视图函数在去注册用户之前需要进行验证，表单验证需要先下载 flask-wtf

在终端执行：

pip install flask-wtf

新建forms.py

import wtforms
from wtforms.validators import Email,Length,EqualTo
from models import UserModel,EmailCaptchaModel



# Form:主要就是用来验证前端返回的数据是否符合要求
class RegisterForm(wtforms.Form):
    email = wtforms.StringField(validators=[Email(message="邮箱格式错误！")])
    captcha = wtforms.StringField(validators=[Length(min=4, max=4, message="验证码格式错误!")]) 
    username = wtforms.StringField(validators=[Length(min=3, max=20, message="用户名格式错误!")])
    password = wtforms.StringField(validators=[Length(min=6, max=20, message="密码格式错误!")])
    password_confirm = wtforms.StringField(validators=[EqualTo("password", message="两次密码不一致")])

    # 自定义验证
    # 1.邮箱是否已经被注册
    def validate_email(self,field):
        email = field.data
        user = UserModel.query.filter_by(email=email).first()
        if user:
            raise wtforms.ValidationError(message="该邮箱已被注册！")

    # 2.验证码是否正确
    def validate_captcha(self,field):
        captcha = field.data
        email = self.email.data
        captcha_model = EmailCaptchaModel.query.filter_by(email=email,captcha=captcha).first()
        if not captcha_model:
            raise wtforms.ValidationError(message="邮箱或验证码错误！")

auth.py 代码

注意：
route要加methods参数，不然会报错

request.form 可以拿到前端提交上来的数据

在给数据库增加数据的时候需要给密码加密，防止密码泄露！！
password=generate_password_hash(password)

两种页面跳转方式：
1. return redirect(url_for(“auth.login”))
2. return redirect(“/auth/register1”)

#coding=utf-8
from flask import Blueprint,render_template,jsonify,redirect,url_for
from exts import mail,db
from flask_mail import Message
from flask import request
import string
import random
from models import EmailCaptchaModel,UserModel
from .forms import RegisterForm
from werkzeug.security import generate_password_hash

bp = Blueprint("auth",__name__,url_prefix="/auth")

@bp.route("/register1",methods=['GET', 'POST'])
def regeister():
    if request.method == 'GET':
        return render_template("register.html")
    
    # 使用requst.form拿到前端提交上来的数据
    else:
        form = RegisterForm(request.form)

        # form.calidate() 方法可以自动的调用表单中的验证器
        if form.validate():
            email = form.email.data
            username = form.username.data
            password = form.password.data
            user = UserModel(email=email,username=username,password=generate_password_hash(password))
            db.session.add(user)
            db.session.commit()
            return redirect(url_for("auth.login"))
        else:
            print(form.errors)
            return redirect("/auth/register1")