如何使用解析服务器实现flutter应用程序中的登录方法合并？

Question

在我的移动应用程序中，我有 4 种登录方法：

1. 使用电子邮件和密码正常登录/登录
2. 谷歌登录
3. Flutter Facebook 验证
4. 使用 Apple 登录

问题是，例如，当我使用 Google Sign In 和 [email protected] 创建帐户时，然后我注销并尝试使用使用同一电子邮件创建的 Facebook 帐户登录，就会出现错误。总结一下每个登录功能都是独立工作的。

我想知道是否可以通过云功能来处理这个问题？

这是颤振代码：

 ///GOOGLE
  static Future<bool> signWithGoogle() async {
    // return false;
    final GoogleSignIn _googleSignIn = GoogleSignIn( scopes: ['email'] );

    GoogleSignInAccount? account = await _googleSignIn.signIn();
    googleSignInAccount = account;
    if (account == null) return false;
    GoogleSignInAuthentication authentication = await account.authentication;

    String? email = _googleSignIn.currentUser!.email;

    final bool firstLogin = await isFirstLogin(email);
    ParseResponse response;

    if (firstLogin){
      response = await ParseUser.loginWith(
        'google',
        google(
            authentication.accessToken!,
            _googleSignIn.currentUser!.id,
            authentication.idToken!
        ),
        username: _googleSignIn.currentUser!.displayName,
        email: email,
      );
    }else {
      response = await ParseUser.loginWith(
        'google',
        google(
            authentication.accessToken!,
            _googleSignIn.currentUser!.id,
            authentication.idToken!
        ),
      );
    }


    if (response.success){
      return _setDeviceId(response.result);
    }else
      _handleError(response);

    return false;
  }

  static Future<GoogleSignInAccount?> googleForDataOnly() async {
    final GoogleSignIn _googleSignIn = GoogleSignIn( scopes: ['email'] );

    return await _googleSignIn.signIn();
  }

  ///FACEBOOK
  static Future<bool> signWithFacebook() async {
    final LoginResult result = await FacebookAuth.instance.login(permissions: [
      'email',
      'public_profile',
      'user_location'
    ]);
    if (result.status == LoginStatus.cancelled) return false;

    if (result.status == LoginStatus.success) {
      if (result.accessToken == null) {
        Fluttertoast.showToast(msg: Translate.unknownError());
        return false;
      }

      final userData = await FacebookAuth.instance.getUserData();
      String? email = userData['email'];

      if (email == null || email.isEmpty){
        Fluttertoast.showToast(msg: Translate.emailPermissionRequired());
        return false;
      }

      final bool firstLogin = await isFirstLogin(email);
      ParseResponse response;

      if (firstLogin){
        response = await ParseUser.loginWith(
          'facebook',
          facebook(result.accessToken!.token,
              result.accessToken!.userId,
              result.accessToken!.expires
          ),
          email: email,
          username: userData['name']
        );
      }else {
        response = await ParseUser.loginWith(
          'facebook',
          facebook(result.accessToken!.token,
              result.accessToken!.userId,
              result.accessToken!.expires
          ),
        );
      }

      if (response.success) return _setDeviceId(response.result);
      else _handleError(response);

    }

    return false;
  }

  static Future<bool> facebookDataOnly() async {
    final LoginResult result = await FacebookAuth.instance.login(permissions: [
      'email',
      'public_profile',
      'user_location'
    ]);
    if (result.status == LoginStatus.cancelled) return false;

    if (result.status == LoginStatus.success) {
      if (result.accessToken == null) {
        Fluttertoast.showToast(msg: Translate.unknownError());
        return false;
      }

     return true;
    }

    return false;
  }

  ///APPLE
  static Future<bool> signWithApple() async {
    final AuthorizationCredentialAppleID credential = await SignInWithApple.getAppleIDCredential(
      scopes: [AppleIDAuthorizationScopes.email, AppleIDAuthorizationScopes.fullName],
    );

    final String? email = credential.email;
    final String? name = credential.givenName;
    final String? famName = credential.familyName;
    String? userName;
    if (name != null && famName != null){
      userName = '$name $famName';
    }

    if (email == null) {
      Fluttertoast.showToast(msg: Translate.invalidEmail());
      return false;
    }

    final bool firstLogin = await isFirstLogin(email);
    print(firstLogin);
    ParseResponse response;

    if (firstLogin){
      response = await ParseUser.loginWith(
        'apple',
        apple(
            credential.identityToken!,
            credential.userIdentifier!
        ),
        email: email,
        username: userName
      );
    }else {
      response = await ParseUser.loginWith(
        'apple',
        apple(
            credential.identityToken!,
            credential.userIdentifier!
        ),
      );
    }


    if (response.success){
      return _setDeviceId(response.result);
    }else {
      _handleError(response);
    }

    _sendLoginInfo(credential, response.success);

    return false;
  }

Answer 1

您缺少的是一个名为 链接用户 的功能，我在 Flutter SDK 中没有找到内置函数，因此我附加了来自 REST API 的文档。

Parse 允许您将用户与 Twitter 和 Facebook 等服务链接起来，使您的用户能够使用其现有身份注册或登录您的应用程序。这是通过注册和更新 REST 端点来完成的，方法是在

authData

字段中提供您希望链接到用户的服务的身份验证数据。一旦您的用户与某项服务关联，该服务的

authData

将与该用户一起存储，并可通过登录进行检索。

您应该使用登录提供程序数据填充用户的

authData

属性，以便将其链接到用户。这可以借助云代码或来自客户端的简单 http 请求来完成。假设您将把它集成到您的 flutter 应用程序中，链接 facebook 登录提供程序的请求应由以下内容组成：

# Use PUT http method
curl -X PUT \
  # Add App ID to header
  -H "X-Parse-Application-Id: ${APPLICATION_ID}" \
  # Add Client Key to header
  -H "X-Parse-Client-Key: ${CLIENT_KEY}" \
  # Add Session Token to header of the user you're linking the login provider to
  -H "X-Parse-Session-Token: r:samplei3l83eerhnln0ecxgy5" \
  # Add Contet-Type to header
  -H "Content-Type: application/json" \
  -d '{
        "authData": {
          "facebook": {
            "id": "123456789",
            "access_token": "SaMpLeAAibS7Q55FSzcERWIEmzn6rosftAr7pmDME10008bWgyZAmv7mziwfacNOhWkgxDaBf8a2a2FCc9Hbk9wAsqLYZBLR995wxBvSGNoTrEaL",
            "expiration_date": "2022-01-01T12:23:45.678Z"
          }
        }
      }' \
  # Call endpoint for the user you're linking the login provider to
  https://YOUR.PARSE-SERVER.HERE/parse/users/{user_object_id}