MOB-42 Added backend server, two frontend webpages and rest endpoints for getting challenge, submitting authentication token and getting authentication object. MOB-21 Added JWT creation, but whole process still needs some work.

demoBackend/src/main/resources/static/js/main.js

@@ -0,0 +1,67 @@
+const POLLING_INTERVAL = 1000;
+const POLLING_RETRIES = 120;
+
+function launchAuthApp(action) {
+    if (!isAndroid()) {
+        alert("Functionality only available for Android devices.")
+        return null
+    }
+
+    // Fetch challenge.
+    httpGetAsync(originUrl + challengeUrl, (body) => {
+        let data = JSON.parse(body);
+        let challenge = data.nonce;
+        let intent = createParametrizedIntentUrl(challenge, action); // TODO: Error handling.
+        console.log(intent);
+        window.location.href = intent;
+        pollForAuth(POLLING_INTERVAL, challenge);
+    })
+}
+
+function pollForAuth(timeout, challenge) {
+    console.log("Polling for auth");
+    let requestUrl = originUrl + authenticationRequestUrl + "?challenge=" + challenge;
+
+    let counter = 0;
+    let timer = setInterval(() => {
+        // Fetch authentication object.
+        httpGetAsync(requestUrl, (body) => {
+            console.log(body);
+            // If this is a successful request, stop the polling.
+            clearInterval(timer);
+            window.location.href = originUrl + loggedInUrl;
+        });
+        counter++;
+        if (counter > POLLING_RETRIES) {
+            clearInterval(timer); // Stop polling after some time.
+            let loginErrorAlert = document.getElementById("loginErrorAlert");
+            loginErrorAlert.classList.remove("d-none")
+        }
+    }, timeout)
+
+}
+
+function createParametrizedIntentUrl(challenge, action) {
+    if (action == null) {
+        console.error("There has to be an action for intent.")
+    }
+    return intentUrl + "?" + "action=" + action + (challenge != null ? "&challenge=" + challenge : "");
+}
+
+function isAndroid() {
+    // Check if using Android device.
+    const ua = navigator.userAgent.toLowerCase();
+    return ua.indexOf("android") > -1;
+}
+
+function httpGetAsync(theUrl, callback) {
+    console.log("Sending a request.")
+    const xmlHttp = new XMLHttpRequest();
+    xmlHttp.onreadystatechange = function () {
+        if (xmlHttp.readyState === 4 && xmlHttp.status === 200) {
+            callback(xmlHttp.responseText);
+        }
+    }
+    xmlHttp.open("GET", theUrl, true); // true for asynchronous
+    xmlHttp.send(null);
+}