url = require 'url'

module.exports = (opts) ->
    return false unless opts.autoRedirect
    {
        name: 'autoRedirect'
        afterProxy: (proxyRes, requestParam) ->
            statusCode = proxyRes.statusCode
            headers = proxyRes.headers
            if 300 <= statusCode < 400 and headers.location
                location = headers.location
                locObj = url.parse location
                # 绝对地址判断是否是同域
                if locObj.host
                    targetHost = "#{locObj.protocol}//#{locObj.hostname}:#{locObj.port or 80}"
                    sourceHost = "http://#{requestParam.host}:#{requestParam.port}"
                    if targetHost isnt sourceHost
                        return
                    location = locObj.pathname

            headers.location = location
    }