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/*
 * Copyright (C) 2016 Square, 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 okhttp3.internal.tls;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.PublicKey;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.net.ssl.X509TrustManager;
import javax.security.auth.x500.X500Principal;

public abstract class TrustRootIndex {
  /** Returns the trusted CA certificate that signed {@code cert}. */
  abstract X509Certificate findByIssuerAndSignature(X509Certificate cert);

  public static TrustRootIndex get(X509TrustManager trustManager) {
    try {
      // From org.conscrypt.TrustManagerImpl, we want the method with this signature:
      // private TrustAnchor findTrustAnchorByIssuerAndSignature(X509Certificate lastCert);
      Method method = trustManager.getClass().getDeclaredMethod(
          "findTrustAnchorByIssuerAndSignature", X509Certificate.class);
      method.setAccessible(true);
      return new AndroidTrustRootIndex(trustManager, method);
    } catch (NoSuchMethodException e) {
      return get(trustManager.getAcceptedIssuers());
    }
  }

  public static TrustRootIndex get(X509Certificate... caCerts) {
    return new BasicTrustRootIndex(caCerts);
  }

  /**
   * An index of trusted root certificates that exploits knowledge of Android implementation
   * details. This class is potentially much faster to initialize than {@link BasicTrustRootIndex}
   * because it doesn't need to load and index trusted CA certificates.
   *
   * This class uses APIs added to Android in API 14 (Android 4.0, released October 2011). This
   * class shouldn't be used in Android API 17 or better because those releases are better served by
   * {@link CertificateChainCleaner.AndroidCertificateChainCleaner}.
   */
  static final class AndroidTrustRootIndex extends TrustRootIndex {
    private final X509TrustManager trustManager;
    private final Method findByIssuerAndSignatureMethod;

    AndroidTrustRootIndex(X509TrustManager trustManager, Method findByIssuerAndSignatureMethod) {
      this.findByIssuerAndSignatureMethod = findByIssuerAndSignatureMethod;
      this.trustManager = trustManager;
    }

    @Override public X509Certificate findByIssuerAndSignature(X509Certificate cert) {
      try {
        TrustAnchor trustAnchor = (TrustAnchor) findByIssuerAndSignatureMethod.invoke(
            trustManager, cert);
        return trustAnchor != null
            ? trustAnchor.getTrustedCert()
            : null;
      } catch (IllegalAccessException e) {
        throw new AssertionError();
      } catch (InvocationTargetException e) {
        return null;
      }
    }
  }

  /** A simple index that of trusted root certificates that have been loaded into memory. */
  static final class BasicTrustRootIndex extends TrustRootIndex {
    private final Map> subjectToCaCerts;

    public BasicTrustRootIndex(X509Certificate... caCerts) {
      subjectToCaCerts = new LinkedHashMap<>();
      for (X509Certificate caCert : caCerts) {
        X500Principal subject = caCert.getSubjectX500Principal();
        List subjectCaCerts = subjectToCaCerts.get(subject);
        if (subjectCaCerts == null) {
          subjectCaCerts = new ArrayList<>(1);
          subjectToCaCerts.put(subject, subjectCaCerts);
        }
        subjectCaCerts.add(caCert);
      }
    }

    @Override public X509Certificate findByIssuerAndSignature(X509Certificate cert) {
      X500Principal issuer = cert.getIssuerX500Principal();
      List subjectCaCerts = subjectToCaCerts.get(issuer);
      if (subjectCaCerts == null) return null;

      for (X509Certificate caCert : subjectCaCerts) {
        PublicKey publicKey = caCert.getPublicKey();
        try {
          cert.verify(publicKey);
          return caCert;
        } catch (Exception ignored) {
        }
      }

      return null;
    }
  }
}