1 files changed, 52 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/http/url.rb b/actionpack/lib/action_dispatch/http/url.rb
index 1e7054f381..51d4766282 100644
--- a/actionpack/lib/action_dispatch/http/url.rb
+++ b/actionpack/lib/action_dispatch/http/url.rb
@@ -24,6 +24,58 @@ module ActionDispatch
         !(host.nil? || /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(host))
       end
 
+      def self.url_for(options = {})
+        unless options[:host].present? || options[:only_path].present?
+          raise ArgumentError, 'Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true'
+        end
+
+        rewritten_url = ""
+
+        unless options[:only_path]
+          rewritten_url << (options[:protocol] || "http")
+          rewritten_url << "://" unless rewritten_url.match("://")
+          rewritten_url << rewrite_authentication(options)
+          rewritten_url << host_or_subdomain_and_domain(options)
+          rewritten_url << ":#{options.delete(:port)}" if options[:port]
+        end
+
+        path = options.delete(:path) || ''
+
+        params = options[:params] || {}
+        params.reject! {|k,v| !v }
+
+        rewritten_url << (options[:trailing_slash] ? path.sub(/\?|\z/) { "/" + $& } : path)
+        rewritten_url << "?#{params.to_query}" unless params.empty?
+        rewritten_url << "##{Rack::Mount::Utils.escape_uri(options[:anchor].to_param.to_s)}" if options[:anchor]
+        rewritten_url
+      end
+
+      class << self
+        private
+
+        def rewrite_authentication(options)
+          if options[:user] && options[:password]
+            "#{Rack::Utils.escape(options[:user])}:#{Rack::Utils.escape(options[:password])}@"
+          else
+            ""
+          end
+        end
+
+        def host_or_subdomain_and_domain(options)
+          return options[:host] unless options[:subdomain] || options[:domain]
+
+          tld_length = options[:tld_length] || @@tld_length
+
+          host = ""
+          host << (options[:subdomain] || extract_subdomain(options[:host], tld_length))
+          host << "."
+          host << (options[:domain]    || extract_domain(options[:host], tld_length))
+          host
+        end
+
+      end
+
+
 
       # Returns the complete URL used for this request.
       def url