Fix /p/post/user route not saving referrals

Make user id optional for /p/id/uid
Add /posts/id/raw route for debugging failed post processing

app/controllers/posts_controller.rb

@@ -8,10 +8,17 @@ class PostsController < ApplicationController
   before_filter :ensure_logged_in, except: [:show, :replies, :by_number, :short_link, :reply_history, :revisions, :expand_embed, :markdown, :raw, :cooked]
 
   skip_before_filter :store_incoming_links, only: [:short_link]
-  skip_before_filter :check_xhr, only: [:markdown,:short_link]
+  skip_before_filter :check_xhr, only: [:markdown_id, :markdown_num, :short_link]
 
-  def markdown
-    post = Post.find_by(topic_id: params[:topic_id].to_i, post_number: (params[:post_number] || 1).to_i)
+  def markdown_id
+    markdown Post.find(params[:id].to_i)
+  end
+
+  def markdown_num
+    markdown Post.find_by(topic_id: params[:topic_id].to_i, post_number: (params[:post_number] || 1).to_i)
+  end
+
+  def markdown(post)
     if post && guardian.can_see?(post)
       render text: post.raw, content_type: 'text/plain'
     else
@@ -26,7 +33,13 @@ class PostsController < ApplicationController
 
   def short_link
     post = Post.find(params[:post_id].to_i)
+    # Stuff the user in the request object, because that's what IncomingLink wants
+    if params[:user_id]
+      user = User.find(params[:user_id].to_i)
+      request['u'] = user.username_lower if user
+    end
     IncomingLink.add(request, current_user)
+
     redirect_to post.url
   end
 

app/models/incoming_link.rb

@@ -27,7 +27,7 @@ class IncomingLink < ActiveRecord::Base
     end
 
     if host != request.host && (user_id || referer)
-      cid = current_user.id if current_user
+      cid = current_user ? (current_user.id) : (nil)
       unless cid && cid == user_id
         IncomingLink.create(url: request.url,
                             referer: referer,

config/routes.rb

@@ -246,8 +246,6 @@ Discourse::Application.routes.draw do
     end
   end
 
-  get "p/:post_id/:user_id" => "posts#short_link"
-
   resources :notifications
 
   match "/auth/:provider/callback", to: "users/omniauth_callbacks#complete", via: [:get, :post]
@@ -365,9 +363,11 @@ Discourse::Application.routes.draw do
 
   post "t/:topic_id/notifications" => "topics#set_notifications" , constraints: {topic_id: /\d+/}
 
+  get "p/:post_id(/:user_id)" => "posts#short_link"
   get "/posts/:id/cooked" => "posts#cooked"
   get "/posts/:id/expand-embed" => "posts#expand_embed"
-  get "raw/:topic_id(/:post_number)" => "posts#markdown"
+  get "/posts/:id/raw" => "posts#markdown_id"
+  get "raw/:topic_id(/:post_number)" => "posts#markdown_num"
 
   resources :invites do
     collection do

spec/controllers/posts_controller_spec.rb

@@ -49,10 +49,11 @@ describe PostsController do
 
   describe 'short_link' do
     let(:post) { Fabricate(:post) }
+    let(:user) { Fabricate(:user) }
 
     it 'logs the incoming link once' do
       IncomingLink.expects(:add).once.returns(true)
-      get :short_link, post_id: post.id, user_id: 999
+      get :short_link, post_id: post.id, user_id: user.id
       response.should be_redirect
     end
   end