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package com.doumee.lib_coremodel.http.interceptor;
 
import android.content.Context;
 
import com.doumee.lib_coremodel.http.utils.NetworkUtil;
 
import java.io.IOException;
 
import okhttp3.CacheControl;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;
 
/**
 * Created by goldze on 2017/5/10.
 * 无网络状态下智能读取缓存的拦截器
 */
public class CacheInterceptor implements Interceptor {
 
    private Context context;
 
    public CacheInterceptor(Context context) {
        this.context = context;
    }
 
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        if (NetworkUtil.isNetworkAvailable(context)) {
            Response response = chain.proceed(request);
            // read from cache for 60 s
            int maxAge = 60;
            return response.newBuilder()
                    .removeHeader("Pragma")
                    .removeHeader("Cache-Control")
                    .header("Cache-Control", "public, max-age=" + maxAge)
                    .build();
        } else {
            //读取缓存信息
            request = request.newBuilder()
                    .cacheControl(CacheControl.FORCE_CACHE)
                    .build();
            Response response = chain.proceed(request);
            //set cache times is 3 days
            int maxStale = 60 * 60 * 24 * 3;
            return response.newBuilder()
                    .removeHeader("Pragma")
                    .removeHeader("Cache-Control")
                    .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                    .build();
        }
    }
}