OAuth Redirect Listener

OAuth Redirect Listener.kt

// Set Redirect Listener
webView.webViewClient = object : WebViewClient() {
    override fun shouldOverrideUrlLoading(view: WebView?, request: WebResourceRequest?): Boolean {
        request?.let {
            // Check if this url is our OAuth redirectUrl, otherwise ignore it
            if (request.url.toString().startsWith(redirectUri)) {
                // To prevent CSRF attacks, check that we got the same state value we sent, otherwise ignore it
                val responseState = request.url.getQueryParameter("state")
                if (responseState == uniqueState) {
                    // This is our request. Parse the redirect URL query parameters to get the code
                    request.url.getQueryParameter("code")?.let { code ->
                        // Got it!
                        Log.d("OAuth", "Here is the authorization code! $code")
                        // TODO: Use authorization code to continue with API flow
                    } ?: run {
                        // User cancelled the login flow
                        Log.d("OAuth", "Authorization code not received :(")
                        // TODO: Handle error
                    }
                }
            }
        }
        return super.shouldOverrideUrlLoading(view, request)
    }
}