frostfs-s3-gw/api/handler/copy.go
Denis Kirillov 96c7b79d1c [#683] Forbid copy to itself in unversioned bucket
Signed-off-by: Denis Kirillov <denis@nspcc.ru>
2022-08-30 13:31:48 +03:00

293 lines
8.4 KiB
Go

package handler
import (
"net/http"
"net/url"
"regexp"
"time"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/api/auth"
"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"
"github.com/nspcc-dev/neofs-sdk-go/session"
"go.uber.org/zap"
)
type copyObjectArgs struct {
Conditional *conditionalArgs
MetadataDirective string
TaggingDirective string
}
const (
replaceDirective = "REPLACE"
copyDirective = "COPY"
)
var copySourceMatcher = auth.NewRegexpMatcher(regexp.MustCompile(`^/?(?P<bucket_name>[a-z0-9.\-]{3,63})/(?P<object_name>.+)$`))
// path2BucketObject returns a bucket and an object.
func path2BucketObject(path string) (string, string, error) {
matches := copySourceMatcher.GetSubmatches(path)
if len(matches) != 2 {
return "", "", errors.GetAPIError(errors.ErrInvalidRequest)
}
return matches["bucket_name"], matches["object_name"], nil
}
func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
var (
err error
versionID string
metadata map[string]string
tagSet map[string]string
sessionTokenEACL *session.Container
reqInfo = api.GetReqInfo(r.Context())
containsACL = containsACLHeaders(r)
)
src := r.Header.Get(api.AmzCopySource)
// 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, err := path2BucketObject(src)
if err != nil {
h.logAndSendError(w, "invalid source copy", reqInfo, err)
return
}
p := &layer.HeadObjectParams{
Object: srcObject,
VersionID: versionID,
}
if p.BktInfo, err = h.getBucketAndCheckOwner(r, srcBucket, api.AmzSourceExpectedBucketOwner); err != nil {
h.logAndSendError(w, "couldn't get source bucket", reqInfo, err)
return
}
dstBktInfo, err := h.getBucketAndCheckOwner(r, reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "couldn't get target bucket", reqInfo, err)
return
}
settings, err := h.obj.GetBucketSettings(r.Context(), dstBktInfo)
if err != nil {
h.logAndSendError(w, "could not get bucket settings", reqInfo, err)
return
}
if containsACL {
if sessionTokenEACL, err = getSessionTokenSetEACL(r.Context()); err != nil {
h.logAndSendError(w, "could not get eacl session token from a box", reqInfo, err)
return
}
}
objInfo, err := h.obj.GetObjectInfo(r.Context(), p)
if err != nil {
h.logAndSendError(w, "could not find object", reqInfo, err)
return
}
args, err := parseCopyObjectArgs(r.Header)
if err != nil {
h.logAndSendError(w, "could not parse request params", reqInfo, err)
return
}
if isCopyingToItselfForbidden(reqInfo, srcBucket, srcObject, settings, args) {
h.logAndSendError(w, "copying to itself without changing anything", reqInfo, errors.GetAPIError(errors.ErrInvalidCopyDest))
return
}
if args.MetadataDirective == replaceDirective {
metadata = parseMetadata(r)
}
if args.TaggingDirective == replaceDirective {
tagSet, err = parseTaggingHeader(r.Header)
if err != nil {
h.logAndSendError(w, "could not parse tagging header", reqInfo, err)
return
}
} else {
objVersion := &layer.ObjectVersion{
BktInfo: p.BktInfo,
ObjectName: srcObject,
VersionID: objInfo.VersionID(),
}
_, tagSet, err = h.obj.GetObjectTagging(r.Context(), objVersion)
if err != nil {
h.logAndSendError(w, "could not get object tagging", reqInfo, err)
return
}
}
encryptionParams, err := h.formEncryptionParams(r.Header)
if err != nil {
h.logAndSendError(w, "invalid sse headers", reqInfo, err)
return
}
if err = encryptionParams.MatchObjectEncryption(layer.FormEncryptionInfo(objInfo.Headers)); err != nil {
h.logAndSendError(w, "encryption doesn't match object", reqInfo, errors.GetAPIError(errors.ErrBadRequest), zap.Error(err))
return
}
if err = checkPreconditions(objInfo, args.Conditional); err != nil {
h.logAndSendError(w, "precondition failed", reqInfo, errors.GetAPIError(errors.ErrPreconditionFailed))
return
}
if metadata == nil {
if len(objInfo.ContentType) > 0 {
objInfo.Headers[api.ContentType] = objInfo.ContentType
}
metadata = objInfo.Headers
} else if contentType := r.Header.Get(api.ContentType); len(contentType) > 0 {
metadata[api.ContentType] = contentType
}
copiesNumber, err := getCopiesNumberOrDefault(metadata, h.cfg.CopiesNumber)
if err != nil {
h.logAndSendError(w, "invalid copies number", reqInfo, err)
return
}
params := &layer.CopyObjectParams{
SrcObject: objInfo,
ScrBktInfo: p.BktInfo,
DstBktInfo: dstBktInfo,
DstObject: reqInfo.ObjectName,
SrcSize: objInfo.Size,
Header: metadata,
Encryption: encryptionParams,
CopiesNuber: copiesNumber,
}
params.Lock, err = formObjectLock(dstBktInfo, settings.LockConfiguration, r.Header)
if err != nil {
h.logAndSendError(w, "could not form object lock", reqInfo, err)
return
}
additional := []zap.Field{zap.String("src_bucket_name", srcBucket), zap.String("src_object_name", srcObject)}
if objInfo, 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: objInfo.Created.UTC().Format(time.RFC3339), ETag: objInfo.HashSum}); err != nil {
h.logAndSendError(w, "something went wrong", reqInfo, err, additional...)
return
}
if containsACL {
newEaclTable, err := h.getNewEAclTable(r, dstBktInfo, objInfo)
if err != nil {
h.logAndSendError(w, "could not get new eacl table", reqInfo, err)
return
}
p := &layer.PutBucketACLParams{
BktInfo: dstBktInfo,
EACL: newEaclTable,
SessionToken: sessionTokenEACL,
}
if err = h.obj.PutBucketACL(r.Context(), p); err != nil {
h.logAndSendError(w, "could not put bucket acl", reqInfo, err)
return
}
}
if tagSet != nil {
t := &layer.ObjectVersion{
BktInfo: dstBktInfo,
ObjectName: reqInfo.ObjectName,
VersionID: objInfo.VersionID(),
}
if _, err = h.obj.PutObjectTagging(r.Context(), t, tagSet); err != nil {
h.logAndSendError(w, "could not upload object tagging", reqInfo, err)
return
}
}
h.log.Info("object is copied",
zap.String("bucket", objInfo.Bucket),
zap.String("object", objInfo.Name),
zap.Stringer("object_id", objInfo.ID))
s := &SendNotificationParams{
Event: EventObjectCreatedCopy,
NotificationInfo: data.NotificationInfoFromObject(objInfo),
BktInfo: dstBktInfo,
ReqInfo: reqInfo,
}
if err = h.sendNotifications(r.Context(), s); err != nil {
h.log.Error("couldn't send notification: %w", zap.Error(err))
}
if encryptionParams.Enabled() {
addSSECHeaders(w.Header(), r.Header)
}
}
func isCopyingToItselfForbidden(reqInfo *api.ReqInfo, srcBucket string, srcObject string, settings *data.BucketSettings, args *copyObjectArgs) bool {
if reqInfo.BucketName != srcBucket || reqInfo.ObjectName != srcObject {
return false
}
if !settings.Unversioned() {
return false
}
return args.MetadataDirective != replaceDirective
}
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)
if !isValidDirective(copyArgs.MetadataDirective) {
return nil, errors.GetAPIError(errors.ErrInvalidMetadataDirective)
}
copyArgs.TaggingDirective = headers.Get(api.AmzTaggingDirective)
if !isValidDirective(copyArgs.TaggingDirective) {
return nil, errors.GetAPIError(errors.ErrInvalidTaggingDirective)
}
return copyArgs, nil
}
func isValidDirective(directive string) bool {
return len(directive) == 0 ||
directive == replaceDirective || directive == copyDirective
}