Basic authentication flow

js/authenticate.js

@@ -0,0 +1,25 @@
+function authenticate(){
+    const selectedUser = users[currentUser].id;
+
+    lightdm.cancel_authentication();
+    lightdm.authenticate(selectedUser);
+}
+
+async function authenticationComplete() {
+    const selectedSession = sessions[currentSession].id;
+    
+    await lightdm.respond($("#password-input").value);
+    lightdm.start_session(selectedSession);
+}
+
+function bindAuthenticate() {
+    $("#password-input").onkeypress = function(e) {
+	var keycode = e.code || e.key;
+	if(keycode == "Enter"){
+	    authenticate();
+	    return;
+	}
+    }
+
+    window.lightdm.authentication_complete.connect(authenticationComplete);
+}