使用字典数据库结构在 Flask 应用程序中进行身份验证

Question

我正在创建一个基本应用程序来演示使用会话在 Flask 中进行注册和登录活动。对于下面的代码，字典中可用的每个用户都应该能够登录。但是，该应用程序只接受名为 'Mary' 的第一个用户的登录。不明白哪里错了

from flask import Flask, app, session, render_template, request,redirect, url_for, jsonify
app = Flask(__name__)
app.config['SECRET_KEY'] = "Zd9TUg1aE03bHc28"

@app.route('/')
def load():
    return render_template("authusers.html")  

class Mydatabase:
 appdb=[{'username':'Mary','password':'Password@123'},
        {'username':'John','password':'Password@456'},
        {'username':'Tara','password':'Password@789'}]

mydbusers=Mydatabase()

@app.route('/login',methods = ['GET','POST'])  
def success():  
    if request.method == "POST":  
        username_val = request.form['user_id'] 
        userpassword_val = request.form['user_password'] 
        for authuser in Mydatabase.appdb:
            for authpassword in authuser.values():
                if authuser['username'] == username_val and authpassword['password'] == userpassword_val:
                 session['reg_user'] = username_val
                 return f'{session.get("reg_user")} have successfully logged into the application';  
                else:
                 return redirect(url_for('register'))        

@app.route('/logout', methods=['GET','POST'])  
def logout():  
    if 'reg_user' in session:  
        session.pop('reg_user',None)    
        return render_template("authusers.html") 

@app.route('/register', methods=['GET','POST'])
def register():
    return render_template('register.html')

@app.route('/reg_success',methods=['GET','POST'])
def reg_success():
    newusercred={'username':request.form['user_id'], 'password':request.form['user_password']}
    mydbusers.appdb.append(newusercred)
    # return jsonify(Mydatabase.appdb)
    return render_template("authusers.html")
     
        
if __name__=="__main__":
 app.run(debug=True)

Answer 1

我在你的代码中发现了一些逻辑问题

这样试试 ->

class Mydatabase:
 appdb=[{'username':'Mary','password':'Password@123'},
        {'username':'John','password':'Password@456'},
        {'username':'Tara','password':'Password@789'}]

username_val = 'Tara'
userpassword_val = 'Password@789'

d = [a for a in Mydatabase.appdb if a["username"] == username_val and a["password"]==userpassword_val]
if d:
    print(f'have successfully logged into the application')
else:
    print(f'Wrong credentials')

你的代码中有一些不需要的循环，你 return 即使在 else 部分。

使用字典数据库结构在 Flask 应用程序中进行身份验证

Authentication in Flask application using dictionary database structure

python

session

flask