import android.util.Log;
import java.io.IOException;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

/**
 * 自動(dòng)刷新token的攔截器
 * 
 * @author shijiacheng 
 * @version 1.0
 */

public class TokenInterceptor implements Interceptor {

  private static final String TAG = "TokenInterceptor";

  @Override
  public Response intercept(Chain chain) throws IOException {
    Request request = chain.request();
    Response response = chain.proceed(request);
    Log.d(TAG, "response.code=" + response.code());

    //根據(jù)和服務(wù)端的約定判斷token過(guò)期
    if (isTokenExpired(response)) {
      Log.d(TAG, "自動(dòng)刷新Token,然后重新請(qǐng)求數(shù)據(jù)");
      //同步請(qǐng)求方式，獲取最新的Token
      String newToken = getNewToken();
      //使用新的Token，創(chuàng)建新的請(qǐng)求
      Request newRequest = chain.request()
          .newBuilder()
          .header("Authorization", "Basic " + newToken)
          .build();
      //重新請(qǐng)求
      return chain.proceed(newRequest);
    }
    return response;
  }

  /**
   * 根據(jù)Response，判斷Token是否失效
   *
   * @param response
   * @return
   */
  private boolean isTokenExpired(Response response) {
    if (response.code() == 301) {
      return true;
    }
    return false;
  }

  /**
   * 同步請(qǐng)求方式，獲取最新的Token
   *
   * @return
   */
  private String getNewToken() throws IOException {
    // 通過(guò)獲取token的接口，同步請(qǐng)求接口
    String newToken = "";
    return newToken;
  }
}

/**
 * 初始化OkHttpUtils
 */
public OkHttpUtils(){
  /**
   * 配置OkHttpClient
   */
  OkHttpClient client = new OkHttpClient.Builder()
      .connectTimeout(15, TimeUnit.SECONDS)
      .readTimeout(3000, TimeUnit.SECONDS)
      .writeTimeout(3000, TimeUnit.SECONDS)
//       .cache(new Cache())
//       .addInterceptor(interceptor)//這里可以繼續(xù)添加多種攔截器
      .addInterceptor(new TokenInterceptor())//添加獲取token的攔截器
      .build();
  
}