views.py

class LogoutView(View):
    def get(self, request):
        logout(request)
        return redirect('welcome')


class WelcomeView(View):
    def get(self, request):
        if request.user.is_authenticated:
            return redirect('api-documentation')
        return render(request, 'home/welcome.html')

    def post(self, request):
        context = {
            'data': request.POST,
            'has_error': False
        }
        username = request.POST.get('username')
        password = request.POST.get('password')
        if username == '':
            messages.add_message(request, messages.ERROR,
                                 'Username is required')
            context['has_error'] = True
        if password == '':
            messages.add_message(request, messages.ERROR,
                                 'Password is required')
            context['has_error'] = True
        user = authenticate(request, username=username, password=password)

        if not user and not context['has_error']:
            messages.add_message(request, messages.ERROR, 'Invalid login')
            context['has_error'] = True

        if context['has_error']:
            return render(request, 'home/welcome.html', status=401, context=context)

        group_names = []
        for group in user.groups.all():
            group_names.append(group.name)
        if "developers" in group_names or "partners" in group_names:
            login(request, user)
            return redirect('api-documentation')
        messages.add_message(request, messages.ERROR, 'Invalid login')
        return render(request, 'home/welcome.html', status=401, context=context)