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

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package handler
import (
"net/http"
"net/url"
"strings"
"time"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
"github.com/nspcc-dev/neofs-s3-gw/api/layer"
"go.uber.org/zap"
)
type copyObjectArgs struct {
Conditional *conditionalArgs
MetadataDirective string
}
const replaceMetadataDirective = "REPLACE"
// path2BucketObject returns bucket and object.
func path2BucketObject(path string) (bucket, prefix string) {
path = strings.TrimPrefix(path, api.SlashSeparator)
m := strings.Index(path, api.SlashSeparator)
if m < 0 {
return path, ""
}
return path[:m], path[m+len(api.SlashSeparator):]
}
func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
info *api.ObjectInfo
metadata map[string]string
reqInfo = api.GetReqInfo(r.Context())
versionID string
)
src := r.Header.Get("X-Amz-Copy-Source")
// Check https://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectVersioning.html
// Regardless of whether you have enabled versioning, each object in your bucket
// has a version ID. If you have not enabled versioning, Amazon S3 sets the value
// of the version ID to null. If you have enabled versioning, Amazon S3 assigns a
// unique version ID value for the object.
if u, err := url.Parse(src); err == nil {
versionID = u.Query().Get(api.QueryVersionID)
src = u.Path
}
srcBucket, srcObject := path2BucketObject(src)
args, err := parseCopyObjectArgs(r.Header)
if err != nil {
h.logAndSendError(w, "could not parse request params", reqInfo, err)
return
}
p := &layer.HeadObjectParams{
Bucket: srcBucket,
Object: srcObject,
VersionID: versionID,
}
if args.MetadataDirective == replaceMetadataDirective {
metadata = parseMetadata(r)
} else if srcBucket == reqInfo.BucketName && srcObject == reqInfo.ObjectName {
h.logAndSendError(w, "could not copy to itself", reqInfo, errors.GetAPIError(errors.ErrInvalidRequest))
return
}
if err = h.checkBucketOwner(r, srcBucket, r.Header.Get(api.AmzSourceExpectedBucketOwner)); err != nil {
h.logAndSendError(w, "source expected owner doesn't match", reqInfo, err)
return
}
if err = h.checkBucketOwner(r, reqInfo.BucketName); err != nil {
h.logAndSendError(w, "expected owner doesn't match", reqInfo, err)
return
}
if info, err = h.obj.GetObjectInfo(r.Context(), p); err != nil {
h.logAndSendError(w, "could not find object", reqInfo, err)
return
}
if err = checkPreconditions(info, args.Conditional); err != nil {
h.logAndSendError(w, "precondition failed", reqInfo, errors.GetAPIError(errors.ErrPreconditionFailed))
return
}
if metadata == nil {
if len(info.ContentType) > 0 {
info.Headers[api.ContentType] = info.ContentType
}
metadata = info.Headers
} else if contentType := r.Header.Get(api.ContentType); len(contentType) > 0 {
metadata[api.ContentType] = contentType
}
params := &layer.CopyObjectParams{
SrcObject: info,
DstBucket: reqInfo.BucketName,
DstObject: reqInfo.ObjectName,
SrcSize: info.Size,
Header: metadata,
}
additional := []zap.Field{zap.String("src_bucket_name", srcBucket), zap.String("src_object_name", srcObject)}
if info, err = h.obj.CopyObject(r.Context(), params); err != nil {
h.logAndSendError(w, "couldn't copy object", reqInfo, err, additional...)
return
} else if err = api.EncodeToResponse(w, &CopyObjectResponse{LastModified: info.Created.Format(time.RFC3339), ETag: info.HashSum}); err != nil {
h.logAndSendError(w, "something went wrong", reqInfo, err, additional...)
return
}
h.log.Info("object is copied",
zap.String("bucket", info.Bucket),
zap.String("object", info.Name),
zap.Stringer("object_id", info.ID))
}
func parseCopyObjectArgs(headers http.Header) (*copyObjectArgs, error) {
var err error
args := &conditionalArgs{
IfMatch: headers.Get(api.AmzCopyIfMatch),
IfNoneMatch: headers.Get(api.AmzCopyIfNoneMatch),
}
if args.IfModifiedSince, err = parseHTTPTime(headers.Get(api.AmzCopyIfModifiedSince)); err != nil {
return nil, err
}
if args.IfUnmodifiedSince, err = parseHTTPTime(headers.Get(api.AmzCopyIfUnmodifiedSince)); err != nil {
return nil, err
}
copyArgs := &copyObjectArgs{Conditional: args}
copyArgs.MetadataDirective = headers.Get(api.AmzMetadataDirective)
return copyArgs, nil
}