FIX: moderators can't see private topics that they aren't invited to see.

app/models/post_action.rb

@@ -96,9 +96,15 @@ class PostAction < ActiveRecord::Base
 
     return unless opts[:message] && [:notify_moderators, :notify_user].include?(post_action_type)
 
+    target_usernames = if post_action_type == :notify_user
+      post.user.username
+    elsif post_action_type == :notify_moderators
+      User.moderators.pluck(:username)
+    else
       # this is a hack to allow a PM with no reciepients, we should think through
       # a cleaner technique, a PM with myself is valid for flagging
-    target_usernames = post_action_type == :notify_user ? post.user.username : "x"
+      'x'
+    end
 
     title = I18n.t("post_action_types.#{post_action_type}.email_title",
                     title: post.topic.title)

lib/guardian/topic_guardian.rb

@@ -46,7 +46,7 @@ module TopicGuardian
 
   def can_see_topic?(topic)
     return false unless topic
-    return true if is_staff?
+    return true if is_admin?
     return false if topic.deleted_at
 
     # NOTE
@@ -56,7 +56,7 @@ module TopicGuardian
     # not secure, or I can see it
     (not(topic.read_restricted_category?) || can_see_category?(topic.category)) &&
     # not private, or I am allowed (or is staff)
-    (not(topic.private_message?) || (authenticated? && (is_staff? || topic.all_allowed_users.where(id: @user.id).exists?)))
+    (not(topic.private_message?) || (authenticated? && (is_admin? || topic.all_allowed_users.where(id: @user.id).exists?)))
 
   end
 end

spec/components/guardian_spec.rb

@@ -301,6 +301,15 @@ describe Guardian do
 
         Guardian.new(user).can_see?(topic).should be_true
       end
+
+      it "restricts private topics" do
+        user.save!
+        private_topic = Fabricate(:private_message_topic, user: user)
+        Guardian.new(private_topic.user).can_see?(private_topic).should be_true
+        Guardian.new(build(:user)).can_see?(private_topic).should be_false
+        Guardian.new(moderator).can_see?(private_topic).should be_false
+        Guardian.new(admin).can_see?(private_topic).should be_true
+      end
     end
 
     describe 'a Post' do

spec/components/post_creator_spec.rb

@@ -338,13 +338,13 @@ describe PostCreator do
       unrelated.notifications.count.should == 0
       post.topic.subtype.should == TopicSubtype.user_to_user
 
-      # if a mod replies they should be added to the allowed user list
-      mod = Fabricate(:moderator)
-      PostCreator.create(mod, raw: 'hi there welcome topic, I am a mod',
+      # if an admin replies they should be added to the allowed user list
+      admin = Fabricate(:admin)
+      PostCreator.create(admin, raw: 'hi there welcome topic, I am a mod',
                          topic_id: post.topic_id)
 
       post.topic.reload
-      post.topic.topic_allowed_users.where(user_id: mod.id).count.should == 1
+      post.topic.topic_allowed_users.where(user_id: admin.id).count.should == 1
     end
   end
 

spec/components/topic_view_spec.rb

@@ -19,10 +19,10 @@ describe TopicView do
   end
 
   it "handles deleted topics" do
-    topic.trash!(coding_horror)
-    lambda { TopicView.new(topic.id, coding_horror) }.should raise_error(Discourse::NotFound)
-    coding_horror.stubs(:staff?).returns(true)
-    lambda { TopicView.new(topic.id, coding_horror) }.should_not raise_error
+    admin = Fabricate(:admin)
+    topic.trash!(admin)
+    lambda { TopicView.new(topic.id, Fabricate(:user)) }.should raise_error(Discourse::NotFound)
+    lambda { TopicView.new(topic.id, admin) }.should_not raise_error
   end
 
 

spec/models/post_action_spec.rb

@@ -29,6 +29,11 @@ describe PostAction do
       action.related_post_id.should == posts[0].id.to_i
       posts[0].subtype.should == TopicSubtype.notify_moderators
 
+      # Moderators should be invited to the private topic, otherwise they're not permitted to see it
+      topic_user_ids = posts[0].topic.topic_users.map {|x| x.user_id}
+      topic_user_ids.should include(codinghorror.id)
+      topic_user_ids.should include(mod.id)
+
       # reply to PM should clear flag
       p = PostCreator.new(mod, topic_id: posts[0].topic_id, raw: "This is my test reply to the user, it should clear flags")
       p.create