django tekore

import tekore as tk
from django.shortcuts import render
from django.http import HttpResponse
from django.shortcuts import redirect

conf = tk.config_from_environment()
cred = tk.Credentials(*conf)
spotify = tk.Spotify()

auths = {}  # Ongoing authorisations: state -> UserAuth
users = {}  # User tokens: state -> token (use state as a user ID)

in_link = '<a href="/login">login</a>'
out_link = '<a href="/logout">logout</a>'
login_msg = f'You can {in_link} or {out_link}'

# Create your views here.
def login(request):
    if 'user' in request.session:
        return redirect('/')

    scope = tk.scope.every
    auth = tk.UserAuth(cred, scope)
    auths[auth.state] = auth

    return redirect(auth.url)
    # return HttpResponse('testing login')

def logout(request):
    uid = request.session.pop('user', None)
    if uid is not None:
        users.pop(uid, None)
    return redirect('/')

def home(request):
    user = request.session.get('user', None)
    token = users.get(user, None)
    # Return early if no login or old session
    if user is None or token is None:
        request.session.pop('user', None)
        return HttpResponse(f'User ID: None<br>{login_msg}')
    page = f'User ID: {user}<br>{login_msg}'
    if token.is_expiring:
        token = cred.refresh(token)
        users[user] = token
    try:
        with spotify.token_as(token):
            playback = spotify.playback_currently_playing()
        item = playback.item.name if playback else None
        page += f'<br>Now playing: {item}'
    except tk.HTTPError:
         page += '<br>Error in retrieving now playing!'
    return HttpResponse(page)
    # return HttpResponse('testing home')

def callback(request):
    code = request.GET.get('code', None)
    state = request.GET.get('state', None)
    auth = auths.pop(state, None)
    if auth is None:
        return HttpResponse(f'Invalid state!', status=400)
    print(request.build_absolute_uri())
    token = auth.request_token(code, state)
    request.session['user'] = state
    users[state] = token
    return redirect('/')