121137c62b
Define object writer interface. Implement payload size limiter that restricts payload size of the object. Implement object format moulder that fill verification fields and finalizes object structure. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
package transformer
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import (
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"crypto/ecdsa"
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"github.com/nspcc-dev/neofs-api-go/pkg"
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objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
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"github.com/nspcc-dev/neofs-node/pkg/core/object"
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"github.com/pkg/errors"
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)
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type formatter struct {
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nextTarget ObjectTarget
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key *ecdsa.PrivateKey
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obj *object.RawObject
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sz uint64
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}
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// NewFormatTarget returns ObjectTarget instance that finalizes object structure
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// and writes it to the next target.
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//
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// Chunks must be written before the WriteHeader call.
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//
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// Object changes:
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// - sets version to current SDK version;
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// - sets payload size to the total length of all written chunks;
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// - calculates and sets verification fields (ID, Signature).
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func NewFormatTarget(key *ecdsa.PrivateKey, nextTarget ObjectTarget) ObjectTarget {
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return &formatter{
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nextTarget: nextTarget,
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key: key,
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}
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}
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func (f *formatter) WriteHeader(obj *object.RawObject) error {
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f.obj = obj
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return nil
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}
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func (f *formatter) Write(p []byte) (n int, err error) {
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n, err = f.nextTarget.Write(p)
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f.sz += uint64(n)
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return
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}
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func (f *formatter) Close() (*AccessIdentifiers, error) {
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f.obj.SetVersion(pkg.SDKVersion())
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f.obj.SetPayloadSize(f.sz)
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var parID *objectSDK.ID
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if par := f.obj.GetParent(); par != nil && par.ToV2().GetHeader() != nil {
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rawPar := objectSDK.NewRawFromV2(par.ToV2())
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if err := setIDAndSignature(f.key, rawPar); err != nil {
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return nil, errors.Wrap(err, "could not finalize parent object")
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}
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parID = rawPar.GetID()
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f.obj.SetParent(rawPar.Object())
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}
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if err := setIDAndSignature(f.key, f.obj.SDK()); err != nil {
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return nil, errors.Wrap(err, "could not finalize object")
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}
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if err := f.nextTarget.WriteHeader(f.obj); err != nil {
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return nil, errors.Wrap(err, "could not write header to next target")
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}
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if _, err := f.nextTarget.Close(); err != nil {
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return nil, errors.Wrap(err, "could not close next target")
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}
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return new(AccessIdentifiers).
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WithSelfID(f.obj.GetID()).
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WithParentID(parID), nil
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}
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func setIDAndSignature(key *ecdsa.PrivateKey, obj *objectSDK.RawObject) error {
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if err := objectSDK.CalculateAndSetID(obj); err != nil {
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return errors.Wrap(err, "could not set identifier")
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}
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if err := objectSDK.CalculateAndSetSignature(key, obj); err != nil {
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return errors.Wrap(err, "could not set signature")
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}
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return nil
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}
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