iOS: alpha node app + setup-code onboarding (#11756)

apps/ios/Sources/Model/NodeAppModel+Canvas.swift

@@ -0,0 +1,97 @@
+import Foundation
+import Network
+import os
+
+extension NodeAppModel {
+    func _test_resolveA2UIHostURL() async -> String? {
+        await self.resolveA2UIHostURL()
+    }
+
+    func resolveA2UIHostURL() async -> String? {
+        guard let raw = await self.gatewaySession.currentCanvasHostUrl() else { return nil }
+        let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !trimmed.isEmpty, let base = URL(string: trimmed) else { return nil }
+        if let host = base.host, Self.isLoopbackHost(host) {
+            return nil
+        }
+        return base.appendingPathComponent("__openclaw__/a2ui/").absoluteString + "?platform=ios"
+    }
+
+    private static func isLoopbackHost(_ host: String) -> Bool {
+        let normalized = host.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+        if normalized.isEmpty { return true }
+        if normalized == "localhost" || normalized == "::1" || normalized == "0.0.0.0" {
+            return true
+        }
+        if normalized == "127.0.0.1" || normalized.hasPrefix("127.") {
+            return true
+        }
+        return false
+    }
+
+    func showA2UIOnConnectIfNeeded() async {
+        guard let a2uiUrl = await self.resolveA2UIHostURL() else {
+            await MainActor.run {
+                self.lastAutoA2uiURL = nil
+                self.screen.showDefaultCanvas()
+            }
+            return
+        }
+        let current = self.screen.urlString.trimmingCharacters(in: .whitespacesAndNewlines)
+        if current.isEmpty || current == self.lastAutoA2uiURL {
+            // Avoid navigating the WKWebView to an unreachable host: it leaves a persistent
+            // "could not connect to the server" overlay even when the gateway is connected.
+            if let url = URL(string: a2uiUrl),
+               await Self.probeTCP(url: url, timeoutSeconds: 2.5)
+            {
+                self.screen.navigate(to: a2uiUrl)
+                self.lastAutoA2uiURL = a2uiUrl
+            } else {
+                self.lastAutoA2uiURL = nil
+                self.screen.showDefaultCanvas()
+            }
+        }
+    }
+
+    func showLocalCanvasOnDisconnect() {
+        self.lastAutoA2uiURL = nil
+        self.screen.showDefaultCanvas()
+    }
+
+    private static func probeTCP(url: URL, timeoutSeconds: Double) async -> Bool {
+        guard let host = url.host, !host.isEmpty else { return false }
+        let portInt = url.port ?? ((url.scheme ?? "").lowercased() == "wss" ? 443 : 80)
+        guard portInt >= 1, portInt <= 65535 else { return false }
+        guard let nwPort = NWEndpoint.Port(rawValue: UInt16(portInt)) else { return false }
+
+        let endpointHost = NWEndpoint.Host(host)
+        let connection = NWConnection(host: endpointHost, port: nwPort, using: .tcp)
+        return await withCheckedContinuation { cont in
+            let queue = DispatchQueue(label: "a2ui.preflight")
+            let finished = OSAllocatedUnfairLock(initialState: false)
+            let finish: @Sendable (Bool) -> Void = { ok in
+                let shouldResume = finished.withLock { flag -> Bool in
+                    if flag { return false }
+                    flag = true
+                    return true
+                }
+                guard shouldResume else { return }
+                connection.cancel()
+                cont.resume(returning: ok)
+            }
+
+            connection.stateUpdateHandler = { state in
+                switch state {
+                case .ready:
+                    finish(true)
+                case .failed, .cancelled:
+                    finish(false)
+                default:
+                    break
+                }
+            }
+            connection.start(queue: queue)
+            queue.asyncAfter(deadline: .now() + timeoutSeconds) { finish(false) }
+        }
+    }
+}