Enhancement: support remote user auth directly against API (DRF) (#5386)

src/paperless/tests/test_remote_user.py

@@ -0,0 +1,75 @@
+import os
+from unittest import mock
+
+from django.contrib.auth.models import User
+from rest_framework import status
+from rest_framework.test import APITestCase
+
+from documents.tests.utils import DirectoriesMixin
+from paperless.settings import _parse_remote_user_settings
+
+
+class TestRemoteUser(DirectoriesMixin, APITestCase):
+    def setUp(self):
+        super().setUp()
+
+        self.user = User.objects.create_superuser(
+            username="temp_admin",
+        )
+
+    def test_remote_user(self):
+        """
+        GIVEN:
+            - Configured user
+            - Remote user auth is enabled
+        WHEN:
+            - API call is made to get documents
+        THEN:
+            - Call succeeds
+        """
+
+        with mock.patch.dict(
+            os.environ,
+            {
+                "PAPERLESS_ENABLE_HTTP_REMOTE_USER": "True",
+            },
+        ):
+            _parse_remote_user_settings()
+
+            response = self.client.get("/api/documents/")
+
+            # 403 testing locally, 401 on ci...
+            self.assertIn(
+                response.status_code,
+                [status.HTTP_401_UNAUTHORIZED, status.HTTP_403_FORBIDDEN],
+            )
+
+            response = self.client.get(
+                "/api/documents/",
+                headers={
+                    "Remote-User": self.user.username,
+                },
+            )
+
+            self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+    def test_remote_user_header_setting(self):
+        """
+        GIVEN:
+            - Remote user header name is set
+        WHEN:
+            - Settings are parsed
+        THEN:
+            - Correct header name is returned
+        """
+
+        with mock.patch.dict(
+            os.environ,
+            {
+                "PAPERLESS_ENABLE_HTTP_REMOTE_USER": "True",
+                "PAPERLESS_HTTP_REMOTE_USER_HEADER_NAME": "HTTP_FOO",
+            },
+        ):
+            header_name = _parse_remote_user_settings()
+
+            self.assertEqual(header_name, "HTTP_FOO")