/
prover.go
137 lines (111 loc) · 3.07 KB
/
prover.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
/*
版权所有IBM公司。保留所有权利。
SPDX许可证标识符:Apache-2.0
**/
package client
import (
"context"
"io"
"time"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes"
"github.com/hyperledger/fabric/protos/token"
tk "github.com/hyperledger/fabric/token"
"github.com/pkg/errors"
)
type TimeFunc func() time.Time
type ProverPeer struct {
ChannelID string
ProverClient token.ProverClient
RandomnessReader io.Reader
Time TimeFunc
}
func (prover *ProverPeer) RequestImport(tokensToIssue []*token.TokenToIssue, signingIdentity tk.SigningIdentity) ([]byte, error) {
ir := &token.ImportRequest{
TokensToIssue: tokensToIssue,
}
payload := &token.Command_ImportRequest{ImportRequest: ir}
sc, err := prover.CreateSignedCommand(payload, signingIdentity)
if err != nil {
return nil, err
}
scr, err := prover.ProverClient.ProcessCommand(context.Background(), sc)
if err != nil {
return nil, err
}
return scr.Response, nil
}
func (prover *ProverPeer) RequestTransfer(
tokenIDs [][]byte,
shares []*token.RecipientTransferShare,
signingIdentity tk.SigningIdentity) ([]byte, error) {
tr := &token.TransferRequest{
Shares: shares,
TokenIds: tokenIDs,
}
payload := &token.Command_TransferRequest{TransferRequest: tr}
sc, err := prover.CreateSignedCommand(payload, signingIdentity)
if err != nil {
return nil, err
}
scr, err := prover.ProverClient.ProcessCommand(context.Background(), sc)
if err != nil {
return nil, err
}
return scr.Response, nil
}
func (prover *ProverPeer) CreateSignedCommand(payload interface{}, signingIdentity tk.SigningIdentity) (*token.SignedCommand, error) {
command, err := commandFromPayload(payload)
if err != nil {
return nil, err
}
nonce := make([]byte, 32)
_, err = io.ReadFull(prover.RandomnessReader, nonce)
if err != nil {
return nil, err
}
ts, err := ptypes.TimestampProto(prover.Time())
if err != nil {
return nil, err
}
creator, err := signingIdentity.GetPublicVersion().Serialize()
if err != nil {
return nil, err
}
header := &token.Header{Timestamp: ts,
Nonce: nonce,
Creator: creator,
ChannelId: prover.ChannelID,
}
command.Header = header
raw, err := proto.Marshal(command)
if err != nil {
return nil, err
}
signature, err := signingIdentity.Sign(raw)
if err != nil {
return nil, err
}
sc := &token.SignedCommand{
Command: raw,
Signature: signature,
}
return sc, nil
}
func commandFromPayload(payload interface{}) (*token.Command, error) {
switch t := payload.(type) {
case *token.Command_ImportRequest:
return &token.Command{Payload: t}, nil
case *token.Command_TransferRequest:
return &token.Command{Payload: t}, nil
default:
return nil, errors.Errorf("command type not recognized: %T", t)
}
}