Core: Add 'google' auth type to auth manager (#13564)

Author: ebyhr

core/src/main/java/org/apache/iceberg/rest/auth/AuthManagers.java

@@ -95,6 +95,9 @@ public static AuthManager loadAuthManager(String name, Map<String, String> prope
       case AuthProperties.AUTH_TYPE_SIGV4:
         impl = AuthProperties.AUTH_MANAGER_IMPL_SIGV4;
         break;
+      case AuthProperties.AUTH_TYPE_GOOGLE:
+        impl = AuthProperties.AUTH_MANAGER_IMPL_GOOGLE;
+        break;
       case AuthProperties.AUTH_TYPE_OAUTH2:
         impl = AuthProperties.AUTH_MANAGER_IMPL_OAUTH2;
         break;

core/src/main/java/org/apache/iceberg/rest/auth/AuthProperties.java

@@ -28,6 +28,7 @@ private AuthProperties() {}
   public static final String AUTH_TYPE_BASIC = "basic";
   public static final String AUTH_TYPE_OAUTH2 = "oauth2";
   public static final String AUTH_TYPE_SIGV4 = "sigv4";
+  public static final String AUTH_TYPE_GOOGLE = "google";
 
   public static final String AUTH_MANAGER_IMPL_NONE =
       "org.apache.iceberg.rest.auth.NoopAuthManager";
@@ -37,6 +38,8 @@ private AuthProperties() {}
       "org.apache.iceberg.rest.auth.OAuth2Manager";
   public static final String AUTH_MANAGER_IMPL_SIGV4 =
       "org.apache.iceberg.aws.RESTSigV4AuthManager";
+  public static final String AUTH_MANAGER_IMPL_GOOGLE =
+      "org.apache.iceberg.gcp.auth.GoogleAuthManager";
 
   public static final String BASIC_USERNAME = "rest.auth.basic.username";
   public static final String BASIC_PASSWORD = "rest.auth.basic.password";

gcp/src/test/java/org/apache/iceberg/gcp/auth/TestGoogleAuthManager.java

@@ -40,6 +40,9 @@
 import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
 import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
 import org.apache.iceberg.rest.RESTClient;
+import org.apache.iceberg.rest.auth.AuthManager;
+import org.apache.iceberg.rest.auth.AuthManagers;
+import org.apache.iceberg.rest.auth.AuthProperties;
 import org.apache.iceberg.rest.auth.AuthSession;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
@@ -190,4 +193,12 @@ public void initSessionDelegatesToCatalogSession() {
     assertThat(resultSession).isSameAs(mockSession);
     verify(spyManager).catalogSession(restClient, props);
   }
+
+  @Test
+  public void testLoadAuthManager() {
+    AuthManager manager =
+        AuthManagers.loadAuthManager(
+            "test", Map.of(AuthProperties.AUTH_TYPE, AuthProperties.AUTH_TYPE_GOOGLE));
+    assertThat(manager).isInstanceOf(GoogleAuthManager.class);
+  }
 }