FEATURE: automatically hide non-TL4 posts when flagged by a TL4 user

app/models/post.rb

@@ -117,7 +117,8 @@ class Post < ActiveRecord::Base
                                  flag_threshold_reached_again: 2,
                                  new_user_spam_threshold_reached: 3,
                                  flagged_by_tl3_user: 4,
-                                 email_spam_header_found: 5)
+                                 email_spam_header_found: 5,
+                                 flagged_by_tl4_user: 6)
   end
 
   def self.types

app/models/post_action.rb

@@ -583,8 +583,13 @@ class PostAction < ActiveRecord::Base
 
       hide_post!(post, post_action_type, Post.hidden_reasons[:flagged_by_tl3_user])
 
-    elsif PostActionType.auto_action_flag_types.include?(post_action_type) &&
-          SiteSetting.flags_required_to_hide_post > 0
+    elsif PostActionType.auto_action_flag_types.include?(post_action_type)
+
+      if acting_user.has_trust_level?(TrustLevel[4]) &&
+         post.user&.trust_level != TrustLevel[4]
+
+        hide_post!(post, post_action_type, Post.hidden_reasons[:flagged_by_tl4_user])
+      elsif SiteSetting.flags_required_to_hide_post > 0
 
         _old_flags, new_flags = PostAction.flag_counts_for(post.id)
 
@@ -593,6 +598,7 @@ class PostAction < ActiveRecord::Base
         end
       end
     end
+  end
 
   def self.hide_post!(post, post_action_type, reason = nil)
     return if post.hidden

spec/models/post_action_spec.rb

@@ -501,6 +501,37 @@ describe PostAction do
       expect(post.hidden_reason_id).to eq(Post.hidden_reasons[:flagged_by_tl3_user])
     end
 
+    it "hide non-tl4 posts that are flagged by a tl4 user" do
+      SiteSetting.site_contact_username = admin.username
+
+      post_action_type = PostActionType.types[:spam]
+      tl4_user = Fabricate(:trust_level_4)
+
+      user = Fabricate(:leader)
+      post = create_post(user: user)
+
+      PostAction.act(tl4_user, post, post_action_type)
+
+      post.reload
+
+      expect(post.hidden).to be_truthy
+      expect(post.hidden_at).to be_present
+      expect(post.hidden_reason_id).to eq(Post.hidden_reasons[:flagged_by_tl4_user])
+
+      post = create_post(user: user)
+      PostAction.act(Fabricate(:leader), post, post_action_type)
+      post.reload
+
+      expect(post.hidden).to be_falsey
+
+      user = Fabricate(:trust_level_4)
+      post = create_post(user: user)
+      PostAction.act(tl4_user, post, post_action_type)
+      post.reload
+
+      expect(post.hidden).to be_falsey
+    end
+
     it "can flag the topic instead of a post" do
       post1 = create_post
       _post2 = create_post(topic: post1.topic)