Flutter LinkedIn登录插件linkedin_login的使用

简介

linkedin_login 是一个用于Flutter应用程序实现LinkedIn OAuth 2.0 API的库。它允许开发者轻松地集成LinkedIn登录功能，获取用户信息，并处理OAuth授权流程。

安装

请参阅 pub.dev上的安装说明。

重要提示

在使用此库之前，请确保替换以下值：

final String redirectUrl = 'YOUR-REDIRECT-URL';
final String clientId = 'YOUR-CLIENT-ID';
final String clientSecret = 'YOUR-CLIENT-SECRET';

注意：clientSecret 字段仅在 LinkedInUserWidget 中需要。

示例代码

下面是一个完整的示例demo，展示了如何使用 linkedin_login 插件进行LinkedIn登录和获取用户信息。

main.dart

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

// @TODO IMPORTANT - you need to change variable values below
// You need to add your own data from LinkedIn application
// From: https://www.linkedin.com/developers/
// Please read step 1 from this link https://developer.linkedin.com/docs/oauth2
const String redirectUrl = 'https://your-app/callback'; // 替换为你的回调URL
const String clientId = 'YOUR_CLIENT_ID'; // 替换为你的客户端ID
const String clientSecret = 'YOUR_CLIENT_SECRET'; // 替换为你的客户端密钥

void main() => runApp(const MyApp());

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter LinkedIn demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: DefaultTabController(
        length: 2,
        child: Scaffold(
          appBar: AppBar(
            bottom: const TabBar(
              tabs: [
                Tab(icon: Icon(Icons.person), text: 'Profile'),
                Tab(icon: Icon(Icons.text_fields), text: 'Auth code'),
              ],
            ),
            title: const Text('LinkedIn Authorization'),
          ),
          body: const TabBarView(
            children: [
              LinkedInProfileExamplePage(),
              LinkedInAuthCodeExamplePage(),
            ],
          ),
        ),
      ),
    );
  }
}

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

  @override
  State createState() => _LinkedInProfileExamplePageState();
}

class _LinkedInProfileExamplePageState extends State<LinkedInProfileExamplePage> {
  UserObject? user;
  bool logoutUser = false;

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[
          LinkedInButtonStandardWidget(
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute<void>(
                  builder: (BuildContext context) => LinkedInUserWidget(
                    appBar: AppBar(
                      title: const Text('OAuth User'),
                    ),
                    destroySession: logoutUser,
                    redirectUrl: redirectUrl,
                    clientId: clientId,
                    clientSecret: clientSecret,
                    onError: (UserFailedAction e) {
                      print('Error: ${e.toString()}');
                      print('Error: ${e.stackTrace.toString()}');
                    },
                    onGetUserProfile: (UserSucceededAction linkedInUser) {
                      print('Access token ${linkedInUser.user.token}');
                      print('User sub: ${linkedInUser.user.sub}');

                      user = UserObject(
                        firstName: linkedInUser.user.givenName,
                        lastName: linkedInUser.user.familyName,
                        email: linkedInUser.user.email,
                        profileImageUrl: linkedInUser.user.picture,
                      );

                      setState(() {
                        logoutUser = false;
                      });

                      Navigator.pop(context);
                    },
                  ),
                  fullscreenDialog: true,
                ),
              );
            },
          ),
          LinkedInButtonStandardWidget(
            onTap: () {
              setState(() {
                user = null;
                logoutUser = true;
              });
            },
            buttonText: 'Logout',
          ),
          Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text('First: ${user?.firstName} '),
              Text('Last: ${user?.lastName} '),
              Text('Email: ${user?.email}'),
              Text('Profile image: ${user?.profileImageUrl}'),
            ],
          ),
        ],
      ),
    );
  }
}

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

  @override
  State createState() => _LinkedInAuthCodeExamplePageState();
}

class _LinkedInAuthCodeExamplePageState extends State<LinkedInAuthCodeExamplePage> {
  AuthCodeObject? authorizationCode;
  bool logoutUser = false;

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: <Widget>[
        LinkedInButtonStandardWidget(
          onTap: () {
            Navigator.push(
              context,
              MaterialPageRoute<void>(
                builder: (BuildContext context) => LinkedInAuthCodeWidget(
                  destroySession: logoutUser,
                  redirectUrl: redirectUrl,
                  clientId: clientId,
                  onError: (AuthorizationFailedAction e) {
                    print('Error: ${e.toString()}');
                    print('Error: ${e.stackTrace.toString()}');
                  },
                  onGetAuthCode: (AuthorizationSucceededAction response) {
                    print('Auth code ${response.codeResponse.code}');
                    print('State: ${response.codeResponse.state}');

                    authorizationCode = AuthCodeObject(
                      code: response.codeResponse.code,
                      state: response.codeResponse.state,
                    );
                    setState(() {});

                    Navigator.pop(context);
                  },
                ),
                fullscreenDialog: true,
              ),
            );
          },
        ),
        LinkedInButtonStandardWidget(
          onTap: () {
            setState(() {
              authorizationCode = null;
              logoutUser = true;
            });
          },
          buttonText: 'Logout user',
        ),
        Container(
          margin: const EdgeInsets.symmetric(horizontal: 16),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text('Auth code: ${authorizationCode?.code} '),
              Text('State: ${authorizationCode?.state} '),
            ],
          ),
        ),
      ],
    );
  }
}

class AuthCodeObject {
  AuthCodeObject({required this.code, required this.state});

  final String? code;
  final String? state;
}

class UserObject {
  UserObject({
    required this.firstName,
    required this.lastName,
    required this.email,
    required this.profileImageUrl,
  });

  final String? firstName;
  final String? lastName;
  final String? email;
  final String? profileImageUrl;
}

关键点说明

1. 配置LinkedIn应用：你需要在LinkedIn开发者平台创建一个应用，并获取clientId、clientSecret和redirectUrl。
2. LinkedInUserWidget：用于获取用户的完整信息，包括姓名、电子邮件和头像等。
3. LinkedInAuthCodeWidget：用于仅获取授权码，适用于只需要授权而不直接获取用户信息的场景。
4. 登出用户：通过设置destroySession为true来清除会话并登出用户。

希望这个示例能帮助你更好地理解和使用 linkedin_login 插件。如果你有任何问题或需要进一步的帮助，请随时提问！