add legacy artist json api

app/models/artist.rb

@@ -284,6 +284,18 @@ class Artist < ActiveRecord::Base
     end
   end
   
+  def legacy_api_hash
+    return {
+      :id => id, 
+      :name => name, 
+      :other_names => other_names,
+      :group_name => group_name,
+      :urls => artist_urls.map {|x| x.url},
+      :is_active => is_active?,
+      :updater_id => 0
+    }
+  end
+  
   def initialize_creator
     self.creator_id = CurrentUser.user.id
   end

app/views/legacy/artists.json.erb

@@ -0,0 +1 @@
+[<%= raw @artists.map(&:to_json).join(",") %>]

config/routes.rb

@@ -201,7 +201,8 @@ Danbooru::Application.routes.draw do
 
   # legacy aliases
   match "/artist" => redirect {|params, req| "/artists?page=#{req.params[:page]}"}
-  match "/artist/index.xml", :controller => "legacy", :action => "artists"
+  match "/artist/index.xml", :controller => "legacy", :action => "artists", :format => "xml"
+  match "/artist/index.json", :controller => "legacy", :action => "artists", :format => "json"
   match "/artist/index" => redirect {|params, req| "/artists?page=#{req.params[:page]}"}
   match "/artist/show/:id" => redirect("/artists/%{id}")
   match "/artist/show" => redirect {|params, req| "/artists?name=#{CGI::escape(req.params[:name])}"}