2020-10-24 19:15:32 +00:00
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package gemini
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2020-09-25 23:06:56 +00:00
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import (
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"bufio"
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"crypto/tls"
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2020-09-28 05:10:36 +00:00
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"crypto/x509"
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2020-09-25 23:06:56 +00:00
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"log"
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"net"
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"net/url"
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2020-09-28 07:15:19 +00:00
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"path"
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2020-09-25 23:06:56 +00:00
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"sort"
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"strconv"
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"strings"
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2020-09-28 07:15:19 +00:00
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"sync"
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2020-09-25 23:06:56 +00:00
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"time"
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)
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// Server is a Gemini server.
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type Server struct {
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// Addr specifies the address that the server should listen on.
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// If Addr is empty, the server will listen on the address ":1965".
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Addr string
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2020-10-12 03:48:18 +00:00
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// CertificateStore contains the certificates used by the server.
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CertificateStore CertificateStore
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// GetCertificate, if not nil, will be called to retrieve the certificate
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// to use for a given hostname.
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// If the certificate is nil, the connection will be aborted.
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2020-10-13 18:22:15 +00:00
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GetCertificate func(hostname string, store *CertificateStore) *tls.Certificate
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2020-09-25 23:06:56 +00:00
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2020-10-21 20:28:50 +00:00
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// registered responders
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responders map[responderKey]Responder
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2020-10-11 21:53:22 +00:00
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}
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type responderKey struct {
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scheme string
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hostname string
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wildcard bool
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}
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2020-10-21 20:28:50 +00:00
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// Register registers a responder for the given pattern.
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// Patterns must be in the form of scheme://hostname (e.g. gemini://example.com).
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// If no scheme is specified, a default scheme of gemini:// is assumed.
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// Wildcard patterns are supported (e.g. *.example.com).
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2020-10-21 20:28:50 +00:00
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func (s *Server) Register(pattern string, responder Responder) {
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if pattern == "" {
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panic("gemini: invalid pattern")
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2020-10-11 22:57:04 +00:00
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}
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2020-10-21 20:28:50 +00:00
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if responder == nil {
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2020-10-24 19:15:32 +00:00
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panic("gemini: nil responder")
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2020-10-11 22:57:04 +00:00
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}
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if s.responders == nil {
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s.responders = map[responderKey]Responder{}
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2020-10-12 17:50:07 +00:00
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}
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2020-10-21 17:22:26 +00:00
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split := strings.SplitN(pattern, "://", 2)
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var key responderKey
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if len(split) == 2 {
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key.scheme = split[0]
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key.hostname = split[1]
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} else {
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key.scheme = "gemini"
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key.hostname = split[0]
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}
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split = strings.SplitN(key.hostname, ".", 2)
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2020-10-21 20:04:19 +00:00
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if len(split) == 2 && split[0] == "*" {
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key.hostname = split[1]
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key.wildcard = true
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}
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s.responders[key] = responder
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}
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2020-10-21 20:28:50 +00:00
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// RegisterFunc registers a responder function for the given pattern.
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func (s *Server) RegisterFunc(pattern string, responder func(*ResponseWriter, *Request)) {
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s.Register(pattern, ResponderFunc(responder))
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2020-09-25 23:06:56 +00:00
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}
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// ListenAndServe listens for requests at the server's configured address.
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func (s *Server) ListenAndServe() error {
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addr := s.Addr
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if addr == "" {
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addr = ":1965"
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}
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ln, err := net.Listen("tcp", addr)
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if err != nil {
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return err
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}
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defer ln.Close()
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config := &tls.Config{
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2020-10-13 20:44:46 +00:00
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ClientAuth: tls.RequestClientCert,
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MinVersion: tls.VersionTLS12,
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2020-10-12 03:48:18 +00:00
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GetCertificate: func(h *tls.ClientHelloInfo) (*tls.Certificate, error) {
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if s.GetCertificate != nil {
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return s.GetCertificate(h.ServerName, &s.CertificateStore), nil
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}
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return s.CertificateStore.Lookup(h.ServerName)
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},
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2020-09-25 23:06:56 +00:00
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}
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tlsListener := tls.NewListener(ln, config)
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return s.Serve(tlsListener)
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}
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// Serve listens for requests on the provided listener.
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func (s *Server) Serve(l net.Listener) error {
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var tempDelay time.Duration // how long to sleep on accept failure
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for {
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rw, err := l.Accept()
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if err != nil {
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// If this is a temporary error, sleep
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if ne, ok := err.(net.Error); ok && ne.Temporary() {
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if tempDelay == 0 {
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tempDelay = 5 * time.Millisecond
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} else {
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tempDelay *= 2
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}
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if max := 1 * time.Second; tempDelay > max {
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tempDelay = max
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}
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2020-10-24 19:15:32 +00:00
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log.Printf("gemini: Accept error: %v; retrying in %v", err, tempDelay)
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time.Sleep(tempDelay)
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continue
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}
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// Otherwise, return the error
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return err
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}
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tempDelay = 0
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go s.respond(rw)
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}
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}
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2020-10-21 20:28:50 +00:00
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// respond responds to a connection.
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func (s *Server) respond(conn net.Conn) {
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r := bufio.NewReader(conn)
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w := newResponseWriter(conn)
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// Read requested URL
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rawurl, err := r.ReadString('\r')
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if err != nil {
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return
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}
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// Read terminating line feed
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if b, err := r.ReadByte(); err != nil {
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return
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} else if b != '\n' {
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w.WriteHeader(StatusBadRequest, "Bad request")
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}
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// Trim carriage return
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rawurl = rawurl[:len(rawurl)-1]
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// Ensure URL is valid
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if len(rawurl) > 1024 {
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w.WriteHeader(StatusBadRequest, "Bad request")
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} else if url, err := url.Parse(rawurl); err != nil || url.User != nil {
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// Note that we return an error status if User is specified in the URL
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w.WriteHeader(StatusBadRequest, "Bad request")
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} else {
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// If no scheme is specified, assume a default scheme of gemini://
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if url.Scheme == "" {
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url.Scheme = "gemini"
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}
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req := &Request{
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URL: url,
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RemoteAddr: conn.RemoteAddr(),
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TLS: conn.(*tls.Conn).ConnectionState(),
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}
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2020-10-27 17:30:35 +00:00
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resp := s.responder(req)
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if resp != nil {
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resp.Respond(w, req)
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} else {
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w.WriteStatus(StatusNotFound)
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}
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2020-10-21 20:28:50 +00:00
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}
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w.b.Flush()
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conn.Close()
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}
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func (s *Server) responder(r *Request) Responder {
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if h, ok := s.responders[responderKey{r.URL.Scheme, r.URL.Hostname(), false}]; ok {
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return h
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}
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wildcard := strings.SplitN(r.URL.Hostname(), ".", 2)
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if len(wildcard) == 2 {
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if h, ok := s.responders[responderKey{r.URL.Scheme, wildcard[1], true}]; ok {
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return h
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}
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}
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2020-10-27 17:30:35 +00:00
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return nil
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}
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// ResponseWriter is used by a Gemini handler to construct a Gemini response.
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type ResponseWriter struct {
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b *bufio.Writer
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bodyAllowed bool
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2020-09-28 01:53:58 +00:00
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wroteHeader bool
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mimetype string
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2020-09-25 23:06:56 +00:00
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}
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func newResponseWriter(conn net.Conn) *ResponseWriter {
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return &ResponseWriter{
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2020-10-14 01:00:07 +00:00
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b: bufio.NewWriter(conn),
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2020-09-25 23:06:56 +00:00
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}
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}
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// WriteHeader writes the response header.
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2020-09-28 01:53:58 +00:00
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// If the header has already been written, WriteHeader does nothing.
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2020-09-25 23:06:56 +00:00
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//
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// Meta contains more information related to the response status.
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// For successful responses, Meta should contain the mimetype of the response.
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// For failure responses, Meta should contain a short description of the failure.
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// Meta should not be longer than 1024 bytes.
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2020-10-27 17:30:35 +00:00
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func (w *ResponseWriter) WriteHeader(status Status, meta string) {
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2020-10-14 01:00:07 +00:00
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if w.wroteHeader {
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2020-09-28 01:53:58 +00:00
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return
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}
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2020-10-27 17:30:35 +00:00
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w.b.WriteString(strconv.Itoa(int(status)))
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2020-10-14 01:00:07 +00:00
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w.b.WriteByte(' ')
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w.b.WriteString(meta)
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w.b.Write(crlf)
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2020-09-25 23:06:56 +00:00
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// Only allow body to be written on successful status codes.
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2020-10-27 17:30:35 +00:00
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if status.Class() == StatusClassSuccess {
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2020-10-14 01:00:07 +00:00
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w.bodyAllowed = true
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2020-09-25 23:06:56 +00:00
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}
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2020-10-14 01:00:07 +00:00
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w.wroteHeader = true
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2020-09-28 01:53:58 +00:00
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}
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2020-10-27 17:30:35 +00:00
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// WriteStatus writes the response header with the given status code.
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func (w *ResponseWriter) WriteStatus(status Status) {
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w.WriteHeader(status, status.Message())
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}
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2020-09-28 01:53:58 +00:00
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// SetMimetype sets the mimetype that will be written for a successful response.
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// The provided mimetype will only be used if Write is called without calling
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// WriteHeader.
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// If the mimetype is not set, it will default to "text/gemini".
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2020-10-14 01:00:07 +00:00
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func (w *ResponseWriter) SetMimetype(mimetype string) {
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w.mimetype = mimetype
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2020-09-25 23:06:56 +00:00
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}
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// Write writes the response body.
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// If the response status does not allow for a response body, Write returns
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// ErrBodyNotAllowed.
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2020-09-28 01:53:58 +00:00
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//
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// If WriteHeader has not yet been called, Write calls
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// WriteHeader(StatusSuccess, mimetype) where mimetype is the mimetype set in
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// SetMimetype. If no mimetype is set, a default of "text/gemini" will be used.
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2020-10-14 01:00:07 +00:00
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func (w *ResponseWriter) Write(b []byte) (int, error) {
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if !w.wroteHeader {
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mimetype := w.mimetype
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2020-09-28 02:03:09 +00:00
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if mimetype == "" {
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mimetype = "text/gemini"
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2020-09-28 01:53:58 +00:00
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}
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w.WriteHeader(StatusSuccess, mimetype)
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}
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if !w.bodyAllowed {
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return 0, ErrBodyNotAllowed
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}
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return w.b.Write(b)
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2020-09-25 23:06:56 +00:00
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}
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// A Responder responds to a Gemini request.
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type Responder interface {
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// Respond accepts a Request and constructs a Response.
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Respond(*ResponseWriter, *Request)
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2020-09-25 23:06:56 +00:00
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}
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2020-10-21 21:34:07 +00:00
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// Input returns the request query.
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// If no input is provided, it responds with StatusInput.
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func Input(w *ResponseWriter, r *Request, prompt string) (string, bool) {
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if r.URL.ForceQuery || r.URL.RawQuery != "" {
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2020-10-28 03:35:22 +00:00
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query, err := url.QueryUnescape(r.URL.RawQuery)
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return query, err == nil
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2020-09-28 06:05:37 +00:00
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}
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2020-10-21 21:34:07 +00:00
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w.WriteHeader(StatusInput, prompt)
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return "", false
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2020-09-28 06:05:37 +00:00
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}
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2020-10-21 21:34:07 +00:00
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// SensitiveInput returns the request query.
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// If no input is provided, it responds with StatusSensitiveInput.
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func SensitiveInput(w *ResponseWriter, r *Request, prompt string) (string, bool) {
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if r.URL.ForceQuery || r.URL.RawQuery != "" {
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2020-10-28 03:35:22 +00:00
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query, err := url.QueryUnescape(r.URL.RawQuery)
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return query, err == nil
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2020-09-28 06:05:37 +00:00
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}
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2020-10-24 19:15:32 +00:00
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w.WriteHeader(StatusSensitiveInput, prompt)
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2020-10-21 21:34:07 +00:00
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return "", false
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}
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2020-09-28 02:13:50 +00:00
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// Redirect replies to the request with a redirect to the given URL.
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2020-10-27 17:30:35 +00:00
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func Redirect(w *ResponseWriter, url string) {
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2020-10-14 00:22:12 +00:00
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w.WriteHeader(StatusRedirect, url)
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}
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2020-09-28 02:06:08 +00:00
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// PermanentRedirect replies to the request with a permanent redirect to the given URL.
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2020-10-27 17:30:35 +00:00
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func PermanentRedirect(w *ResponseWriter, url string) {
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2020-10-14 00:22:12 +00:00
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w.WriteHeader(StatusRedirectPermanent, url)
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2020-09-28 00:52:24 +00:00
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}
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2020-10-21 21:47:34 +00:00
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// Certificate returns the request certificate. If one is not provided,
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// it returns nil and responds with StatusCertificateRequired.
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func Certificate(w *ResponseWriter, r *Request) (*x509.Certificate, bool) {
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2020-10-14 00:22:12 +00:00
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if len(r.TLS.PeerCertificates) == 0 {
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2020-10-27 17:30:35 +00:00
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w.WriteStatus(StatusCertificateRequired)
|
2020-10-21 21:47:34 +00:00
|
|
|
return nil, false
|
2020-09-28 05:10:36 +00:00
|
|
|
}
|
2020-10-21 21:47:34 +00:00
|
|
|
return r.TLS.PeerCertificates[0], true
|
2020-09-28 05:10:36 +00:00
|
|
|
}
|
|
|
|
|
2020-10-24 19:29:12 +00:00
|
|
|
// ResponderFunc is a wrapper around a bare function that implements Responder.
|
2020-10-21 20:28:50 +00:00
|
|
|
type ResponderFunc func(*ResponseWriter, *Request)
|
2020-09-25 23:06:56 +00:00
|
|
|
|
2020-10-21 20:28:50 +00:00
|
|
|
func (f ResponderFunc) Respond(w *ResponseWriter, r *Request) {
|
2020-10-14 00:22:12 +00:00
|
|
|
f(w, r)
|
2020-09-25 23:06:56 +00:00
|
|
|
}
|
2020-09-26 20:38:26 +00:00
|
|
|
|
2020-09-28 07:15:19 +00:00
|
|
|
// The following code is modified from the net/http package.
|
|
|
|
|
2020-10-14 00:36:47 +00:00
|
|
|
// Copyright 2009 The Go Authors. All rights reserved.
|
|
|
|
// Use of this source code is governed by a BSD-style
|
|
|
|
// license that can be found in the LICENSE file.
|
|
|
|
|
2020-09-28 07:15:19 +00:00
|
|
|
// ServeMux is a Gemini request multiplexer.
|
|
|
|
// It matches the URL of each incoming request against a list of registered
|
|
|
|
// patterns and calls the handler for the pattern that
|
|
|
|
// most closely matches the URL.
|
|
|
|
//
|
|
|
|
// Patterns name fixed, rooted paths, like "/favicon.ico",
|
|
|
|
// or rooted subtrees, like "/images/" (note the trailing slash).
|
|
|
|
// Longer patterns take precedence over shorter ones, so that
|
|
|
|
// if there are handlers registered for both "/images/"
|
|
|
|
// and "/images/thumbnails/", the latter handler will be
|
|
|
|
// called for paths beginning "/images/thumbnails/" and the
|
|
|
|
// former will receive requests for any other paths in the
|
|
|
|
// "/images/" subtree.
|
|
|
|
//
|
|
|
|
// Note that since a pattern ending in a slash names a rooted subtree,
|
|
|
|
// the pattern "/" matches all paths not matched by other registered
|
|
|
|
// patterns, not just the URL with Path == "/".
|
|
|
|
//
|
|
|
|
// If a subtree has been registered and a request is received naming the
|
|
|
|
// subtree root without its trailing slash, ServeMux redirects that
|
|
|
|
// request to the subtree root (adding the trailing slash). This behavior can
|
|
|
|
// be overridden with a separate registration for the path without
|
|
|
|
// the trailing slash. For example, registering "/images/" causes ServeMux
|
|
|
|
// to redirect a request for "/images" to "/images/", unless "/images" has
|
|
|
|
// been registered separately.
|
|
|
|
//
|
2020-10-11 22:57:04 +00:00
|
|
|
// ServeMux also takes care of sanitizing the URL request path and
|
|
|
|
// redirecting any request containing . or .. elements or repeated slashes
|
|
|
|
// to an equivalent, cleaner URL.
|
2020-09-28 07:15:19 +00:00
|
|
|
type ServeMux struct {
|
2020-10-11 21:53:22 +00:00
|
|
|
mu sync.RWMutex
|
|
|
|
m map[string]muxEntry
|
|
|
|
es []muxEntry // slice of entries sorted from longest to shortest.
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
type muxEntry struct {
|
2020-10-21 21:07:28 +00:00
|
|
|
r Responder
|
2020-09-28 07:15:19 +00:00
|
|
|
pattern string
|
|
|
|
}
|
|
|
|
|
|
|
|
// cleanPath returns the canonical path for p, eliminating . and .. elements.
|
|
|
|
func cleanPath(p string) string {
|
|
|
|
if p == "" {
|
|
|
|
return "/"
|
|
|
|
}
|
|
|
|
if p[0] != '/' {
|
|
|
|
p = "/" + p
|
|
|
|
}
|
|
|
|
np := path.Clean(p)
|
|
|
|
// path.Clean removes trailing slash except for root;
|
|
|
|
// put the trailing slash back if necessary.
|
|
|
|
if p[len(p)-1] == '/' && np != "/" {
|
|
|
|
// Fast path for common case of p being the string we want:
|
|
|
|
if len(p) == len(np)+1 && strings.HasPrefix(p, np) {
|
|
|
|
np = p
|
|
|
|
} else {
|
|
|
|
np += "/"
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return np
|
|
|
|
}
|
|
|
|
|
|
|
|
// Find a handler on a handler map given a path string.
|
|
|
|
// Most-specific (longest) pattern wins.
|
2020-10-21 21:07:28 +00:00
|
|
|
func (mux *ServeMux) match(path string) Responder {
|
2020-09-28 07:15:19 +00:00
|
|
|
// Check for exact match first.
|
2020-09-28 20:02:32 +00:00
|
|
|
v, ok := mux.m[path]
|
2020-09-28 07:15:19 +00:00
|
|
|
if ok {
|
2020-10-21 21:07:28 +00:00
|
|
|
return v.r
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
2020-09-28 20:02:32 +00:00
|
|
|
// Check for longest valid match. mux.es contains all patterns
|
2020-09-28 07:15:19 +00:00
|
|
|
// that end in / sorted from longest to shortest.
|
|
|
|
for _, e := range mux.es {
|
2020-09-28 20:02:32 +00:00
|
|
|
if strings.HasPrefix(path, e.pattern) {
|
2020-10-21 21:07:28 +00:00
|
|
|
return e.r
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
}
|
2020-10-21 21:07:28 +00:00
|
|
|
return nil
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// redirectToPathSlash determines if the given path needs appending "/" to it.
|
|
|
|
// This occurs when a handler for path + "/" was already registered, but
|
|
|
|
// not for path itself. If the path needs appending to, it creates a new
|
|
|
|
// URL, setting the path to u.Path + "/" and returning true to indicate so.
|
2020-10-11 21:53:22 +00:00
|
|
|
func (mux *ServeMux) redirectToPathSlash(path string, u *url.URL) (*url.URL, bool) {
|
2020-09-28 07:15:19 +00:00
|
|
|
mux.mu.RLock()
|
2020-10-11 21:53:22 +00:00
|
|
|
shouldRedirect := mux.shouldRedirectRLocked(path)
|
2020-09-28 07:15:19 +00:00
|
|
|
mux.mu.RUnlock()
|
|
|
|
if !shouldRedirect {
|
|
|
|
return u, false
|
|
|
|
}
|
|
|
|
path = path + "/"
|
|
|
|
u = &url.URL{Path: path, RawQuery: u.RawQuery}
|
|
|
|
return u, true
|
|
|
|
}
|
|
|
|
|
|
|
|
// shouldRedirectRLocked reports whether the given path and host should be redirected to
|
|
|
|
// path+"/". This should happen if a handler is registered for path+"/" but
|
|
|
|
// not path -- see comments at ServeMux.
|
2020-10-11 21:53:22 +00:00
|
|
|
func (mux *ServeMux) shouldRedirectRLocked(path string) bool {
|
|
|
|
if _, exist := mux.m[path]; exist {
|
|
|
|
return false
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
n := len(path)
|
|
|
|
if n == 0 {
|
|
|
|
return false
|
|
|
|
}
|
2020-10-11 21:53:22 +00:00
|
|
|
if _, exist := mux.m[path+"/"]; exist {
|
|
|
|
return path[n-1] != '/'
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
2020-10-21 21:07:28 +00:00
|
|
|
// Respond dispatches the request to the responder whose
|
|
|
|
// pattern most closely matches the request URL.
|
|
|
|
func (mux *ServeMux) Respond(w *ResponseWriter, r *Request) {
|
2020-09-28 20:02:32 +00:00
|
|
|
path := cleanPath(r.URL.Path)
|
2020-09-28 07:15:19 +00:00
|
|
|
|
|
|
|
// If the given path is /tree and its handler is not registered,
|
|
|
|
// redirect for /tree/.
|
2020-10-11 21:53:22 +00:00
|
|
|
if u, ok := mux.redirectToPathSlash(path, r.URL); ok {
|
2020-10-27 17:30:35 +00:00
|
|
|
Redirect(w, u.String())
|
2020-10-21 21:07:28 +00:00
|
|
|
return
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
2020-09-28 20:02:32 +00:00
|
|
|
if path != r.URL.Path {
|
2020-10-21 21:07:28 +00:00
|
|
|
u := *r.URL
|
|
|
|
u.Path = path
|
2020-10-27 17:30:35 +00:00
|
|
|
Redirect(w, u.String())
|
2020-10-21 21:07:28 +00:00
|
|
|
return
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
mux.mu.RLock()
|
|
|
|
defer mux.mu.RUnlock()
|
|
|
|
|
2020-10-21 21:07:28 +00:00
|
|
|
resp := mux.match(path)
|
|
|
|
if resp == nil {
|
2020-10-27 17:30:35 +00:00
|
|
|
w.WriteStatus(StatusNotFound)
|
2020-10-21 21:07:28 +00:00
|
|
|
return
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
2020-10-21 21:07:28 +00:00
|
|
|
resp.Respond(w, r)
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
2020-10-21 21:07:28 +00:00
|
|
|
// Handle registers the responder for the given pattern.
|
|
|
|
// If a responder already exists for pattern, Handle panics.
|
|
|
|
func (mux *ServeMux) Handle(pattern string, responder Responder) {
|
2020-09-28 07:15:19 +00:00
|
|
|
mux.mu.Lock()
|
|
|
|
defer mux.mu.Unlock()
|
|
|
|
|
|
|
|
if pattern == "" {
|
2020-10-24 19:15:32 +00:00
|
|
|
panic("gemini: invalid pattern")
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
2020-10-21 21:07:28 +00:00
|
|
|
if responder == nil {
|
2020-10-24 19:15:32 +00:00
|
|
|
panic("gemini: nil responder")
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
if _, exist := mux.m[pattern]; exist {
|
2020-10-24 19:15:32 +00:00
|
|
|
panic("gemini: multiple registrations for " + pattern)
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if mux.m == nil {
|
|
|
|
mux.m = make(map[string]muxEntry)
|
|
|
|
}
|
2020-10-21 21:07:28 +00:00
|
|
|
e := muxEntry{responder, pattern}
|
2020-09-28 07:15:19 +00:00
|
|
|
mux.m[pattern] = e
|
2020-09-28 20:02:32 +00:00
|
|
|
if pattern[len(pattern)-1] == '/' {
|
|
|
|
mux.es = appendSorted(mux.es, e)
|
|
|
|
}
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func appendSorted(es []muxEntry, e muxEntry) []muxEntry {
|
|
|
|
n := len(es)
|
|
|
|
i := sort.Search(n, func(i int) bool {
|
2020-09-28 20:02:32 +00:00
|
|
|
return len(es[i].pattern) < len(e.pattern)
|
2020-09-28 07:15:19 +00:00
|
|
|
})
|
|
|
|
if i == n {
|
|
|
|
return append(es, e)
|
|
|
|
}
|
|
|
|
// we now know that i points at where we want to insert
|
|
|
|
es = append(es, muxEntry{}) // try to grow the slice in place, any entry works.
|
2020-10-11 22:57:04 +00:00
|
|
|
copy(es[i+1:], es[i:]) // move shorter entries down
|
2020-09-28 07:15:19 +00:00
|
|
|
es[i] = e
|
|
|
|
return es
|
|
|
|
}
|
|
|
|
|
2020-10-21 21:07:28 +00:00
|
|
|
// HandleFunc registers the responder function for the given pattern.
|
|
|
|
func (mux *ServeMux) HandleFunc(pattern string, responder func(*ResponseWriter, *Request)) {
|
|
|
|
if responder == nil {
|
2020-10-24 19:15:32 +00:00
|
|
|
panic("gemini: nil responder")
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|
2020-10-21 21:07:28 +00:00
|
|
|
mux.Handle(pattern, ResponderFunc(responder))
|
2020-09-28 07:15:19 +00:00
|
|
|
}
|