Merge pull request #8 from 90lucasgabriel/08-auth

08 - Auth
90lucasgabriel · Apr 18, 2021 · f071a24 · f071a24
2 parents 5d4aea8 + 3b160c0
commit f071a24
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Showing 2 changed files with 74 additions and 24 deletions.
diff --git a/lib/main.dart b/lib/main.dart
@@ -8,32 +8,28 @@ void main() {
   runApp(Home());
 }
 
-class Home extends StatefulWidget {
-  @override
-  _HomeState createState() => _HomeState();
-}
-
-class _HomeState extends State<Home> {
-  void firebaseInit() async {
-    await Firebase.initializeApp();
-  }
-
-  @override
-  void initState() {
-    super.initState();
-    firebaseInit();
-  }
+class Home extends StatelessWidget {
+  final Future<FirebaseApp> _firebaseInit = Firebase.initializeApp();
 
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      title: 'Chat Flutter',
-      debugShowCheckedModeBanner: false,
-      theme: ThemeData(
-        primarySwatch: Colors.green,
-        iconTheme: IconThemeData(color: Colors.green),
-      ),
-      home: ChatScreen(),
+    return FutureBuilder(
+      future: _firebaseInit,
+      builder: (context, snapshot) {
+        if (snapshot.connectionState == ConnectionState.done) {
+          return MaterialApp(
+            title: 'Chat Flutter',
+            debugShowCheckedModeBanner: false,
+            theme: ThemeData(
+              primarySwatch: Colors.green,
+              iconTheme: IconThemeData(color: Colors.green),
+            ),
+            home: ChatScreen(),
+          );
+        }
+
+        return CircularProgressIndicator();
+      },
     );
   }
 }
diff --git a/lib/ui/chat_screen.dart b/lib/ui/chat_screen.dart
@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:firebase_storage/firebase_storage.dart';
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:google_sign_in/google_sign_in.dart';
 import 'dart:io';
 
 import 'package:chat/widgets/input.dart';
@@ -11,8 +13,51 @@ class ChatScreen extends StatefulWidget {
 }
 
 class _ChatScreenState extends State<ChatScreen> {
+  final GoogleSignIn googleSignin = GoogleSignIn();
+  User _user;
+
+  Future<User> _getUser() async {
+    try {
+      if (_user != null) return _user;
+
+      final GoogleSignInAccount googleUser = await GoogleSignIn().signIn();
+      final GoogleSignInAuthentication googleAuth =
+          await googleUser.authentication;
+
+      final GoogleAuthCredential credential = GoogleAuthProvider.credential(
+        accessToken: googleAuth.accessToken,
+        idToken: googleAuth.idToken,
+      );
+
+      final UserCredential userCredential =
+          await FirebaseAuth.instance.signInWithCredential(credential);
+
+      final User user = userCredential.user;
+
+      return user;
+    } catch (error) {
+      return null;
+    }
+  }
+
   void _sendMessage({String value, File file}) async {
-    Map<String, dynamic> data = {};
+    final User user = await _getUser();
+
+    if (user == null) {
+      Widget snackbar = SnackBar(
+        content: Text('Não foi possível realizar o login. Tente novamente.'),
+        backgroundColor: Colors.red,
+      );
+
+      ScaffoldMessenger.of(context).removeCurrentSnackBar();
+      ScaffoldMessenger.of(context).showSnackBar(snackbar);
+    }
+
+    Map<String, dynamic> data = {
+      'senderUid': user.uid,
+      'senderName': user.displayName,
+      'senderPhotoUrl': user.photoURL,
+    };
 
     if (file != null) {
       UploadTask task = FirebaseStorage.instance
@@ -32,6 +77,15 @@ class _ChatScreenState extends State<ChatScreen> {
     FirebaseFirestore.instance.collection('messages').add(data);
   }
 
+  @override
+  void initState() {
+    super.initState();
+
+    FirebaseAuth.instance.authStateChanges().listen((user) {
+      _user = user;
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(