feat: add GoogleApacheHttpTransport that uses the v2 ApacheHttpTransport implementation (#1568)

* feat: add GoogleApacheHttpTransport that uses the v2 ApacheHttpTransport implementation

* address review feedback

* address review comments

* address review feedback

Author: chingor13

google-api-client/pom.xml

@@ -150,5 +150,9 @@
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.http-client</groupId>
+      <artifactId>google-http-client-apache-v2</artifactId>
+    </dependency>
   </dependencies>
 </project>

google-api-client/src/main/java/com/google/api/client/googleapis/apache/GoogleApacheHttpTransport.java

@@ -36,12 +36,15 @@
  *
  * @since 1.14
  * @author Yaniv Inbar
+ * @deprecated Use com.google.api.client.googleapis.apache.v2.GoogleApacheHttpTransport
  */
+@Deprecated
 public final class GoogleApacheHttpTransport {
 
   /**
    * Returns a new instance of {@link ApacheHttpTransport} that uses
    * {@link GoogleUtils#getCertificateTrustStore()} for the trusted certificates.
+   * @deprecated Use com.google.api.client.googleapis.apache.v2.GoogleApacheHttpTransport.newTrustedTransport()
    */
   public static ApacheHttpTransport newTrustedTransport() throws GeneralSecurityException,
       IOException {

google-api-client/src/main/java/com/google/api/client/googleapis/apache/package-info.java

@@ -13,7 +13,7 @@
  */
 
 /**
- * Google API's support based on the Apache HTTP Client.
+ * Google APIs support based on the Apache HTTP Client.
  *
  * @since 1.14
  * @author Yaniv Inbar

google-api-client/src/main/java/com/google/api/client/googleapis/apache/v2/GoogleApacheHttpTransport.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * 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 com.google.api.client.googleapis.apache.v2;
+
+import com.google.api.client.googleapis.GoogleUtils;
+import com.google.api.client.http.apache.v2.ApacheHttpTransport;
+import com.google.api.client.util.SslUtils;
+import java.io.IOException;
+import java.net.ProxySelector;
+import java.security.GeneralSecurityException;
+import java.security.KeyStore;
+import java.util.concurrent.TimeUnit;
+import javax.net.ssl.SSLContext;
+import org.apache.http.client.HttpClient;
+import org.apache.http.config.SocketConfig;
+import org.apache.http.conn.socket.LayeredConnectionSocketFactory;
+import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
+import org.apache.http.impl.conn.SystemDefaultRoutePlanner;
+
+/**
+ * Utilities for Google APIs based on {@link ApacheHttpTransport}.
+ *
+ * @since 1.31
+ */
+public final class GoogleApacheHttpTransport {
+
+  /**
+   * Returns a new instance of {@link ApacheHttpTransport} that uses
+   * {@link GoogleUtils#getCertificateTrustStore()} for the trusted certificates.
+   */
+  public static ApacheHttpTransport newTrustedTransport() throws GeneralSecurityException,
+      IOException {
+    PoolingHttpClientConnectionManager connectionManager =
+        new PoolingHttpClientConnectionManager(-1, TimeUnit.MILLISECONDS);
+
+    // Disable the stale connection check (previously configured in the HttpConnectionParams
+    connectionManager.setValidateAfterInactivity(-1);
+
+    // Use the included trust store
+    KeyStore trustStore = GoogleUtils.getCertificateTrustStore();
+    SSLContext sslContext = SslUtils.getTlsSslContext();
+    SslUtils.initSslContext(sslContext, trustStore, SslUtils.getPkixTrustManagerFactory());
+    LayeredConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext);
+
+    HttpClient client = HttpClientBuilder.create()
+        .useSystemProperties()
+        .setSSLSocketFactory(socketFactory)
+        .setMaxConnTotal(200)
+        .setMaxConnPerRoute(20)
+        .setRoutePlanner(new SystemDefaultRoutePlanner(ProxySelector.getDefault()))
+        .setConnectionManager(connectionManager)
+        .disableRedirectHandling()
+        .disableAutomaticRetries()
+        .build();
+    return new ApacheHttpTransport(client);
+  }
+
+  private GoogleApacheHttpTransport() {
+  }
+}

google-api-client/src/main/java/com/google/api/client/googleapis/apache/v2/package-info.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * 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.
+ */
+
+/**
+ * Google APIs support based on the Apache HTTP Client.
+ *
+ * @since 1.31
+ */
+
+package com.google.api.client.googleapis.apache.v2;
+