MasterCard Gateway Android SDK 3DS Secure Auth in Kotlin

Gateway3DSecureActivity.kt

public class GatewaySecureActivity : AppCompatActivity() {

   companion object{
       /**
        * The HTML used to initialize the WebView. Should be the HTML content returned from the Gateway
        * during the Check 3DS Enrollment call
        */
       val EXTRA_HTML = "com.mastercard.gateway.android.HTML"

       /**
        * An OPTIONAL title to display in the toolbar for this activity
        */
       val EXTRA_TITLE = "com.mastercard.gateway.android.TITLE"

       /**
        * The ACS Result data after performing 3DS
        */
       val EXTRA_ACS_RESULT = "com.mastercard.gateway.android.ACS_RESULT"


       val REDIRECT_SCHEME = "gatewaysdk"

   }
    lateinit var toolbar: Toolbar
    lateinit var webView: WebView


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_gateway_secure)

        // init toolbar
        toolbar = findViewById(R.id.toolbar)
        toolbar.setNavigationOnClickListener { view -> onBackPressed() }

        // init web view

        // init web view
        webView = findViewById(R.id.webview)
        webView.webChromeClient = WebChromeClient()
        webView.settings.domStorageEnabled = true
        webView.settings.javaScriptEnabled = true
        webView.webViewClient = buildWebViewClient()

        init()
    }
    fun init() {
        // init html
        val extraHtml: String? = getExtraHtml()
        if (extraHtml == null) {
            onBackPressed()
            return
        } else {
            setWebViewHtml(extraHtml)
        }

        // init title
//        val defaultTitle: String = getDefaultTitle()
//        val extraTitle: String = getExtraTitle()
//        setToolbarTitle(extraTitle ?: defaultTitle)
    }
    fun getDefaultTitle(): String? {
        return getString(com.mastercard.gateway.android.sdk.R.string.gateway_3d_secure_authentication)
    }
    fun getExtraTitle(): String? {
        val extras = intent.extras
        return extras?.getString(GatewaySecureActivity.EXTRA_TITLE)
    }
    fun getExtraHtml(): String? {
        val extras = intent.extras
        return extras?.getString(GatewaySecureActivity.EXTRA_HTML)
    }
    fun setToolbarTitle(title: String?) {
        toolbar.title = title
    }
    fun setWebViewHtml(html: String?) {
        webview.webViewClient = object : WebViewClient(){
            override fun onReceivedError(
                view: WebView?,
                request: WebResourceRequest?,
                error: WebResourceError?
            ) {
                Log.e("WEBVIEW ERR",error.toString())
                super.onReceivedError(view, request, error)
            }
        }
        webView.loadDataWithBaseURL(null,html, "text/html", "utf-8",null)
    }
    fun webViewUrlChanges(uri: Uri) {
        val scheme = uri.scheme
        if (REDIRECT_SCHEME.equals(scheme, ignoreCase = true)) {
            complete(getACSResultFromUri(uri))
        } else if ("mailto".equals(scheme, ignoreCase = true)) {
            intentToEmail(uri)
        } else {
            loadWebViewUrl(uri)
        }
    }
    fun complete(acsResult: String?) {
        val intent = Intent()
        complete(acsResult, intent)
    }
    fun complete(acsResult: String?, intent: Intent) {
        intent.putExtra(GatewaySecureActivity.EXTRA_ACS_RESULT, acsResult)
        setResult(Activity.RESULT_OK, intent)
        finish()
    }

    fun loadWebViewUrl(uri: Uri) {
        webView.loadUrl(uri.toString())
    }

    fun intentToEmail(uri: Uri?) {
        val emailIntent = Intent(Intent.ACTION_SENDTO)
        intentToEmail(uri, emailIntent)
    }

    // separate for testability
    fun intentToEmail(uri: Uri?, intent: Intent) {
        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
        intent.data = uri
        startActivity(intent)
    }

    fun getACSResultFromUri(uri: Uri): String? {
        var result: String? = null
        val params = uri.queryParameterNames
        for (param in params) {
            if ("acsResult".equals(param, ignoreCase = true)) {
                result = uri.getQueryParameter(param)
            }
        }
        return result
    }

    fun buildWebViewClient(): WebViewClient? {
        return object : WebViewClient() {
            override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
                webViewUrlChanges(Uri.parse(url))
                return true
            }
        }
    }
}