meincantor-app/lib/Login.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'networking.dart';
import 'Dashboard.dart';

Future<bool> checkKey() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  String? api_key = await prefs.getString('api_key');
  return api_key != null && api_key.isNotEmpty;
}

class Login extends StatelessWidget {
  final userController = TextEditingController();
  final passwordController = TextEditingController();
  final otpController = TextEditingController();
  final devIdController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        double widgetWidth = constraints.maxWidth;
        double widgetHeight = constraints.maxHeight;
        var factor;

        if (widgetWidth <= 600) {
          factor = 1;
        } else if (widgetWidth <= 1400) {
          factor = 2;
        } else if (widgetWidth <= 2000) {
          factor = 3;
        }

        return Scaffold(
            appBar: AppBar(
              title: Text("Anmelden"),
            ),
            body: Center(
                child: SingleChildScrollView(
                    child: Padding(
                        padding: EdgeInsets.fromLTRB(20, 20, 20, 20),
                        child: Container(
                          constraints: BoxConstraints(
                            maxWidth:
                                MediaQuery.of(context).size.width / factor,
                          ),
                          child: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              Image.asset("assets/images/meincantor_r.png",
                                  height: 192, width: 192),
                              Divider(),
                              AutofillGroup(
                                  child: Column(
                                children: [
                                  TextField(
                                    autofillHints: [AutofillHints.username],
                                    decoration: InputDecoration(
                                      icon: Icon(CupertinoIcons.person),
                                      border: OutlineInputBorder(),
                                      labelText: 'Benutzername',
                                    ),
                                    controller: userController,
                                  ),
                                  Divider(),
                                  TextField(
                                    autofillHints: [AutofillHints.password],
                                    decoration: InputDecoration(
                                      icon: Icon(CupertinoIcons.lock),
                                      border: OutlineInputBorder(),
                                      labelText: 'Passwort',
                                    ),
                                    obscureText: true,
                                    controller: passwordController,
                                  ),
                                ],
                              )),
                              Divider(),
                              TextField(
                                decoration: InputDecoration(
                                  icon: Icon(CupertinoIcons.lock),
                                  border: OutlineInputBorder(),
                                  labelText: '2F2-Code (OTP) [falls aktiviert]',
                                ),
                                obscureText: true,
                                controller: otpController,
                              ),
                              Divider(),
                              TextField(
                                decoration: InputDecoration(
                                  icon: Icon(CupertinoIcons.device_laptop),
                                  border: OutlineInputBorder(),
                                  labelText: 'Gerätebezeichnung',
                                ),
                                controller: devIdController,
                              ),
                              Divider(),
                              OutlinedButton(
                                  onPressed: () async {
                                    SharedPreferences prefs =
                                        await SharedPreferences.getInstance();
                                    String api_key = await getToken(
                                        userController.text,
                                        passwordController.text,
                                        otpController.text,
                                        devIdController.text);
                                    print('Set new API key to $api_key');
                                    await prefs.setString('api_key', api_key);
                                    dynamic userinfo = jsonDecode(
                                        await getUserInfo(
                                            userController.text,
                                            passwordController.text,
                                            otpController.text,
                                            devIdController.text));
                                    await prefs.setString(
                                        'user', userinfo['preferred_username']);
                                    await prefs.setString(
                                        'name', userinfo['name']);
                                    if (prefs.getString('api_key') != null &&
                                        prefs
                                            .getString('api_key')!
                                            .isNotEmpty) {
                                      Navigator.pushReplacement(
                                        context,
                                        MaterialPageRoute(
                                            builder: (context) => Dashboard()),
                                      );
                                    }
                                  },
                                  child: Text("Anmelden"))
                            ],
                          ),
                        )
                    )
                )
            )
        );
      },
    );
  }
}