Log that the CallCredentials will be applied to all stubs automatically

Also hide the extraHeaders.values from
StaticSecurityHeaderCallCredentials.toString() to avoid writing
credentials to the log.

Author: ST-DDT

grpc-client-spring-boot-autoconfigure/src/main/java/net/devh/boot/grpc/client/autoconfigure/GrpcClientSecurityAutoConfiguration.java

@@ -24,6 +24,7 @@
 
 import io.grpc.CallCredentials;
 import io.grpc.stub.AbstractStub;
+import lombok.extern.slf4j.Slf4j;
 import net.devh.boot.grpc.client.inject.StubTransformer;
 import net.devh.boot.grpc.client.security.CallCredentialsHelper;
 
@@ -40,6 +41,7 @@
  *
  * @author Daniel Theuke ([email protected])
  */
+@Slf4j
 @Configuration(proxyBeanMethods = false)
 @AutoConfigureBefore(GrpcClientAutoConfiguration.class)
 public class GrpcClientSecurityAutoConfiguration {
@@ -60,6 +62,7 @@ public class GrpcClientSecurityAutoConfiguration {
     @ConditionalOnSingleCandidate(CallCredentials.class)
     @Bean
     StubTransformer stubCallCredentialsTransformer(final CallCredentials credentials) {
+        log.info("Found single CallCredentials in the context, automatically using it for all stubs");
         return CallCredentialsHelper.fixedCredentialsStubTransformer(credentials);
     }
 

grpc-client-spring-boot-autoconfigure/src/main/java/net/devh/boot/grpc/client/security/CallCredentialsHelper.java

@@ -266,7 +266,7 @@ public void thisUsesUnstableApi() {} // API evolution in progress
 
         @Override
         public String toString() {
-            return "StaticSecurityHeaderCallCredentials [extraHeaders=" + this.extraHeaders + "]";
+            return "StaticSecurityHeaderCallCredentials [extraHeaders.keys=" + this.extraHeaders.keys() + "]";
         }
 
     }