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package com.google.api.gax.grpc;

import com.google.api.core.BetaApi;
import com.google.common.base.Preconditions;
import io.grpc.CallCredentials;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.MethodDescriptor;

@BetaApi
class AuthInterceptor implements ClientInterceptor {
  private final CallCredentials credentials;

  public AuthInterceptor(CallCredentials credentials) {
    this.credentials = Preconditions.checkNotNull(credentials, "credentials");
  }

  @Override
  public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
      final MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, final Channel next) {
    return next.newCall(method, callOptions.withCallCredentials(credentials));
  }
}

@@ -2270,16 +2270,136 @@
 ) %7B%0A    
+if (callOptions.getCredentials() == null) %7B%0A      callOptions = callOptions.withCallCredentials(credentials);%0A    %7D%0A    
 return n
@@ -2433,41 +2433,8 @@
 ions
-.withCallCredentials(credentials)
 );%0A 

make AuthInterceptor honor old credentials (#313)