feat: enable self signed JWT for http (#850)

Author: arithmetic1728

src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java

@@ -215,6 +215,16 @@ protected MethodDefinition createDefaultCredentialsProviderBuilderMethod() {
             .setArguments(DEFAULT_SERVICE_SCOPES_VAR_EXPR)
             .setReturnType(returnType)
             .build();
+    // enable self signed JWT.
+    credsProviderBuilderExpr =
+            MethodInvocationExpr.builder()
+                    .setExprReferenceExpr(credsProviderBuilderExpr)
+                    .setMethodName("setUseJwtAccessWithScope")
+                    .setArguments(
+                            ValueExpr.withValue(
+                                    PrimitiveValue.builder().setType(TypeNode.BOOLEAN).setValue("true").build()))
+                    .setReturnType(returnType)
+                    .build();
     return MethodDefinition.builder()
         .setHeaderCommentStatements(
             SettingsCommentComposer.DEFAULT_CREDENTIALS_PROVIDER_BUILDER_METHOD_COMMENT)

src/main/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposer.java

@@ -14,21 +14,16 @@
 
 package com.google.api.generator.gapic.composer.grpc;
 
-import com.google.api.gax.core.GoogleCredentialsProvider;
 import com.google.api.gax.grpc.GaxGrpcProperties;
 import com.google.api.gax.grpc.GrpcTransportChannel;
 import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
-import com.google.api.generator.engine.ast.ConcreteReference;
 import com.google.api.generator.engine.ast.Expr;
 import com.google.api.generator.engine.ast.MethodDefinition;
 import com.google.api.generator.engine.ast.MethodInvocationExpr;
-import com.google.api.generator.engine.ast.PrimitiveValue;
 import com.google.api.generator.engine.ast.ScopeNode;
 import com.google.api.generator.engine.ast.TypeNode;
-import com.google.api.generator.engine.ast.ValueExpr;
 import com.google.api.generator.engine.ast.Variable;
 import com.google.api.generator.engine.ast.VariableExpr;
-import com.google.api.generator.gapic.composer.comment.SettingsCommentComposer;
 import com.google.api.generator.gapic.composer.common.AbstractServiceStubSettingsClassComposer;
 import com.google.api.generator.gapic.composer.store.TypeStore;
 import com.google.api.generator.gapic.model.Service;
@@ -74,47 +69,6 @@ protected Expr initializeTransportProviderBuilder(
         .build();
   }
 
-  @Override
-  protected MethodDefinition createDefaultCredentialsProviderBuilderMethod() {
-    TypeNode returnType =
-        TypeNode.withReference(
-            ConcreteReference.withClazz(GoogleCredentialsProvider.Builder.class));
-    MethodInvocationExpr credsProviderBuilderExpr =
-        MethodInvocationExpr.builder()
-            .setStaticReferenceType(FIXED_TYPESTORE.get("GoogleCredentialsProvider"))
-            .setMethodName("newBuilder")
-            .build();
-    credsProviderBuilderExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(credsProviderBuilderExpr)
-            .setMethodName("setScopesToApply")
-            .setArguments(DEFAULT_SERVICE_SCOPES_VAR_EXPR)
-            .setReturnType(returnType)
-            .build();
-
-    // This section is specific to GAPIC clients. It sets UseJwtAccessWithScope value to true to
-    // enable self signed JWT feature.
-    credsProviderBuilderExpr =
-        MethodInvocationExpr.builder()
-            .setExprReferenceExpr(credsProviderBuilderExpr)
-            .setMethodName("setUseJwtAccessWithScope")
-            .setArguments(
-                ValueExpr.withValue(
-                    PrimitiveValue.builder().setType(TypeNode.BOOLEAN).setValue("true").build()))
-            .setReturnType(returnType)
-            .build();
-
-    return MethodDefinition.builder()
-        .setHeaderCommentStatements(
-            SettingsCommentComposer.DEFAULT_CREDENTIALS_PROVIDER_BUILDER_METHOD_COMMENT)
-        .setScope(ScopeNode.PUBLIC)
-        .setIsStatic(true)
-        .setReturnType(returnType)
-        .setName("defaultCredentialsProviderBuilder")
-        .setReturnExpr(credsProviderBuilderExpr)
-        .build();
-  }
-
   @Override
   protected List<MethodDefinition> createApiClientHeaderProviderBuilderMethods(
       Service service, TypeStore typeStore) {

src/test/java/com/google/api/generator/gapic/composer/rest/goldens/ComplianceStubSettings.golden

@@ -135,7 +135,9 @@ public class ComplianceStubSettings extends StubSettings<ComplianceStubSettings>
 
   /** Returns a builder for the default credentials for this service. */
   public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
-    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
   }
 
   /** Returns a builder for the default ChannelProvider for this service. */

test/integration/goldens/compute/com/google/cloud/compute/v1/stub/AddressesStubSettings.java

@@ -287,7 +287,9 @@ public static List<String> getDefaultServiceScopes() {
 
   /** Returns a builder for the default credentials for this service. */
   public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
-    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
   }
 
   /** Returns a builder for the default ChannelProvider for this service. */

test/integration/goldens/compute/com/google/cloud/compute/v1/stub/RegionOperationsStubSettings.java

@@ -125,7 +125,9 @@ public static List<String> getDefaultServiceScopes() {
 
   /** Returns a builder for the default credentials for this service. */
   public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
-    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
   }
 
   /** Returns a builder for the default ChannelProvider for this service. */