frostfs-s3-gw/api/handler/head.go

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package handler
import (
"bytes"
"errors"
"net/http"
"github.com/gorilla/mux"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/api/layer"
"go.uber.org/zap"
)
const sizeToDetectType = 512
func getRangeToDetectContentType(maxSize int64) *layer.RangeParams {
end := uint64(maxSize)
if sizeToDetectType < end {
end = sizeToDetectType
}
return &layer.RangeParams{
Start: 0,
End: end - 1,
}
}
func (h *handler) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
inf *layer.ObjectInfo
req = mux.Vars(r)
bkt = req["bucket"]
obj = req["object"]
rid = api.GetRequestID(r.Context())
)
if inf, err = h.obj.GetObjectInfo(r.Context(), bkt, obj); err != nil {
h.log.Error("could not fetch object info",
zap.String("request_id", rid),
zap.String("bucket_name", bkt),
zap.String("object_name", obj),
zap.Error(err))
var genErr *api.ObjectNotFound
if ok := errors.As(err, &genErr); ok {
err = api.GetAPIError(api.ErrNoSuchKey)
}
api.WriteErrorResponse(r.Context(), w, err, r.URL)
return
}
buffer := bytes.NewBuffer(make([]byte, 0, sizeToDetectType))
getParams := &layer.GetObjectParams{
Bucket: inf.Bucket,
Object: inf.Name,
Writer: buffer,
Range: getRangeToDetectContentType(inf.Size),
}
if err = h.obj.GetObject(r.Context(), getParams); err != nil {
h.log.Error("could not get object",
zap.String("request_id", rid),
zap.String("bucket_name", bkt),
zap.String("object_name", obj),
zap.Stringer("oid", inf.ID()),
zap.Error(err))
api.WriteErrorResponse(r.Context(), w, err, r.URL)
return
}
inf.ContentType = http.DetectContentType(buffer.Bytes())
writeHeaders(w.Header(), inf)
w.WriteHeader(http.StatusOK)
}
func (h *handler) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
var (
req = mux.Vars(r)
bkt = req["bucket"]
rid = api.GetRequestID(r.Context())
)
if _, err := h.obj.GetBucketInfo(r.Context(), bkt); err != nil {
h.log.Error("could not fetch object info",
zap.String("request_id", rid),
zap.String("bucket_name", bkt),
zap.Error(err))
code := http.StatusBadRequest
if errors.Is(err, layer.ErrBucketNotFound) {
code = http.StatusNotFound
}
api.WriteResponse(w, code, nil, api.MimeNone)
return
}
api.WriteResponse(w, http.StatusOK, nil, api.MimeNone)
}