AWS Cognito Unable to verify secret hash for client

Question

When I try to authenticateUser I get

Error: Unable to verify secret hash for client <CLIENT_ID_HERE>

Whats wrong? My code below:

import {
  Config,
  CognitoIdentityCredentials
} from "aws-sdk"
import {
  CognitoUserPool,
  CognitoUserAttribute,
  AuthenticationDetails,
  CognitoUser
} from "amazon-cognito-identity-js"

Config.region = "ap-northeast-2"

var userpool = new CognitoUserPool({
  UserPoolId: "ap-northeast-2_QosOiWMkd",
  ClientId: "1bd6s9mv98bo2lucen2vesbqls"
})

var userData = {
  Username: "[email protected]",
  Pool: userpool
}

var authData = new AuthenticationDetails({
  Username: "[email protected]",
  Password: "P@$$w0rd"
})

var cognitoUser = new CognitoUser(userData)
cognitoUser.authenticateUser(authData, {
  onSuccess: function (result) {
    console.log("authenticated with", result)
  },
  onFailure: function (err) {
    console.error(err)
  }
})

On AWS, Client secret is already disabled

Answer 1

The Amazon Cognito Identity SDK for JavaScript does not support Apps with client secret. This is stated in the SDK documentation:

When creating the App, the generate client secret box must be unchecked because the JavaScript SDK doesn't support apps that have a client secret.

It looks like you are going to have to re-configure your app.

Answer 2

The solution is to pass secret_hash along with the adminAuthInitiate Request. And to calculate the secret hash you can use the following method:

public static String calculateSecretHash(String userPoolClientId, String userPoolClientSecret, String userName) {
final String HMAC_SHA256_ALGORITHM = "HmacSHA256";
        SecretKeySpec signingKey = new SecretKeySpec(
                userPoolClientSecret.getBytes(StandardCharsets.UTF_8),
                HMAC_SHA256_ALGORITHM);
        try {
            Mac mac = Mac.getInstance(HMAC_SHA256_ALGORITHM);
            mac.init(signingKey);
            mac.update(userName.getBytes(StandardCharsets.UTF_8));
            byte[] rawHmac = mac.doFinal(userPoolClientId.getBytes(StandardCharsets.UTF_8));
            return Base64.getEncoder().encodeToString(rawHmac);
        } catch (Exception e) {
            throw new RuntimeException("Error while calculating ");
        }
    }

How to Pass Secret_Hash

Map<String, String> authParams = new HashMap<>(2);
authParams.put("USERNAME", <username>);
authParams.put("PASSWORD", <password>);
                    authParams.put("SECRET_HASH", calculateSecretHash(cognitoClientId, cognitoClientSecret, <username>));
                    AdminInitiateAuthRequest authRequest = new AdminInitiateAuthRequest()
                            .withClientId(userPool.getClientId()).withUserPoolId(userPool.getUserPoolId())
                            .withAuthFlow(AuthFlowType.ADMIN_NO_SRP_AUTH).withAuthParameters(authParams);
                    AdminInitiateAuthResult result = cognito.adminInitiateAuth(authRequest);
                    auth = result.getAuthenticationResult();