From 3bc73bcf9b521701742e9684bff316727bf457e5 Mon Sep 17 00:00:00 2001
From: SilviaAmAm <silvia@maykinmedia.nl>
Date: Fri, 8 Dec 2023 11:10:49 +0100
Subject: [PATCH 1/3] :adhesive_bandage: [#3649] Add bestandsomvang field

---
 src/openforms/contrib/zgw/clients/documenten.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/openforms/contrib/zgw/clients/documenten.py b/src/openforms/contrib/zgw/clients/documenten.py
index 3a2804a88a..41453f7356 100644
--- a/src/openforms/contrib/zgw/clients/documenten.py
+++ b/src/openforms/contrib/zgw/clients/documenten.py
@@ -32,7 +32,8 @@ def create_document(
     ):
         assert author, "author must be a non-empty string"
         today = get_today()
-        base64_body = b64encode(content.read()).decode()
+        file_content = content.read()
+        base64_body = b64encode(file_content).decode()
         data = {
             "informatieobjecttype": informatieobjecttype,
             "bronorganisatie": bronorganisatie,
@@ -46,6 +47,9 @@ def create_document(
             "bestandsnaam": filename,
             "beschrijving": description,
             "indicatieGebruiksrecht": False,
+            "bestandsomvang": (
+                content.size if hasattr(content, "size") else len(file_content)
+            ),
         }
 
         if vertrouwelijkheidaanduiding:

From 92088703de8cc049ce420a6346628406a18f0918 Mon Sep 17 00:00:00 2001
From: SilviaAmAm <silvia@maykinmedia.nl>
Date: Fri, 8 Dec 2023 15:00:31 +0100
Subject: [PATCH 2/3] :white_check_mark: [#3649] Add test

---
 .../contrib/zgw_apis/tests/test_backend.py    | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/src/openforms/registrations/contrib/zgw_apis/tests/test_backend.py b/src/openforms/registrations/contrib/zgw_apis/tests/test_backend.py
index d79f108cd9..ac27552757 100644
--- a/src/openforms/registrations/contrib/zgw_apis/tests/test_backend.py
+++ b/src/openforms/registrations/contrib/zgw_apis/tests/test_backend.py
@@ -1,3 +1,4 @@
+import json
 from decimal import Decimal
 
 from django.test import TestCase, override_settings, tag
@@ -1392,6 +1393,56 @@ def test_zgw_backend_has_reference_after_pre_submission(self, m):
         submission.refresh_from_db()
         self.assertEqual(submission.public_registration_reference, "ZAAK-OF-TEST")
 
+    @tag("gh-3649")
+    def test_document_size_argument_present(self, m):
+        submission = SubmissionFactory.from_components(
+            [
+                {
+                    "key": "field1",
+                    "type": "file",
+                },
+            ],
+        )
+        zgw_form_options = dict(
+            zgw_api_group=self.zgw_group,
+            zaaktype="https://catalogi.nl/api/v1/zaaktypen/1",
+            informatieobjecttype="https://catalogi.nl/api/v1/informatieobjecttypen/1",
+            organisatie_rsin="000000000",
+            zaak_vertrouwelijkheidaanduiding="openbaar",
+        )
+        SubmissionFileAttachmentFactory.create(
+            submission_step=SubmissionStep.objects.first(),
+            content__data=b"content",
+            file_name="attachment1.txt",
+            form_key="field1",
+            _component_configuration_path="components.0",
+        )
+
+        self.install_mocks(m)
+
+        plugin = ZGWRegistration("zgw")
+        plugin.pre_register_submission(submission, zgw_form_options)
+        plugin.register_submission(submission, zgw_form_options)
+
+        (
+            create_zaak,
+            create_pdf_document,
+            relate_pdf_document,
+            get_roltypen,
+            create_rol,
+            get_statustypen,
+            create_status,
+            create_attachment1_document,
+            relate_attachment1_document,
+        ) = m.request_history
+
+        self.assertIn("bestandsomvang", json.loads(create_pdf_document.body))
+
+        attachment_data = json.loads(create_attachment1_document.body)
+
+        self.assertIn("bestandsomvang", attachment_data)
+        self.assertEqual(attachment_data["bestandsomvang"], 7)
+
 
 @tag("gh-1183")
 @temp_private_root()

From ac3feec1386049acc8358017d3834c8ed806f92d Mon Sep 17 00:00:00 2001
From: SilviaAmAm <silvia@maykinmedia.nl>
Date: Fri, 8 Dec 2023 15:09:05 +0100
Subject: [PATCH 3/3] :memo: [#3649] Document compatibility with Documenten
 APIs

---
 docs/configuration/registration/zgw.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/configuration/registration/zgw.rst b/docs/configuration/registration/zgw.rst
index 3143a75795..bf57251d25 100644
--- a/docs/configuration/registration/zgw.rst
+++ b/docs/configuration/registration/zgw.rst
@@ -35,7 +35,7 @@ OAS                           URL to the OAS.
 Client ID                     Client ID for the JWT-token.
 Secret                        Secret for the JWT-token.
 **Documenten API**
-API root URL                  Root URL for the Documenten API that Open Forms can access.
+API root URL                  Root URL for the Documenten API (version 1.1+) that Open Forms can access.
 OAS                           URL to the OAS.
 Client ID                     Client ID for the JWT-token.
 Secret                        Secret for the JWT-token.
@@ -133,6 +133,6 @@ Technical
 API               Supported versions
 ================  ===================
 Zaken API         1.0
-Documenten API    1.0
+Documenten API    1.1+
 Catalogi API      1.0
 ================  ===================