com.google.appengine.repackaged.com.google.api.client.googleapis.GoogleUtils Maven / Gradle / Ivy

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API for Google App Engine standard environment with some of the dependencies shaded (repackaged)
There is a newer version: 2.0.27
/*
 * Copyright 2013 Google Inc.
 *
 * 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;

import com.google.api.client.util.SecurityUtils;
import com.google.common.annotations.VisibleForTesting;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Utility class for the Google API Client Library.
 *
 * @since 1.12
 * @author [email protected] (Ravi Mistry)
 */
public final class GoogleUtils {

  /** Current release version. */
  public static final String VERSION = getVersion();

  // NOTE: Integer instead of int so compiler thinks it isn't a constant, so it won't inline it
  /**
   * Major part of the current release version.
   *
   * @since 1.14
   */
  public static final Integer MAJOR_VERSION;

  /**
   * Minor part of the current release version.
   *
   * @since 1.14
   */
  public static final Integer MINOR_VERSION;

  /**
   * Bug fix part of the current release version.
   *
   * @since 1.14
   */
  public static final Integer BUGFIX_VERSION;

  @VisibleForTesting
  static final Pattern VERSION_PATTERN = Pattern.compile("(\\d+)\\.(\\d+)\\.(\\d+)(-SNAPSHOT)?");

  static {
    Matcher versionMatcher = VERSION_PATTERN.matcher(VERSION);
    versionMatcher.find();
    MAJOR_VERSION = Integer.parseInt(versionMatcher.group(1));
    MINOR_VERSION = Integer.parseInt(versionMatcher.group(2));
    BUGFIX_VERSION = Integer.parseInt(versionMatcher.group(3));
  }

  /** Cached value for {@link #getCertificateTrustStore()}. */
  static KeyStore certTrustStore;

  /**
   * Returns the key store for trusted root certificates to use for Google APIs.
   *
   * Value is cached, so subsequent access is fast.
   *
   * @since 1.14
   */
  public static synchronized KeyStore getCertificateTrustStore()
      throws IOException, GeneralSecurityException {
    if (certTrustStore == null) {
      certTrustStore = SecurityUtils.getPkcs12KeyStore();
      InputStream keyStoreStream = GoogleUtils.class.getResourceAsStream("google.p12");
      SecurityUtils.loadKeyStore(certTrustStore, keyStoreStream, "notasecret");
    }
    return certTrustStore;
  }

  private static String getVersion() {
    // attempt to read the library's version from a properties file generated during the build
    // this value should be read and cached for later use
    String version = null;
    try (InputStream inputStream =
        GoogleUtils.class.getResourceAsStream("google-api-client.properties")) {
      if (inputStream != null) {
        Properties properties = new Properties();
        properties.load(inputStream);
        version = properties.getProperty("google-api-client.version");
      }
    } catch (IOException e) {
      // ignore
    }
    return version == null ? "unknown-version" : version;
  }

  private GoogleUtils() {}
}