FIX: Silenced users shouldn't be able to act on posts

lib/guardian/post_guardian.rb

@@ -36,6 +36,10 @@ module PostGuardian
     already_did_flagging      = taken.any? && (taken & PostActionType.notify_flag_types.values).any?
 
     result = if authenticated? && post && !@user.anonymous?
+
+      # Silenced users can't act on posts
+      return false if @user.silenced?
+
       # post made by staff, but we don't allow staff flags
       return false if is_flag &&
         (!SiteSetting.allow_flagging_staff?) &&

spec/components/guardian_spec.rb

@@ -104,6 +104,11 @@ describe Guardian do
       expect(Guardian.new(user).post_can_act?(post, :like)).to be_falsey
     end
 
+    it "returns false when the user is silenced" do
+      UserSilencer.silence(user, admin)
+      expect(Guardian.new(user).post_can_act?(post, :spam)).to be_falsey
+    end
+
     it "allows flagging archived posts" do
       post.topic.archived = true
       expect(Guardian.new(user).post_can_act?(post, :spam)).to be_truthy