# OAuth Token removal

* adds deletion of oauth token stored on konova db on user logout

.env.sample

@@ -35,7 +35,6 @@ SCHNEIDER_AUTH_HEADER=auth
 
 # SSO
 SSO_SERVER_BASE_URL=https://login.naturschutz.rlp.de
-OAUTH_CODE_VERIFIER=CHANGE_ME
 OAUTH_CLIENT_ID=CHANGE_ME
 OAUTH_CLIENT_SECRET=CHANGE_ME
 PROPAGATION_SECRET=CHANGE_ME

api/models/token.py

@@ -1,7 +1,9 @@
+import datetime
 import json
 from datetime import timedelta
 
 import requests
+from authlib.oauth2.rfc6749 import OAuth2Token
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import models
 from django.utils import timezone
@@ -78,27 +80,25 @@ class OAuthToken(UuidModel):
         return str(self.access_token)
 
     @staticmethod
-    def from_access_token_response(access_token_data: str, received_on):
+    def create_from_oauth2_token(oauth2_token: OAuth2Token):
         """
         Creates an OAuthToken based on retrieved access token data (OAuth2.0 specification)
 
         Args:
-            access_token_data (str): OAuth2.0 response data
-            received_on (): Timestamp when the response has been received
+            oauth2_token (str): OAuth2.0 response data
 
         Returns:
 
         """
         oauth_token = OAuthToken()
-        data = json.loads(access_token_data)
 
-        oauth_token.access_token = data.get("access_token")
-        oauth_token.refresh_token = data.get("refresh_token")
+        oauth_token.access_token = oauth2_token.get("access_token")
+        oauth_token.refresh_token = oauth2_token.get("refresh_token")
+        oauth_token.expires_on = datetime.datetime.fromtimestamp(oauth2_token.get("expires_at"))
 
-        expires_on = received_on + timedelta(
-            seconds=(data.get("expires_in") + OAuthToken.ASSUMED_LATENCY)
-        )
-        oauth_token.expires_on = expires_on
+        assert (oauth_token.access_token is not None and
+                oauth_token.refresh_token is not None and
+                oauth_token.expires_on is not None)
 
         return oauth_token
 
@@ -155,25 +155,34 @@ class OAuthToken(UuidModel):
 
         return user
 
-    def revoke(self) -> int:
+    def revoke(self) -> None:
         """ Revokes the OAuth2 token of the user
 
         (/o/revoke_token/ indeed removes the corresponding access token on provider side and invalidates the
         submitted refresh token in one step)
 
         Returns:
-            revocation_status_code (int): HTTP status code for revocation of refresh_token
+
         """
         revoke_url = f"{SSO_SERVER_BASE}o/revoke_token/"
-        token = self.refresh_token
-        revocation_status_code = requests.post(
-                revoke_url,
-                data={
-                    'token': token,
-                    'token_type_hint': "refresh_token",
-                },
-                auth=(OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET),
-            ).status_code
+        token_types = [
+            (self.refresh_token, "refresh_token"),
+            (self.access_token, "access_token"),
+        ]
+        status_codes = []
+        for entry in token_types:
+            status_codes.append(
+                requests.post(
+                    revoke_url,
+                    data={
+                        'token': entry[0],
+                        'token_type_hint': entry[1],
+                    },
+                    auth=(OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET),
+                ).status_code
+            )
+
+        assert len(status_codes) == 2
+        assert status_codes[0] == 200 and status_codes[1] == 200
 
-        return revocation_status_code
 

konova/sub_settings/sso_settings.py

@@ -12,8 +12,6 @@ SSO_SERVER_BASE = env("SSO_SERVER_BASE_URL")
 SSO_SERVER = f"{SSO_SERVER_BASE}sso/"
 
 # OAuth settings
-OAUTH_CODE_VERIFIER = env("OAUTH_CODE_VERIFIER")
-
 OAUTH_CLIENT_ID = env("OAUTH_CLIENT_ID")
 OAUTH_CLIENT_SECRET = env("OAUTH_CLIENT_SECRET")
 

konova/utils/generators.py

@@ -8,6 +8,9 @@ Created on: 09.11.20
 import secrets
 import string
 
+from authlib.common.security import generate_token as authlib_generate_token
+
+
 
 def generate_token(length: int = 64) -> str:
     """ Shortcut for default generating of e.g. API token
@@ -15,11 +18,7 @@ def generate_token(length: int = 64) -> str:
     Returns:
         token (str)
     """
-    return generate_random_string(
-        length=length,
-        use_numbers=True,
-        use_letters_lc=True
-    )
+    return authlib_generate_token(length)
 
 
 def generate_random_string(length: int, use_numbers: bool = False, use_letters_lc: bool = False, use_letters_uc: bool = False) -> str:

konova/utils/geometry/geometry_validator.py

@@ -180,6 +180,24 @@ class GeometryProcessor:
         is_area_valid = geom.area > 1  # > 1m² (SRID:25832)
         return is_area_valid
 
+    @staticmethod
+    def is_valid_geometry(geom: gdal.OGRGeometry) -> bool:
+        """ Checks whether the geometry is technically valid
+
+        Args:
+            geom (OGRGeometry): The geom
+
+        Returns:
+
+        """
+        try:
+            # Check geometry validity by triggering some low cost processing like centroid calculation
+            geom.centroid
+            geom.boundary
+            return True
+        except gdal.GDALException as e:
+            return False
+
 
 class GeoJsonValidator:
     """ GeoJson Validator validates geojson (e.g. from API or form input)
@@ -257,10 +275,10 @@ class GeoJsonValidator:
         Returns:
 
         """
-        features = self._input_geojson.get("features", None)
+        features = self._input_geojson.get("features", [])
 
         is_input_geojson_empty = len(self._input_geojson) == 0
-        no_features_in_input_found = features is None
+        no_features_in_input_found = len(features) == 0
 
         if not is_input_geojson_empty and no_features_in_input_found:
             # check if _input_geojson is a feature itself
@@ -273,7 +291,6 @@ class GeoJsonValidator:
             else:
                 self.__add_error("Input does not seem to be geojson")
                 return
-
         try:
             validated_features = self.__validate_single_features(features)
         except AssertionError as e:
@@ -306,6 +323,10 @@ class GeoJsonValidator:
             g = gdal.OGRGeometry(feature_geom, srs=self._srs)
             if g.empty:
                 continue
+
+            if not GeometryProcessor.is_valid_geometry(g):
+                raise AssertionError(_("This feature holds malicious parts and can not be processed!"))
+
             g = GeometryProcessor.cast_to_rlp_srid(g)
             if not GeometryProcessor.is_valid_25832(g):
                 raise AssertionError(_("This feature does not hold valid EPSG:25832 coordinates:\n {}".format(g.geojson)))

konova/views/logout.py

@@ -29,6 +29,7 @@ class LogoutView(View):
             oauth_token = user.oauth_token
             if oauth_token:
                 oauth_token.revoke()
+                oauth_token.delete()
         except AttributeError:
             pass
 

konova/views/oauth.py

@@ -7,33 +7,52 @@ Created on: 26.04.24
 """
 import base64
 import hashlib
-from urllib.parse import urlencode
 
-import requests
+from authlib.common.security import generate_token
+from authlib.integrations.base_client import OAuthError
+from authlib.integrations.django_client import OAuth
+
 from django.contrib.auth import login
-from django.http import HttpRequest
+from django.http import HttpRequest, HttpResponse
 from django.shortcuts import redirect
 from django.urls import reverse
-from django.utils.timezone import now
 from django.views import View
 
 from api.models import OAuthToken
 from konova.sub_settings.django_settings import BASE_URL
-from konova.sub_settings.sso_settings import SSO_SERVER_BASE, OAUTH_CODE_VERIFIER, OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET
+from konova.sub_settings.sso_settings import SSO_SERVER_BASE, OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET
 
 
+
+_OAUTH = OAuth()
+_OAUTH.register(
+    name="sso",
+    client_id=OAUTH_CLIENT_ID,
+    client_secret=OAUTH_CLIENT_SECRET,
+    authorize_url=f"{SSO_SERVER_BASE}o/authorize/",
+    access_token_url=f"{SSO_SERVER_BASE}o/token/",
+    code_challenge_method="S256",
+    client_kwargs={},
+)
+
 class OAuthLoginView(View):
-    """
-    Starts OAuth Login procedure
-        -> AnonymousUser is redirected to SSO component using specific parameters
-        -> After successful login (in SSO component), user will be redirected to a specific callback url (OAuthCallbackView)
-        -> Callback view uses retrieved authorization token to get a proper access token from SSO component
-        -> SSO component answers with access token
-        -> OAuthCallbackView uses token in Authorization header to access user data of logged-in user in SSO component
-        -> OAuthCallbackView creates/updates user
-        -> OAuthCallbackView logs in user and redirects to default home view
+    """ View for OAuth2 login step
 
     """
+    def get(self, request: HttpRequest, *args, **kwargs):
+        redirect_uri = f'{BASE_URL}{reverse("oauth-callback")}'
+
+        # create new PKCE-Verifier
+        code_verifier, code_challenge = self.__create_code_challenge()
+
+        # keep verifier in session, so it can be read out for callback
+        request.session["oauth_code_verifier"] = code_verifier
+
+        return _OAUTH.sso.authorize_redirect(
+            request,
+            redirect_uri,
+            code_verifier=code_verifier,
+        )
 
     def __create_code_challenge(self):
         """
@@ -44,82 +63,49 @@ class OAuthLoginView(View):
         Returns:
 
         """
-        code_verifier = OAUTH_CODE_VERIFIER
+        code_verifier = generate_token(128)
 
         code_challenge = hashlib.sha256(code_verifier.encode('utf-8')).digest()
         code_challenge = base64.urlsafe_b64encode(code_challenge).decode('utf-8').replace('=', '')
         return code_verifier, code_challenge
 
-    def get(self, request: HttpRequest, *args, **kwargs):
-        """
-        Redirects user to OAuth SSO webservice for credential based login there
-
-        Args:
-            request ():
-            *args ():
-            **kwargs ():
-
-        Returns:
-
-        """
-        oauth_authentication_code_url = f"{SSO_SERVER_BASE}o/authorize/"
-        redirect_uri = f'{BASE_URL}{reverse("oauth-callback")}'
-
-        code_verifier, code_challenge = self.__create_code_challenge()
-
-        urlencode_params = urlencode(
-            {
-                "response_type": "code",
-                "code_challenge": code_challenge,
-                "code_challenge_method": "S256",
-                "client_id": OAUTH_CLIENT_ID,
-                "redirect_uri": redirect_uri,
-            }
-        )
-        url = f"{oauth_authentication_code_url}?{urlencode_params}"
-        return redirect(url)
-
-
 class OAuthCallbackView(View):
-    """
-    Callback view for OAuth2.0 authentication token.
-    Authentication tokens will be exchanged for access token.
-    Access Token will be used for fetching user data from SSO component.
-    User data will be used for creating/updating user data inside this app.
-    User will be logged-in and redirected to default home view.
+    """ View for OAuth2 callback step
 
     """
-
     def get(self, request: HttpRequest, *args, **kwargs):
-        authentication_code = request.GET.get("code")
-        oauth_acces_token_url = f"{SSO_SERVER_BASE}o/token/"
-
-        callback_url = f'{BASE_URL}{reverse("oauth-callback")}'
-
-        params = {
-            "grant_type": "authorization_code",
-            "code": authentication_code,
-            "redirect_uri": callback_url,
-            "code_verifier": OAUTH_CODE_VERIFIER,
-            "client_id": OAUTH_CLIENT_ID,
-            "client_secret": OAUTH_CLIENT_SECRET
-        }
-        access_code_response = requests.post(
-            oauth_acces_token_url,
-            data=params
+        # Get code verifier (created on oatuh-login step) from session
+        code_verifier = request.session.pop(
+            "oauth_code_verifier",
+            None,
         )
-        received_on = now()
+        if not code_verifier:
+            return HttpResponse(
+                "PKCE code_verifier missing or is invalid.",
+                status=400,
+            )
 
-        access_code_response_body = access_code_response.content.decode("utf-8")
-        status_code_invalid = access_code_response.status_code != 200
-        if status_code_invalid:
-            raise RuntimeError(f"OAuth access token could not be fetched: {access_code_response.text}")
+        try:
+            token = _OAUTH.sso.authorize_access_token(
+                request
+            )
+        except OAuthError as e:
+            print(e)
+            return HttpResponse(
+                "OAuth-Login failed while authorizing with OAuth.",
+                status=400,
+            )
+        try:
+            oauth_token = OAuthToken.create_from_oauth2_token(token)
+        except AssertionError:
+            return HttpResponse(
+                "OAuth-Login failed due to unexpected token content.",
+                status=400,
+            )
 
-        oauth_token = OAuthToken.from_access_token_response(access_code_response_body, received_on)
         oauth_token.save()
         user = oauth_token.update_and_get_user()
         user.oauth_replace_token(oauth_token)
 
         login(request, user)
         return redirect("home")
-

locale/de/LC_MESSAGES/django.po

@@ -45,7 +45,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2026-09-13 12:06+0200\n"
+"POT-Creation-Date: 2026-09-17 16:25+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -2012,7 +2012,11 @@ msgstr "In Zwischenablage kopiert"
 msgid "Search"
 msgstr "Suchen"
 
-#: konova/utils/geometry/geometry_validator.py:311
+#: konova/utils/geometry/geometry_validator.py:328
+msgid "This feature holds malicious parts and can not be processed!"
+msgstr "Teile der Geometrie sind ungültig und können nicht verarbeitet werden!"
+
+#: konova/utils/geometry/geometry_validator.py:332
 msgid ""
 "This feature does not hold valid EPSG:25832 coordinates:\n"
 " {}"
@@ -2020,7 +2024,7 @@ msgstr ""
 "Dieses Feature enthält keine validen EPSG:25832 Koordinaten:\n"
 " {}"
 
-#: konova/utils/geometry/geometry_validator.py:319
+#: konova/utils/geometry/geometry_validator.py:340
 msgid "Only surfaces allowed. Points or lines must be buffered."
 msgstr ""
 "Nur Flächen erlaubt. Punkte oder Linien müssen zu Flächen gepuffert werden."

requirements.txt

@@ -1,6 +1,7 @@
 amqp==5.3.1
 asgiref==3.12.1
 async-timeout==5.0.1
+Authlib==1.8.0
 beautifulsoup4==4.15.0
 billiard==4.2.4
 cached-property==2.0.1
@@ -30,6 +31,7 @@ gunicorn==26.2.0
 idna==3.19
 importlib_metadata==9.0.1
 itsdangerous==2.2.0
+joserfc==1.7.5
 jwcrypto==1.6.0
 kombu==5.6.2
 oauthlib==3.3.1