[WEB - 1837]feat: page versioning (#5019)

* dev: create issue types and add back migration for existing issues

* dev: fix save

* dev: fix migration for issue types

* dev: create page version

* dev: add page versioning migrations

* dev: create page version endpoints

* dev: add is_default value in issue type

* dev: add start date and target date to project

* chore: updated migration

* dev: get issue_types

* fix: typo

* dev: update fetch ordering

---------

Co-authored-by: NarayanBavisetti <narayan3119@gmail.com>

apiserver/plane/app/views/page/base.py

@@ -38,6 +38,7 @@ from plane.db.models import (
 from ..base import BaseAPIView, BaseViewSet
 
 from plane.bgtasks.page_transaction_task import page_transaction
+from plane.bgtasks.page_version_task import page_version
 
 
 def unarchive_archive_page_and_descendants(page_id, archived_at):
@@ -481,16 +482,38 @@ class PagesDescriptionViewSet(BaseViewSet):
                 status=472,
             )
 
+        # Serialize the existing instance
+        existing_instance = json.dumps(
+            {
+                "description_html": page.description_html,
+            },
+            cls=DjangoJSONEncoder,
+        )
+
+        # Get the base64 data from the request
         base64_data = request.data.get("description_binary")
 
+        # If base64 data is provided
         if base64_data:
             # Decode the base64 data to bytes
             new_binary_data = base64.b64decode(base64_data)
-
+            # capture the page transaction
+            if request.data.get("description_html"):
+                page_transaction.delay(
+                    new_value=request.data,
+                    old_value=existing_instance,
+                    page_id=pk,
+                )
             # Store the updated binary data
             page.description_binary = new_binary_data
             page.description_html = request.data.get("description_html")
             page.save()
+            # Return a success response
+            page_version.delay(
+                page_id=page.id,
+                existing_instance=existing_instance,
+                user_id=request.user.id,
+            )
             return Response({"message": "Updated successfully"})
         else:
             return Response({"error": "No binary data provided"})

apiserver/plane/app/views/page/version.py

@@ -0,0 +1,37 @@
+# Third party imports
+from rest_framework import status
+from rest_framework.response import Response
+
+# Module imports
+from plane.db.models import PageVersion
+from ..base import BaseAPIView
+from plane.app.permissions import ProjectEntityPermission
+from plane.app.serializers import PageVersionSerializer
+
+
+class PageVersionEndpoint(BaseAPIView):
+
+    permission_classes = [
+        ProjectEntityPermission,
+    ]
+
+    def get(self, request, slug, project_id, page_id, pk=None):
+        # Check if pk is provided
+        if pk:
+            # Return a single page version
+            page_version = PageVersion.objects.get(
+                workspace__slug=slug,
+                page_id=page_id,
+                pk=pk,
+            )
+            # Serialize the page version
+            serializer = PageVersionSerializer(page_version)
+            return Response(serializer.data, status=status.HTTP_200_OK)
+        # Return all page versions
+        page_versions = PageVersion.objects.filter(
+            workspace__slug=slug,
+            page_id=page_id,
+        )
+        # Serialize the page versions
+        serializer = PageVersionSerializer(page_versions, many=True)
+        return Response(serializer.data, status=status.HTTP_200_OK)