forked from a/lifeto-shop
114 lines
2.1 KiB
Go
114 lines
2.1 KiB
Go
package main
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import (
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"io"
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"log"
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"net"
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"net/http"
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"net/url"
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"path"
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"strings"
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"gfx.cafe/open/gun"
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)
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var Config struct {
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Port string
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Root string
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Remote string
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}
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func init() {
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gun.Load(&Config)
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if Config.Port == "" {
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Config.Port = "8080"
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}
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if Config.Root == "" {
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Config.Root = "dist"
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}
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if Config.Remote == "" {
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Config.Remote = "https://beta.lifeto.co"
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}
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Config.Root = path.Clean(Config.Root)
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}
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var hopHeaders = []string{
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"Connection",
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"Keep-Alive",
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"Proxy-Authenticate",
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"Proxy-Authorization",
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"Te",
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"Trailers",
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"Transfer-Encoding",
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"Upgrade",
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}
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func appendHostToXForwardHeader(header http.Header, host string) {
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if prior, ok := header["X-Forwarded-For"]; ok {
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host = strings.Join(prior, ", ") + ", " + host
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}
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header.Set("X-Forwarded-For", host)
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}
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func copyHeader(dst, src http.Header) {
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for k, vv := range src {
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for _, v := range vv {
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dst.Add(k, v)
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}
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}
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}
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func delHopHeaders(header http.Header) {
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for _, h := range hopHeaders {
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header.Del(h)
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}
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}
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type Handler struct {
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p ProxyHandler
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}
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if strings.HasPrefix(r.URL.Path, "/lifeto") {
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http.StripPrefix("/lifeto", &h.p).ServeHTTP(w, r)
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return
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}
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h.handleSite(w, r)
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}
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type ProxyHandler struct {
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c http.Client
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}
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func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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r.RequestURI = ""
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if clientIP, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
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appendHostToXForwardHeader(r.Header, clientIP)
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}
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r.URL, _ = url.Parse(Config.Remote + r.URL.Path)
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r.Host = r.URL.Host
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resp, err := h.c.Do(r)
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if err != nil {
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http.Error(w, "Server Error", http.StatusInternalServerError)
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log.Println("ServeHTTP:", err)
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return
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}
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defer resp.Body.Close()
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delHopHeaders(resp.Header)
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copyHeader(w.Header(), resp.Header)
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w.WriteHeader(resp.StatusCode)
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io.Copy(w, resp.Body)
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}
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func (h *Handler) handleSite(w http.ResponseWriter, r *http.Request) {
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http.FileServer(http.Dir(Config.Root)).ServeHTTP(w, r)
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}
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func main() {
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log.Printf("starting with config: %+v", Config)
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http.ListenAndServe(":"+Config.Port, &Handler{})
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}
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