✨(backend) allow uploading images as attachments to a document

We only rely on S3 to store attachments for a document. Nothing
is persisted in the database as the image media urls will be
stored in the document json.

src/backend/core/tests/documents/test_api_documents_attachment_upload.py

@@ -0,0 +1,199 @@
+"""
+Test file uploads API endpoint for users in impress's core app.
+"""
+
+import re
+import uuid
+
+from django.core.files.base import ContentFile
+from django.core.files.uploadedfile import SimpleUploadedFile
+
+import pytest
+from rest_framework.test import APIClient
+
+from core import factories
+from core.tests.conftest import TEAM, USER, VIA
+
+pytestmark = pytest.mark.django_db
+
+
+def test_api_documents_attachment_upload_anonymous():
+    """Anonymous users can't upload attachments to a document."""
+    document = factories.DocumentFactory()
+    file = SimpleUploadedFile("test_file.jpg", b"Dummy content")
+
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+    response = APIClient().post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 401
+    assert response.json() == {
+        "detail": "Authentication credentials were not provided."
+    }
+
+
+def test_api_documents_attachment_upload_authenticated_public():
+    """
+    Users who are not related to a public document should not be allowed to upload an attachment.
+    """
+    user = factories.UserFactory()
+
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory(is_public=True)
+    file = SimpleUploadedFile("test_file.jpg", b"Dummy content")
+
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+    response = client.post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 403
+    assert response.json() == {
+        "detail": "You do not have permission to perform this action."
+    }
+
+
+def test_api_documents_attachment_upload_authenticated_private():
+    """
+    Users who are not related to a private document should not be able to upload an attachment.
+    """
+    user = factories.UserFactory()
+
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory(is_public=False)
+    file = SimpleUploadedFile("test_file.jpg", b"Dummy content")
+
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+    response = client.post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 404
+    assert response.json() == {"detail": "No Document matches the given query."}
+
+
+@pytest.mark.parametrize("via", VIA)
+def test_api_documents_attachment_upload_reader(via, mock_user_get_teams):
+    """
+    Users who are simple readers on a document should not be allowed to upload an attachment.
+    """
+    user = factories.UserFactory()
+
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory()
+    if via == USER:
+        factories.UserDocumentAccessFactory(document=document, user=user, role="reader")
+    elif via == TEAM:
+        mock_user_get_teams.return_value = ["lasuite", "unknown"]
+        factories.TeamDocumentAccessFactory(
+            document=document, team="lasuite", role="reader"
+        )
+
+    file = SimpleUploadedFile("test_file.jpg", b"Dummy content")
+
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+    response = client.post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 403
+    assert response.json() == {
+        "detail": "You do not have permission to perform this action."
+    }
+
+
+@pytest.mark.parametrize("role", ["editor", "administrator", "owner"])
+@pytest.mark.parametrize("via", VIA)
+def test_api_documents_attachment_upload_success(
+    via, role, mock_user_get_teams, settings
+):
+    """
+    Editors, administrators and owners of a document should be able to upload an attachment.
+    """
+    user = factories.UserFactory()
+
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory()
+    if via == USER:
+        factories.UserDocumentAccessFactory(document=document, user=user, role=role)
+    elif via == TEAM:
+        mock_user_get_teams.return_value = ["lasuite", "unknown"]
+        factories.TeamDocumentAccessFactory(
+            document=document, team="lasuite", role=role
+        )
+
+    file = SimpleUploadedFile("test_file.jpg", b"Dummy content")
+
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+    response = client.post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 201
+
+    pattern = re.compile(rf"^{settings.MEDIA_URL}{document.id!s}/attachments/(.*)\.jpg")
+    match = pattern.search(response.json()["file"])
+    file_id = match.group(1)
+
+    # Validate that file_id is a valid UUID
+    uuid.UUID(file_id)
+
+
+def test_api_documents_attachment_upload_invalid(client):
+    """Attempt to upload without a file should return an explicit error."""
+    user = factories.UserFactory()
+
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory(users=[(user, "owner")])
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+
+    response = client.post(url, {}, format="multipart")
+
+    assert response.status_code == 400
+    assert response.json() == {"file": ["No file was submitted."]}
+
+
+def test_api_documents_attachment_upload_size_limit_exceeded(settings):
+    """The uploaded file should not exceeed the maximum size in settings."""
+    settings.DOCUMENT_IMAGE_MAX_SIZE = 1048576  # 1 MB for test
+
+    user = factories.UserFactory()
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory(users=[(user, "owner")])
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+
+    # Create a temporary file larger than the allowed size
+    content = b"a" * (1048576 + 1)
+    file = ContentFile(content, name="test.jpg")
+
+    response = client.post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 400
+    assert response.json() == {"file": ["File size exceeds the maximum limit of 1 MB."]}
+
+
+def test_api_documents_attachment_upload_type_not_allowed(settings):
+    """The uploaded file should be of a whitelisted type."""
+    settings.DOCUMENT_IMAGE_ALLOWED_MIME_TYPES = ["image/jpeg", "image/png"]
+
+    user = factories.UserFactory()
+    client = APIClient()
+    client.force_login(user)
+
+    document = factories.DocumentFactory(users=[(user, "owner")])
+    url = f"/api/v1.0/documents/{document.id!s}/attachment-upload/"
+
+    # Create a temporary file with a not allowed type (e.g., text file)
+    file = ContentFile(b"a" * 1048576, name="test.txt")
+
+    response = client.post(url, {"file": file}, format="multipart")
+
+    assert response.status_code == 400
+    assert response.json() == {
+        "file": [
+            "File type 'text/plain' is not allowed. Allowed types are: image/jpeg, image/png"
+        ]
+    }

src/backend/core/tests/documents/test_api_documents_retrieve.py

@@ -22,6 +22,7 @@ def test_api_documents_retrieve_anonymous_public():
         "id": str(document.id),
         "abilities": {
             "destroy": False,
+            "attachment_upload": False,
             "manage_accesses": False,
             "partial_update": False,
             "retrieve": True,
@@ -69,6 +70,7 @@ def test_api_documents_retrieve_authenticated_unrelated_public():
         "id": str(document.id),
         "abilities": {
             "destroy": False,
+            "attachment_upload": False,
             "manage_accesses": False,
             "partial_update": False,
             "retrieve": True,