Added gateway-specific Q-Apps handler. For now, just show a warning alert if an app requires authentication / interactive features.

src/main/resources/q-apps/q-apps-gateway.js

@@ -0,0 +1,38 @@
+console.log("Gateway mode");
+
+window.addEventListener("message", (event) => {
+    if (event == null || event.data == null || event.data.length == 0) {
+        return;
+    }
+    if (event.data.action == null || event.data.requestedHandler == null) {
+        return;
+    }
+    if (event.data.requestedHandler != "UI") {
+        // Gateway mode only cares about requests that were intended for the UI
+        return;
+    }
+
+    let response;
+    let data = event.data;
+
+    switch (data.action) {
+        case "GET_USER_ACCOUNT":
+        case "PUBLISH_QDN_RESOURCE":
+        case "SEND_CHAT_MESSAGE":
+        case "JOIN_GROUP":
+        case "DEPLOY_AT":
+        case "GET_WALLET_BALANCE":
+        case "SEND_COIN":
+            const errorString = "Authentication was requested, but this is not yet supported when viewing via a gateway. To use interactive features, please access using the Qortal UI desktop app. More info at: https://qortal.org";
+            alert(errorString);
+            response = "{\"error\": \"" + errorString + "\"}"
+            break;
+
+        default:
+            console.log('Unhandled gateway message: ' + JSON.stringify(data));
+            return;
+    }
+
+    handleResponse(event, response);
+
+}, false);