Show IP from JSON

src/app.tsx

@@ -1,22 +1,28 @@
 import React from 'react';
+
+import { TailscaleBackendState, TailscaleStatusResponse, TailscaleUpResponse } from './types';
 import { Card, CardTitle, CardBody } from '@patternfly/react-core';
 
 type ApplicationProps = { 
 }
 
 type ApplicationState = { 
-    response: string
+    Status: TailscaleStatusResponse
 }
 
+
+
 export class Application extends React.Component<ApplicationProps, ApplicationState> {
     state: ApplicationState = {
-        response: ""
+        Status: null
     }
+
     constructor(props: ApplicationProps) {
 	super(props);
 
-        cockpit.spawn(['tailscale', 'status']).done(content => {
+        cockpit.spawn(['tailscale', 'status', '--json']).done(content => {
-		this.setState(state => ({response: content.trim()}));        
+            const status: TailscaleStatusResponse = JSON.parse(content)
+		    this.setState(state => ({Status: status}));        
         });
     }
 
@@ -26,7 +32,11 @@ export class Application extends React.Component<ApplicationProps, ApplicationSt
             <CardTitle>Tailscale</CardTitle>
             <CardBody>
                 <pre>
-		        { this.state.response }
+                {
+                    this.state.Status != null
+                        ? this.state.Status.Self.TailscaleIPs[0]
+                        : <p>Loading...</p>
+                }
                 </pre>
             </CardBody>
 		</Card>

src/types.ts

@@ -0,0 +1,45 @@
+// BackendState
+// Keep in sync with https://github.com/tailscale/tailscale/blob/main/ipn/backend.go
+export type TailscaleBackendState =
+  | 'NoState'
+  | 'NeedsMachineAuth'
+  | 'NeedsLogin'
+  | 'InUseOtherUser'
+  | 'Stopped'
+  | 'Starting'
+  | 'Running';
+
+export type TailscaleStatusResponse = {
+  BackendState: TailscaleBackendState;
+  AuthURL: string;
+  Self: {
+    ID: string;
+    UserID: number;
+    HostName: string;
+    DNSName: string;
+    OS: string;
+    TailscaleIPs: string[];
+    Capabilities: string[];
+    Online: boolean
+  };
+  User: Record<string, TailscaleUser> | null;
+  CurrentTailnet: {
+    Name: string;
+    MagicDNSSuffix: string;
+    MagicDNSEnabled: boolean;
+  } | null;
+};
+
+export type TailscaleUser = {
+  ID: number;
+  LoginName: string;
+  DisplayName: string;
+  ProfilePicURL: string;
+  Roles: string[];
+};
+
+export type TailscaleUpResponse = {
+  BackendState: TailscaleBackendState;
+  AuthURL?: string; // e.g. https://login.tailscale.com/a/0123456789abcdef
+  QR?: string; // a DataURL-encoded QR code PNG of the AuthURL
+};