96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
package util
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import (
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"crypto/ecdsa"
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"errors"
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"fmt"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
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apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
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)
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type RequestMessage interface {
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GetMetaHeader() *session.RequestMetaHeader
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}
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// ResponseMessage is an interface of FrostFS response message.
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type ResponseMessage interface {
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GetMetaHeader() *session.ResponseMetaHeader
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SetMetaHeader(*session.ResponseMetaHeader)
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}
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type SignService struct {
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key *ecdsa.PrivateKey
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}
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var ErrAbortStream = errors.New("abort message stream")
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func NewUnarySignService(key *ecdsa.PrivateKey) *SignService {
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return &SignService{
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key: key,
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}
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}
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// SignResponse response with private key via signature.SignServiceMessage.
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// The signature error affects the result depending on the protocol version:
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// - if status return is supported, panics since we cannot return the failed status, because it will not be signed.
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// - otherwise, returns error in order to transport it directly.
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func (s *SignService) SignResponse(statusSupported bool, resp ResponseMessage, err error) error {
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if err != nil {
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if !statusSupported {
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return err
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}
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setStatusV2(resp, err)
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}
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err = signature.SignServiceMessage(s.key, resp)
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if err != nil {
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err = fmt.Errorf("could not sign response: %w", err)
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if statusSupported {
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// We can't pass this error as status code since response will be unsigned.
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// Isn't expected in practice, so panic is ok here.
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panic(err)
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}
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}
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return err
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}
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func (s *SignService) VerifyRequest(req RequestMessage) error {
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if err := signature.VerifyServiceMessage(req); err != nil {
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var sigErr apistatus.SignatureVerification
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sigErr.SetMessage(err.Error())
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return sigErr
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}
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return nil
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}
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// EnsureNonNilResponse creates an appropriate response struct if it is nil.
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func EnsureNonNilResponse[T any](resp *T, err error) (*T, error) {
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if resp != nil {
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return resp, err
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}
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return new(T), err
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}
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// IsStatusSupported returns true iff request version implies expecting status return.
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// This allows us to handle protocol versions <=2.10 (API statuses was introduced in 2.11 only).
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func IsStatusSupported(req RequestMessage) bool {
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version := req.GetMetaHeader().GetVersion()
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mjr := version.GetMajor()
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return mjr > 2 || mjr == 2 && version.GetMinor() >= 11
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}
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func setStatusV2(resp ResponseMessage, err error) {
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// unwrap error
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for e := errors.Unwrap(err); e != nil; e = errors.Unwrap(err) {
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err = e
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}
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session.SetStatus(resp, apistatus.ToStatusV2(apistatus.ErrToStatus(err)))
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}
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