fix: invalid certificate uuid should raise 404 (#2990)

* fix: invalid certificate uuid should raise 404

* fix: fix length certificate uuid regex match

* test: rewrite tests

cms/models.py

@@ -639,7 +639,7 @@ def can_create_at(cls, parent):
             and not parent.get_children().type(cls).exists()
         )
 
-    @route(r"^program/([A-Fa-f0-9-]+)/?$")
+    @route(r"^program/([A-Fa-f0-9-]{36})/?$")
     def program_certificate(
         self,
         request,
@@ -677,7 +677,7 @@ def program_certificate(
         certificate_page.certificate = certificate
         return certificate_page.serve(request)
 
-    @route(r"^([A-Fa-f0-9-]+)/?$")
+    @route(r"^([A-Fa-f0-9-]{36})/?$")
     def course_certificate(
         self,
         request,

cms/models_test.py

@@ -64,7 +64,12 @@
     UserTestimonialsPage,
     WhoShouldEnrollPage,
 )
-from courses.factories import CourseFactory, CourseRunFactory
+from courses.factories import (
+    CourseFactory,
+    CourseRunCertificateFactory,
+    CourseRunFactory,
+    ProgramCertificateFactory,
+)
 
 pytestmark = [pytest.mark.django_db]
 
@@ -1785,3 +1790,32 @@ def test_program_page_price_is_updated(superuser_client):
     resp = superuser_client.post(path, data_to_post)
     assert resp.status_code == 302
     assert program.current_price == 999
+
+
+def test_certificate_request_with_valid_uuid(user_client):
+    """Test that certificate request is successful for course and program certificates."""
+    course_run_certificate = CourseRunCertificateFactory.create()
+    resp = user_client.get(f"/certificate/{course_run_certificate.uuid}/")
+    assert resp.status_code == 200
+
+    program_certificate = ProgramCertificateFactory.create()
+    resp = user_client.get(f"/certificate/program/{program_certificate.uuid}/")
+    assert resp.status_code == 200
+
+
+@pytest.mark.parametrize(
+    "uuid_string",
+    [
+        "",
+        "1bebd843-ebf0-40c0-850e",
+        "1bebd843-ebf0-40c0-850e-fe73baa31b944444",
+        "1bebd843-ebf0-40c0-850e-fe73baa31b94-4ab4",
+    ],
+)
+def test_certificate_request_with_invalid_uuid(user_client, uuid_string):
+    """Test that course run and program certificate request returns a 404 for invalid uuids."""
+    program_certificate_resp = user_client.get(f"/certificate/program/{uuid_string}/")
+    assert program_certificate_resp.status_code == 404
+
+    course_certificate_resp = user_client.get(f"/certificate/{uuid_string}/")
+    assert course_certificate_resp.status_code == 404