AWSIdentityRepository.kt

    override fun initiateTOTPSignup(handler: IdentityHandler) {
        userPool.currentUser.associateSoftwareTokenInBackground(null, object : RegisterMfaHandler {
            override fun onSuccess(sessionToken: String?) {
                val mfaSettings = listOf(
                        CognitoMfaSettings(CognitoMfaSettings.SMS_MFA).apply {
                            isEnabled = true
                            isPreferred = false
                        },
                        CognitoMfaSettings(CognitoMfaSettings.TOTP_MFA).apply {
                            isEnabled = true
                            isPreferred = true
                        }
                )
                userPool.currentUser.setUserMfaSettingsInBackground(mfaSettings, object : GenericHandler {
                    override fun onSuccess() = runOnUiThread { handler(IdentityRequest.SUCCESS, null) { /* Do Nothing */ } }
                    override fun onFailure(exception: Exception?) = handleFailure(handler, exception?.message)
                })
            }

            override fun onFailure(exception: java.lang.Exception?) = handleFailure(handler, exception?.message)

            override fun onVerify(continuation: VerifyMfaContinuation?) {
                runOnUiThread {
                    handler(IdentityRequest.NEED_MULTIFACTORCODE, continuation?.parameters) { response -> run {
                        with (continuation!!) {
                            thread(start = true) {
                                setVerificationResponse(response?.get("mfaCode"), "Android App")
                                continueTask()
                            }
                        }
                    }}
                }
            }
        })
    }