package com.alpha58.okhttp;

import android.content.Context;

import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.Arrays;
import java.util.Collection;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

import okhttp3.OkHttpClient;

/**
 * Created by admin on 2017/03/12.
 */
public final class HTTPSUtils {
  private OkHttpClient client;

  public Context mContext;


  /**
   * 獲取OkHttpClient實例
   * @return
   */
  public OkHttpClient getInstance()
  {
    return client;
  }

  /**
   * 初始化HTTPS,添加信任證書
   * @param context
   */
  public HTTPSUtils(Context context) {
    mContext = context;
    X509TrustManager trustManager;
    SSLSocketFactory sslSocketFactory;
    final InputStream inputStream;
    try {
      inputStream = mContext.getAssets().open("srca.cer"); // 得到證書的輸入流
      try {

        trustManager = trustManagerForCertificates(inputStream);//以流的方式讀入證書
        SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(null, new TrustManager[]{trustManager}, null);
        sslSocketFactory = sslContext.getSocketFactory();

      } catch (GeneralSecurityException e) {
        throw new RuntimeException(e);
      }

      client = new OkHttpClient.Builder()
          .sslSocketFactory(sslSocketFactory, trustManager)
          .build();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  /**
   * 以流的方式添加信任證書
   */
  /**
   * Returns a trust manager that trusts {@code certificates} and none other. HTTPS services whose
   * certificates have not been signed by these certificates will fail with a {@code
   * SSLHandshakeException}.
   * <p>
   * <p>This can be used to replace the host platform's built-in trusted certificates with a custom
   * set. This is useful in development where certificate authority-trusted certificates aren't
   * available. Or in production, to avoid reliance on third-party certificate authorities.
   * <p>
   * <p>
   * <h3>Warning: Customizing Trusted Certificates is Dangerous!</h3>
   * <p>
   * <p>Relying on your own trusted certificates limits your server team's ability to update their
   * TLS certificates. By installing a specific set of trusted certificates, you take on additional
   * operational complexity and limit your ability to migrate between certificate authorities. Do
   * not use custom trusted certificates in production without the blessing of your server's TLS
   * administrator.
   */
  private X509TrustManager trustManagerForCertificates(InputStream in)
      throws GeneralSecurityException {
    CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
    Collection<? extends Certificate> certificates = certificateFactory.generateCertificates(in);
    if (certificates.isEmpty()) {
      throw new IllegalArgumentException("expected non-empty set of trusted certificates");
    }

    // Put the certificates a key store.
    char[] password = "password".toCharArray(); // Any password will work.
    KeyStore keyStore = newEmptyKeyStore(password);
    int index = 0;
    for (Certificate certificate : certificates) {
      String certificateAlias = Integer.toString(index++);
      keyStore.setCertificateEntry(certificateAlias, certificate);
    }

    // Use it to build an X509 trust manager.
    KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(
        KeyManagerFactory.getDefaultAlgorithm());
    keyManagerFactory.init(keyStore, password);
    TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
        TrustManagerFactory.getDefaultAlgorithm());
    trustManagerFactory.init(keyStore);
    TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
    if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {
      throw new IllegalStateException("Unexpected default trust managers:"
          + Arrays.toString(trustManagers));
    }
    return (X509TrustManager) trustManagers[0];
  }


  /**
   * 添加password
   * @param password
   * @return
   * @throws GeneralSecurityException
   */
  private KeyStore newEmptyKeyStore(char[] password) throws GeneralSecurityException {
    try {
      KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType()); // 這里添加自定義的密碼，默認
      InputStream in = null; // By convention, 'null' creates an empty key store.
      keyStore.load(in, password);
      return keyStore;
    } catch (IOException e) {
      throw new AssertionError(e);
    }
  }


}

public void getHttpsHtml(View view) {
    Request request = new Request.Builder()
        .url("https://kyfw.12306.cn/otn/")
        .build();
    HTTPSUtils httpsUtils = new HTTPSUtils(this);
    httpsUtils.getInstance().newCall(request).enqueue(new Callback() {
      @Override
      public void onFailure(Call call, IOException e) {
        System.out.println("--------------onFailure--------------" + e.toString());
      }

      @Override
      public void onResponse(Call call, Response response) throws IOException {
        System.out.println("--------------onResponse--------------" + response.body().string());
      }
    });
  }