114 lines
2.4 KiB
Go
114 lines
2.4 KiB
Go
package putsvc
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import (
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"bytes"
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"crypto/sha256"
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"errors"
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"fmt"
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"hash"
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"github.com/nspcc-dev/neofs-node/pkg/core/object"
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"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/transformer"
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"github.com/nspcc-dev/neofs-sdk-go/checksum"
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"github.com/nspcc-dev/tzhash/tz"
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)
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type validatingTarget struct {
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nextTarget transformer.ObjectTarget
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fmt *object.FormatValidator
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hash hash.Hash
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checksum []byte
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maxPayloadSz uint64 // network config
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payloadSz uint64 // payload size of the streaming object from header
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writtenPayload uint64 // number of already written payload bytes
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}
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// errors related to invalid payload size
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var (
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ErrExceedingMaxSize = errors.New("payload size is greater than the limit")
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ErrWrongPayloadSize = errors.New("wrong payload size")
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)
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func (t *validatingTarget) WriteHeader(obj *object.RawObject) error {
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t.payloadSz = obj.PayloadSize()
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chunkLn := uint64(len(obj.Payload()))
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// check chunk size
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if chunkLn > t.payloadSz {
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return ErrWrongPayloadSize
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}
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// check payload size limit
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if t.payloadSz > t.maxPayloadSz {
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return ErrExceedingMaxSize
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}
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cs := obj.PayloadChecksum()
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switch typ := cs.Type(); typ {
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default:
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return fmt.Errorf("(%T) unsupported payload checksum type %v", t, typ)
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case checksum.SHA256:
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t.hash = sha256.New()
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case checksum.TZ:
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t.hash = tz.New()
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}
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t.checksum = cs.Sum()
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if err := t.fmt.Validate(obj.Object()); err != nil {
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return fmt.Errorf("(%T) coult not validate object format: %w", t, err)
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}
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err := t.nextTarget.WriteHeader(obj)
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if err != nil {
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return err
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}
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// update written bytes
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//
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// Note: we MUST NOT add obj.PayloadSize() since obj
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// can carry only the chunk of the full payload
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t.writtenPayload += chunkLn
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return nil
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}
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func (t *validatingTarget) Write(p []byte) (n int, err error) {
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chunkLn := uint64(len(p))
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// check if new chunk will overflow payload size
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if t.writtenPayload+chunkLn > t.payloadSz {
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return 0, ErrWrongPayloadSize
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}
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_, err = t.hash.Write(p)
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if err != nil {
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return
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}
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n, err = t.nextTarget.Write(p)
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if err == nil {
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t.writtenPayload += uint64(n)
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}
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return
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}
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func (t *validatingTarget) Close() (*transformer.AccessIdentifiers, error) {
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// check payload size correctness
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if t.payloadSz != t.writtenPayload {
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return nil, ErrWrongPayloadSize
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}
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if !bytes.Equal(t.hash.Sum(nil), t.checksum) {
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return nil, fmt.Errorf("(%T) incorrect payload checksum", t)
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}
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return t.nextTarget.Close()
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}
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