BaseOkHttp/okhttplib/src/main/java/com/benyanyi/okhttp/config/CacheInterceptor.java

package com.benyanyi.okhttp.config;


import android.content.Context;

import com.benyanyi.okhttp.util.InternetUtil;

import org.jetbrains.annotations.NotNull;

import java.io.IOException;

import okhttp3.CacheControl;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

/**
 * @author YanYi
 * @date 2019-08-12 16:51
 * @email ben@yanyi.red
 * @overview
 */
class CacheInterceptor implements Interceptor {

    private Context context;

    CacheInterceptor(Context context) {
        this.context = context;
    }

    @NotNull
    @Override
    public Response intercept(Chain chain) throws IOException {

        Request request = chain.request();
        if (InternetUtil.isNetWorkConnected(context)) {
            request = request.newBuilder()
                    .cacheControl(CacheControl.FORCE_CACHE)
                    .build();
        }
        Response response = chain.proceed(request);
        if (!InternetUtil.isNetWorkConnected(context)) {
            int maxAge = 0 * 60;
            // 有网络时 设置缓存超时时间0个小时
            response.newBuilder()
                    .header("Cache-Control", "public, max-age=" + maxAge)
                    .removeHeader("Pragma")// 清除头信息，因为服务器如果不支持，会返回一些干扰信息，不清除下面无法生效
                    .build();
        } else {
            // 无网络时，设置超时为4周
            int maxStale = 60 * 60 * 24 * 28;
//            val maxStale = 0
            response.newBuilder()
                    .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                    .removeHeader("Pragma")
                    .build();
        }
        return response;
    }
}