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

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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)
}
}