frostfs-s3-gw/api/host_bucket_router.go

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package api
import (
"net/http"
"strings"
"github.com/go-chi/chi/v5"
)
type HostBucketRouter struct {
routes map[string]chi.Router
bktParam string
defaultRouter chi.Router
}
func NewHostBucketRouter(bktParam string) HostBucketRouter {
return HostBucketRouter{
routes: make(map[string]chi.Router),
bktParam: bktParam,
}
}
func (hr *HostBucketRouter) Default(router chi.Router) {
hr.defaultRouter = router
}
func (hr HostBucketRouter) Map(host string, h chi.Router) {
hr.routes[strings.ToLower(host)] = h
}
func (hr HostBucketRouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
bucket, domain := getBucketDomain(getHost(r))
router, ok := hr.routes[strings.ToLower(domain)]
if !ok {
router = hr.defaultRouter
if router == nil {
http.Error(w, http.StatusText(404), 404)
return
}
}
if rctx := chi.RouteContext(r.Context()); rctx != nil && bucket != "" {
rctx.URLParams.Add(hr.bktParam, bucket)
}
router.ServeHTTP(w, r)
}
func getBucketDomain(host string) (bucket string, domain string) {
parts := strings.Split(host, ".")
if len(parts) > 1 {
return parts[0], strings.Join(parts[1:], ".")
}
return "", host
}
// getHost tries its best to return the request host.
// According to section 14.23 of RFC 2616 the Host header
// can include the port number if the default value of 80 is not used.
func getHost(r *http.Request) string {
host := r.Host
if r.URL.IsAbs() {
host = r.URL.Host
}
if i := strings.Index(host, ":"); i != -1 {
host = host[:i]
}
return host
}