package handler import ( "bytes" "context" "net/http" "github.com/nspcc-dev/neofs-s3-gw/api" "github.com/nspcc-dev/neofs-s3-gw/api/data" "github.com/nspcc-dev/neofs-s3-gw/api/errors" "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 info *data.ObjectInfo reqInfo = api.GetReqInfo(r.Context()) ) bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName) if err != nil { h.logAndSendError(w, "could not get bucket info", reqInfo, err) return } conditional, err := parseConditionalHeaders(r.Header) if err != nil { h.logAndSendError(w, "could not parse request params", reqInfo, err) return } p := &layer.HeadObjectParams{ BktInfo: bktInfo, Object: reqInfo.ObjectName, VersionID: reqInfo.URL.Query().Get(api.QueryVersionID), } if info, err = h.obj.GetObjectInfo(r.Context(), p); err != nil { h.logAndSendError(w, "could not fetch object info", reqInfo, err) return } if err = checkPreconditions(info, conditional); err != nil { h.logAndSendError(w, "precondition failed", reqInfo, err) return } tagSet, err := h.obj.GetObjectTagging(r.Context(), info) if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) { h.logAndSendError(w, "could not get object tag set", reqInfo, err) return } if len(info.ContentType) == 0 { buffer := bytes.NewBuffer(make([]byte, 0, sizeToDetectType)) getParams := &layer.GetObjectParams{ ObjectInfo: info, Writer: buffer, Range: getRangeToDetectContentType(info.Size), VersionID: reqInfo.URL.Query().Get(api.QueryVersionID), } if err = h.obj.GetObject(r.Context(), getParams); err != nil { h.logAndSendError(w, "could not get object", reqInfo, err, zap.Stringer("oid", info.ID)) return } info.ContentType = http.DetectContentType(buffer.Bytes()) } if err = h.setLockingHeaders(r.Context(), bktInfo, info, w.Header()); err != nil { h.logAndSendError(w, "could not get locking info", reqInfo, err) return } writeHeaders(w.Header(), info, len(tagSet)) w.WriteHeader(http.StatusOK) } func (h *handler) HeadBucketHandler(w http.ResponseWriter, r *http.Request) { reqInfo := api.GetReqInfo(r.Context()) bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName) if err != nil { h.logAndSendError(w, "could not get bucket info", reqInfo, err) return } w.Header().Set(api.ContainerID, bktInfo.CID.EncodeToString()) api.WriteResponse(w, http.StatusOK, nil, api.MimeNone) } func (h *handler) setLockingHeaders(ctx context.Context, bktInfo *data.BucketInfo, objInfo *data.ObjectInfo, header http.Header) error { if !bktInfo.ObjectLockEnabled { return nil } legalHold := &data.LegalHold{Status: legalHoldOff} legalHoldInfo, err := h.obj.HeadSystemObject(ctx, bktInfo, objInfo.LegalHoldObject()) if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) { return err } if legalHoldInfo != nil { legalHold.Status = legalHoldOn } retention := &data.Retention{Mode: governanceMode} retentionInfo, err := h.obj.HeadSystemObject(ctx, bktInfo, objInfo.RetentionObject()) if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) { return err } if retentionInfo != nil { retention.RetainUntilDate = retentionInfo.Headers[layer.AttributeRetainUntil] if retentionInfo.Headers[layer.AttributeComplianceMode] != "" { retention.Mode = complianceMode } } writeLockHeaders(header, legalHold, retention) return nil } func writeLockHeaders(h http.Header, legalHold *data.LegalHold, retention *data.Retention) { h.Set(api.AmzObjectLockLegalHold, legalHold.Status) if retention.RetainUntilDate != "" { h.Set(api.AmzObjectLockRetainUntilDate, retention.RetainUntilDate) h.Set(api.AmzObjectLockMode, retention.Mode) } }