AWS cognito login set AuthFlow to USER_PASSWORD_AUTH in iOS

Question

I’m using AWS Cognito to perform login authentication. When login is successful we get below request body :

Request body:

> {"UserContextData":{"EncodedData":"eyJ..9”},”ClientMetadata":{"cognito:deviceName":"MacBookPro12-01","cognito:bundleShortV":"1.0.0",
> "cognito:idForVendor":"A6FD46FBB205","cognito:bundleVersion":"207",
>     "cognito:bundleId":"com.abc.Project-Dev","cognito:model":"iPhone", "cognito:systemName":"iOS","cognito:iOSVersion":"11.3"},
>     "AuthParameters":{"SRP_A":"a6..627","SECRET_HASH":"vr..Oo=", "USERNAME":"[email protected]”},**”AuthFlow":"USER_SRP_AUTH"**,
> "ClientId”:”123”}

Now, there is a scenario wherein I’ve to set “AuthFlow” value to “USER_PASSWORD_AUTH”. How can this be done?

The headache with this is that all these values are set in Pods. Below code prints the request body that is added above :

passwordAuthenticationCompletion?.set(result: AWSCognitoIdentityPasswordAuthenticationDetails(username: username, password: password))

Answer 1

If you will look into AWSCognitoIdentityUser in method getSessionWithUserName andPassword you will see that there is a ternary operator switching migration auth that is driven by migrationEnabled Boolean value. In order to switch auth type just configure identity pool like so:

  let userPoolConfiguration = AWSCognitoIdentityUserPoolConfiguration (
        clientId: clientId,
        clientSecret: nil,
        poolId: userPoolId,
        shouldProvideCognitoValidationData: false,
        pinpointAppId: nil,
        migrationEnabled: true
    )

Answer 2

I found you need to enable the migration in your amplifyconfigurqaton.json so that it uses the USER_PASSWORD_AUTH mode (it will ignore it otherwise):

{
    "auth": {
        "plugins": {
            "awsCognitoAuthPlugin": {
                "IdentityManager": {
                    "Default": {}
                },
                "CredentialsProvider": {
                    "CognitoIdentity": {
                        "Default": {
                            "PoolId": "xxxx",
                            "Region": "xxxxx"
                        }
                    }
                },
                "CognitoUserPool": {
                    "Default": {
                        "PoolId": "xxxxx",
                        "AppClientId": "xxxxx",
                        "Region": "xxxxx",
                        "MigrationEnabled" : true
                    }