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/*
 * Copyright 2018 The gRPC Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.grpc.alts;

import io.grpc.BindableService;
import io.grpc.Channel;
import io.grpc.CompressorRegistry;
import io.grpc.DecompressorRegistry;
import io.grpc.ExperimentalApi;
import io.grpc.HandlerRegistry;
import io.grpc.Metadata;
import io.grpc.Server;
import io.grpc.ServerBuilder;
import io.grpc.ServerCall;
import io.grpc.ServerCall.Listener;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import io.grpc.ServerServiceDefinition;
import io.grpc.ServerStreamTracer.Factory;
import io.grpc.ServerTransportFilter;
import io.grpc.Status;
import io.grpc.alts.internal.AltsHandshakerOptions;
import io.grpc.alts.internal.AltsProtocolNegotiator;
import io.grpc.alts.internal.AltsProtocolNegotiator.LazyChannel;
import io.grpc.alts.internal.AltsTsiHandshaker;
import io.grpc.alts.internal.HandshakerServiceGrpc;
import io.grpc.alts.internal.RpcProtocolVersionsUtil;
import io.grpc.alts.internal.TsiHandshaker;
import io.grpc.alts.internal.TsiHandshakerFactory;
import io.grpc.internal.ObjectPool;
import io.grpc.internal.SharedResourcePool;
import io.grpc.netty.NettyServerBuilder;
import java.io.File;
import java.net.InetSocketAddress;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * gRPC secure server builder used for ALTS. This class adds on the necessary ALTS support to create
 * a production server on Google Cloud Platform.
 */
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/4151")
public final class AltsServerBuilder extends ServerBuilder {

  private static final Logger logger = Logger.getLogger(AltsServerBuilder.class.getName());
  private final NettyServerBuilder delegate;
  private ObjectPool handshakerChannelPool =
      SharedResourcePool.forResource(HandshakerServiceChannel.SHARED_HANDSHAKER_CHANNEL);
  private boolean enableUntrustedAlts;

  private AltsServerBuilder(NettyServerBuilder nettyDelegate) {
    this.delegate = nettyDelegate;
  }

  /** Creates a gRPC server builder for the given port. */
  public static AltsServerBuilder forPort(int port) {
    NettyServerBuilder nettyDelegate = NettyServerBuilder.forAddress(new InetSocketAddress(port));
    return new AltsServerBuilder(nettyDelegate);
  }

  /**
   * Enables untrusted ALTS for testing. If this function is called, we will not check whether ALTS
   * is running on Google Cloud Platform.
   */
  public AltsServerBuilder enableUntrustedAltsForTesting() {
    enableUntrustedAlts = true;
    return this;
  }

  /** Sets a new handshaker service address for testing. */
  public AltsServerBuilder setHandshakerAddressForTesting(String handshakerAddress) {
    // Instead of using the default shared channel to the handshaker service, create a separate
    // resource to the test address.
    handshakerChannelPool =
        SharedResourcePool.forResource(
            HandshakerServiceChannel.getHandshakerChannelForTesting(handshakerAddress));
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder handshakeTimeout(long timeout, TimeUnit unit) {
    delegate.handshakeTimeout(timeout, unit);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder directExecutor() {
    delegate.directExecutor();
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder addStreamTracerFactory(Factory factory) {
    delegate.addStreamTracerFactory(factory);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder addTransportFilter(ServerTransportFilter filter) {
    delegate.addTransportFilter(filter);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder executor(Executor executor) {
    delegate.executor(executor);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder addService(ServerServiceDefinition service) {
    delegate.addService(service);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder addService(BindableService bindableService) {
    delegate.addService(bindableService);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder fallbackHandlerRegistry(HandlerRegistry fallbackRegistry) {
    delegate.fallbackHandlerRegistry(fallbackRegistry);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder useTransportSecurity(File certChain, File privateKey) {
    throw new UnsupportedOperationException("Can't set TLS settings for ALTS");
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder decompressorRegistry(DecompressorRegistry registry) {
    delegate.decompressorRegistry(registry);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder compressorRegistry(CompressorRegistry registry) {
    delegate.compressorRegistry(registry);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public AltsServerBuilder intercept(ServerInterceptor interceptor) {
    delegate.intercept(interceptor);
    return this;
  }

  /** {@inheritDoc} */
  @Override
  public Server build() {
    if (!CheckGcpEnvironment.isOnGcp()) {
      if (enableUntrustedAlts) {
        logger.log(
            Level.WARNING,
            "Untrusted ALTS mode is enabled and we cannot guarantee the trustworthiness of the "
                + "ALTS handshaker service");
      } else {
        Status status =
            Status.INTERNAL.withDescription("ALTS is only allowed to run on Google Cloud Platform");
        delegate.intercept(new FailingServerInterceptor(status));
      }
    }

    final LazyChannel lazyHandshakerChannel = new LazyChannel(handshakerChannelPool);
    delegate.protocolNegotiator(
        AltsProtocolNegotiator.createServerNegotiator(
            new TsiHandshakerFactory() {
              @Override
              public TsiHandshaker newHandshaker(String authority) {
                return AltsTsiHandshaker.newServer(
                    HandshakerServiceGrpc.newStub(lazyHandshakerChannel.get()),
                    new AltsHandshakerOptions(RpcProtocolVersionsUtil.getRpcProtocolVersions()));
              }
            },
            lazyHandshakerChannel));
    return delegate.build();
  }

  /** An implementation of {@link ServerInterceptor} that fails each call. */
  static final class FailingServerInterceptor implements ServerInterceptor {

    private final Status status;

    public FailingServerInterceptor(Status status) {
      this.status = status;
    }

    @Override
    public  Listener interceptCall(
        ServerCall serverCall,
        Metadata metadata,
        ServerCallHandler nextHandler) {
      serverCall.close(status, new Metadata());
      return new Listener() {};
    }
  }
}