[verified] add exam-board signed URL endpoint

(cherry picked from commit c65d18ca6b)

tests/test_exam_templates.py

@@ -143,6 +143,9 @@ class _FakeStorageAdmin:
     def download_file(self, bucket_id, file_path):
         return b"%PDF-1.7 fake"
 
+    def create_signed_url(self, bucket_id, file_path, expires_in=3600):
+        return {"signedURL": f"https://storage.test/{bucket_id}/{file_path}?token=fake&expires_in={expires_in}"}
+
 
 class _FakeServiceRoleClient:
     def __init__(self, store):
@@ -171,6 +174,65 @@ def test_requires_auth_when_not_overridden():
     assert resp.status_code in (401, 403)  # unauthenticated, not processed
 
 
+def test_catalogue_requires_auth_when_not_overridden():
+    app = FastAPI()
+    app.include_router(router, prefix="/api/exam")
+    resp = TestClient(app).get("/api/exam/catalogue")
+    assert resp.status_code in (401, 403)
+
+
+def test_list_catalogue_papers_uses_as_user_metadata():
+    store = {
+        "eb_exams": [
+            {"id": "e1", "exam_code": "AQA-1", "type_code": "QP", "storage_loc": "cc.examboards/aqa/p.pdf"},
+            {"id": "e2", "exam_code": "AQA-MS", "type_code": "MS", "storage_loc": "cc.examboards/aqa/ms.pdf"},
+        ]
+    }
+    client, _ = make_client(store=store)
+    resp = client.get("/api/exam/catalogue")
+    assert resp.status_code == 200
+    assert [p["id"] for p in resp.json()["papers"]] == ["e1"]
+
+
+def test_catalogue_signed_url_requires_auth_and_signs_examboard_pdf(monkeypatch):
+    store = {
+        "eb_exams": [
+            {"id": "e1", "exam_code": "AQA-1", "type_code": "QP", "storage_loc": "cc.examboards/aqa/physics/qp.pdf"},
+        ]
+    }
+    client, _ = make_client(store=store)
+    monkeypatch.setattr(templates_mod, "StorageAdmin", _FakeStorageAdmin)
+    resp = client.get("/api/exam/catalogue/e1/signed-url?expires_in=120")
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["bucket"] == "cc.examboards"
+    assert body["path"] == "aqa/physics/qp.pdf"
+    assert body["expires_in"] == 120
+    assert "token=fake" in body["signed_url"]
+
+
+def test_catalogue_signed_url_rejects_non_examboard_storage(monkeypatch):
+    store = {
+        "eb_exams": [
+            {"id": "e1", "exam_code": "AQA-1", "type_code": "QP", "storage_loc": "cc.public/aqa/physics/qp.pdf"},
+        ]
+    }
+    client, _ = make_client(store=store)
+    monkeypatch.setattr(templates_mod, "StorageAdmin", _FakeStorageAdmin)
+    assert client.get("/api/exam/catalogue/e1/signed-url").status_code == 404
+
+
+def test_catalogue_signed_url_rejects_non_catalogue_doc_type(monkeypatch):
+    store = {
+        "eb_exams": [
+            {"id": "e1", "exam_code": "AQA-MS", "type_code": "MS", "storage_loc": "cc.examboards/aqa/physics/ms.pdf"},
+        ]
+    }
+    client, _ = make_client(store=store)
+    monkeypatch.setattr(templates_mod, "StorageAdmin", _FakeStorageAdmin)
+    assert client.get("/api/exam/catalogue/e1/signed-url").status_code == 404
+
+
 def test_create_template_sets_owner_and_institute():
     client, store = make_client()
     resp = client.post("/api/exam/templates", json={"title": "AQA Physics 1H", "subject": "Physics"})