Flask+ldap3认证报错LDAPPasswordIsMandatoryError求助

LDAPPasswordIsMandatoryError: password is mandatory in simple bind 错误说明传入LDAP绑定请求的密码为空，根源出在表单字段定义异常和未正确触发表单验证两个环节：

1. LoginForm.py 中密码字段的定义存在语法错误（多余空行、缩进混乱），导致字段无法正确接收用户输入；
2. main.py 中仅通过 request.method == 'POST' 判断提交，未触发Flask-WTF的表单验证规则，空密码会直接传入LDAP认证函数。

1. 修复LoginForm.py的语法错误 #

修正密码字段的格式问题，同时移除重复的autofocus属性（仅保留用户名字段的自动聚焦）：

from main import app
from flask_wtf import Form
from wtforms import StringField, PasswordField, validators


class LoginValidation(Form):
    user_name_pid = StringField('', [validators.DataRequired()],
                                render_kw={'autofocus': True, 'placeholder': 'Enter User'})

    user_pid_Password = PasswordField('', [validators.DataRequired()],
                                      render_kw={'placeholder': 'Enter your login Password'})

2. 修正main.py的表单验证逻辑 #

改用Flask-WTF提供的form.validate_on_submit()方法，确保表单验证规则生效后再执行LDAP认证：

@app.route('/login', methods=['GET','POST'])
def index():
    form = LoginValidation()
 
    if form.validate_on_submit():
        login_id = form.user_name_pid.data
        login_password = form.user_pid_Password.data
 
        login_msg = global_ldap_authentication(login_id, login_password)
 
        if login_msg == "Success":
            success_message = "*** Authentication Success "
            return render_template('success.html', success_message=success_message)
        else:
            error_message = f"*** Authentication Failed - {login_msg}"
            return render_template("error.html", error_message=str(error_message))
 
    return render_template('login.html', form=form)

3. 可选：增加LDAP认证函数的参数校验 #

在global_ldap_authentication.py中添加前置校验，提前拦截空值避免触发LDAP异常：

def global_ldap_authentication(user_name, user_pwd):
    # 新增参数校验
    if not user_name or not user_pwd:
        return "Username or password cannot be empty"
 
    ldap_user_name = user_name
    ldap_user_pwd = user_pwd
 
    # 后续原有代码保持不变
    ldsp_server = f"ldap://localhost:389"
    root_dn = "dc=example,dc=org"
    user = f'cn={ldap_user_name},{root_dn}'
 
    print(user)
    server = Server(ldsp_server, get_info=ALL)
 
    connection = Connection(server,
                            user=user,
                            password=ldap_user_pwd)
    if not connection.bind():
        print(f" *** Cannot bind to ldap server: {connection.last_error} ")
        l_success_msg = f' ** Failed Authentication: {connection.last_error}'
    else:
        print(f" *** Successful bind to ldap server")
        l_success_msg = 'Success'
 
    return l_success_msg

内容的提问来源于stack exchange，提问作者ryansmith174