1 files changed, 67 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/static.rb b/actionpack/lib/action_dispatch/middleware/static.rb
new file mode 100644
index 0000000000..2764584fe9
--- /dev/null
+++ b/actionpack/lib/action_dispatch/middleware/static.rb
@@ -0,0 +1,67 @@
+require 'rack/utils'
+require 'active_support/core_ext/uri'
+
+module ActionDispatch
+  class FileHandler
+    def initialize(root, cache_control)
+      @root          = root.chomp('/')
+      @compiled_root = /^#{Regexp.escape(root)}/
+      headers = cache_control && { 'Cache-Control' => cache_control }
+      @file_server   = ::Rack::File.new(@root, headers)
+    end
+
+    def match?(path)
+      path = unescape_path(path)
+      return false unless path.valid_encoding?
+
+      full_path = path.empty? ? @root : File.join(@root, escape_glob_chars(path))
+      paths = "#{full_path}#{ext}"
+
+      matches = Dir[paths]
+      match = matches.detect { |m| File.file?(m) }
+      if match
+        match.sub!(@compiled_root, '')
+        ::Rack::Utils.escape(match)
+      end
+    end
+
+    def call(env)
+      @file_server.call(env)
+    end
+
+    def ext
+      @ext ||= begin
+        ext = ::ActionController::Base.default_static_extension
+        "{,#{ext},/index#{ext}}"
+      end
+    end
+
+    def unescape_path(path)
+      URI.parser.unescape(path)
+    end
+
+    def escape_glob_chars(path)
+      path.gsub(/[*?{}\[\]]/, "\\\\\\&")
+    end
+  end
+
+  class Static
+    def initialize(app, path, cache_control=nil)
+      @app = app
+      @file_handler = FileHandler.new(path, cache_control)
+    end
+
+    def call(env)
+      case env['REQUEST_METHOD']
+      when 'GET', 'HEAD'
+        path = env['PATH_INFO'].chomp('/')
+        if match = @file_handler.match?(path)
+          env["PATH_INFO"] = match
+          return @file_handler.call(env)
+        end
+      end
+
+      @app.call(env)
+    end
+  end
+end