Add post action creator

lib/email/receiver.rb

@@ -1,5 +1,6 @@
 require_dependency 'new_post_manager'
 require_dependency 'email/html_cleaner'
+require_dependency 'post_action_creator'
 
 module Email
 
@@ -245,7 +246,7 @@ module Email
     end
 
     def create_post_action(email_log, type)
-      PostAction.act(email_log.user, email_log.post, type)
+      PostActionCreator.new(email_log.user, email_log.post).perform(type)
     rescue PostAction::AlreadyActed => e
       raise InvalidPostAction.new(e)
     end

lib/post_action_creator.rb

@@ -0,0 +1,20 @@
+# creates post actions based on a post and a user
+class PostActionCreator
+
+  def initialize(user, post)
+    @user = user
+    @post = post
+  end
+
+  def perform(action)
+    guardian.ensure_post_can_act!(@post, action, taken_actions: PostAction.counts_for([@post], @user)[@post.id])
+    PostAction.act(@user, @post, action)
+  end
+
+  private
+
+  def guardian
+    @guardian ||= Guardian.new(@user)
+  end
+
+end