131 lines
3.3 KiB
Go
131 lines
3.3 KiB
Go
package util
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import (
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"context"
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"crypto/ecdsa"
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"fmt"
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"github.com/nspcc-dev/neofs-api-go/v2/session"
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"github.com/nspcc-dev/neofs-api-go/v2/signature"
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)
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// ResponseMessage is an interface of NeoFS 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 UnaryHandler func(context.Context, interface{}) (ResponseMessage, error)
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type SignService struct {
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key *ecdsa.PrivateKey
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}
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type ResponseMessageWriter func(ResponseMessage) error
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type ServerStreamHandler func(context.Context, interface{}) (ResponseMessageReader, error)
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type ResponseMessageReader func() (ResponseMessage, error)
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type ResponseMessageStreamer struct {
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key *ecdsa.PrivateKey
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recv ResponseMessageReader
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}
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type RequestMessageWriter func(interface{}) error
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type ClientStreamCloser func() (ResponseMessage, error)
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type RequestMessageStreamer struct {
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key *ecdsa.PrivateKey
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send RequestMessageWriter
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close ClientStreamCloser
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}
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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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func (s *RequestMessageStreamer) Send(req interface{}) error {
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// verify request signatures
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if err := signature.VerifyServiceMessage(req); err != nil {
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return fmt.Errorf("could not verify request: %w", err)
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}
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return s.send(req)
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}
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func (s *RequestMessageStreamer) CloseAndRecv() (ResponseMessage, error) {
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resp, err := s.close()
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if err != nil {
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return nil, fmt.Errorf("could not close stream and receive response: %w", err)
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}
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if err := signature.SignServiceMessage(s.key, resp); err != nil {
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return nil, fmt.Errorf("could not sign response: %w", err)
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}
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return resp, nil
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}
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func (s *SignService) CreateRequestStreamer(sender RequestMessageWriter, closer ClientStreamCloser) *RequestMessageStreamer {
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return &RequestMessageStreamer{
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key: s.key,
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send: sender,
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close: closer,
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}
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}
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func (s *ResponseMessageStreamer) Recv() (ResponseMessage, error) {
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m, err := s.recv()
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if err != nil {
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return nil, fmt.Errorf("could not receive response message for signing: %w", err)
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}
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if err := signature.SignServiceMessage(s.key, m); err != nil {
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return nil, fmt.Errorf("could not sign response message: %w", err)
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}
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return m, nil
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}
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func (s *SignService) HandleServerStreamRequest(req interface{}, respWriter ResponseMessageWriter) (ResponseMessageWriter, error) {
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// verify request signatures
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if err := signature.VerifyServiceMessage(req); err != nil {
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return nil, fmt.Errorf("could not verify request: %w", err)
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}
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return func(resp ResponseMessage) error {
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if err := signature.SignServiceMessage(s.key, resp); err != nil {
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return fmt.Errorf("could not sign response message: %w", err)
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}
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return respWriter(resp)
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}, nil
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}
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func (s *SignService) HandleUnaryRequest(ctx context.Context, req interface{}, handler UnaryHandler) (ResponseMessage, error) {
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// verify request signatures
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if err := signature.VerifyServiceMessage(req); err != nil {
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return nil, fmt.Errorf("could not verify request: %w", err)
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}
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// process request
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resp, err := handler(ctx, req)
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if err != nil {
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return nil, fmt.Errorf("could not handle request: %w", err)
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}
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// sign the response
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if err := signature.SignServiceMessage(s.key, resp); err != nil {
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return nil, fmt.Errorf("could not sign response: %w", err)
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}
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return resp, nil
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}
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