Add endpoint to access block_types indexer

src/plone/volto/configure.zcml

@@ -15,6 +15,7 @@
   <include package=".behaviors" />
   <include package=".browser" />
   <include package=".indexers" />
+  <include package=".services" />
 
   <include file="profiles.zcml" />
   <include file="patches.zcml" />

src/plone/volto/indexers/indexers.py

@@ -4,6 +4,8 @@
 from plone.restapi.blocks import visit_blocks
 from plone.volto.behaviors.preview import IPreview
 
+import collections
+
 
 @indexer(IPreview)
 def hasPreviewImage(obj):
@@ -40,9 +42,9 @@ def image_field_indexer(obj):
 def block_types_indexer(obj):
     """Indexer for all block types included in a page."""
     obj = aq_base(obj)
-    block_types = set()
+    block_types = collections.Counter()
     for block in visit_blocks(obj, obj.blocks):
         block_type = block.get("@type")
         if block_type:
-            block_types.add(block_type)
+            block_types[block_type] += 1
     return block_types

src/plone/volto/profiles/default/catalog.xml

@@ -4,6 +4,7 @@
   <column value="head_title" />
   <column value="hasPreviewImage" />
   <column value="image_field" />
+  <column value="block_types" />
   <index meta_type="KeywordIndex"
          name="block_types"
   >

src/plone/volto/services/blocktypes/configure.zcml

@@ -0,0 +1,15 @@
+<configure
+    xmlns="http://namespaces.zope.org/zope"
+    xmlns:plone="http://namespaces.plone.org/plone"
+    xmlns:zcml="http://namespaces.zope.org/zcml"
+    >
+
+  <plone:service
+      method="GET"
+      factory=".get.BlockTypesGet"
+      for="zope.interface.Interface"
+      permission="zope2.View"
+      name="@blocktypes"
+      />
+
+</configure>

src/plone/volto/services/blocktypes/get.py

@@ -0,0 +1,44 @@
+from plone import api
+from plone.restapi.behaviors import IBlocks
+from plone.restapi.services import Service
+from zope.interface import implementer
+from zope.publisher.interfaces import IPublishTraverse
+
+
+@implementer(IPublishTraverse)
+class BlockTypesGet(Service):
+    def __init__(self, context, request):
+        super().__init__(context, request)
+        self.block_type = None
+
+    def publishTraverse(self, request, name):
+        self.block_type = name
+        return self
+
+    def reply(self):
+        catalog = api.portal.get_tool(name="portal_catalog")
+        request_body = self.request.form
+        result = {"items": []}
+        type = self.block_type
+
+        query = {
+            "object_provides": IBlocks.__identifier__,
+            "block_types": self.block_type,
+        }
+
+        if request_body.get("path"):
+            query["path"] = request_body["path"]
+
+        if type:
+            brains = catalog.unrestrictedSearchResults(**query)
+
+            for brain in brains:
+                result["items"].append(
+                    {
+                        "@id": brain.getURL(),
+                        "title": brain.Title,
+                        "count": brain.block_types[self.block_type],
+                    }
+                )
+
+        return result

src/plone/volto/services/configure.zcml

@@ -0,0 +1,8 @@
+<configure
+    xmlns="http://namespaces.zope.org/zope"
+    xmlns:zcml="http://namespaces.zope.org/zcml"
+    >
+
+  <include package=".blocktypes" />
+
+</configure>