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• VersionInfo.java

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com.yubico.webauthn.meta.VersionInfo Maven / Gradle / Ivy

// Copyright (c) 2018, Yubico AB
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package com.yubico.webauthn.meta;

import com.yubico.internal.util.ExceptionUtil;
import java.io.IOException;
import java.net.URL;
import java.time.LocalDate;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.jar.Manifest;
import lombok.Value;
import lombok.extern.slf4j.Slf4j;

/**
 * Contains version information for the com.yubico.webauthn package.
 *
 * @see Specification
 */
@Slf4j
@Value
public class VersionInfo {

  private static VersionInfo instance;

  public static VersionInfo getInstance() {
    if (instance == null) {
      try {
        instance = new VersionInfo();
      } catch (IOException e) {
        throw ExceptionUtil.wrapAndLog(log, "Failed to create VersionInfo", e);
      }
    }

    return instance;
  }

  /** Represents the specification this implementation is based on */
  private final Specification specification =
      Specification.builder()
          .url(new URL(findValueInManifest("Specification-Url")))
          .latestVersionUrl(new URL(findValueInManifest("Specification-Url-Latest")))
          .status(DocumentStatus.fromString(findValueInManifest("Specification-W3c-Status")).get())
          .releaseDate(LocalDate.parse(findValueInManifest("Specification-Release-Date")))
          .build();

  /** Description of this version of this library */
  private final Implementation implementation =
      new Implementation(
          findValueInManifest("Implementation-Version"),
          new URL(findValueInManifest("Implementation-Source-Url")),
          findValueInManifest("Git-Commit"));

  private VersionInfo() throws IOException {}

  private String findValueInManifest(String key) throws IOException {
    final Enumeration resources =
        getClass().getClassLoader().getResources("META-INF/MANIFEST.MF");

    while (resources.hasMoreElements()) {
      final URL resource = resources.nextElement();
      final Manifest manifest = new Manifest(resource.openStream());
      if ("java-webauthn-server"
          .equals(manifest.getMainAttributes().getValue("Implementation-Id"))) {
        return manifest.getMainAttributes().getValue(key);
      }
    }
    throw new NoSuchElementException("Could not find \"" + key + "\" in manifest.");
  }
}