How do you implement authentication and authorization? Authentication और authorization कैसे implement करते हैं?

# Django authentication
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.models import User
from django.contrib.auth.decorators import login_required

def register(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = User.objects.create_user(username=username, password=password)
        return redirect('login')

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('home')

def logout_view(request):
    logout(request)
    return redirect('login')

@login_required(login_url='login')
def dashboard(request):
    return render(request, 'dashboard.html')

# Flask authentication with Flask-Login
from flask_login import LoginManager, UserMixin, login_user, logout_user, login_required

login_manager = LoginManager()
login_manager.init_app(app)

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(100), unique=True)
    password = db.Column(db.String(100))

@app.route('/login', methods=['POST'])
def login():
    data = request.json
    user = User.query.filter_by(username=data['username']).first()
    if user and check_password_hash(user.password, data['password']):
        login_user(user)
        return jsonify({'status': 'logged in'})

@app.route('/dashboard')
@login_required
def dashboard():
    return jsonify({'user': current_user.username})

# FastAPI JWT authentication
from fastapi import Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthCredentials
from jose import JWTError, jwt

security = HTTPBearer()

def verify_token(credentials: HTTPAuthCredentials = Depends(security)):
    token = credentials.credentials
    try:
        payload = jwt.decode(token, 'secret_key', algorithms=['HS256'])
        return payload
    except JWTError:
        raise HTTPException(status_code=401, detail='Invalid token')

@app.get('/protected')
async def protected(payload = Depends(verify_token)):
    return {'user': payload}