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--[[
LuCI - Dispatcher
Description:
The request dispatcher and module dispatcher generators
FileId:
$Id$
License:
Copyright 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
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
module("luci.dispatcher", package.seeall)
require("luci.http")
require("luci.sys")
require("luci.fs")
-- Local dispatch database
local tree = {nodes={}}
-- Global request object
request = {}
-- Active dispatched node
dispatched = nil
-- Builds a URL
function build_url(...)
return luci.http.dispatcher() .. "/" .. table.concat(arg, "/")
end
-- Sends a 404 error code and renders the "error404" template if available
function error404(message)
luci.http.status(404, "Not Found")
message = message or "Not Found"
require("luci.template")
if not pcall(luci.template.render, "error404") then
luci.http.prepare_content("text/plain")
print(message)
end
return false
end
-- Sends a 500 error code and renders the "error500" template if available
function error500(message)
luci.http.status(500, "Internal Server Error")
require("luci.template")
if not pcall(luci.template.render, "error500", {message=message}) then
luci.http.prepare_content("text/plain")
print(message)
end
return false
end
-- Dispatches a request depending on the PATH_INFO variable
function httpdispatch()
local pathinfo = luci.http.env.PATH_INFO or ""
local c = tree
for s in pathinfo:gmatch("/([%w-]+)") do
table.insert(request, s)
end
dispatch()
end
function dispatch()
local c = tree
local track = {}
for i, s in ipairs(request) do
c = c.nodes[s]
if not c then
break
end
for k, v in pairs(c) do
track[k] = v
end
end
if track.i18n then
require("luci.i18n").loadc(track.i18n)
end
if track.setgroup then
luci.sys.process.setgroup(track.setgroup)
end
if track.setuser then
luci.sys.process.setuser(track.setuser)
end
if c and type(c.target) == "function" then
dispatched = c
stat, err = pcall(c.target)
if not stat then
error500(err)
end
else
error404()
end
end
-- Calls the index function of all available controllers
function createindex()
local root = luci.sys.libpath() .. "/controller/"
local suff = ".lua"
local controllers = luci.util.combine(
luci.fs.glob(root .. "*" .. suff),
luci.fs.glob(root .. "*/*" .. suff)
)
for i,c in ipairs(controllers) do
c = "luci.controller." .. c:sub(#root+1, #c-#suff):gsub("/", ".")
stat, mod = pcall(require, c)
if stat and mod and type(mod.index) == "function" then
luci.util.updfenv(mod.index, luci.dispatcher)
pcall(mod.index)
end
end
end
-- Shortcut for creating a dispatching node
function entry(path, target, title, order, add)
add = add or {}
local c = node(path)
c.target = target
c.title = title
c.order = order
for k,v in pairs(add) do
c[k] = v
end
return c
end
-- Fetch a dispatching node
function node(...)
local c = tree
if arg[1] and type(arg[1]) == "table" then
arg = arg[1]
end
for k,v in ipairs(arg) do
if not c.nodes[v] then
c.nodes[v] = {nodes={}}
end
c = c.nodes[v]
end
return c
end
-- Subdispatchers --
function alias(...)
local req = arg
return function()
request = req
dispatch()
end
end
function template(name)
require("luci.template")
return function() luci.template.render(name) end
end
function cbi(model)
require("luci.cbi")
require("luci.template")
return function()
local stat, res = pcall(luci.cbi.load, model)
if not stat then
error500(res)
return true
end
local stat, err = pcall(res.parse, res)
if not stat then
error500(err)
return true
end
luci.template.render("cbi/header")
res:render()
luci.template.render("cbi/footer")
end
end
|
