add oauth basic

KeRS/settings.py

@@ -32,7 +32,8 @@ ALLOWED_HOSTS = []
 
 OWN_APPS = [
     'events',
-    'users'
+    'users',
+    'oauth',
 ]
 
 INSTALLED_APPS = [

KeRS/urls.py

@@ -19,4 +19,5 @@ from django.urls import path, include
 urlpatterns = [
     path('events/', include('events.urls')),
     path('admin/', admin.site.urls),
+    path('login/zeus/', include('oauth.urls')),
 ]

oauth/urls.py

@@ -0,0 +1,8 @@
+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path('register', views.register),
+    path('authorized', views.register_callback),
+]

oauth/views.py

@@ -0,0 +1,53 @@
+import logging
+
+from django.shortcuts import redirect
+from django.http.request import HttpRequest
+import requests
+
+USER_API_URI = 'https://adams.ugent.be/oauth/api/current_user/'
+ACCESS_TOKEN_URI = 'https://adams.ugent.be/oauth/oauth2/token/'
+AUTHORIZE_URI = 'https://adams.ugent.be/oauth/oauth2/authorize/'
+
+CLIENT_ID = 'tomtest'
+CLIENT_SECRET = 'blargh'
+
+logger = logging.getLogger(__file__)
+
+class OAuthException(Exception):
+    pass
+
+
+def register(_):
+    RESPONSE_TYPE = 'code'
+    REDIRECT_URI = 'http://localhost:8000/login/zeus/authorized'
+    return redirect(f'{AUTHORIZE_URI}?response_type={RESPONSE_TYPE}&client_id={CLIENT_ID}&redirect_uri={REDIRECT_URI}')
+
+
+def register_callback(req: HttpRequest):
+    code = req.GET['code']
+    response = requests.post(ACCESS_TOKEN_URI, data={'code': code,
+                                                     'grant_type': 'authorization_code',
+                                                     'client_id': CLIENT_ID,
+                                                     'client_secret': CLIENT_SECRET,
+                                                     'redirect_uri': 'http://localhost:8000/login/zeus/authorized'})
+    try:
+        if response.status_code == 200:
+            json: dict = response.json()
+            # TODO: maybe later do something with the refresh token.
+            user: dict = user_info(json['access_token'])
+            if 'username' not in user.keys() or 'id' not in user.keys():
+                raise OAuthException(f'username and id are expected values: {user}')
+            else:
+                logger.debug(f'Succesfully authenticated user: {user["username"]} with id: {user["id"]}')
+                pass
+        else:
+            raise OAuthException(f'Status code not 200, response: {response.json()}')
+    except OAuthException as e:
+        logger.error(e)
+
+    return register('')
+
+
+def user_info(access_token):
+    r = requests.get(USER_API_URI, headers={'Authorization': f'Bearer {access_token}'})
+    return r.json()