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package acme
import (
"fmt"
"net"
"net/http"
"strings"
)
// HTTPProviderServer implements ChallengeProvider for `http-01` challenge
// It may be instantiated without using the NewHTTPProviderServer function if
// you want only to use the default values.
type HTTPProviderServer struct {
iface string
port string
done chan bool
listener net.Listener
}
// NewHTTPProviderServer creates a new HTTPProviderServer on the selected interface and port.
// Setting iface and / or port to an empty string will make the server fall back to
// the "any" interface and port 80 respectively.
func NewHTTPProviderServer(iface, port string) *HTTPProviderServer {
return &HTTPProviderServer{iface: iface, port: port}
}
// Present starts a web server and makes the token available at `HTTP01ChallengePath(token)` for web requests.
func (s *HTTPProviderServer) Present(domain, token, keyAuth string) error {
if s.port == "" {
s.port = "80"
}
var err error
s.listener, err = net.Listen("tcp", net.JoinHostPort(s.iface, s.port))
if err != nil {
return fmt.Errorf("Could not start HTTP server for challenge -> %v", err)
}
s.done = make(chan bool)
go s.serve(domain, token, keyAuth)
return nil
}
// CleanUp closes the HTTP server and removes the token from `HTTP01ChallengePath(token)`
func (s *HTTPProviderServer) CleanUp(domain, token, keyAuth string) error {
if s.listener == nil {
return nil
}
s.listener.Close()
<-s.done
return nil
}
func (s *HTTPProviderServer) serve(domain, token, keyAuth string) {
path := HTTP01ChallengePath(token)
// The handler validates the HOST header and request type.
// For validation it then writes the token the server returned with the challenge
mux := http.NewServeMux()
mux.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.Host, domain) && r.Method == "GET" {
w.Header().Add("Content-Type", "text/plain")
w.Write([]byte(keyAuth))
logf("[INFO][%s] Served key authentication", domain)
} else {
logf("[INFO] Received request for domain %s with method %s", r.Host, r.Method)
w.Write([]byte("TEST"))
}
})
httpServer := &http.Server{
Handler: mux,
}
// Once httpServer is shut down we don't want any lingering
// connections, so disable KeepAlives.
httpServer.SetKeepAlivesEnabled(false)
httpServer.Serve(s.listener)
s.done <- true
}
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