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

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package handler
import (
"bytes"
"context"
"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"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
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) checkIsFolder(ctx context.Context, bucket, object string) *layer.ObjectInfo {
if ln := len(object); ln > 0 && object[ln-1:] != layer.PathSeparator {
return nil
}
_, dirname := layer.NameFromString(object)
params := &layer.ListObjectsParams{Bucket: bucket, Prefix: dirname, Delimiter: layer.PathSeparator}
if list, err := h.obj.ListObjects(ctx, params); err == nil && len(list.Objects) > 0 {
return &layer.ObjectInfo{
Bucket: bucket,
Name: object,
ContentType: "text/directory",
Owner: list.Objects[0].Owner,
Created: list.Objects[0].Created,
}
}
return nil
}
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 = h.checkIsFolder(r.Context(), bkt, obj); inf != nil {
// do nothing for folders
// h.log.Debug("found folder",
// zap.String("request_id", rid),
// zap.String("bucket_name", bkt),
// zap.String("object_name", obj))
} else 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))
api.WriteErrorResponse(r.Context(), w, api.Error{
Code: api.GetAPIError(api.ErrInternalError).Code,
Description: err.Error(),
HTTPStatusCode: http.StatusInternalServerError,
}, 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, api.Error{
Code: api.GetAPIError(api.ErrInternalError).Code,
Description: err.Error(),
HTTPStatusCode: http.StatusInternalServerError,
}, 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 st, ok := status.FromError(err); ok && st != nil {
2021-05-13 19:15:21 +00:00
switch st.Code() { //nolint:exhaustive // we have default value set above
case codes.NotFound:
code = http.StatusNotFound
case codes.PermissionDenied:
code = http.StatusForbidden
}
}
api.WriteResponse(w, code, nil, api.MimeNone)
return
}
api.WriteResponse(w, http.StatusOK, nil, api.MimeNone)
}