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

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package handler
import (
"fmt"
"net/http"
"strconv"
"strings"
"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"
)
type (
GetObjectAttributesResponse struct {
ETag string `xml:"ETag,omitempty"`
ObjectSize int64 `xml:"ObjectSize,omitempty"`
StorageClass string `xml:"StorageClass,omitempty"`
ObjectParts *ObjectParts `xml:"ObjectParts,omitempty"`
}
ObjectParts struct {
IsTruncated bool `xml:"IsTruncated,omitempty"`
MaxParts int `xml:"MaxParts,omitempty"`
NextPartNumberMarker int `xml:"NextPartNumberMarker,omitempty"`
PartNumberMarker int `xml:"PartNumberMarker,omitempty"`
Parts []Part `xml:"Part,omitempty"`
PartsCount int `xml:"PartsCount,omitempty"`
}
Part struct {
PartNumber int `xml:"PartNumber,omitempty"`
Size int `xml:"Size,omitempty"`
}
GetObjectAttributesArgs struct {
MaxParts int
PartNumberMarker int
Attributes []string
VersionID string
Conditional *conditionalArgs
}
)
const (
partNumberMarkerDefault = -1
eTag = "ETag"
checksum = "Checksum"
objectParts = "ObjectParts"
storageClass = "StorageClass"
objectSize = "ObjectSize"
)
var validAttributes = map[string]struct{}{
eTag: {},
checksum: {},
objectParts: {},
storageClass: {},
objectSize: {},
}
func (h *handler) GetObjectAttributesHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
info *data.ObjectInfo
reqInfo = api.GetReqInfo(r.Context())
)
params, err := parseGetObjectAttributeArgs(r)
if err != nil {
h.logAndSendError(w, "invalid request", reqInfo, err)
return
}
bktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket info", reqInfo, err)
return
}
p := &layer.HeadObjectParams{
BktInfo: bktInfo,
Object: reqInfo.ObjectName,
VersionID: params.VersionID,
}
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, params.Conditional); err != nil {
h.logAndSendError(w, "precondition failed", reqInfo, err)
return
}
response, err := encodeToObjectAttributesResponse(info, params)
if err != nil {
h.logAndSendError(w, "couldn't encode object info to response", reqInfo, err)
return
}
writeAttributesHeaders(w.Header(), info, params)
if err = api.EncodeToResponse(w, response); err != nil {
h.logAndSendError(w, "something went wrong", reqInfo, err)
}
}
func writeAttributesHeaders(h http.Header, info *data.ObjectInfo, params *GetObjectAttributesArgs) {
h.Set(api.LastModified, info.Created.UTC().Format(http.TimeFormat))
if len(params.VersionID) != 0 {
h.Set(api.AmzVersionID, info.Version())
}
if info.IsDeleteMarker {
h.Set(api.AmzDeleteMarker, strconv.FormatBool(true))
}
// x-amz-request-charged
}
func parseGetObjectAttributeArgs(r *http.Request) (*GetObjectAttributesArgs, error) {
var (
err error
res = &GetObjectAttributesArgs{}
attributesVal = r.Header.Get("X-Amz-Object-Attributes")
maxPartsVal = r.Header.Get("X-Amz-Max-Parts")
markerVal = r.Header.Get("X-Amz-Part-Number-Marker")
queryValues = r.URL.Query()
)
if attributesVal == "" {
return nil, errors.GetAPIError(errors.ErrInvalidAttributeName)
}
attributes := strings.Split(attributesVal, ",")
for _, a := range attributes {
if _, ok := validAttributes[a]; !ok {
return nil, errors.GetAPIError(errors.ErrInvalidAttributeName)
}
res.Attributes = append(res.Attributes, a)
}
if maxPartsVal == "" {
res.MaxParts = layer.MaxSizePartsList
} else if res.MaxParts, err = strconv.Atoi(maxPartsVal); err != nil || res.MaxParts < 0 {
return nil, errors.GetAPIError(errors.ErrInvalidMaxKeys)
}
if markerVal == "" {
res.PartNumberMarker = partNumberMarkerDefault
} else if res.PartNumberMarker, err = strconv.Atoi(markerVal); err != nil || res.PartNumberMarker < 0 {
return nil, errors.GetAPIError(errors.ErrInvalidPartNumberMarker)
}
res.VersionID = queryValues.Get(api.QueryVersionID)
res.Conditional, err = parseConditionalHeaders(r.Header)
return res, err
}
func encodeToObjectAttributesResponse(info *data.ObjectInfo, p *GetObjectAttributesArgs) (*GetObjectAttributesResponse, error) {
resp := &GetObjectAttributesResponse{}
for _, attr := range p.Attributes {
switch attr {
case eTag:
resp.ETag = info.HashSum
case storageClass:
resp.StorageClass = "STANDARD"
case objectSize:
resp.ObjectSize = info.Size
case objectParts:
parts, err := formUploadAttributes(info, p.MaxParts, p.PartNumberMarker)
if err != nil {
return nil, fmt.Errorf("form upload attributes: %w", err)
}
if parts != nil {
resp.ObjectParts = parts
}
}
}
return resp, nil
}
func formUploadAttributes(info *data.ObjectInfo, maxParts, marker int) (*ObjectParts, error) {
res := ObjectParts{}
if _, ok := info.Headers[layer.UploadIDAttributeName]; !ok {
return nil, nil
}
parts := make([]Part, 0)
val, ok := info.Headers[layer.UploadCompletedParts]
if ok {
pairs := strings.Split(val, ",")
for _, p := range pairs {
// nums[0] -- part number, nums[1] -- part size
nums := strings.Split(p, "=")
if len(nums) != 2 {
return nil, nil
}
num, err := strconv.Atoi(nums[0])
if err != nil {
return nil, err
}
size, err := strconv.Atoi(nums[1])
if err != nil {
return nil, fmt.Errorf("parse part size: %w", err)
}
parts = append(parts, Part{PartNumber: num, Size: size})
}
}
res.PartsCount = len(parts)
if marker != partNumberMarkerDefault {
res.PartNumberMarker = marker
for i, n := range parts {
if n.PartNumber == marker {
parts = parts[i:]
break
}
}
}
res.MaxParts = maxParts
if len(parts) > maxParts {
res.IsTruncated = true
res.NextPartNumberMarker = parts[maxParts].PartNumber
parts = parts[:maxParts]
}
res.Parts = parts
return &res, nil
}