* libs/httpd: added ETag, Date, Content-Type and Last-Modified header support to file handler

libs/httpd/luasrc/httpd/handler/file.lua

@@ -1,14 +1,35 @@
+--[[
+
+HTTP server implementation for LuCI - luci handler
+(c) 2008 Steven Barth <steven@midlink.org>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+
+]]--
+
 module("luci.httpd.handler.file", package.seeall)
+
 require("luci.httpd.module")
+require("luci.http.protocol.date")
+require("luci.http.protocol.mime")
 require("luci.fs")
 require("ltn12")
 
 Simple = luci.util.class(luci.httpd.module.Handler)
 Response = luci.httpd.module.Response
 
-function Simple.__init__(self, docroot)
+function Simple.__init__(self, docroot, dirlist)
 	luci.httpd.module.Handler.__init__(self)
 	self.docroot = docroot
+	self.dirlist = dirlist and true or false
+	self.mime    = luci.http.protocol.mime
+	self.date    = luci.http.protocol.date
 end
 
 function Simple.getfile(self, uri)
@@ -18,17 +39,35 @@ function Simple.getfile(self, uri)
 	return file, stat
 end
 
+
+function Simple._mk_etag(self, stat)
+	return string.format( "%x-%x-%x", stat.ino, stat.size, stat.mtime )
+end
+
+function Simple._cmp_etag(self, stat, etag)
+	return ( self:_mk_etag(stat) == etag )
+end
+
+
 function Simple.handle_get(self, request, sourcein, sinkerr)
 	local file, stat = self:getfile(request.env.PATH_INFO)
 
 	if stat then
 		if stat.type == "regular" then
-			return Response(200, {["Content-Length"] = stat.size}), ltn12.source.file(io.open(file))
+			return Response(
+				200, {
+					["Date"]           = self.date.to_http( os.time() );
+					["Last-Modified"]  = self.date.to_http( stat.mtime );
+					["Content-Type"]   = self.mime.to_mime( file );
+					["Content-Length"] = stat.size;
+					["ETag"]           = self:_mk_etag( stat );
+				}
+			), ltn12.source.file(io.open(file))
 		else
-			return self:failure(403, "Unable to transmit " .. stat.type .. " " .. request.env.PATH_INFO)
+			return self:failure(403, "Unable to transmit " .. stat.type .. " " .. file)
 		end
 	else
-		return self:failure(404, "No such file: " .. uri)
+		return self:failure(404, "No such file: " .. file)
 	end
 end