Flutter身份验证插件hng_authentication的使用

标题

HNG_Authentication

内容

A Flutter package for adding authentication to your application. 这个包为您的应用程序添加了身份验证功能。这个包提供客户端调用注册、登录、注销等功能，并且可以检查当前登录用户。
This package can be used in any HNG task involving authentication. 这个包可以在任何涉及身份验证的HNG任务中使用。

使用说明

要使用此插件，请在pubspec.yaml文件中添加hng_authentiction作为依赖项。

示例代码

import 'package:flutter/material.dart';
import 'package:hng_authentication/authentication.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    final TextEditingController nameController = TextEditingController();
    final TextEditingController emailController = TextEditingController();
    final TextEditingController passwordController = TextEditingController();

    return MaterialApp(
      title: 'Authentication Example',
      routes: {
        '/': (context) => RegistrationForm(
              emailController: emailController,
              successRoutePage: '/home', 
              nameController: nameController, 
              passwordController: passwordController, // Use the route name here
            ),
        '/home': (context) => const Home(), // Define a route for Home
      },
      initialRoute: '/',
    );
  }
}

class Home extends StatefulWidget {
  const Home({super.key});

  @override
  State&lt;Home&gt; createState() =&gt; _HomeState();
}

class _HomeState extends State&lt;Home&gt; {
  @override
  Widget build(BuildContext context) {
    return const Placeholder();
  }
}

class RegistrationForm extends StatefulWidget {
  late final TextEditingController nameController;
  late final TextEditingController emailController;
  late final TextEditingController passwordController;
  final String successRoutePage;
  String btnText;
  Color btnColor;

  RegistrationForm({
    super.key,
    required this.nameController,
    required this.emailController,
    required this.passwordController,
    required this.successRoutePage,
    this.btnText = 'Submit', // Provide a default button text
    this.btnColor =
        Colors.green, // Allow the button color to be null (optional)
  });

  @override
  _RegistrationFormState createState() =&gt; _RegistrationFormState();
}

class _RegistrationFormState extends State&lt;RegistrationForm&gt; {
  bool _obscurePassword = true;
  @override
  Widget build(BuildContext context) {
    final screenWidth = MediaQuery.of(context).size.width;

    return Scaffold(
      body: SafeArea(
        child: Padding(
          padding: EdgeInsets.only(
            left: screenWidth * 0.04,
            right: screenWidth * 0.04,
            top: 20,
            bottom: 0,
          ),
          child: SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const SizedBox(
                  height: 20,
                ),
                Text(
                  "Create Account",
                  style: GoogleFonts.lato(
                    textStyle: TextStyle(
                      letterSpacing: .5,
                      fontSize: 20,
                    ),
                  ),
                ),
                const SizedBox(
                  height: 10,
                ),
                const SizedBox(
                  height: 20,
                ),
                RoundedBorderedTextField(
                  hintText: "Username",
                  controller: widget.nameController,
                ),
                const SizedBox(
                  height: 20,
                ),
                RoundedBorderedTextField(
                  hintText: "Email Address",
                  keyboardType: TextInputType.emailAddress,
                  controller: widget.emailController,
                ),
                const SizedBox(
                  height: 20,
                ),
                RoundedBorderedTextField(
                  hintText: "Enter Password",
                  obscureText: _obscurePassword,
                  controller: widget.passwordController,
                  isPass: true,
                  icon: IconButton(
                    icon: Icon(
                      _obscurePassword
                          ? Icons.visibility_off
                          : Icons.visibility,
                      color: const Color.fromRGBO(115, 106, 185, 1),
                    ),
                    onPressed: () {
                      setState(() {
                        _obscurePassword = !_obscurePassword;
                      });
                    },
                  ),
                ),
                const SizedBox(
                  height: 20,
                ),
                RoundedBorderedTextField(
                  hintText: "Confirm Password",
                  obscureText: _obscurePassword,
                  validator: (val) {
                    if (val?.isEmpty ?? true) {
                      return 'Please enter your password';
                    } else if ((val?.length ?? 0) &lt; 6) {
                      return 'Password is not up to 6 characters';
                    } else if (((val?.length ?? 0) &gt;= 6) &amp;&amp;
                        ((val ?? "") != widget.passwordController.text)) {
                      return "Password texts don't match";
                    } else {
                      return null;
                    }
                  },
                  // controller: widget.passwordController,
                  isPass: true,
                  icon: IconButton(
                    icon: Icon(
                      _obscurePassword
                          ? Icons.visibility_off
                          : Icons.visibility,
                      color: const Color.fromRGBO(115, 106, 185, 1),
                    ),
                    onPressed: () {
                      setState(() {
                        _obscurePassword = !_obscurePassword;
                      });
                    },
                  ),
                ),
                const SizedBox(
                  height: 20,
                ),
                SizedBox(
                  width: double.infinity,
                  height: 50,
                  child: ElevatedButton(
                    style: ButtonStyle(
                      backgroundColor: MaterialStateProperty.all<Color>(
                        widget.btnColor,
                      ),
                    ),
                    onPressed: () async {
                      final email = (widget.emailController).text;
                      final password = (widget.passwordController).text;
                      final name = widget.nameController.text;
                      final authRepository = Authentication();
                      final data = await authRepository.signUp(email, name, password);
                      if (data != null) {
                        // Registration failed, display an error message

                        showSnackbar(
                            context, Colors.black, 'SignUp successful');
                        print('sign up Email &gt;&gt;&gt; ${data.email}');
                        print('sign up id &gt;&gt;&gt; ${data.id}');
                        print('sign up created at &gt;&gt;&gt; ${data.createdAt}');
                        Navigator.of(context)
                            .pushNamed(widget.successRoutePage);
                      } else {
                        print('errror:   eeeeeee');
                        showSnackbar(context, Colors.red, 'SignUp ERROR');
                      }
                    },
                    child: Text(
                      widget.btnText,
                      style: GoogleFonts.lato(
                        textStyle: TextStyle(
                          letterSpacing: .16,
                          fontSize: 16,
                          fontWeight: FontWeight.w400,
                          color: Colors.white,
                        ),
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

示例代码解释

导入必要的包：

import 'package:flutter/material.dart';
import 'package:hng_authentication/authentication.dart';

主函数：
```
void main() {
  runApp(const MyApp());
}
```
在这里，我们创建了一个Flutter应用的入口点。

MyApp类：

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    final TextEditingController nameController = TextEditingController();
    final TextEditingController emailController = TextEditingController();
    final TextEditingController passwordController = TextEditingController();

    return MaterialApp(
      title: 'Authentication Example',
      routes: {
        '/': (context) => RegistrationForm(
              emailController: emailController,
              successRoutePage: '/home', 
              nameController: nameController, 
              passwordController: passwordController, // Use the route name here
            ),
        '/home': (context) => const Home(), // Define a route for Home
      },
      initialRoute: '/',
    );
  }
}

这里定义了应用的根路由和页面跳转逻辑。

Home类：

class Home extends StatefulWidget {
  const Home({super.key});

  @override
  State&lt;Home&gt; createState() =&gt; _HomeState();
}

class _HomeState extends State&lt;Home&gt; {
  @override
  Widget build(BuildContext context) {
    return const Placeholder();
  }
}

这里定义了主页的基本布局。

RegistrationForm类：

更多关于Flutter身份验证插件hng_authentication的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

gougou168 1楼•7 天前

更多关于Flutter身份验证插件hng_authentication的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

当然，下面是一个关于如何在Flutter项目中使用hng_authentication插件进行身份验证的示例代码。请注意，由于hng_authentication可能是一个虚构或特定组织的插件（在Flutter社区中没有广泛知名的同名插件），我会基于一般的身份验证插件的使用方式来提供一个示例。如果hng_authentication有特定的API和功能，你需要参考其官方文档进行调整。

首先，确保你已经将hng_authentication插件添加到你的pubspec.yaml文件中：

dependencies:
  flutter:
    sdk: flutter
  hng_authentication: ^x.y.z  # 替换为实际的版本号

然后，运行flutter pub get来安装插件。

接下来，在你的Flutter应用中，你可以按照以下步骤使用hng_authentication进行身份验证：

1. 导入插件

在你的Dart文件中导入插件：

import 'package:hng_authentication/hng_authentication.dart';

2. 配置和使用插件

假设hng_authentication提供了用户注册、登录和注销的功能，下面是一个简单的使用示例：

import 'package:flutter/material.dart';
import 'package:hng_authentication/hng_authentication.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Authentication Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: AuthenticationScreen(),
    );
  }
}

class AuthenticationScreen extends StatefulWidget {
  @override
  _AuthenticationScreenState createState() => _AuthenticationScreenState();
}

class _AuthenticationScreenState extends State<AuthenticationScreen> {
  final HngAuthentication _hngAuth = HngAuthentication();
  bool _isLoggedIn = false;

  void _registerUser() async {
    try {
      // 假设register方法需要用户名和密码
      await _hngAuth.register(username: 'testuser', password: 'securepassword');
      print('User registered successfully');
      // 注册成功后可以自动登录或跳转到其他页面
    } catch (e) {
      print('Error registering user: $e');
    }
  }

  void _loginUser() async {
    try {
      // 假设login方法需要用户名和密码
      bool isLoggedIn = await _hngAuth.login(username: 'testuser', password: 'securepassword');
      if (isLoggedIn) {
        setState(() {
          _isLoggedIn = true;
        });
        print('User logged in successfully');
      } else {
        print('Failed to log in user');
      }
    } catch (e) {
      print('Error logging in user: $e');
    }
  }

  void _logoutUser() async {
    try {
      await _hngAuth.logout();
      setState(() {
        _isLoggedIn = false;
      });
      print('User logged out successfully');
    } catch (e) {
      print('Error logging out user: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Authentication Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextButton(
              onPressed: _registerUser,
              child: Text('Register'),
            ),
            TextButton(
              onPressed: _loginUser,
              child: Text('Login'),
            ),
            if (_isLoggedIn)
              TextButton(
                onPressed: _logoutUser,
                child: Text('Logout'),
              ),
          ],
        ),
      ),
    );
  }
}

注意事项

插件方法：上述代码中的_hngAuth.register、_hngAuth.login和_hngAuth.logout方法是假设的。你需要根据hng_authentication插件的实际API进行调用。
错误处理：在实际应用中，你应该更细致地处理错误，比如显示错误消息给用户。
UI设计：上述UI非常简单，你可能需要根据实际需求进行更复杂的UI设计。
安全性：确保你的身份验证过程安全，包括使用HTTPS、加密存储敏感信息等。
文档：务必参考hng_authentication插件的官方文档，了解其所有功能和最佳实践。

由于hng_authentication可能是一个特定或虚构的插件，如果上述示例与你的实际插件不符，请参考插件的官方文档进行调整。