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/*
 * Copyright (C) 2023-2024 Thomas Akehurst
 *
 * 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 org.wiremock.grpc.internal;

import com.github.tomakehurst.wiremock.common.Exceptions;
import com.github.tomakehurst.wiremock.core.Options;
import com.github.tomakehurst.wiremock.http.AdminRequestHandler;
import com.github.tomakehurst.wiremock.http.HttpServer;
import com.github.tomakehurst.wiremock.http.HttpServerFactory;
import com.github.tomakehurst.wiremock.http.StubRequestHandler;
import com.github.tomakehurst.wiremock.jetty11.Jetty11HttpServer;
import com.github.tomakehurst.wiremock.store.BlobStore;
import com.google.protobuf.DescriptorProtos;
import com.google.protobuf.Descriptors;
import jakarta.servlet.DispatcherType;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.Optional;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ServletContextHandler;

public class GrpcHttpServerFactory implements HttpServerFactory {

  private final BlobStore protoDescriptorStore;
  private GrpcFilter grpcFilter;

  public GrpcHttpServerFactory(BlobStore protoDescriptorStore) {
    this.protoDescriptorStore = protoDescriptorStore;
  }

  public void loadFileDescriptors() {
    List fileDescriptors = new ArrayList<>();
    protoDescriptorStore
        .getAllKeys()
        .filter(key -> key.endsWith(".dsc") || key.endsWith(".desc"))
        .map(
            key ->
                protoDescriptorStore
                    .get(key)
                    .map(
                        data ->
                            Exceptions.uncheck(
                                () -> DescriptorProtos.FileDescriptorSet.parseFrom(data),
                                DescriptorProtos.FileDescriptorSet.class)))
        .filter(Optional::isPresent)
        .map(Optional::get)
        .flatMap(fileDescriptorSet -> fileDescriptorSet.getFileList().stream())
        .forEach(
            fileDescriptorProto ->
                Exceptions.uncheck(
                    () ->
                        fileDescriptors.add(
                            Descriptors.FileDescriptor.buildFrom(
                                fileDescriptorProto,
                                fileDescriptors.toArray(Descriptors.FileDescriptor[]::new),
                                true))));
    grpcFilter.loadFileDescriptors(fileDescriptors);
  }

  @Override
  public String getName() {
    return "grpc";
  }

  @Override
  public HttpServer buildHttpServer(
      Options options,
      AdminRequestHandler adminRequestHandler,
      StubRequestHandler stubRequestHandler) {
    return new Jetty11HttpServer(options, adminRequestHandler, stubRequestHandler) {
      @Override
      protected void decorateMockServiceContextBeforeConfig(
          ServletContextHandler mockServiceContext) {

        grpcFilter = new GrpcFilter(stubRequestHandler);
        loadFileDescriptors();
        final FilterHolder filterHolder = new FilterHolder(grpcFilter);
        mockServiceContext.addFilter(filterHolder, "/*", EnumSet.of(DispatcherType.REQUEST));
      }
    };
  }
}




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