✨ Auth guard

lib/auth.dart

@@ -1,121 +1,106 @@
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
-import 'package:webview_flutter/webview_flutter.dart';
+import 'package:goatagent/screens/auth.dart';
 import 'package:oauth2/oauth2.dart' as oauth2;
 
-class LoginPage extends StatelessWidget {
-  const LoginPage({super.key});
+class AuthGuard {
+  static final AuthGuard _singleton = AuthGuard._internal();
 
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Goatworks Login'),
-      ),
-      body: Center(
-        child: ElevatedButton(
-          onPressed: () async {
-            await _login(context);
-          },
-          child: const Text('Login with Goatpass'),
-        ),
-      ),
-    );
+  final authorizationEndpoint =
+      Uri.parse('https://id.smartsheep.studio/auth/o/connect');
+  final tokenEndpoint =
+      Uri.parse('https://id.smartsheep.studio/api/auth/token');
+  final userinfoEndpoint =
+      Uri.parse('https://id.smartsheep.studio/api/users/me');
+  final redirectUrl = Uri.parse('goatagent://auth');
+
+  static const clientId = "goatagent";
+  static const clientSecret = "_F4%q2Eea3";
+
+  static const storage = FlutterSecureStorage();
+  static const storageKey = "identity";
+  static const profileKey = "profiles";
+
+  factory AuthGuard() {
+    return _singleton;
   }
 
-  Future<void> _login(BuildContext context) async {
-    final authorizationEndpoint =
-        Uri.parse('https://id.smartsheep.studio/auth/o/connect');
-    final tokenEndpoint =
-        Uri.parse('https://id.smartsheep.studio/api/auth/token');
-    final userinfoEndpoint =
-        Uri.parse('https://id.smartsheep.studio/api/users/me');
-    final redirectUrl = Uri.parse('goatagent://auth');
+  oauth2.Client? client;
 
-    const clientId = "goatagent";
-    const clientSecret = "_F4%q2Eea3";
+  Future<bool> pickClient() async {
+    if (await storage.containsKey(key: storageKey)) {
+      var credentials =
+          oauth2.Credentials.fromJson((await storage.read(key: storageKey))!);
+      client = oauth2.Client(credentials,
+          identifier: clientId, secret: clientSecret);
+      print(await storage.readAll());
+      return true;
+    } else {
+      return false;
+    }
+  }
 
-    const storage = FlutterSecureStorage();
-    const storageKey = "identity";
-
-    Future<oauth2.Client> createClient() async {
-      // If logged in
-      if (await storage.containsKey(key: storageKey)) {
-        var credentials = oauth2.Credentials.fromJson(
-            storage.read(key: storageKey) as String);
-        return oauth2.Client(credentials,
-            identifier: clientId, secret: clientSecret);
-      }
-
-      var grant = oauth2.AuthorizationCodeGrant(
-        clientId,
-        authorizationEndpoint,
-        tokenEndpoint,
-        secret: clientSecret,
-        basicAuth: false,
-      );
-
-      var authorizationUrl = grant.getAuthorizationUrl(redirectUrl);
-
-      if (Platform.isAndroid || Platform.isIOS) {
-        // Let Goatpass know it is embed in an app
-        authorizationUrl.replace(
-            queryParameters: {"embedded": "yes"}
-              ..addAll(authorizationUrl.queryParameters));
-
-        // Use WebView to get authorization url
-        var responseUrl = await Navigator.of(context).push(MaterialPageRoute(
-          builder: (context) => AuthorizationPage(authorizationUrl),
-        ));
-
-        var responseUri = Uri.parse(responseUrl);
-        return await grant
-            .handleAuthorizationResponse(responseUri.queryParameters);
-      } else {
-        // TODO Use system browser to get url
-        throw UnimplementedError("unsupported platform");
-      }
+  Future<oauth2.Client> createClient(BuildContext context) async {
+    // If logged in
+    if (await pickClient()) {
+      return client!;
     }
 
-    try {
-      var client = await createClient();
-      var response = await client.read(userinfoEndpoint);
+    var grant = oauth2.AuthorizationCodeGrant(
+      clientId,
+      authorizationEndpoint,
+      tokenEndpoint,
+      secret: clientSecret,
+      basicAuth: false,
+    );
 
-      print('Logged in: $response');
+    var authorizationUrl = grant.getAuthorizationUrl(redirectUrl);
+
+    if (Platform.isAndroid || Platform.isIOS) {
+      // Let Goatpass know it is embed in an app
+      authorizationUrl = authorizationUrl.replace(
+          queryParameters: {"embedded": "yes"}
+            ..addAll(authorizationUrl.queryParameters));
+
+      // Use WebView to get authorization url
+      var responseUrl = await Navigator.of(context).push(MaterialPageRoute(
+        builder: (context) => AuthorizationPage(authorizationUrl),
+      ));
+
+      var responseUri = Uri.parse(responseUrl);
+      return await grant
+          .handleAuthorizationResponse(responseUri.queryParameters);
+    } else {
+      throw UnimplementedError("unsupported platform");
+    }
+  }
+
+  Future<void> login(BuildContext context) async {
+    try {
+      client = await createClient(context);
+      var userinfo = await client!.read(userinfoEndpoint);
+
+      storage.write(key: profileKey, value: userinfo);
+      storage.write(key: storageKey, value: client!.credentials.toJson());
+
+      print('Logged in: $userinfo');
     } catch (e) {
       print(e);
     }
   }
-}
 
-class AuthorizationPage extends StatelessWidget {
-  final Uri authorizationUrl;
-
-  const AuthorizationPage(this.authorizationUrl, {super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Connect with Goatpass'),
-      ),
-      body: WebViewWidget(
-        controller: WebViewController()
-          ..setJavaScriptMode(JavaScriptMode.unrestricted)
-          ..setBackgroundColor(Colors.indigo)
-          ..setNavigationDelegate(NavigationDelegate(
-            onNavigationRequest: (NavigationRequest request) {
-              if (request.url.startsWith('goatagent://auth')) {
-                Navigator.of(context).pop(request.url);
-                return NavigationDecision.prevent;
-              }
-              return NavigationDecision.navigate;
-            },
-          ))
-          ..loadRequest(authorizationUrl),
-      ),
-    );
+  Future<bool> isAuthorized() async {
+    const storage = FlutterSecureStorage();
+    return await storage.containsKey(key: storageKey);
   }
+
+  Future<dynamic> readProfiles() async {
+    const storage = FlutterSecureStorage();
+    return jsonDecode(await storage.read(key: profileKey) ?? "{}");
+  }
+
+  AuthGuard._internal();
 }

lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:goatagent/auth.dart';
+import 'package:goatagent/screens/auth.dart';
 import 'package:goatagent/firebase.dart';
 import 'package:goatagent/screens/account.dart';
 import 'package:goatagent/screens/dashboard.dart';
@@ -10,6 +11,7 @@ import 'layouts/navigation.dart';
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
+  AuthGuard().pickClient();
   initializeFirebase();
 
   runApp(GoatAgent());

lib/screens/account.dart

@@ -1,15 +1,33 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:goatagent/auth.dart';
+import 'package:goatagent/widgets/name_card.dart';
+import 'package:oauth2/oauth2.dart' as oauth2;
+
+import 'auth.dart';
 
 class AccountScreen extends StatelessWidget {
   const AccountScreen({super.key});
 
   @override
   Widget build(BuildContext context) {
-    return const Scaffold(
-      body: Center(
-        child: Text("你好"),
+    return Scaffold(
+      body: SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.symmetric(vertical: 5, horizontal: 20),
+          child: Column(
+            children: [
+              NameCard(
+                onLogin: () async {
+                  await AuthGuard().login(context);
+                },
+              ),
+            ],
+          ),
+        ),
       ),
     );
   }
-
-}
+}

lib/screens/auth.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+class AuthorizationPage extends StatelessWidget {
+  final Uri authorizationUrl;
+
+  const AuthorizationPage(this.authorizationUrl, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Connect with Goatpass'),
+      ),
+      body: WebViewWidget(
+        controller: WebViewController()
+          ..setJavaScriptMode(JavaScriptMode.unrestricted)
+          ..setBackgroundColor(Colors.indigo)
+          ..setNavigationDelegate(NavigationDelegate(
+            onNavigationRequest: (NavigationRequest request) {
+              if (request.url.startsWith('goatagent://auth')) {
+                Navigator.of(context).pop(request.url);
+                return NavigationDecision.prevent;
+              }
+              return NavigationDecision.navigate;
+            },
+          ))
+          ..loadRequest(authorizationUrl),
+      ),
+    );
+  }
+}

lib/widgets/name_card.dart

@@ -0,0 +1,101 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+import '../auth.dart';
+
+class NameCard extends StatelessWidget {
+  const NameCard({super.key, this.onLogin, this.onCheck});
+
+  final void Function()? onLogin;
+  final void Function()? onCheck;
+
+  Future<CircleAvatar> _getAvatar() async {
+    if (await AuthGuard().isAuthorized()) {
+      final profiles = await AuthGuard().readProfiles();
+      return CircleAvatar(backgroundImage: NetworkImage(profiles["picture"]));
+    } else {
+      return const CircleAvatar(child: Icon(Icons.account_circle));
+    }
+  }
+
+  Future<Column> _getDescribe() async {
+    if (await AuthGuard().isAuthorized()) {
+      final profiles = await AuthGuard().readProfiles();
+      return Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(
+            profiles["nick"],
+            style: const TextStyle(
+              fontSize: 20,
+              fontWeight: FontWeight.bold,
+            ),
+          ),
+          Text(profiles["email"])
+        ],
+      );
+    } else {
+      return const Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(
+            "Unauthorized",
+            style: TextStyle(
+              fontSize: 20,
+              fontWeight: FontWeight.bold,
+            ),
+          ),
+          Text("Click here to login in.")
+        ],
+      );
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      child: InkWell(
+        splashColor: Colors.indigo.withAlpha(30),
+        onTap: () async {
+          if (await AuthGuard().isAuthorized() && onCheck != null) {
+            onCheck!();
+          } else if (onLogin != null) {
+            onLogin!();
+          }
+        },
+        child: Padding(
+          padding: const EdgeInsets.all(20),
+          child: Row(
+            children: [
+              FutureBuilder<CircleAvatar>(
+                future: _getAvatar(),
+                builder:
+                    (BuildContext context, AsyncSnapshot<Widget> snapshot) {
+                  if (snapshot.hasData) {
+                    return snapshot.data!;
+                  } else {
+                    return const CircularProgressIndicator();
+                  }
+                },
+              ),
+              const SizedBox(width: 20),
+              FutureBuilder<Column>(
+                future: _getDescribe(),
+                builder:
+                    (BuildContext context, AsyncSnapshot<Column> snapshot) {
+                  if (snapshot.hasData) {
+                    return snapshot.data!;
+                  } else {
+                    return const Column();
+                  }
+                },
+              )
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}