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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.jclouds.http.okhttp.config;

import java.util.concurrent.TimeUnit;

import javax.inject.Named;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.X509TrustManager;

import okhttp3.OkHttpClient;

import org.jclouds.http.HttpCommandExecutorService;
import org.jclouds.http.HttpUtils;
import org.jclouds.http.config.ConfiguresHttpCommandExecutorService;
import org.jclouds.http.config.SSLModule;
import org.jclouds.http.okhttp.OkHttpClientSupplier;
import org.jclouds.http.okhttp.OkHttpCommandExecutorService;

import shaded.com.google.common.base.Supplier;
import shaded.com.google.inject.AbstractModule;
import shaded.com.google.inject.Inject;
import shaded.com.google.inject.Provider;
import shaded.com.google.inject.Scopes;


/**
 * Configures the {@link OkHttpCommandExecutorService}.
 *
 * Note that this uses threads.
 */
@ConfiguresHttpCommandExecutorService
public class OkHttpCommandExecutorServiceModule extends AbstractModule {

   @Override
   protected void configure() {
      install(new SSLModule());
      bind(HttpCommandExecutorService.class).to(OkHttpCommandExecutorService.class).in(Scopes.SINGLETON);
      bind(OkHttpClient.class).toProvider(OkHttpClientProvider.class).in(Scopes.SINGLETON);
   }

   private static final class OkHttpClientProvider implements Provider {
      private final HostnameVerifier verifier;
      private final Supplier untrustedSSLContextProvider;
      private final X509TrustManager trustAllCertsManager;
      private final HttpUtils utils;
      private final OkHttpClientSupplier clientSupplier;

      @Inject
      OkHttpClientProvider(HttpUtils utils, @Named("untrusted") HostnameVerifier verifier,
            @Named("untrusted") Supplier untrustedSSLContextProvider,
            @Named("untrusted") X509TrustManager trustAllCertsManager,
            OkHttpClientSupplier clientSupplier) {
         this.utils = utils;
         this.verifier = verifier;
         this.untrustedSSLContextProvider = untrustedSSLContextProvider;
         this.trustAllCertsManager = trustAllCertsManager;
         this.clientSupplier = clientSupplier;
      }

      @Override
      public OkHttpClient get() {
         OkHttpClient.Builder clientBuilder = clientSupplier.get().newBuilder()
            .connectTimeout(utils.getConnectionTimeout(), TimeUnit.MILLISECONDS)
            .readTimeout(utils.getSocketOpenTimeout(), TimeUnit.MILLISECONDS)
            // do not follow redirects since https redirects don't work properly
            // ex. Caused by: java.io.IOException: HTTPS hostname wrong: should be
            // 
            .followRedirects(false);

         if (utils.relaxHostname()) {
            clientBuilder.hostnameVerifier(verifier);
         }
         if (utils.trustAllCerts()) {
            clientBuilder.sslSocketFactory(untrustedSSLContextProvider.get().getSocketFactory(), trustAllCertsManager);
         }

         return clientBuilder.build();
      }
   }

}