TV Channel Website: Logout Functionality
Tags: webdev, tutorial, python, bottle
Published: 2022-08-26 08:13:00

GitHub: [https://github.com/Sokhavuth/TV-Channel](https://github.com/Sokhavuth/TV-Channel)
Vercel: [https://khmerweb-tv-channel.vercel.app/login](https://khmerweb-tv-channel.vercel.app/login)
<br/>

<p>When a user logs out of the dashboard, we need to delete his/her user data encoded as a jwt stored in Redis database. We need also to delete the session id stored as a cookie in his/her browser. After deleting both jwt and cookie, we can send the user back to the login page.</p>

```py
# routes/frontend/login.py

from bottle import Bottle, get, post, redirect
from controllers.frontend.login import Login
import config

app = Bottle()
login = Login()

@app.get("/")
def getLogin():
    if(config.checkLogged()):
        return redirect("/admin/post")
    else:
        return login.getPage()


@app.post("/")
def postLogin():
    return login.postItem()


@app.get("/logout")
def logout():
    if(config.checkLogged()):
        return login.logOut()
    else:
       return redirect("/login") 
        

```
```py
# controllers/frontend/login.py

import config, copy, hashlib, jwt, uuid
from datetime import datetime, timezone, timedelta
from bottle import template, request, response, redirect
from models.user import User


class Login:
    def __init__(self):
        settings = copy.deepcopy(config.settings)
        self.setup = settings()
        self.redis = config.redis
        self.secret_key = config.secret_key
        self.user = User()


    def getPage(self):
        self.setup["pageTitle"] = "Log into Admin Page"
        self.setup["route"] = "/login"

        return template("base", data=self.setup)


    def postItem(self):
        password = request.forms.getunicode('password')
        email = request.forms.getunicode('email')

        user = self.user.checkUser(email)
        
        if user:
            passw = hashlib.sha512(password.encode("utf-8") + user["salt"]).hexdigest()
            if(passw == user["password"]):
                self.setup["pageTitle"] = 'Post Page'

                payload = {
                    "id": user["id"],
                    "role": user["role"],
                    "name": user["title"],
                }

                exp = datetime.now(timezone.utc) + timedelta(seconds=60*60*24*15)
                
                myjwt = jwt.encode({"user": payload, "exp": exp }, self.secret_key, algorithm="HS256")
                sessionid = uuid.uuid4().hex
                self.redis.set(sessionid, myjwt)
                self.redis.expire(sessionid, 60*60*24*15)
                response.set_cookie('sessionid', sessionid, path='/', secret=self.secret_key)

                return redirect('/admin/post')
            else:
                self.setup["pageTitle"] = 'Log into Admin Page'
                self.setup['message'] = 'Your password is wrong!'
                self.setup['route'] = '/login'
                return template("base", data=self.setup)
        else:
            self.setup["pageTitle"] = 'Log into Admin Page'
            self.setup['message'] = 'Your Email is wrong!'
            self.setup['route'] = '/login'
            return template("base", data=self.setup)


    def logOut(self):
        sessionid = request.get_cookie('sessionid', secret=self.secret_key)
        if(sessionid):
            self.redis.delete(sessionid)
            response.delete_cookie("sessionid", path="/", secret=self.secret_key)
            return redirect("/login")


```