-- Helper Functions
function file_exists(path)
   local attr = lighty.stat(path)
   if (attr and attr["is_file"]) then
      return true
   else
      return false
   end
end

function removePrefix(str, prefix)
   return str:sub(1,#prefix+1) == prefix.."/" and str:sub(#prefix+2)
end

function string.starts(x,y)
   return string.sub(x,1,string.len(y)) == y
end

-- Set for subdirectory drupal installs. Example: "/drupal"
local prefix = ''

-- If this is not an existing file
if (not file_exists(lighty.env["physical.path"])) then

  -- Set local variables
  local FINAL_PATH = "empty"
  local request_uri = removePrefix(lighty.env["uri.path"], prefix) -- none should be set to '/'
  local query_string = lighty.env["uri.query"]
	local cookies = lighty.request["Cookie"] or "NOCOOKIE"

  -- filters for boost cache (anon+GET) to qualify boost caching
  local SERVE_CACHED_FLAG = (string.find(cookies, "DRUPAL_UID") == nil) and (lighty.env["request.method"] == "GET")
  local RESTRICTED_PATHS = (string.starts(request_uri, "/admin"))
                or (string.starts(request_uri, "/cache"))
                or (string.starts(request_uri, "/openid"))
                or (string.starts(request_uri, "/node/add"))
                or (string.starts(request_uri, "/user"))
								
  -- qualifies for boost cache type
  if (SERVE_CACHED_FLAG == true and RESTRICTED_PATHS == false) then

		-- Boost cache path (needs to be explicitly set here because it is not the same on my Lighty config as in .htaccess)
		-- (replace this with the path to your site's cache directory)
		local boost_cache_path = "/home/USER/public_html/SITE/cache"
		
		-- Build filename based on URL for the boost JS/CSS cache
    local perm_boost_path_uribase = boost_cache_path .. lighty.request["Host"] .. "/" .. request_uri .. "_"
    if (query_string) then
      normal_boost_path_uribase = normal_boost_path_uribase ..  query_string
    end

    -- Set Final Path, Content-Type & Content-Encoding if this file exists.
      if (file_exists(perm_boost_path_uribase .. ".css")) then
        FINAL_PATH = perm_boost_path_uribase .. ".css"
        lighty.header["Content-Type"] = "text/css"
      elseif (file_exists(perm_boost_path_uribase .. ".js")) then
        FINAL_PATH = perm_boost_path_uribase .. ".js"
        lighty.header["Content-Type"] = "text/javascript"
    end
	
	-- do the actual redirection	
	lighty.env["physical.path"] = FINAL_PATH

	end
end