libs/web/luasrc/dispatcher.lua

   1 --[[
   2 LuCI - Dispatcher
   3
   4 Description:
   5 The request dispatcher and module dispatcher generators
   6
   7 FileId:
   8 $Id$
   9
  10 License:
  11 Copyright 2008 Steven Barth <steven@midlink.org>
  12
  13 Licensed under the Apache License, Version 2.0 (the "License");
  14 you may not use this file except in compliance with the License.
  15 You may obtain a copy of the License at
  16
  17         http://www.apache.org/licenses/LICENSE-2.0
  18
  19 Unless required by applicable law or agreed to in writing, software
  20 distributed under the License is distributed on an "AS IS" BASIS,
  21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22 See the License for the specific language governing permissions and
  23 limitations under the License.
  24
  25 ]]--
  26 module("luci.dispatcher", package.seeall)
  27 require("luci.init")
  28 require("luci.http")
  29 require("luci.sys")
  30 require("luci.fs")
  31
  32 -- Dirty OpenWRT fix
  33 if (os.time() < 1000000000) then
  34         os.execute('date -s '..os.date('%m%d%H%M%Y', luci.fs.mtime(luci.sys.libpath() .. "/dispatcher.lua"))..' > /dev/null 2>&1')
  35 end
  36
  37 -- Local dispatch database
  38 local tree = {nodes={}}
  39
  40 -- Index table
  41 local index = {}
  42
  43 -- Global request object
  44 request = {}
  45
  46 -- Active dispatched node
  47 dispatched = nil
  48
  49 -- Status fields
  50 built_index = false
  51 built_tree  = false
  52
  53 -- Fastindex
  54 local fi
  55
  56
  57 -- Builds a URL
  58 function build_url(...)
  59         return luci.http.dispatcher() .. "/" .. table.concat(arg, "/")
  60 end
  61
  62 -- Prints an error message or renders the "error401" template if available
  63 function error401(message)
  64         message = message or "Unauthorized"
  65
  66         require("luci.template")
  67         if not pcall(luci.template.render, "error401") then
  68                 luci.http.prepare_content("text/plain")
  69                 print(message)
  70         end
  71         return false
  72 end
  73
  74 -- Sends a 404 error code and renders the "error404" template if available
  75 function error404(message)
  76         luci.http.status(404, "Not Found")
  77         message = message or "Not Found"
  78
  79         require("luci.template")
  80         if not pcall(luci.template.render, "error404") then
  81                 luci.http.prepare_content("text/plain")
  82                 print(message)
  83         end
  84         return false
  85 end
  86
  87 -- Sends a 500 error code and renders the "error500" template if available
  88 function error500(message)
  89         luci.http.status(500, "Internal Server Error")
  90
  91         require("luci.template")
  92         if not pcall(luci.template.render, "error500", {message=message}) then
  93                 luci.http.prepare_content("text/plain")
  94                 print(message)
  95         end
  96         return false
  97 end
  98
  99 -- Creates a request object for dispatching
 100 function httpdispatch()
 101         local pathinfo = luci.http.env.PATH_INFO or ""
 102
 103         for node in pathinfo:gmatch("[^/]+") do
 104                 table.insert(request, node)
 105         end
 106
 107         dispatch()
 108 end
 109
 110 -- Dispatches a request
 111 function dispatch()
 112         if not built_tree then
 113                 createtree()
 114         end
 115
 116         local c = tree
 117         local track = {}
 118
 119         for i, s in ipairs(request) do
 120                 c = c.nodes[s]
 121                 if not c or c.leaf then
 122                         break
 123                 end
 124
 125                 for k, v in pairs(c) do
 126                         track[k] = v
 127                 end
 128         end
 129
 130         if track.sysauth then
 131                 local accs = track.sysauth
 132                 accs = (type(accs) == "string") and {accs} or accs
 133
 134                 local function sysauth(user, password)
 135                         return (luci.util.contains(accs, user)
 136                                 and luci.sys.user.checkpasswd(user, password))
 137                 end
 138
 139                 if not luci.http.basic_auth(sysauth) then
 140                         error401()
 141                         return
 142                 end
 143         end
 144
 145         if track.i18n then
 146                 require("luci.i18n").loadc(track.i18n)
 147         end
 148
 149         if track.setgroup then
 150                 luci.sys.process.setgroup(track.setgroup)
 151         end
 152
 153         if track.setuser then
 154                 luci.sys.process.setuser(track.setuser)
 155         end
 156
 157         -- Init template engine
 158         local tpl = require("luci.template")
 159         tpl.viewns.translate   = function(...) return require("luci.i18n").translate(...) end
 160         tpl.viewns.controller  = luci.http.dispatcher()
 161         tpl.viewns.uploadctrl  = luci.http.dispatcher_upload()
 162         tpl.viewns.media       = luci.config.main.mediaurlbase
 163         tpl.viewns.resource    = luci.config.main.resourcebase
 164         tpl.viewns.uci         = require("luci.model.uci").config
 165         tpl.viewns.REQUEST_URI = luci.http.env.SCRIPT_NAME .. (luci.http.env.PATH_INFO or "")
 166
 167
 168         if c and type(c.target) == "function" then
 169                 dispatched = c
 170                 stat, mod = pcall(require, c.module)
 171                 if stat then
 172                         luci.util.updfenv(c.target, mod)
 173                 end
 174
 175                 stat, err = pcall(c.target)
 176                 if not stat then
 177                         error500(err)
 178                 end
 179         else
 180                 error404()
 181         end
 182 end
 183
 184 -- Generates the dispatching tree
 185 function createindex()
 186         index = {}
 187         local path = luci.sys.libpath() .. "/controller/"
 188         local suff = ".lua"
 189
 190         if pcall(require, "luci.fastindex") then
 191                 createindex_fastindex(path, suff)
 192         else
 193                 createindex_plain(path, suff)
 194         end
 195
 196         built_index = true
 197 end
 198
 199 -- Uses fastindex to create the dispatching tree
 200 function createindex_fastindex(path, suffix)
 201         if not fi then
 202                 fi = luci.fastindex.new("index")
 203                 fi.add(path .. "*" .. suffix)
 204                 fi.add(path .. "*/*" .. suffix)
 205         end
 206         fi.scan()
 207
 208         for k, v in pairs(fi.indexes) do
 209                 index[v[2]] = v[1]
 210         end
 211 end
 212
 213 -- Calls the index function of all available controllers
 214 -- Fallback for transition purposes / Leave it in as long as it works otherwise throw it away
 215 function createindex_plain(path, suffix)
 216         if built_index then
 217                 return
 218         end
 219
 220         local cache = nil
 221
 222         local controllers = luci.util.combine(
 223                 luci.fs.glob(path .. "*" .. suffix) or {},
 224                 luci.fs.glob(path .. "*/*" .. suffix) or {}
 225         )
 226
 227         if indexcache then
 228                 cache = luci.fs.mtime(indexcache)
 229
 230                 if not cache then
 231                         luci.fs.mkdir(indexcache)
 232                         luci.fs.chmod(indexcache, "a=,u=rwx")
 233                         cache = luci.fs.mtime(indexcache)
 234                 end
 235         end
 236
 237         for i,c in ipairs(controllers) do
 238                 local module = "luci.controller." .. c:sub(#path+1, #c-#suffix):gsub("/", ".")
 239                 local cachefile
 240                 local stime
 241                 local ctime
 242
 243                 if cache then
 244                         cachefile = indexcache .. "/" .. module
 245                         stime = luci.fs.mtime(c) or 0
 246                         ctime = luci.fs.mtime(cachefile) or 0
 247                 end
 248
 249                 if not cache or stime > ctime then
 250                         stat, mod = pcall(require, module)
 251
 252                         if stat and mod and type(mod.index) == "function" then
 253                                 index[module] = mod.index
 254
 255                                 if cache then
 256                                         luci.fs.writefile(cachefile, luci.util.dump(mod.index))
 257                                 end
 258                         end
 259                 else
 260                         index[module] = loadfile(cachefile)
 261                 end
 262         end
 263 end
 264
 265 -- Creates the dispatching tree from the index
 266 function createtree()
 267         if not built_index then
 268                 createindex()
 269         end
 270
 271         require("luci.i18n")
 272
 273         -- Load default translation
 274         luci.i18n.loadc("default")
 275
 276         local scope = luci.util.clone(_G)
 277         for k,v in pairs(_M) do
 278                 if type(v) == "function" then
 279                         scope[k] = v
 280                 end
 281         end
 282
 283         for k, v in pairs(index) do
 284                 scope._NAME = k
 285                 setfenv(v, scope)
 286
 287                 local stat, err = pcall(v)
 288                 if not stat then
 289                         error500(err)
 290                         os.exit(1)
 291                 end
 292         end
 293
 294         built_tree = true
 295 end
 296
 297 -- Reassigns a node to another position
 298 function assign(path, clone, title, order)
 299         local obj  = node(path)
 300         obj.nodes  = nil
 301         obj.module = nil
 302
 303         obj.title = title
 304         obj.order = order
 305
 306         local c = tree
 307         for k, v in ipairs(clone) do
 308                 if not c.nodes[v] then
 309                         c.nodes[v] = {nodes={}}
 310                 end
 311
 312                 c = c.nodes[v]
 313         end
 314
 315         setmetatable(obj, {__index = c})
 316
 317         return obj
 318 end
 319
 320 -- Shortcut for creating a dispatching node
 321 function entry(path, target, title, order)
 322         local c = node(path)
 323
 324         c.target = target
 325         c.title  = title
 326         c.order  = order
 327         c.module = getfenv(2)._NAME
 328
 329         return c
 330 end
 331
 332 -- Fetch a dispatching node
 333 function node(...)
 334         local c = tree
 335
 336         arg.n = nil
 337         if arg[1] then
 338                 if type(arg[1]) == "table" then
 339                         arg = arg[1]
 340                 end
 341         end
 342
 343         for k,v in ipairs(arg) do
 344                 if not c.nodes[v] then
 345                         c.nodes[v] = {nodes={}}
 346                 end
 347
 348                 c = c.nodes[v]
 349         end
 350
 351         c.module = getfenv(2)._NAME
 352         c.path = arg
 353
 354         return c
 355 end
 356
 357 -- Subdispatchers --
 358 function alias(...)
 359         local req = arg
 360         return function()
 361                 request = req
 362                 dispatch()
 363         end
 364 end
 365
 366 function rewrite(n, ...)
 367         local req = arg
 368         return function()
 369                 for i=1,n do
 370                         table.remove(request, 1)
 371                 end
 372
 373                 for i,r in ipairs(req) do
 374                         table.insert(request, i, r)
 375                 end
 376
 377                 dispatch()
 378         end
 379 end
 380
 381 function call(name)
 382         return function() getfenv()[name]() end
 383 end
 384
 385 function template(name)
 386         require("luci.template")
 387         return function() luci.template.render(name) end
 388 end
 389
 390 function cbi(model)
 391         require("luci.cbi")
 392         require("luci.template")
 393
 394         return function()
 395                 local stat, res = pcall(luci.cbi.load, model)
 396                 if not stat then
 397                         error500(res)
 398                         return true
 399                 end
 400
 401                 local stat, err = pcall(res.parse, res)
 402                 if not stat then
 403                         error500(err)
 404                         return true
 405                 end
 406
 407                 luci.template.render("cbi/header")
 408                 res:render()
 409                 luci.template.render("cbi/footer")
 410         end
 411 end