api: add v3

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/api/v3/sentry.py

@@ -0,0 +1,66 @@
+"""Sentry tunnel"""
+from json import loads
+
+from django.conf import settings
+from django.http.request import HttpRequest
+from django.http.response import HttpResponse
+from requests import post
+from requests.exceptions import RequestException
+from rest_framework.authentication import SessionAuthentication
+from rest_framework.parsers import BaseParser
+from rest_framework.permissions import AllowAny
+from rest_framework.request import Request
+from rest_framework.throttling import AnonRateThrottle
+from rest_framework.views import APIView
+
+from authentik.lib.config import CONFIG
+
+
+class PlainTextParser(BaseParser):
+    """Plain text parser."""
+
+    media_type = "text/plain"
+
+    def parse(self, stream, media_type=None, parser_context=None) -> str:
+        """Simply return a string representing the body of the request."""
+        return stream.read()
+
+
+class CsrfExemptSessionAuthentication(SessionAuthentication):
+    """CSRF-exempt Session authentication"""
+
+    def enforce_csrf(self, request: Request):
+        return  # To not perform the csrf check previously happening
+
+
+class SentryTunnelView(APIView):
+    """Sentry tunnel, to prevent ad blockers from blocking sentry"""
+
+    serializer_class = None
+    parser_classes = [PlainTextParser]
+    throttle_classes = [AnonRateThrottle]
+    permission_classes = [AllowAny]
+    authentication_classes = [CsrfExemptSessionAuthentication]
+
+    def post(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
+        """Sentry tunnel, to prevent ad blockers from blocking sentry"""
+        # Only allow usage of this endpoint when error reporting is enabled
+        if not CONFIG.y_bool("error_reporting.enabled", False):
+            return HttpResponse(status=400)
+        # Body is 2 json objects separated by \n
+        full_body = request.body
+        header = loads(full_body.splitlines()[0])
+        # Check that the DSN is what we expect
+        dsn = header.get("dsn", "")
+        if dsn != settings.SENTRY_DSN:
+            return HttpResponse(status=400)
+        response = post(
+            "https://sentry.beryju.org/api/8/envelope/",
+            data=full_body,
+            headers={"Content-Type": "application/octet-stream"},
+        )
+        try:
+            response.raise_for_status()
+        except RequestException:
+            return HttpResponse(status=500)
+        return HttpResponse(status=response.status_code)