When system flags users as sockpuppets, show a reason in the admin flags ui

app/assets/javascripts/admin/models/flagged_post.js

@@ -38,7 +38,8 @@ Discourse.FlaggedPost = Discourse.Post.extend({
         r.push({
           user: _this.userLookup[action.user_id],
           message: action.message,
-          permalink: action.permalink
+          permalink: action.permalink,
+          bySystemUser: (action.user_id === -1 ? true : false)
         });
       }
     });

app/assets/javascripts/admin/templates/flags.js.handlebars

@@ -54,7 +54,13 @@
             <tr>
               <td></td>
               <td class='message'>
-                <div>{{#link-to 'adminUser' user}}{{avatar user imageSize="small"}}{{/link-to}} {{message}} <a href="{{unbound permalink}}"><button class='btn'><i class="icon-reply"></i> {{i18n admin.flags.view_message}}</button></a></div>
+                <div>
+                  {{#link-to 'adminUser' user}}{{avatar user imageSize="small"}}{{/link-to}}
+                  {{message}}
+                  {{#unless bySystemUser}}
+                    <a href="{{unbound permalink}}"><button class='btn'><i class="icon-reply"></i> {{i18n admin.flags.view_message}}</button></a>
+                  {{/unless}}
+                </div>
               </td>
               <td></td>
               <td></td>

app/services/spam_rules_enforcer.rb

@@ -40,9 +40,9 @@ class SpamRulesEnforcer
 
   def flag_sockpuppet_users
     system_user = Discourse.system_user
-    PostAction.act(system_user, @post, PostActionType.types[:spam]) rescue PostAction::AlreadyActed
+    PostAction.act(system_user, @post, PostActionType.types[:spam], message: I18n.t('flag_reason.sockpuppet')) rescue PostAction::AlreadyActed
     if (first_post = @post.topic.posts.by_post_number.first).try(:user).try(:new_user?)
-      PostAction.act(system_user, first_post, PostActionType.types[:spam]) rescue PostAction::AlreadyActed
+      PostAction.act(system_user, first_post, PostActionType.types[:spam], message: I18n.t('flag_reason.sockpuppet')) rescue PostAction::AlreadyActed
     end
   end
 

config/locales/server.en.yml

@@ -1159,3 +1159,6 @@ en:
       fetch_failure: "Sorry, there has been an error while fetching the image."
       unknown_image_type: "Sorry, but the file you tried to upload doesn't appear to be an image."
       size_not_found: "Sorry, but we couldn't determine the size of the image. Maybe your image is corrupted?"
+
+  flag_reason:
+    sockpuppet: "A new user created a topic, and another new user at the same IP address replied. See the flag_sockpuppets site setting."