// resolveOnce implements resolver.
// TXT records for a given domain name should contain a b58
// encoded multihash.
func (r *DNSResolver) resolveOnce(ctx context.Context, name string) (path.Path, error) {
if !isd.IsDomain(name) {
return "", errors.New("not a valid domain name")
}
log.Infof("DNSResolver resolving %s", name)
txt, err := r.lookupTXT(name)
if err != nil {
return "", err
}
for _, t := range txt {
p, err := parseEntry(t)
if err == nil {
return p, nil
}
}
return "", ErrResolveFailed
}
// IPNSHostnameOption rewrites an incoming request if its Host: header contains
// an IPNS name.
// The rewritten request points at the resolved name on the gateway handler.
func IPNSHostnameOption() ServeOption {
return func(n *core.IpfsNode, _ net.Listener, mux *http.ServeMux) (*http.ServeMux, error) {
childMux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithCancel(n.Context())
defer cancel()
host := strings.SplitN(r.Host, ":", 2)[0]
if len(host) > 0 && isd.IsDomain(host) {
name := "/ipns/" + host
if _, err := n.Namesys.Resolve(ctx, name); err == nil {
r.Header["X-IPNS-Original-Path"] = []string{r.URL.Path}
r.URL.Path = name + r.URL.Path
}
}
childMux.ServeHTTP(w, r)
})
return childMux, nil
}
}