func main(){
router := gin.Default()//创建一个router
router.Use(MiddleWare())//中间件，起拦截器的作用
router.Any("/*action", Forward)//所有请求都会经过Forward函数转发
router.Run(":8000")
}
func Forward(c *gin.Context) {
targetHost := &httputils.TargetHost{
Host: "www.baidu.com",
IsHttps: false,
}
HostReverseProxy(c.Writer, c.Request, targetHost)
}
func HostReverseProxy(w http.ResponseWriter, req *http.Request, targetHost *TargetHost) {
host := ""
if targetHost.IsHttps {
host = host + "https://"
} else {
host = host + "http://"
}
remote, err := url.Parse(host + targetHost.Host)
if err != nil {
log.Errorf("err:%s", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
proxy := httputil.NewSingleHostReverseProxy(remote)
if targetHost.IsHttps {
tls, err := GetVerTLSConfig(targetHost.CAPath)
if err != nil {
log.Errorf("https crt error: %s", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
var pTransport http.RoundTripper = &http.Transport{
Dial: func(netw, addr string) (net.Conn, error) {
c, err := net.DialTimeout(netw, addr, time.Second*time.Duration(DialTimeout))
if err != nil {
return nil, err
}
return c, nil
},
ResponseHeaderTimeout: time.Second * time.Duration(ResponseHeaderTimeout),
TLSClientConfig: tls,
}
proxy.Transport = pTransport
}
proxy.ServeHTTP(w, req)
}
type TargetHost struct {
Host string
IsHttps bool
CAPath string
}
func MiddleWare() gin.HandlerFunc {
return func(c *gin.Context) {
account := c.Request.Header.Get("ename")//从请求头中获取ename字段
if account == "" {
c.JSON(http.StatusOK, httputils.Response{
Code: 400002,
Message: "用户未登录",
})
c.Abort()
return
}
fmt.Println("before middleware")
c.Set("request", "clinet_request")
c.Next()
fmt.Println("before middleware")
}
}
