add user_name, user_id, groups in userinfo

auth.py

@@ -282,6 +282,16 @@ class LDAPUserProxy(object):
             # Fail-safe.
             return True
 
+    @cached_property
+    def is_staff(self):
+        url = 'https://capacifier.hackerspace.pl/staff/{}'
+        try:
+            r = requests.get(url.format(self.username))
+            return 'YES' in r.text
+        except Exception as e:
+            logging.error("When getting data from Capacifier: {}".format(e))
+            return False
+
     def get_id(self):
         return self.username
 
@@ -358,8 +368,12 @@ def api_profile():
 @oauth.require_oauth('profile:read')
 def api_userinfo():
     user = LDAPUserProxy(flask.request.oauth.user)
+    groups = []
+    if user.is_staff:
+        groups.append('staff')
     return flask.jsonify(sub=user.username, name=user.gecos, email=user.email,
-                         preferred_username=user.username, nickname=user.username)
+                         preferred_username=user.username, nickname=user.username,
+                         user_name=user.username, user_id=user.username, groups=groups)
 
 
 if __name__ == '__main__':