Passing LWA token to Cognito - ios

Question

I am working a an app which uses the Alexa Voice Service and maintains different users, so the users needs to login with Amazon (LWA). I have implemented it like it is written in the docs and it works flawlessly.
LWA docs: https://developer.amazon.com/de/docs/login-with-amazon/use-sdk-ios.html
AMZNAuthorizationManager.shared().authorize(request, withHandler: {(result : AMZNAuthorizeResult?, userDidCancel : Bool, error : Error?) -> () in
if error != nil {
// Handle errors from the SDK or authorization server.
}
else if userDidCancel {
// Handle errors caused when user cancels login.
}
else {
// Authentication was successful.
// Obtain the access token and user profile data.
self.accessToken = result!.token
self.user = result!.user!
}
})
Furthermore I need to retrieve information from DynamoDB, which uses Cognito for authentification. As stated in the docs, there should be a way pass the access token form LWA to Cognito, but I can't find the proper place to do it. They say LWA provides an AMZNAccessTokenDelegate, which it does not. The delegate method provides an API result which Cognito needs. The link in the Cognito docs below refers to the same exact link from the LWA docs I posted above.
Cognito docs: https://docs.aws.amazon.com/cognito/latest/developerguide/amazon.html
func requestDidSucceed(apiResult: APIResult!) {
if apiResult.api == API.AuthorizeUser {
AIMobileLib.getAccessTokenForScopes(["profile"], withOverrideParams: nil, delegate: self)
} else if apiResult.api == API.GetAccessToken {
credentialsProvider.logins = [AWSCognitoLoginProviderKey.LoginWithAmazon.rawValue: apiResult.result]
}
}
What am I missing?
[EDIT]
I crawled through the LWA sources today until I finally found the correct delegate method.
Use AIAuthenticationDelegate instead of AMZNAccessTokenDelegate
But that lets me sit in front of the next two problems:
I.
Value of type 'AWSCognitoCredentialsProvider' has no member 'logins'
Maybe I have to use the following?
.setValue([AWSCognitoLoginProviderKey.LoginWithAmazon.rawValue: apiResult.result], forKey: "logins")
II.
Use of unresolved identifier 'AWSCognitoLoginProviderKey'
What do I put here? Maybe the API key I got from LWA?
[EDIT2]
I wanted to try it out, but requestDidSucceed never gets called, even through I successfully logged in.

Answer 1

class CustomIdentityProvider: NSObject, AWSIdentityProviderManager {
func logins() -> AWSTask<NSDictionary> {
return AWSTask(result: loginTokens)
}
var loginTokens : NSDictionary
init(tokens: [String : String]) {
self.loginTokens = tokens as NSDictionary
}
}
in the Authorization code at this below in successsful
AMZNAuthorizationManager.shared().authorize(request) { (result, userDidCancel, error) in
if ((error) != nil) {
// Handle errors from the SDK or authorization server.
} else if (userDidCancel) {
// Handle errors caused when user cancels login.
} else {
let logins = [IdentityProvider.amazon.rawValue: result!.token]
let customProviderManager = CustomIdentityProvider(tokens: logins)
guard let apiGatewayEndpoint = AWSEndpoint(url: URL(string: "APIGATEWAYURL")) else {
fatalError("Error creating API Gateway endpoint url")
}
let credentialsProvider = AWSCognitoCredentialsProvider(regionType: .USWest2, identityPoolId: "IDENTITY_ID", identityProviderManager:customProviderManager)
let configuration = AWSServiceConfiguration(region: .USWest2, endpoint: apiGatewayEndpoint, credentialsProvider: credentialsProvider)
}