Enable filtering users by public primary key (#3339)

Related to https://github.com/grafana/oncall/issues/3164

This will allow the following request to check if a user is currently
on-call:
`GET
/api/internal/v1/users/?search=UCGEIXI1MR1NZ&is_currently_oncall=true`

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Added user timezone field to the users public API response ([#3311](https://github.com/grafana/oncall/pull/3311))
+- Allow filtering users by public primary key in internal API ([#3339](https://github.com/grafana/oncall/pull/3339))
 
 ### Changed
 

engine/apps/api/tests/test_user.py

@@ -262,6 +262,31 @@ def test_list_users_filtered_by_granted_permission(
     assert user3.public_primary_key not in returned_user_pks
 
 
+@pytest.mark.django_db
+def test_list_users_filtered_by_public_primary_key(
+    make_organization,
+    make_user_for_organization,
+    make_token_for_organization,
+    make_user_auth_headers,
+):
+    organization = make_organization()
+    admin_user = make_user_for_organization(organization)
+    user1 = make_user_for_organization(organization)
+    make_user_for_organization(organization)
+    _, token = make_token_for_organization(organization)
+
+    client = APIClient()
+    url = reverse("api-internal:user-list")
+
+    response = client.get(
+        f"{url}?search={user1.public_primary_key}", format="json", **make_user_auth_headers(admin_user, token)
+    )
+
+    assert response.status_code == status.HTTP_200_OK
+    returned_user_pks = [u["pk"] for u in response.json()["results"]]
+    assert returned_user_pks == [user1.public_primary_key]
+
+
 @pytest.mark.django_db
 def test_notification_chain_verbal(
     make_organization,

engine/apps/api/views/user.py

@@ -222,6 +222,7 @@ class UserView(
         "^slack_user_identity__cached_slack_login",
         "^slack_user_identity__cached_name",
         "^teams__name",
+        "=public_primary_key",
     )
 
     filterset_class = UserFilter