Make likes and announces public.

lib/pleroma/web/activity_pub/utils.ex

@@ -109,6 +109,7 @@ def make_like_data(%User{ap_id: ap_id} = actor, %{data: %{"id" => id}} = object,
       "actor" => ap_id,
       "object" => id,
       "to" => [actor.follower_address, object.data["actor"]],
+      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
       "context" => object.data["context"]
     }
 
@@ -150,6 +151,7 @@ def make_follow_data(%User{ap_id: follower_id}, %User{ap_id: followed_id}, activ
       "type" => "Follow",
       "actor" => follower_id,
       "to" => [followed_id],
+      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
       "object" => followed_id
     }
 
@@ -177,6 +179,7 @@ def make_announce_data(%User{ap_id: ap_id} = user, %Object{data: %{"id" => id}}
       "actor" => ap_id,
       "object" => id,
       "to" => [user.follower_address, object.data["actor"]],
+      "cc" => ["https://www.w3.org/ns/activitystreams#Public"],
       "context" => object.data["context"]
     }
 

test/web/ostatus/activity_representer_test.exs

@@ -121,6 +121,7 @@ test "an announce activity" do
       #{note_xml}
     </activity:object>
     <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/person" href="#{note.data["actor"]}"/>
+    <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/collection" href="http://activityschema.org/collection/public"/>
     """
 
     announce_xml = ActivityRepresenter.to_simple_form(announce, user)
@@ -156,6 +157,7 @@ test "a like activity" do
     <link rel="self" type="application/atom+xml" href="#{like.data["id"]}"/>
     <thr:in-reply-to ref="#{note.data["id"]}" />
     <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/person" href="#{note.data["actor"]}"/>
+    <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/collection" href="http://activityschema.org/collection/public"/>
     """
 
     assert clean(res) == clean(expected)