Add a migrate browserview to migrate content to V3

src/kitconcept/voltolighttheme/browser/__init__.py

@@ -0,0 +1,56 @@
+from plone.protect.interfaces import IDisableCSRFProtection
+from plone.restapi.blocks import visit_blocks
+from Products.Five.browser import BrowserView
+from zope.interface import alsoProvides
+
+import logging
+import transaction
+
+
+logger = logging.getLogger("migrate_to_4")
+logger.setLevel(logging.INFO)
+
+# If you updated or extended the colors mappings, you should update this with the new values
+COLOR_MAP = {
+    "grey": {
+        "--background-color": "#ecebeb",
+    },
+    "transparent": {
+        "--background-color": "transparent",
+    },
+}
+
+
+def migrate_backgroundColor(portal):
+    i = 0
+    output = ""
+    for brain in portal.portal_catalog(
+        object_provides="plone.restapi.behaviors.IBlocks"
+    ):
+        obj = brain.getObject()
+        blocks = obj.blocks
+        output += f"Processing {obj.absolute_url()}\n"
+        for block in visit_blocks(obj, blocks):
+            if block.get("styles", False) and block["styles"].get(
+                "backgroundColor", False
+            ):
+                new_block = block.copy()
+                color = block["styles"]["backgroundColor"]
+                new_block["styles"]["backgroundColor:noprefix"] = COLOR_MAP[color]
+                del new_block["styles"]["backgroundColor"]
+                block.clear()
+                block.update(new_block)
+                output += f'{obj.absolute_url()} - Updated "backgroundColor" to "backgroundColor:noprefix"\n'
+
+        i += 1
+        if not i % 100:
+            logger.info(i)
+            transaction.commit()
+    transaction.commit()
+    return output
+
+
+class MigrateToV3(BrowserView):
+    def __call__(self):
+        alsoProvides(self.request, IDisableCSRFProtection)
+        return migrate_backgroundColor(self.context)

src/kitconcept/voltolighttheme/browser/configure.zcml

@@ -0,0 +1,17 @@
+<configure
+    xmlns="http://namespaces.zope.org/zope"
+    xmlns:browser="http://namespaces.zope.org/browser"
+    xmlns:plone="http://namespaces.plone.org/plone"
+    i18n_domain="dlr.internet"
+    >
+
+  <!-- Return all news item not located in /de/aktuelles/nachrichten and /en/latest -->
+
+  <browser:page
+      name="migratev3"
+      for="Products.CMFPlone.interfaces.IPloneSiteRoot"
+      class=".MigrateToV3"
+      permission="cmf.ManagePortal"
+      />
+
+</configure>

src/kitconcept/voltolighttheme/configure.zcml

@@ -18,6 +18,7 @@
   <include package=".serializers" />
   <include package=".indexers" />
   <include package=".vocabularies" />
+  <include package=".browser" />
 
   <include package="plone.volto.cors" />