis.com"
+        client_options = ClientOptions(api_endpoint=api_endpoint)
+
+        client = self._make_one(
+            project=PROJECT, client_options=client_options, api_key=api_key
+        )
+
+        self.assertEqual(client._connection.API_BASE_URL, api_endpoint)
+        self.assertIsInstance(client._credentials, Credentials)
+        self.assertEqual(client._credentials.token, api_key)
+
+    def test_ctor_w_api_key_and_client_dict(self):
+        from google.auth.api_key import Credentials
+
+        PROJECT = "PROJECT"
+        api_key = "my_api_key"
+        api_endpoint = "https://www.foo-googleapis.com"
+        client_options = {"api_endpoint": api_endpoint}
+
+        client = self._make_one(
+            project=PROJECT, client_options=client_options, api_key=api_key
+        )
+
+        self.assertEqual(client._connection.API_BASE_URL, api_endpoint)
+        self.assertIsInstance(client._credentials, Credentials)
+        self.assertEqual(client._credentials.token, api_key)
+
     def test_ctor_w_universe_domain_and_matched_credentials(self):
         PROJECT = "PROJECT"
         universe_domain = "example.com"