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main.go
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main.go
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package main
import (
"bufio"
crand "crypto/rand"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/CosmWasm/wasmd/x/verifiable-credential/crypto/accumulator"
"github.com/CosmWasm/wasmd/x/verifiable-credential/crypto/anonymouscredential"
log "github.com/sirupsen/logrus"
"github.com/kitounliu/ac-agent/client"
vctypes "github.com/CosmWasm/wasmd/x/verifiable-credential/types"
)
const SchemaFilePath = "data/schema"
func Run(cc *client.ChainClient) {
loop:
for {
log.Println("\nChoose option:\n" +
"1: Check account balance\n" +
"2: Create anonymous credential schema (issuer only)\n" +
"3: Request credential from issuer\n" +
"4: Issue credentials and update schema on chain (issuer only)\n" +
"5: Load credential and schema\n" +
"6: Load schema\n" +
"7: Request proof\n" +
"8: Create proof\n" +
"9: Verify proof\n" +
"10: Revoke users and update schema on chain (issuer only)\n" +
"11: Update credential and schema\n" +
"q: Quit\n")
reader := bufio.NewReader(os.Stdin)
// ReadString will block until the delimiter is entered
input, err := reader.ReadString('\n')
if err != nil {
log.Println("An error occurred while reading input. Please try again", err)
return
}
// remove the delimeter from the string
i := strings.TrimSuffix(input, "\n")
switch i {
case "1":
_, err := cc.GetBalances(cc.Acc.String())
if err != nil {
log.Fatalln("An error occurred while querying balance. Please try again", err)
return
}
case "2":
if cc.Name != "issuer" {
log.Println("Only issuer can create schema")
break
}
err := cc.NewAnonymousCredentialSchema(4)
if err != nil {
log.Fatalln("error creating new ac schema", err)
}
res, err := cc.GetVerifiableCredential(cc.SchemaId)
if err != nil {
log.Fatalln("error querying anonymous credential schema", err)
}
data, err := cc.Ctx.Codec.MarshalJSON(res)
if err != nil {
log.Fatalln("error marshalling anonymous credential schema", err)
}
log.Infoln("schema query result:", string(data))
case "3":
if cc.Name == "issuer" {
log.Println("error issuer cannot request credential")
break
}
log.Printf("Enter %s's address:\n", cc.Name)
reader := bufio.NewReader(os.Stdin)
// ReadString will block until the delimiter is entered
input, err := reader.ReadString('\n')
if err != nil {
log.Fatalln("An error occurred while reading address. Please try again", err)
return
}
// remove the delimeter from the string
address := strings.TrimSuffix(input, "\n")
log.Printf("Enter %s's date of birth:\n", cc.Name)
var dob int
_, err = fmt.Scanf("%d", &dob)
if err != nil {
log.Fatalln("An error occurred while reading date-of-birth. Please try again", err)
return
}
userInfo := client.Info{
Name: cc.Name,
Address: address,
DateOfBirth: dob,
}
data, err := json.Marshal(userInfo)
if err != nil {
log.Fatalln("cannot json marshal user information", err)
}
log.Printf("Sending information to issuer: %s\n", string(data))
requestFilePath := client.DataPath + "/" + cc.Name + ".info"
err = client.WriteData(requestFilePath, data)
if err != nil {
log.Fatalln("Cannot send user information to issuer", err)
}
case "4":
if cc.Name != "issuer" {
log.Println("Only issuer can issue credential")
break
}
// users to be added
log.Print("Enter names of users to be added:")
reader := bufio.NewReader(os.Stdin)
// ReadString will block until the delimiter is entered
input, err := reader.ReadString('\n')
if err != nil {
log.Fatalln("An error occurred while reading users. Please try again", err)
return
}
names := strings.Split(input, " ")
for i := range names {
names[i] = strings.TrimSpace(names[i])
}
err = cc.IssueCredentials(names)
if err != nil {
log.Fatalln("failed to issue credential", err)
}
log.Infoln("user private credentials created")
// query schema
res, err := cc.GetVerifiableCredential(cc.SchemaId)
if err != nil {
log.Fatalln("error querying anonymous credential schema", err)
}
data, err := cc.Ctx.Codec.MarshalJSON(res)
if err != nil {
log.Fatalln("error marshalling anonymous credential schema", err)
}
log.Infoln("updated schema:", string(data))
case "5":
if cc.Name == "issuer" {
log.Println("Not for issuer")
break
}
credPath := client.KeyPath + "/" + cc.Name + ".cred"
cred, err := ioutil.ReadFile(credPath)
if err != nil {
log.Fatalln("error reading credential")
}
log.Println("private credential for ", cc.Name)
log.Println(string(cred))
err = json.Unmarshal(cred, &cc.UserCred)
if err != nil {
log.Fatalln("error storing credential")
}
cc.SchemaId = cc.UserCred.SchemaId
res, err := cc.GetVerifiableCredential(cc.SchemaId)
if err != nil {
log.Fatalln("error querying anonymous credential schema", err)
}
vc := res.VerifiableCredential
err = cc.VerifySchemaWithDid(vc)
if err != nil {
log.Infoln("failed to verify schema. Please try another one", err)
break
}
vcSub, ok := res.VerifiableCredential.CredentialSubject.(*vctypes.VerifiableCredential_AnonCredSchema)
if !ok {
log.Fatalln("error getting vc subject", err)
}
cc.IssuerPp = vcSub.AnonCredSchema.PublicParams
data, err := cc.Ctx.Codec.MarshalJSON(res)
if err != nil {
log.Fatalln("error marshalling anonymous credential schema", err)
}
log.Infoln("schema: ", string(data))
case "6":
log.Println("Enter schema id:\n")
reader := bufio.NewReader(os.Stdin)
// ReadString will block until the delimiter is entered
input, err := reader.ReadString('\n')
if err != nil {
log.Fatalln("An error occurred while reading schema id. Please try again", err)
return
}
// remove the delimeter from the string
schemaId := strings.TrimSuffix(input, "\n")
res, err := cc.GetVerifiableCredential(schemaId)
if err != nil {
log.Fatalln("error querying anonymous credential schema", err)
}
vc := res.VerifiableCredential
err = cc.VerifySchemaWithDid(vc)
if err != nil {
log.Infoln("failed to verify schema. Please try another one", err)
break
}
vcSub, ok := res.VerifiableCredential.CredentialSubject.(*vctypes.VerifiableCredential_AnonCredSchema)
if !ok {
log.Fatalln("error getting vc subject", err)
}
cc.SchemaId = schemaId
cc.IssuerPp = vcSub.AnonCredSchema.PublicParams
log.Infoln("schema loaded successfully")
case "7":
var nonce [32]byte
_, err := crand.Read(nonce[:])
if err != nil {
log.Fatalln("error creating random nonce", err)
}
req := client.Request{
Nonce: nonce[:],
RevealName: true,
}
data, err := json.Marshal(req)
if err != nil {
log.Fatalln("error marshalling proof request", err)
}
log.Println("proof request:\n", string(data))
filePath := client.DataPath + "/proof.request"
err = client.WriteData(filePath, data)
if err != nil {
log.Fatalln("error sending request", err)
}
case "8":
// load info
filePath := client.DataPath + "/" + cc.Name + ".info"
data, err := ioutil.ReadFile(filePath)
if err != nil {
log.Fatalln("error receiving info", err)
}
info := client.Info{}
err = json.Unmarshal(data, &info)
if err != nil {
log.Fatalln("error unmarshalling info", err)
}
// load request
filePath = client.DataPath + "/proof.request"
data, err = ioutil.ReadFile(filePath)
if err != nil {
log.Fatalln("error receiving proof request", err)
}
req := client.Request{}
err = json.Unmarshal(data, &req)
if err != nil {
log.Fatalln("error unmarshalling proof request", err)
}
// create proof
revealedInfo, proof, err := client.CreateProof(info, req, cc.UserCred, cc.IssuerPp)
if err != nil {
log.Fatalln("error creating proof", err)
}
proofBytes, err := cc.Ctx.Codec.MarshalJSON(proof)
if err != nil {
log.Fatalln("error marshalling proof", err)
}
finalProof := client.Proof{
RevealedInfo: revealedInfo,
Proof: proofBytes,
}
finalProofBytes, err := json.Marshal(finalProof)
if err != nil {
log.Fatalln("error marshalling final proof", err)
}
log.Infoln("sending proof:\n", string(finalProofBytes))
proofPath := client.DataPath + "/proof"
err = client.WriteData(proofPath, finalProofBytes)
if err != nil {
log.Fatalln("error sending proof", err)
}
case "9":
// load proof
proofPath := client.DataPath + "/proof"
data, err := ioutil.ReadFile(proofPath)
if err != nil {
log.Fatalln("error loading proof", err)
}
finalProof := client.Proof{}
err = json.Unmarshal(data, &finalProof)
if err != nil {
log.Fatalln("error unmarshalling final proof", err)
}
proof := anonymouscredential.AnonymousCredentialProof{}
err = cc.Ctx.Codec.UnmarshalJSON(finalProof.Proof, &proof)
if err != nil {
log.Fatalln("error unmarshalling proof", err)
}
// load request
requestPath := client.DataPath + "/proof.request"
data, err = ioutil.ReadFile(requestPath)
if err != nil {
log.Fatalln("error receiving proof request", err)
}
req := client.Request{}
err = json.Unmarshal(data, &req)
if err != nil {
log.Fatalln("error unmarshalling proof request", err)
}
err = client.VerifyProof(finalProof.RevealedInfo, req, &proof, cc.IssuerPp)
if err != nil {
log.Info("error verify proof: ", err.Error())
} else {
log.Info("proof verified successfully")
}
case "10":
if cc.Name != "issuer" {
log.Println("Only issuer can revoke credential")
break
}
log.Print("Enter names of users to be revoked:")
reader := bufio.NewReader(os.Stdin)
// ReadString will block until the delimiter is entered
input, err := reader.ReadString('\n')
if err != nil {
log.Fatalln("An error occurred while reading address. Please try again", err)
return
}
names := strings.Split(input, " ")
for i := range names {
names[i] = strings.TrimSpace(names[i])
}
err = cc.RevokeCredentials(names)
if err != nil {
log.Fatalln("An error occurred while revoking users. Please try again", err)
return
}
// query schema
res, err := cc.GetVerifiableCredential(cc.SchemaId)
if err != nil {
log.Fatalln("error querying anonymous credential schema", err)
}
data, err := cc.Ctx.Codec.MarshalJSON(res)
if err != nil {
log.Fatalln("error marshalling anonymous credential schema", err)
}
log.Infoln("updated schema:", string(data))
log.Infoln("successfully revoked users")
case "11":
if cc.Name == "issuer" {
log.Println("Not for issuer")
break
}
if cc.SchemaId == "" {
log.Println("schema id not set")
break
}
// query new schema
res, err := cc.GetVerifiableCredential(cc.SchemaId)
if err != nil {
log.Fatalln("error querying anonymous credential schema", err)
}
vcSub, ok := res.VerifiableCredential.CredentialSubject.(*vctypes.VerifiableCredential_AnonCredSchema)
if !ok {
log.Fatalln("error getting vc subject", err)
}
oldPP := cc.IssuerPp
pp := vcSub.AnonCredSchema.PublicParams
// print schema
data, err := cc.Ctx.Codec.MarshalJSON(res)
if err != nil {
log.Fatalln("error marshalling anonymous credential schema", err)
}
log.Infoln("updated schema:", string(data))
err = client.IsNotRevoked(cc.UserCred.MemberIdSeed, oldPP, pp)
if err != nil {
log.Infof("%s is reovked and cannot update witness", cc.Name)
cc.IssuerPp = pp
log.Infoln("updated schema")
break
}
newWit, err := accumulator.UpdateWitness(oldPP.AccumulatorPublicParams, pp.AccumulatorPublicParams, cc.UserCred.MemberWitness)
if err != nil {
log.Fatalln("failed to update private credential (mebership witness):", err.Error())
}
cc.UserCred.MemberWitness = newWit
cc.IssuerPp = pp
log.Infoln("successfully updated witness and schema")
case "q":
fmt.Println("Exit program")
break loop
default:
fmt.Println("No such option")
}
}
}
func main() {
fmt.Print("Enter new user name: ")
reader := bufio.NewReader(os.Stdin)
// ReadString will block until the delimiter is entered
name, _ := reader.ReadString('\n')
name = strings.TrimSpace(name)
password := "insecure password for " + name
clientCtx := client.InitClient(name, password)
Run(clientCtx)
}