Adds support for api_key authentication

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 .bundle
+dump.rdb
 db/*.sqlite3
 log/*.log
 tmp/*
@@ -12,5 +13,6 @@ bin/
 config/database.yml
 .idea/*
 config/app_config.yml
+config/redis.conf
 src/
 spec/support/data/failed_remote/*

Procfile

@@ -1,5 +1,5 @@
 web:    bundle exec rails server -p $PORT
 sql:    node ../CartoDB-SQL-API/app.js development
 tiler:  node ../Windshaft-cartodb/app.js development
-redis:  redis-server
+redis:  redis-server config/redis.conf
 resque: script/resque

app/controllers/application_controller.rb

@@ -61,7 +61,7 @@ class ApplicationController < ActionController::Base
   end
 
   def api_authorization_required
-    authenticate!(:api_authentication, :scope => request.subdomain)
+    authenticate!(:api_key, :api_authentication, :scope => request.subdomain)
   end
 
   def not_authorized

config/initializers/warden.rb

@@ -50,6 +50,32 @@ Warden::Strategies.add(:api_authentication) do
   end
 end
 
+Warden::Strategies.add(:api_key) do
+  def valid?
+    params[:api_key].present?
+  end
+
+  def authenticate!
+    begin
+      if (api_key = params[:api_key]) && api_key.present?
+        user_name = request.subdomain
+        if $users_metadata.SISMEMBER "rails:users:#{user_name}:map_key", api_key
+          user_id = $users_metadata.HGET "rails:users:#{user_name}", 'id'
+          return fail! if user_id.blank?
+          user    = User[user_id]
+          success!(user)
+        else
+          fail!
+        end
+      else
+        fail!
+      end
+    rescue
+      fail!
+    end
+  end
+end
+
 Warden::Manager.after_authentication do |user,auth,opts|
   user.set_map_key
 end