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