feat: Provide HttpTransport support for google certificates with apache HTTP client v5 (#2497)

docs/component-modules.md

@@ -55,4 +55,10 @@ XML extensions to the Google API Client Library for Java
 (`google-api-client-xml`). This module depends on `google-api-client` and
 `google-http-client-xml`.
 
+## google-api-client-apache-v5
+
+Provides Apache extension to the Google HTTP Client Library for Java (`google-api-client-apache-v5`) that
+returns an implementation of `HttpTransport` based on the Apache HTTP Client (v5) with Google certificates loaded in truststore. This module depends
+on `google-http-client`.
+
 [protobuf]: https://developers.google.com/protocol-buffers/docs/overview

google-api-client-apache-v5/pom.xml

@@ -0,0 +1,197 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.google.api-client</groupId>
+        <artifactId>google-api-client-parent</artifactId>
+        <version>2.6.1-SNAPSHOT</version>
+    </parent>
+    <artifactId>google-api-client-apache-v5</artifactId>
+    <name>Apache extensions to the Google APIs Client Library for Java</name>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-resources-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>resources</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>com.coveo</groupId>
+                <artifactId>fmt-maven-plugin</artifactId>
+                <version>2.13</version>
+                <configuration>
+                    <style>google</style>
+                    <verbose>true</verbose>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.google.googlejavaformat</groupId>
+                        <artifactId>google-java-format</artifactId>
+                        <version>1.13.0</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+            <plugin>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <configuration>
+                    <links>
+                        <link>https://docs.oracle.com/javase/7/docs/api/</link>
+                        <link>https://cloud.google.com/appengine/docs/standard/java/javadoc/</link>
+                        <link>https://googleapis.dev/java/google-http-client/${project.http.version}/</link>
+                        <link>https://googleapis.dev/java/google-oauth-client/${project.oauth.version}/</link>
+                    </links>
+                    <doctitle>${project.name} ${project.version}</doctitle>
+                    <windowtitle>${project.artifactId} ${project.version}</windowtitle>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                        <manifest>
+                            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+                        </manifest>
+                        <manifestEntries>
+                            <Automatic-Module-Name>google.api.client</Automatic-Module-Name>
+                        </manifestEntries>
+                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                    </archive>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <version>5.1.9</version>
+                <executions>
+                    <execution>
+                        <id>bundle-manifest</id>
+                        <phase>process-classes</phase>
+                        <goals>
+                            <goal>manifest</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <instructions>
+                        <Bundle-DocURL>https://developers.google.com/api-client-library/java/</Bundle-DocURL>
+                        <Bundle-Description>Google HTTP transport wrapper for the Apache 5 Http Client.
+                        </Bundle-Description>
+                        <Bundle-SymbolicName>com.google.api.client.googleapis.apache</Bundle-SymbolicName>
+                    </instructions>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-source-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>source-jar</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>validate-google-style</id>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <configLocation>google_checks.xml</configLocation>
+                            <suppressionsLocation>src/checkstyle/checkstyle-suppressions.xml</suppressionsLocation>
+                            <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                            <failOnViolation>true</failOnViolation>
+                            <violationSeverity>warning</violationSeverity>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+            </resource>
+            <resource>
+                <directory>src/main/properties</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.api-client</groupId>
+            <artifactId>google-api-client</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.apache.httpcomponents</groupId>
+                    <artifactId>httpcore</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.apache.httpcomponents</groupId>
+                    <artifactId>httpclient</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>com.google.http-client</groupId>
+            <artifactId>google-http-client-apache-v5</artifactId>
+            <version>1.45.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${project.guava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents.client5</groupId>
+            <artifactId>httpclient5</artifactId>
+            <version>5.3.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents.core5</groupId>
+            <artifactId>httpcore5</artifactId>
+            <version>5.2.4</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.http-client</groupId>
+            <artifactId>google-http-client</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.apache.httpcomponents</groupId>
+                    <artifactId>httpcore</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.apache.httpcomponents</groupId>
+                    <artifactId>httpclient</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>com.google.api-client</groupId>
+            <artifactId>google-api-client</artifactId>
+            <type>test-jar</type>
+            <scope>test</scope>
+            <version>2.6.1-SNAPSHOT</version>
+        </dependency>
+    </dependencies>
+</project>

google-api-client-apache-v5/src/checkstyle/checkstyle-suppressions.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<!DOCTYPE suppressions PUBLIC
+        "-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
+        "https://checkstyle.org/dtds/suppressions_1_2.dtd">
+<suppressions>
+    <!-- Test checkstyle suppressions -->
+    <suppress checks="MissingJavadocType" files=".*Test.java"/>
+    <suppress checks="AbbreviationAsWordInName" files=".*Test.java"/>
+    <suppress checks="VariableDeclarationUsageDistance" files=".*Test.java"/>
+</suppressions>

google-api-client-apache-v5/src/main/java/com/google/api/client/googleapis/apache/v5/GoogleApache5HttpTransport.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright 2024 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.v5;
+
+import com.google.api.client.googleapis.GoogleUtils;
+import com.google.api.client.googleapis.mtls.MtlsProvider;
+import com.google.api.client.googleapis.mtls.MtlsUtils;
+import com.google.api.client.googleapis.util.Utils;
+import com.google.api.client.http.apache.v5.Apache5HttpTransport;
+import com.google.api.client.util.SslUtils;
+import com.google.common.annotations.Beta;
+import com.google.common.annotations.VisibleForTesting;
+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.hc.client5.http.config.ConnectionConfig;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
+import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
+import org.apache.hc.client5.http.impl.routing.SystemDefaultRoutePlanner;
+import org.apache.hc.client5.http.socket.ConnectionSocketFactory;
+import org.apache.hc.client5.http.socket.LayeredConnectionSocketFactory;
+import org.apache.hc.client5.http.socket.PlainConnectionSocketFactory;
+import org.apache.hc.client5.http.ssl.SSLConnectionSocketFactory;
+import org.apache.hc.core5.http.config.Registry;
+import org.apache.hc.core5.http.config.RegistryBuilder;
+
+/**
+ * Utilities for Google APIs based on {@link Apache5HttpTransport}.
+ *
+ * @since 2.6.1
+ */
+public final class GoogleApache5HttpTransport {
+
+  /**
+   * Returns a new instance of {@link Apache5HttpTransport} that uses {@link
+   * GoogleUtils#getCertificateTrustStore()} for the trusted certificates. If
+   * `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is set to "true", and the default
+   * client certificate key store from {@link Utils#loadDefaultMtlsKeyStore()} is not null, then the
+   * transport uses the default client certificate and is mutual TLS.
+   */
+  public static Apache5HttpTransport newTrustedTransport()
+      throws GeneralSecurityException, IOException {
+    return newTrustedTransport(MtlsUtils.getDefaultMtlsProvider());
+  }
+
+  /**
+   * {@link Beta} <br>
+   * Returns a new instance of {@link Apache5HttpTransport} that uses {@link
+   * GoogleUtils#getCertificateTrustStore()} for the trusted certificates. mtlsProvider can be used
+   * to configure mutual TLS for the transport.
+   *
+   * @param mtlsProvider MtlsProvider to configure mutual TLS for the transport
+   */
+  @Beta
+  public static Apache5HttpTransport newTrustedTransport(MtlsProvider mtlsProvider)
+      throws GeneralSecurityException, IOException {
+
+    SocketFactoryRegistryHandler handler = new SocketFactoryRegistryHandler(mtlsProvider);
+
+    PoolingHttpClientConnectionManager connectionManager =
+        new PoolingHttpClientConnectionManager(handler.getSocketFactoryRegistry());
+    connectionManager.setMaxTotal(200);
+    connectionManager.setDefaultMaxPerRoute(20);
+    connectionManager.setDefaultConnectionConfig(
+        ConnectionConfig.custom()
+            .setTimeToLive(-1, TimeUnit.MILLISECONDS)
+            .setValidateAfterInactivity(-1L, TimeUnit.MILLISECONDS)
+            .build());
+
+    CloseableHttpClient client =
+        HttpClients.custom()
+            .useSystemProperties()
+            .setConnectionManager(connectionManager)
+            .setRoutePlanner(new SystemDefaultRoutePlanner(ProxySelector.getDefault()))
+            .disableRedirectHandling()
+            .disableAutomaticRetries()
+            .build();
+
+    return new Apache5HttpTransport(client, handler.isMtls());
+  }
+
+  @VisibleForTesting
+  static class SocketFactoryRegistryHandler {
+    private final Registry<ConnectionSocketFactory> socketFactoryRegistry;
+    private final boolean isMtls;
+
+    public SocketFactoryRegistryHandler(MtlsProvider mtlsProvider)
+        throws GeneralSecurityException, IOException {
+      KeyStore mtlsKeyStore = null;
+      String mtlsKeyStorePassword = null;
+      if (mtlsProvider.useMtlsClientCertificate()) {
+        mtlsKeyStore = mtlsProvider.getKeyStore();
+        mtlsKeyStorePassword = mtlsProvider.getKeyStorePassword();
+      }
+
+      // Use the included trust store
+      KeyStore trustStore = GoogleUtils.getCertificateTrustStore();
+      SSLContext sslContext = SslUtils.getTlsSslContext();
+
+      if (mtlsKeyStore != null && mtlsKeyStorePassword != null) {
+        this.isMtls = true;
+        SslUtils.initSslContext(
+            sslContext,
+            trustStore,
+            SslUtils.getPkixTrustManagerFactory(),
+            mtlsKeyStore,
+            mtlsKeyStorePassword,
+            SslUtils.getDefaultKeyManagerFactory());
+      } else {
+        this.isMtls = false;
+        SslUtils.initSslContext(sslContext, trustStore, SslUtils.getPkixTrustManagerFactory());
+      }
+      LayeredConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext);
+
+      this.socketFactoryRegistry =
+          RegistryBuilder.<ConnectionSocketFactory>create()
+              .register("http", PlainConnectionSocketFactory.getSocketFactory())
+              .register("https", socketFactory)
+              .build();
+    }
+
+    public Registry<ConnectionSocketFactory> getSocketFactoryRegistry() {
+      return this.socketFactoryRegistry;
+    }
+
+    public boolean isMtls() {
+      return this.isMtls;
+    }
+  }
+
+  private GoogleApache5HttpTransport() {}
+}

google-api-client-apache-v5/src/main/java/com/google/api/client/googleapis/apache/v5/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2024 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 v5.
+ *
+ * @since 2.6.1
+ */
+package com.google.api.client.googleapis.apache.v5;