在Flatter中更改firebase用户的密码

我想更改firebase帐户的密码。要做到这一点，用户应在输入之前输入旧密码。如果正确的话，他可以换通行证。我使用了这段代码，它只用于更改通行证，而不是比较旧的通行证

void _changePassword(String password) async{
//Create an instance of the current user. 
FirebaseUser user = await FirebaseAuth.instance.currentUser();

//Pass in the password to updatePassword.
user.updatePassword(password).then((_){
  print("Successfully changed password");
}).catchError((error){
  print("Password can't be changed" + error.toString());
  //This might happen, when the wrong password is in, the user isn't found, or if the user hasn't logged in recently.
});
}

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它将不允许您验证其以前的密码或旧密码。它将直接为您发送电子邮件，您需要在那里添加新密码。并且您必须再次返回应用程序，您的密码将在您尝试登录时更新。

这个想法是通过使用firebaseAuth在用户中辞职来验证旧密码，您可以通过将user.email传递到字符串来获取用户电子邮件，并让用户输入旧密码。如果登录过程失败，则不应更改密码

void _changePassword(String password) async {
    FirebaseUser user = await FirebaseAuth.instance.currentUser();
    String email = user.email;

    //Create field for user to input old password

    //pass the password here
    String password = "password";
    String newPassword = "password";

    try {
      UserCredential userCredential = await FirebaseAuth.instance.signInWithEmailAndPassword(
          email: email,
          password: password,
      );
      
      user.updatePassword(newPassword).then((_){
        print("Successfully changed password");
      }).catchError((error){
        print("Password can't be changed" + error.toString());
        //This might happen, when the wrong password is in, the user isn't found, or if the user hasn't logged in recently.
      });
    } on FirebaseAuthException catch (e) {
      if (e.code == 'user-not-found') {
        print('No user found for that email.');
      } else if (e.code == 'wrong-password') {
        print('Wrong password provided for that user.');
      }
    }
  }

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如果用户最近没有登录，Firebase将自动要求他们在更改密码（或执行其他敏感操作）之前重新验证。因此，您通常只需要在Firebase告诉您时要求用户重新验证

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发生这种情况时，请按照上的文档中的步骤进行操作。

因此，您希望用户在更改旧密码之前先验证它？它成功了！谢谢