X-Git-Url: https://git.archive.openwrt.org/?p=project%2Fluci.git;a=blobdiff_plain;f=libs%2Fweb%2Fluasrc%2Fdispatcher.lua;h=3d0db5a21e0fd0b0f6b06181ed99b59dcdd6fa76;hp=09e99e7decd233b4c301b712b4438994bb193e8e;hb=6e97be1e9233fe7d99818bba394c2649a4433cc7;hpb=47c07adf75ccdaec3f80aab009cf0819d24d4a3e

diff --git a/libs/web/luasrc/dispatcher.lua b/libs/web/luasrc/dispatcher.lua
index 09e99e7de..3d0db5a21 100644
--- a/libs/web/luasrc/dispatcher.lua
+++ b/libs/web/luasrc/dispatcher.lua
@@ -25,14 +25,18 @@ limitations under the License.
 ]]--
 
 --- LuCI web dispatcher.
-local fs = require "luci.fs"
+local fs = require "nixio.fs"
 local sys = require "luci.sys"
 local init = require "luci.init"
 local util = require "luci.util"
 local http = require "luci.http"
+local nixio = require "nixio", require "nixio.util"
 
 module("luci.dispatcher", package.seeall)
-context = luci.util.threadlocal()
+context = util.threadlocal()
+uci = require "luci.model.uci"
+i18n = require "luci.i18n"
+_M.fs = fs
 
 authenticator = {}
 
@@ -47,7 +51,26 @@ local fi
 -- @param ...	Virtual path
 -- @return 		Relative URL
 function build_url(...)
-	return luci.http.getenv("SCRIPT_NAME") .. "/" .. table.concat(arg, "/")
+	local path = {...}
+	local url = { http.getenv("SCRIPT_NAME") or "" }
+
+	local k, v
+	for k, v in pairs(context.urltoken) do
+		url[#url+1] = "/;"
+		url[#url+1] = http.urlencode(k)
+		url[#url+1] = "="
+		url[#url+1] = http.urlencode(v)
+	end
+
+	local p
+	for _, p in ipairs(path) do
+		if p:match("^[a-zA-Z0-9_%-%.%%/,;]+$") then
+			url[#url+1] = "/"
+			url[#url+1] = p
+		end
+	end
+
+	return table.concat(url, "")
 end
 
 --- Send a 404 error code and render the "error404" template if available.
@@ -69,12 +92,17 @@ end
 -- @param message	Custom error message (optional)#
 -- @return			false
 function error500(message)
-	luci.http.status(500, "Internal Server Error")
-
-	require("luci.template")
-	if not luci.util.copcall(luci.template.render, "error500", {message=message}) then
+	luci.util.perror(message)
+	if not context.template_header_sent then
+		luci.http.status(500, "Internal Server Error")
 		luci.http.prepare_content("text/plain")
 		luci.http.write(message)
+	else
+		require("luci.template")
+		if not luci.util.copcall(luci.template.render, "error500", {message=message}) then
+			luci.http.prepare_content("text/plain")
+			luci.http.write(message)
+		end
 	end
 	return false
 end
@@ -82,128 +110,230 @@ end
 function authenticator.htmlauth(validator, accs, default)
 	local user = luci.http.formvalue("username")
 	local pass = luci.http.formvalue("password")
-	
+
 	if user and validator(user, pass) then
 		return user
 	end
-	
+
 	require("luci.i18n")
 	require("luci.template")
 	context.path = {}
 	luci.template.render("sysauth", {duser=default, fuser=user})
 	return false
-	
+
 end
 
 --- Dispatch an HTTP request.
 -- @param request	LuCI HTTP Request object
-function httpdispatch(request)
+function httpdispatch(request, prefix)
 	luci.http.context.request = request
-	context.request = {}
-	local pathinfo = request:getenv("PATH_INFO") or ""
 
-	for node in pathinfo:gmatch("[^/]+") do
-		table.insert(context.request, node)
+	local r = {}
+	context.request = r
+	local pathinfo = http.urldecode(request:getenv("PATH_INFO") or "", true)
+
+	if prefix then
+		for _, node in ipairs(prefix) do
+			r[#r+1] = node
+		end
 	end
 
-	local stat, err = util.copcall(dispatch, context.request)
-	if not stat then
-		error500(err)
+	for node in pathinfo:gmatch("[^/]+") do
+		r[#r+1] = node
 	end
-	
+
+	local stat, err = util.coxpcall(function()
+		dispatch(context.request)
+	end, error500)
+
 	luci.http.close()
+
+	--context._disable_memtrace()
 end
 
 --- Dispatches a LuCI virtual path.
 -- @param request	Virtual path
 function dispatch(request)
+	--context._disable_memtrace = require "luci.debug".trap_memtrace("l")
 	local ctx = context
 	ctx.path = request
-	
-	require "luci.i18n".setlanguage(require "luci.config".main.lang)
-	
+	ctx.urltoken   = ctx.urltoken or {}
+
+	local conf = require "luci.config"
+	assert(conf.main,
+		"/etc/config/luci seems to be corrupt, unable to find section 'main'")
+
+	local lang = conf.main.lang or "auto"
+	if lang == "auto" then
+		local aclang = http.getenv("HTTP_ACCEPT_LANGUAGE") or ""
+		for lpat in aclang:gmatch("[%w-]+") do
+			lpat = lpat and lpat:gsub("-", "_")
+			if conf.languages[lpat] then
+				lang = lpat
+				break
+			end
+		end
+	end
+	require "luci.i18n".setlanguage(lang)
+
 	local c = ctx.tree
 	local stat
 	if not c then
 		c = createtree()
 	end
-	
+
 	local track = {}
 	local args = {}
-	context.args = args
+	ctx.args = args
+	ctx.requestargs = ctx.requestargs or args
 	local n
+	local t = true
+	local token = ctx.urltoken
+	local preq = {}
+	local freq = {}
 
 	for i, s in ipairs(request) do
-		c = c.nodes[s]
-		n = i
-		if not c then
-			break
+		local tkey, tval
+		if t then
+			tkey, tval = s:match(";(%w+)=([a-fA-F0-9]*)")
 		end
 
-		util.update(track, c)
-		
-		if c.leaf then
-			break
+		if tkey then
+			token[tkey] = tval
+		else
+			t = false
+			preq[#preq+1] = s
+			freq[#freq+1] = s
+			c = c.nodes[s]
+			n = i
+			if not c then
+				break
+			end
+
+			util.update(track, c)
+
+			if c.leaf then
+				break
+			end
 		end
 	end
 
 	if c and c.leaf then
 		for j=n+1, #request do
-			table.insert(args, request[j])
+			args[#args+1] = request[j]
+			freq[#freq+1] = request[j]
 		end
 	end
 
+	ctx.requestpath = ctx.requestpath or freq
+	ctx.path = preq
+
 	if track.i18n then
 		require("luci.i18n").loadc(track.i18n)
 	end
-	
+
 	-- Init template engine
-	if not track.notemplate then
+	if (c and c.index) or not track.notemplate then
 		local tpl = require("luci.template")
-		local viewns = {}
-		tpl.context.viewns = viewns
-		viewns.write       = luci.http.write
-		viewns.translate   = function(...) return require("luci.i18n").translate(...) end
-		viewns.striptags   = util.striptags
-		viewns.controller  = luci.http.getenv("SCRIPT_NAME")
-		viewns.media       = luci.config.main.mediaurlbase
-		viewns.resource    = luci.config.main.resourcebase
-		viewns.REQUEST_URI = (luci.http.getenv("SCRIPT_NAME") or "") .. (luci.http.getenv("PATH_INFO") or "")
-	end
-	
+		local media = track.mediaurlbase or luci.config.main.mediaurlbase
+		if not pcall(tpl.Template, "themes/%s/header" % fs.basename(media)) then
+			media = nil
+			for name, theme in pairs(luci.config.themes) do
+				if name:sub(1,1) ~= "." and pcall(tpl.Template,
+				 "themes/%s/header" % fs.basename(theme)) then
+					media = theme
+				end
+			end
+			assert(media, "No valid theme found")
+		end
+
+		tpl.context.viewns = setmetatable({
+		   write       = luci.http.write;
+		   include     = function(name) tpl.Template(name):render(getfenv(2)) end;
+		   translate   = function(...) return require("luci.i18n").translate(...) end;
+		   export      = function(k, v) if tpl.context.viewns[k] == nil then tpl.context.viewns[k] = v end end;
+		   striptags   = util.striptags;
+		   pcdata      = util.pcdata;
+		   media       = media;
+		   theme       = fs.basename(media);
+		   resource    = luci.config.main.resourcebase
+		}, {__index=function(table, key)
+			if key == "controller" then
+				return build_url()
+			elseif key == "REQUEST_URI" then
+				return build_url(unpack(ctx.requestpath))
+			else
+				return rawget(table, key) or _G[key]
+			end
+		end})
+	end
+
 	track.dependent = (track.dependent ~= false)
 	assert(not track.dependent or not track.auto, "Access Violation")
-	
+
 	if track.sysauth then
 		local sauth = require "luci.sauth"
-		
+
 		local authen = type(track.sysauth_authenticator) == "function"
 		 and track.sysauth_authenticator
 		 or authenticator[track.sysauth_authenticator]
-		 
+
 		local def  = (type(track.sysauth) == "string") and track.sysauth
 		local accs = def and {track.sysauth} or track.sysauth
-		local sess = ctx.authsession or luci.http.getcookie("sysauth")
-		sess = sess and sess:match("^[A-F0-9]+$")
-		local user = sauth.read(sess)
-		
+		local sess = ctx.authsession
+		local verifytoken = false
+		if not sess then
+			sess = luci.http.getcookie("sysauth")
+			sess = sess and sess:match("^[a-f0-9]*$")
+			verifytoken = true
+		end
+
+		local sdat = sauth.read(sess)
+		local user
+
+		if sdat then
+			sdat = loadstring(sdat)
+			setfenv(sdat, {})
+			sdat = sdat()
+			if not verifytoken or ctx.urltoken.stok == sdat.token then
+				user = sdat.user
+			end
+		else
+			local eu = http.getenv("HTTP_AUTH_USER")
+			local ep = http.getenv("HTTP_AUTH_PASS")
+			if eu and ep and luci.sys.user.checkpasswd(eu, ep) then
+				authen = function() return eu end
+			end
+		end
+
 		if not util.contains(accs, user) then
 			if authen then
+				ctx.urltoken.stok = nil
 				local user, sess = authen(luci.sys.user.checkpasswd, accs, def)
 				if not user or not util.contains(accs, user) then
 					return
 				else
 					local sid = sess or luci.sys.uniqueid(16)
-					luci.http.header("Set-Cookie", "sysauth=" .. sid.."; path=/")
 					if not sess then
-						sauth.write(sid, user)
+						local token = luci.sys.uniqueid(16)
+						sauth.write(sid, util.get_bytecode({
+							user=user,
+							token=token,
+							secret=luci.sys.uniqueid(16)
+						}))
+						ctx.urltoken.stok = token
 					end
+					luci.http.header("Set-Cookie", "sysauth=" .. sid.."; path="..build_url())
 					ctx.authsession = sid
+					ctx.authuser = user
 				end
 			else
 				luci.http.status(403, "Forbidden")
 				return
 			end
+		else
+			ctx.authsession = sess
+			ctx.authuser = user
 		end
 	end
 
@@ -215,14 +345,46 @@ function dispatch(request)
 		luci.sys.process.setuser(track.setuser)
 	end
 
-	if c and type(c.target) == "function" then
-		context.dispatched = c
-		
+	local target = nil
+	if c then
+		if type(c.target) == "function" then
+			target = c.target
+		elseif type(c.target) == "table" then
+			target = c.target.target
+		end
+	end
+
+	if c and (c.index or type(target) == "function") then
+		ctx.dispatched = c
+		ctx.requested = ctx.requested or ctx.dispatched
+	end
+
+	if c and c.index then
+		local tpl = require "luci.template"
+
+		if util.copcall(tpl.render, "indexer", {}) then
+			return true
+		end
+	end
+
+	if type(target) == "function" then
 		util.copcall(function()
-			util.updfenv(c.target, require(c.module))
+			local oldenv = getfenv(target)
+			local module = require(c.module)
+			local env = setmetatable({}, {__index=
+
+			function(tbl, key)
+				return rawget(tbl, key) or module[key] or oldenv[key]
+			end})
+
+			setfenv(target, env)
 		end)
-		
-		c.target(unpack(args))
+
+		if type(c.target) == "table" then
+			target(c.target, unpack(args))
+		else
+			target(unpack(args))
+		end
 	else
 		error404()
 	end
@@ -231,8 +393,8 @@ end
 --- Generate the dispatching index using the best possible strategy.
 function createindex()
 	local path = luci.util.libpath() .. "/controller/"
-	local suff = ".lua"
-	
+	local suff = { ".lua", ".lua.gz" }
+
 	if luci.util.copcall(require, "luci.fastindex") then
 		createindex_fastindex(path, suff)
 	else
@@ -242,17 +404,19 @@ end
 
 --- Generate the dispatching index using the fastindex C-indexer.
 -- @param path		Controller base directory
--- @param suffix	Controller file suffix
-function createindex_fastindex(path, suffix)
+-- @param suffixes	Controller file suffixes
+function createindex_fastindex(path, suffixes)
 	index = {}
-		
+
 	if not fi then
 		fi = luci.fastindex.new("index")
-		fi.add(path .. "*" .. suffix)
-		fi.add(path .. "*/*" .. suffix)
+		for _, suffix in ipairs(suffixes) do
+			fi.add(path .. "*" .. suffix)
+			fi.add(path .. "*/*" .. suffix)
+		end
 	end
 	fi.scan()
-	
+
 	for k, v in pairs(fi.indexes) do
 		index[v[2]] = v[1]
 	end
@@ -260,43 +424,56 @@ end
 
 --- Generate the dispatching index using the native file-cache based strategy.
 -- @param path		Controller base directory
--- @param suffix	Controller file suffix
-function createindex_plain(path, suffix)
+-- @param suffixes	Controller file suffixes
+function createindex_plain(path, suffixes)
+	local controllers = { }
+	for _, suffix in ipairs(suffixes) do
+		nixio.util.consume((fs.glob(path .. "*" .. suffix)), controllers)
+		nixio.util.consume((fs.glob(path .. "*/*" .. suffix)), controllers)
+	end
+
 	if indexcache then
-		local cachedate = fs.mtime(indexcache)
-		if cachedate and cachedate > fs.mtime(path) then
+		local cachedate = fs.stat(indexcache, "mtime")
+		if cachedate then
+			local realdate = 0
+			for _, obj in ipairs(controllers) do
+				local omtime = fs.stat(path .. "/" .. obj, "mtime")
+				realdate = (omtime and omtime > realdate) and omtime or realdate
+			end
 
-			assert(
-				sys.process.info("uid") == fs.stat(indexcache, "uid")
-				and fs.stat(indexcache, "mode") == "rw-------",
-				"Fatal: Indexcache is not sane!"
-			)
+			if cachedate > realdate then
+				assert(
+					sys.process.info("uid") == fs.stat(indexcache, "uid")
+					and fs.stat(indexcache, "modestr") == "rw-------",
+					"Fatal: Indexcache is not sane!"
+				)
 
-			index = loadfile(indexcache)()
-			return index
-		end 		
+				index = loadfile(indexcache)()
+				return index
+			end
+		end
 	end
-	
-	index = {}
 
-	local controllers = util.combine(
-		luci.fs.glob(path .. "*" .. suffix) or {},
-		luci.fs.glob(path .. "*/*" .. suffix) or {}
-	)
+	index = {}
 
 	for i,c in ipairs(controllers) do
-		local module = "luci.controller." .. c:sub(#path+1, #c-#suffix):gsub("/", ".")
+		local module = "luci.controller." .. c:sub(#path+1, #c):gsub("/", ".")
+		for _, suffix in ipairs(suffixes) do
+			module = module:gsub(suffix.."$", "")
+		end
+
 		local mod = require(module)
 		local idx = mod.index
-		
+
 		if type(idx) == "function" then
 			index[module] = idx
 		end
 	end
-	
+
 	if indexcache then
-		fs.writefile(indexcache, util.get_bytecode(index))
-		fs.chmod(indexcache, "a-rwx,u+rw")
+		local f = nixio.open(indexcache, "w", 600)
+		f:writeall(util.get_bytecode(index))
+		f:close()
 	end
 end
 
@@ -306,32 +483,51 @@ function createtree()
 	if not index then
 		createindex()
 	end
-	
+
 	local ctx  = context
 	local tree = {nodes={}}
-	
+	local modi = {}
+
 	ctx.treecache = setmetatable({}, {__mode="v"})
 	ctx.tree = tree
-	
+	ctx.modifiers = modi
+
 	-- Load default translation
-	require "luci.i18n".loadc("default")
-	
-	local scope = setmetatable({}, {__index = _G})
-	for k,v in pairs(luci.dispatcher) do
-		if type(v) == "function" then
-			scope[k] = v
-		end
-	end
+	require "luci.i18n".loadc("base")
+
+	local scope = setmetatable({}, {__index = luci.dispatcher})
 
 	for k, v in pairs(index) do
 		scope._NAME = k
 		setfenv(v, scope)
 		v()
 	end
-	
+
+	local function modisort(a,b)
+		return modi[a].order < modi[b].order
+	end
+
+	for _, v in util.spairs(modi, modisort) do
+		scope._NAME = v.module
+		setfenv(v.func, scope)
+		v.func()
+	end
+
 	return tree
 end
 
+--- Register a tree modifier.
+-- @param	func	Modifier function
+-- @param	order	Modifier order value (optional)
+function modifier(func, order)
+	context.modifiers[#context.modifiers+1] = {
+		func = func,
+		order = order or 0,
+		module
+			= getfenv(2)._NAME
+	}
+end
+
 --- Clone a node of the dispatching tree to another position.
 -- @param	path	Virtual path destination
 -- @param	clone	Virtual path source
@@ -342,33 +538,24 @@ function assign(path, clone, title, order)
 	local obj  = node(unpack(path))
 	obj.nodes  = nil
 	obj.module = nil
-	
+
 	obj.title = title
 	obj.order = order
-	
-	local c = context.tree
-	for k, v in ipairs(clone) do
-		if not c.nodes[v] then
-			c.nodes[v] = {nodes={}}
-		end
 
-		c = c.nodes[v]
-	end
-	
-	setmetatable(obj, {__index = c})
-	
+	setmetatable(obj, {__index = _create_node(clone)})
+
 	return obj
 end
 
 --- Create a new dispatching node and define common parameters.
 -- @param	path	Virtual path
--- @param	target	Target function to call when dispatched. 
+-- @param	target	Target function to call when dispatched.
 -- @param	title	Destination node title
 -- @param	order	Destination node order value (optional)
 -- @return			Dispatching tree node
 function entry(path, target, title, order)
 	local c = node(unpack(path))
-	
+
 	c.target = target
 	c.title  = title
 	c.order  = order
@@ -377,14 +564,21 @@ function entry(path, target, title, order)
 	return c
 end
 
+--- Fetch or create a dispatching node without setting the target module or
+-- enabling the node.
+-- @param	...		Virtual path
+-- @return			Dispatching tree node
+function get(...)
+	return _create_node({...})
+end
+
 --- Fetch or create a new dispatching node.
 -- @param	...		Virtual path
 -- @return			Dispatching tree node
 function node(...)
-	local c = _create_node(arg)
+	local c = _create_node({...})
 
 	c.module = getfenv(2)._NAME
-	c.path = arg
 	c.auto = nil
 
 	return c
@@ -394,19 +588,20 @@ function _create_node(path, cache)
 	if #path == 0 then
 		return context.tree
 	end
-	
+
 	cache = cache or context.treecache
 	local name = table.concat(path, ".")
 	local c = cache[name]
-	
+
 	if not c then
+		local new = {nodes={}, auto=true, path=util.clone(path)}
 		local last = table.remove(path)
+
 		c = _create_node(path, cache)
-		
-		local new = {nodes={}, auto=true}
+
 		c.nodes[last] = new
 		cache[name] = new
-		
+
 		return new
 	else
 		return c
@@ -418,8 +613,12 @@ end
 --- Create a redirect to another dispatching node.
 -- @param	...		Virtual path destination
 function alias(...)
-	local req = arg
-	return function()
+	local req = {...}
+	return function(...)
+		for _, r in ipairs({...}) do
+			req[#req+1] = r
+		end
+
 		dispatch(req)
 	end
 end
@@ -428,75 +627,201 @@ end
 -- @param	n		Number of path values to replace
 -- @param	...		Virtual path to replace removed path values with
 function rewrite(n, ...)
-	local req = arg
-	return function()
-		for i=1,n do 
-			table.remove(context.path, 1)
+	local req = {...}
+	return function(...)
+		local dispatched = util.clone(context.dispatched)
+
+		for i=1,n do
+			table.remove(dispatched, 1)
+		end
+
+		for i, r in ipairs(req) do
+			table.insert(dispatched, i, r)
 		end
-		
-		for i,r in ipairs(req) do
-			table.insert(context.path, i, r)
+
+		for _, r in ipairs({...}) do
+			dispatched[#dispatched+1] = r
 		end
-		
-		dispatch()
+
+		dispatch(dispatched)
+	end
+end
+
+
+local function _call(self, ...)
+	if #self.argv > 0 then
+		return getfenv()[self.name](unpack(self.argv), ...)
+	else
+		return getfenv()[self.name](...)
 	end
 end
 
 --- Create a function-call dispatching target.
--- @param	name	Target function of local controller 
+-- @param	name	Target function of local controller
 -- @param	...		Additional parameters passed to the function
 function call(name, ...)
-	local argv = {...}
-	return function() return getfenv()[name](unpack(argv)) end
+	return {type = "call", argv = {...}, name = name, target = _call}
+end
+
+
+local _template = function(self, ...)
+	require "luci.template".render(self.view)
 end
 
 --- Create a template render dispatching target.
 -- @param	name	Template to be rendered
 function template(name)
-	return function()
-		require("luci.template")
-		luci.template.render(name)
-	end
+	return {type = "template", view = name, target = _template}
 end
 
---- Create a CBI model dispatching target.
--- @param	model	CBI model tpo be rendered
-function cbi(model)
-	return function(...)
-		require("luci.cbi")
-		require("luci.template")
 
-		maps = luci.cbi.load(model, ...)
+local function _cbi(self, ...)
+	local cbi = require "luci.cbi"
+	local tpl = require "luci.template"
+	local http = require "luci.http"
+
+	local config = self.config or {}
+	local maps = cbi.load(self.model, ...)
+
+	local state = nil
+
+	for i, res in ipairs(maps) do
+		res.flow = config
+		local cstate = res:parse()
+		if cstate and (not state or cstate < state) then
+			state = cstate
+		end
+	end
+
+	local function _resolve_path(path)
+		return type(path) == "table" and build_url(unpack(path)) or path
+	end
+
+	if config.on_valid_to and state and state > 0 and state < 2 then
+		http.redirect(_resolve_path(config.on_valid_to))
+		return
+	end
+
+	if config.on_changed_to and state and state > 1 then
+		http.redirect(_resolve_path(config.on_changed_to))
+		return
+	end
+
+	if config.on_success_to and state and state > 0 then
+		http.redirect(_resolve_path(config.on_success_to))
+		return
+	end
+
+	if config.state_handler then
+		if not config.state_handler(state, maps) then
+			return
+		end
+	end
+
+	http.header("X-CBI-State", state or 0)
 
-		for i, res in ipairs(maps) do
-			res:parse()
+	if not config.noheader then
+		tpl.render("cbi/header", {state = state})
+	end
+
+	local redirect
+	local messages
+	local applymap   = false
+	local pageaction = true
+	local parsechain = { }
+
+	for i, res in ipairs(maps) do
+		if res.apply_needed and res.parsechain then
+			local c
+			for _, c in ipairs(res.parsechain) do
+				parsechain[#parsechain+1] = c
+			end
+			applymap = true
 		end
 
-		luci.template.render("cbi/header")
-		for i, res in ipairs(maps) do
-			res:render()
+		if res.redirect then
+			redirect = redirect or res.redirect
 		end
-		luci.template.render("cbi/footer")
+
+		if res.pageaction == false then
+			pageaction = false
+		end
+
+		if res.message then
+			messages = messages or { }
+			messages[#messages+1] = res.message
+		end
+	end
+
+	for i, res in ipairs(maps) do
+		res:render({
+			firstmap   = (i == 1),
+			applymap   = applymap,
+			redirect   = redirect,
+			messages   = messages,
+			pageaction = pageaction,
+			parsechain = parsechain
+		})
+	end
+
+	if not config.nofooter then
+		tpl.render("cbi/footer", {
+			flow       = config,
+			pageaction = pageaction,
+			redirect   = redirect,
+			state      = state,
+			autoapply  = config.autoapply
+		})
 	end
 end
 
---- Create a CBI form model dispatching target.
--- @param	model	CBI form model tpo be rendered
-function form(model)
-	return function(...)
-		require("luci.cbi")
-		require("luci.template")
+--- Create a CBI model dispatching target.
+-- @param	model	CBI model to be rendered
+function cbi(model, config)
+	return {type = "cbi", config = config, model = model, target = _cbi}
+end
 
-		maps = luci.cbi.load(model, ...)
 
-		for i, res in ipairs(maps) do
-			res:parse()
-		end
+local function _arcombine(self, ...)
+	local argv = {...}
+	local target = #argv > 0 and self.targets[2] or self.targets[1]
+	setfenv(target.target, self.env)
+	target:target(unpack(argv))
+end
+
+--- Create a combined dispatching target for non argv and argv requests.
+-- @param trg1	Overview Target
+-- @param trg2	Detail Target
+function arcombine(trg1, trg2)
+	return {type = "arcombine", env = getfenv(), target = _arcombine, targets = {trg1, trg2}}
+end
+
+
+local function _form(self, ...)
+	local cbi = require "luci.cbi"
+	local tpl = require "luci.template"
+	local http = require "luci.http"
 
-		luci.template.render("header")
-		for i, res in ipairs(maps) do
-			res:render()
+	local maps = luci.cbi.load(self.model, ...)
+	local state = nil
+
+	for i, res in ipairs(maps) do
+		local cstate = res:parse()
+		if cstate and (not state or cstate < state) then
+			state = cstate
 		end
-		luci.template.render("footer")
 	end
+
+	http.header("X-CBI-State", state or 0)
+	tpl.render("header")
+	for i, res in ipairs(maps) do
+		res:render()
+	end
+	tpl.render("footer")
+end
+
+--- Create a CBI form model dispatching target.
+-- @param	model	CBI form model tpo be rendered
+function form(model)
+	return {type = "cbi", model = model, target = _form}
 end