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

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package handler
import (
"io"
"net/http"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
"go.uber.org/zap"
)
const sizeToDetectType = 512
func getRangeToDetectContentType(maxSize uint64) *layer.RangeParams {
end := maxSize
if sizeToDetectType < end {
end = sizeToDetectType
}
return &layer.RangeParams{
Start: 0,
End: end - 1,
}
}
func (h *handler) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := middleware.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),
}
extendedInfo, err := h.obj.GetExtendedObjectInfo(r.Context(), p)
if err != nil {
h.logAndSendError(w, "could not find object", reqInfo, err)
return
}
info := extendedInfo.ObjectInfo
encryptionParams, err := formEncryptionParams(r)
if err != nil {
h.logAndSendError(w, "invalid sse headers", reqInfo, err)
return
}
if err = encryptionParams.MatchObjectEncryption(layer.FormEncryptionInfo(info.Headers)); err != nil {
h.logAndSendError(w, "encryption doesn't match object", reqInfo, errors.GetAPIError(errors.ErrBadRequest), zap.Error(err))
return
}
if err = checkPreconditions(info, conditional, h.cfg.MD5Enabled()); err != nil {
h.logAndSendError(w, "precondition failed", reqInfo, err)
return
}
t := &data.ObjectVersion{
BktInfo: bktInfo,
ObjectName: info.Name,
VersionID: info.VersionID(),
}
tagSet, lockInfo, err := h.obj.GetObjectTaggingAndLock(r.Context(), t, extendedInfo.NodeVersion)
if err != nil && !errors.IsS3Error(err, errors.ErrNoSuchKey) {
h.logAndSendError(w, "could not get object meta data", reqInfo, err)
return
}
if len(info.ContentType) == 0 {
if info.ContentType = layer.MimeByFilePath(info.Name); len(info.ContentType) == 0 {
getParams := &layer.GetObjectParams{
ObjectInfo: info,
Versioned: p.Versioned(),
Range: getRangeToDetectContentType(info.Size),
BucketInfo: bktInfo,
}
objPayload, err := h.obj.GetObject(r.Context(), getParams)
if err != nil {
h.logAndSendError(w, "could not get object", reqInfo, err, zap.Stringer("oid", info.ID))
return
}
buffer, err := io.ReadAll(objPayload)
if err != nil {
h.logAndSendError(w, "could not partly read payload to detect content type", reqInfo, err, zap.Stringer("oid", info.ID))
return
}
info.ContentType = http.DetectContentType(buffer)
}
}
if err = h.setLockingHeaders(bktInfo, lockInfo, w.Header()); err != nil {
h.logAndSendError(w, "could not get locking info", reqInfo, err)
return
}
bktSettings, err := h.obj.GetBucketSettings(r.Context(), bktInfo)
if err != nil {
h.logAndSendError(w, "could not get bucket settings", reqInfo, err)
return
}
writeHeaders(w.Header(), r.Header, extendedInfo, len(tagSet), bktSettings.Unversioned(), h.cfg.MD5Enabled())
w.WriteHeader(http.StatusOK)
}
func (h *handler) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := middleware.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.OwnerID, bktInfo.Owner.EncodeToString())
w.Header().Set(api.ContainerID, bktInfo.CID.EncodeToString())
w.Header().Set(api.AmzBucketRegion, bktInfo.LocationConstraint)
if isAvailableToResolve(bktInfo.Zone, h.cfg.ResolveZoneList(), h.cfg.IsResolveListAllow()) {
w.Header().Set(api.ContainerName, bktInfo.Name)
w.Header().Set(api.ContainerZone, bktInfo.Zone)
}
if err = middleware.WriteResponse(w, http.StatusOK, nil, middleware.MimeNone); err != nil {
h.logAndSendError(w, "write response", reqInfo, err)
return
}
}
func (h *handler) setLockingHeaders(bktInfo *data.BucketInfo, lockInfo data.LockInfo, header http.Header) error {
if !bktInfo.ObjectLockEnabled {
return nil
}
legalHold := &data.LegalHold{Status: legalHoldOff}
retention := &data.Retention{Mode: governanceMode}
if lockInfo.IsLegalHoldSet() {
legalHold.Status = legalHoldOn
}
if lockInfo.IsRetentionSet() {
retention.RetainUntilDate = lockInfo.UntilDate()
if lockInfo.IsCompliance() {
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)
}
}
func isAvailableToResolve(zone string, list []string, isAllowList bool) bool {
// empty zone means container doesn't have proper system name,
// so we don't have to resolve it
if len(zone) == 0 {
return false
}
var zoneInList bool
for _, t := range list {
if t == zone {
zoneInList = true
break
}
}
// InList | IsAllowList | Result
// 0 0 1
// 0 1 0
// 1 0 0
// 1 1 1
return zoneInList == isAllowList
}