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enroll.go
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enroll.go
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package hlfsdk
import (
"encoding/base64"
"encoding/json"
"fmt"
"github.com/hyperledger/fabric-sdk-go/pkg/client/msp"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config"
"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
"os"
)
func Enroll(user string, secret string, connectionProfilePath string) (string, error) {
var payload string
var error error
if _, err := os.Stat(connectionProfilePath); os.IsNotExist(err) {
error = fmt.Errorf("file does not exist %v", err);
} else {
c := config.FromFile(connectionProfilePath)
// Create a fabric sdk client
sdk, err := fabsdk.New(c)
if err != nil { // If the sdk conection with the fabric network was not successful
error = fmt.Errorf("could not create sdk: %v", err)
sdk.Close()
} else {
defer sdk.Close() // We defer the closing of the connection to later
// If the sdk was created successfully
ctx := sdk.Context()
mspClient, err := msp.New(ctx) // Create a content so that we can interact with the blockchain
if err != nil { // Not Successful
error = fmt.Errorf("could not create msp client: %v", err)
} else { // Successful
identity, err := mspClient.GetSigningIdentity(user) //We load the identity from local store
if err == msp.ErrUserNotFound { // If the identity is not present in the local store
err = mspClient.Enroll(user, msp.WithSecret(secret)) // We enroll and store the identity locally
if err != nil {
//If we could not successfully enroll the user
error = fmt.Errorf("failed to enroll user. either the user is already enrolled. local msp not found or connection profile setting issues: %v", err)
} else { // We enrolled the user successfully
identity, err = mspClient.GetSigningIdentity(user) // We load the identity from local store
if err != nil {
error = fmt.Errorf("GetSigningIdentity failed: %v", err) // We couldnt load the identity that was enrolled
}
}
} else {
// The user is already enrolled and we found its MP locally.
// That's why we dont override the global error variable
fmt.Errorf("user already enrolled. local msp found! %v", err)
}
// If we dont have anny errors
if error == nil {
// Load the required info from the identity and store them into the Wallet object
cert := base64.StdEncoding.EncodeToString(identity.PublicVersion().EnrollmentCertificate())
privKeyName := fmt.Sprintf("%x_sk", identity.PrivateKey().SKI())
id := identity.Identifier()
certName := fmt.Sprintf("%s@%s-cert.pem", id.ID, id.MSPID)
output, err := json.Marshal(&Wallet{cert, certName, privKeyName})
if err != nil {
error = fmt.Errorf("GetSigningIdentity failed: %v", err)
}
payload = string(output)
}
}
}
}
return payload, error
}