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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package derphttp
import (
"log"
"net/http"
"tailscale.com/derp"
)
func Handler(s *derp.Server) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if p := r.Header.Get("Upgrade"); p != "WebSocket" && p != "DERP" {
http.Error(w, "DERP requires connection upgrade", http.StatusUpgradeRequired)
return
}
w.Header().Set("Upgrade", "DERP")
w.Header().Set("Connection", "Upgrade")
w.WriteHeader(http.StatusSwitchingProtocols)
h, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "HTTP does not support general TCP support", 500)
return
}
netConn, conn, err := h.Hijack()
if err != nil {
log.Printf("Hijack failed: %v", err)
http.Error(w, "HTTP does not support general TCP support", 500)
return
}
s.Accept(netConn, conn, netConn.RemoteAddr().String())
})
}
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