MSRS/oauth/views.py

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2021-04-18 20:58:18 +02:00
import logging
import requests
from django.conf import settings
from django.contrib.auth import login
from django.http.request import HttpRequest
from django.shortcuts import redirect, render
import users
from users.models import CustomUser
logger = logging.getLogger(__file__)
class OAuthException(Exception):
pass
def register(_):
RESPONSE_TYPE = 'code'
return redirect(f'{settings.OAUTH["AUTHORIZE_URI"]}?'
f'response_type={RESPONSE_TYPE}&'
f'client_id={settings.OAUTH["CLIENT_ID"]}&'
f'redirect_uri={settings.OAUTH["REDIRECT_URI"]}')
def register_callback(req: HttpRequest):
if 'code' not in req.GET or 'error' in req.GET:
error = req.GET['error'] if 'error' in req.GET else None
return login_fail(req, error)
try:
access_token = get_access_token(req.GET['code'])
user_info = get_user_info(access_token)
logger.debug(f'Succesfully authenticated user: {user_info["username"]} with id: {user_info["id"]}')
validated_user = validate_user(user_info['id'], user_info['username'])
login(req, validated_user)
return redirect('/')
except OAuthException as e:
logger.error(e)
return login_fail(req, str(e))
def login_fail(request, error: str = None):
return render(request, "oauth/failed.html", {'error': error})
def validate_user(zeus_id, username) -> CustomUser:
try:
user = CustomUser.objects.get(zeus_id=zeus_id)
user.username = username
user.save()
return user
except users.models.CustomUser.DoesNotExist:
return CustomUser.objects.create_user(zeus_id, username)
def get_access_token(code):
response = requests.post(
settings.OAUTH["ACCESS_TOKEN_URI"],
data={'code': code,
'grant_type': 'authorization_code',
'client_id': settings.OAUTH["CLIENT_ID"],
'client_secret': settings.OAUTH["CLIENT_SECRET"],
'redirect_uri': settings.OAUTH["REDIRECT_URI"]})
if response.status_code != 200:
raise OAuthException(
f'Status code {response.status_code} when requesting access token.\nresponse: {response.text}')
if 'access_token' not in response.json():
raise OAuthException('Got status code 200 but no access_token')
return response.json()['access_token']
def get_user_info(access_token):
response = requests.get(
settings.OAUTH["USER_API_URI"],
headers={'Authorization': f'Bearer {access_token}'},
)
if response.status_code != 200:
raise OAuthException(
f'Status code {response.status_code} when requesting user info.\nresponse: {response.text}')
if 'username' not in response.json() or 'id' not in response.json():
raise OAuthException(f'username and id are expected values: {response.json()}')
return response.json()