var _ = require('lodash');

var request = require("request");

/*

    @LM 2017-02-16

    node端代理浏览器路由 解决浏览器跨域问题

    demo:

    router.post('/proxy_http',proxy_routes);

    condition = {

        url:'',//接口地址 (必填)

        method:''//接口方式 (看接口需求)

        host:'',//

        form:{} post请求参数

    }

*/

exports.proxy_routes = function(req, res, next) {

    /*处理get或者post请求的req参数*/

    var condition = _.assign(req.body || {}, req.query || {});

    if(!condition.url){

        return next({status:,message:'not defind url'})

    }

    if(condition.host){

        req.headers.host = condition.host;

    }

    var opts = {

        url: condition.url,

        method: condition.method||'GET',

        // headers: req.headers,

        form:condition.form||{}

    };

    var ts = Date.now();

    console.log('proxy_routes', opts, ts, "请求开始--");

    request(opts,function(err, response, body) {

        if(err){

            console.log('proxy_routes', opts, ts, "请求异常--err:" + err, (Date.now() - ts) + 'ms');

            return next(err);

        }

        console.log('proxy_routes', opts, ts, "请求正常--response.statusCode:" + response.statusCode, (Date.now() - ts) + 'ms');

        try{

            res.json(JSON.parse(body));

        }catch(e){

            res.json(body);

        }

    });

};