From e7b47440169e660e3d710d8eb0e5d68b51e6bf05 Mon Sep 17 00:00:00 2001
From: Valentin CZERYBA <valcze80@gmail.com>
Date: Tue, 13 Sep 2022 00:11:43 +0200
Subject: [PATCH] Separate class and try catch

---
 covas_mobile/lib/classes/alert.dart |  31 +++++++
 covas_mobile/lib/main.dart          | 134 ++++++++++++----------------
 2 files changed, 87 insertions(+), 78 deletions(-)
 create mode 100644 covas_mobile/lib/classes/alert.dart

diff --git a/covas_mobile/lib/classes/alert.dart b/covas_mobile/lib/classes/alert.dart
new file mode 100644
index 0000000..0e30411
--- /dev/null
+++ b/covas_mobile/lib/classes/alert.dart
@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import '../main.dart';
+
+mixin ShowErrorDialog on State<LoginDemo> {
+  void showErrorDialog(BuildContext context, String text) {
+    // Create AlertDialog
+    AlertDialog dialog = AlertDialog(
+      title: Text("Error"),
+      content: Text(text),
+      actions: [
+        ElevatedButton(
+            child: Text("OK"),
+            style: ElevatedButton.styleFrom(
+                primary: Colors.red,
+                padding: EdgeInsets.symmetric(horizontal: 50, vertical: 20),
+                textStyle:
+                    TextStyle(fontSize: 15, fontWeight: FontWeight.normal)),
+            onPressed: () {
+              Navigator.of(context).pop("Yes, Of course!"); // Return value
+            }),
+      ],
+    );
+
+    // Call showDialog function to show dialog.
+    Future futureValue = showDialog(
+        context: context,
+        builder: (BuildContext context) {
+          return dialog;
+        });
+  }
+}
diff --git a/covas_mobile/lib/main.dart b/covas_mobile/lib/main.dart
index d5f8833..8eca0a7 100644
--- a/covas_mobile/lib/main.dart
+++ b/covas_mobile/lib/main.dart
@@ -4,6 +4,7 @@ import 'MyHomePage.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
 import 'dart:io';
+import 'classes/alert.dart';
 
 void main() {
   runApp(MyApp());
@@ -24,7 +25,7 @@ class LoginDemo extends StatefulWidget {
   _LoginDemoState createState() => _LoginDemoState();
 }
 
-class _LoginDemoState extends State<LoginDemo> {
+class _LoginDemoState extends State<LoginDemo> with ShowErrorDialog {
   TextEditingController inputPseudo = TextEditingController();
   TextEditingController inputPassword = TextEditingController();
   Future<void> _login(BuildContext context) async {
@@ -32,58 +33,62 @@ class _LoginDemoState extends State<LoginDemo> {
     var pseudo = inputPseudo.text;
     var password = inputPassword.text;
     if ((pseudo.isNotEmpty) && (password.isNotEmpty)) {
-      String credentials = "${pseudo}:${password}";
-      Codec<String, String> stringToBase64 = utf8.fuse(base64);
-      String encoded = stringToBase64.encode(credentials);
-      var response = await http.get(url, headers: {
-        HttpHeaders.authorizationHeader: 'Basic $encoded',
-      });
+      try {
+        String credentials = "${pseudo}:${password}";
+        Codec<String, String> stringToBase64 = utf8.fuse(base64);
+        String encoded = stringToBase64.encode(credentials);
+        var response = await http.get(url, headers: {
+          HttpHeaders.authorizationHeader: 'Basic $encoded',
+        });
 
-      if ((response.statusCode == 200) || (response.statusCode == 201)) {
-        Navigator.push(
-            context,
-            MaterialPageRoute(
-                builder: (_) => MyHomePage(title: 'Flutter Demo')));
-      } else {
-        var text = "";
-        switch (response.statusCode) {
-          case 400:
-            {
-              text = "Requête mal construite";
-            }
-            break;
-          case 406:
-            {
-              text = "Mot de passe incorrect";
-            }
-            break;
-          case 404:
-            {
-              text = "Utilisateur inconnu";
-            }
-            break;
-          case 403:
-            {
-              text = "Utilisateur desactive";
-            }
-            break;
-          case 410:
-            {
-              text = "Token invalide";
-            }
-            break;
-          case 500:
-            {
-              text = "Probleme interne du serveur";
-            }
-            break;
-          default:
-            {
-              text = "Probleme d'authentification inconnu";
-            }
-            break;
+        if ((response.statusCode == 200) || (response.statusCode == 201)) {
+          Navigator.push(
+              context,
+              MaterialPageRoute(
+                  builder: (_) => MyHomePage(title: 'Flutter Demo')));
+        } else {
+          var text = "";
+          switch (response.statusCode) {
+            case 400:
+              {
+                text = "Requête mal construite";
+              }
+              break;
+            case 406:
+              {
+                text = "Mot de passe incorrect";
+              }
+              break;
+            case 404:
+              {
+                text = "Utilisateur inconnu";
+              }
+              break;
+            case 403:
+              {
+                text = "Utilisateur desactive";
+              }
+              break;
+            case 410:
+              {
+                text = "Token invalide";
+              }
+              break;
+            case 500:
+              {
+                text = "Probleme interne du serveur";
+              }
+              break;
+            default:
+              {
+                text = "Probleme d'authentification inconnu";
+              }
+              break;
+          }
+          showErrorDialog(context, text);
         }
-        showErrorDialog(context, text);
+      } catch (e) {
+        showErrorDialog(context, "${e}");
       }
     } else {
       showErrorDialog(context, "Champ vide");
@@ -169,31 +174,4 @@ class _LoginDemoState extends State<LoginDemo> {
       ),
     );
   }
-
-  showErrorDialog(BuildContext context, String text) {
-    // Create AlertDialog
-    AlertDialog dialog = AlertDialog(
-      title: Text("Error"),
-      content: Text(text),
-      actions: [
-        ElevatedButton(
-            child: Text("OK"),
-            style: ElevatedButton.styleFrom(
-                primary: Colors.red,
-                padding: EdgeInsets.symmetric(horizontal: 50, vertical: 20),
-                textStyle:
-                    TextStyle(fontSize: 15, fontWeight: FontWeight.normal)),
-            onPressed: () {
-              Navigator.of(context).pop("Yes, Of course!"); // Return value
-            }),
-      ],
-    );
-
-    // Call showDialog function to show dialog.
-    Future futureValue = showDialog(
-        context: context,
-        builder: (BuildContext context) {
-          return dialog;
-        });
-  }
 }