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
  27 --- LuCI web dispatcher.
  28 local fs = require "luci.fs"
  29 local sys = require "luci.sys"
  30 local init = require "luci.init"
  31 local util = require "luci.util"
  32 local http = require "luci.http"
  33
  34 module("luci.dispatcher", package.seeall)
  35 context = luci.util.threadlocal()
  36
  37 authenticator = {}
  38
  39 -- Index table
  40 local index = nil
  41
  42 -- Fastindex
  43 local fi
  44
  45
  46 --- Build the URL relative to the server webroot from given virtual path.
  47 -- @param ...   Virtual path
  48 -- @return              Relative URL
  49 function build_url(...)
  50         return luci.http.getenv("SCRIPT_NAME") .. "/" .. table.concat(arg, "/")
  51 end
  52
  53 --- Send a 404 error code and render the "error404" template if available.
  54 -- @param message       Custom error message (optional)
  55 -- @return                      false
  56 function error404(message)
  57         luci.http.status(404, "Not Found")
  58         message = message or "Not Found"
  59
  60         require("luci.template")
  61         if not luci.util.copcall(luci.template.render, "error404") then
  62                 luci.http.prepare_content("text/plain")
  63                 luci.http.write(message)
  64         end
  65         return false
  66 end
  67
  68 --- Send a 500 error code and render the "error500" template if available.
  69 -- @param message       Custom error message (optional)#
  70 -- @return                      false
  71 function error500(message)
  72         luci.http.status(500, "Internal Server Error")
  73
  74         require("luci.template")
  75         if not luci.util.copcall(luci.template.render, "error500", {message=message}) then
  76                 luci.http.prepare_content("text/plain")
  77                 luci.http.write(message)
  78         end
  79         return false
  80 end
  81
  82 function authenticator.htmlauth(validator, accs, default)
  83         local user = luci.http.formvalue("username")
  84         local pass = luci.http.formvalue("password")
  85
  86         if user and validator(user, pass) then
  87                 return user
  88         end
  89
  90         require("luci.i18n")
  91         require("luci.template")
  92         context.path = {}
  93         luci.template.render("sysauth", {duser=default, fuser=user})
  94         return false
  95
  96 end
  97
  98 --- Dispatch an HTTP request.
  99 -- @param request       LuCI HTTP Request object
 100 function httpdispatch(request)
 101         luci.http.context.request = request
 102         context.request = {}
 103         local pathinfo = request:getenv("PATH_INFO") or ""
 104
 105         for node in pathinfo:gmatch("[^/]+") do
 106                 table.insert(context.request, node)
 107         end
 108
 109         local stat, err = util.copcall(dispatch, context.request)
 110         if not stat then
 111                 luci.util.perror(err)
 112                 error500(err)
 113         end
 114
 115         luci.http.close()
 116
 117         --context._disable_memtrace()
 118 end
 119
 120 --- Dispatches a LuCI virtual path.
 121 -- @param request       Virtual path
 122 function dispatch(request)
 123         --context._disable_memtrace = require "luci.debug".trap_memtrace()
 124         local ctx = context
 125         ctx.path = request
 126
 127         require "luci.i18n".setlanguage(require "luci.config".main.lang)
 128
 129         local c = ctx.tree
 130         local stat
 131         if not c then
 132                 c = createtree()
 133         end
 134
 135         local track = {}
 136         local args = {}
 137         ctx.args = args
 138         ctx.requestargs = ctx.requestargs or args
 139         local n
 140
 141         for i, s in ipairs(request) do
 142                 c = c.nodes[s]
 143                 n = i
 144                 if not c then
 145                         break
 146                 end
 147
 148                 util.update(track, c)
 149
 150                 if c.leaf then
 151                         break
 152                 end
 153         end
 154
 155         if c and c.leaf then
 156                 for j=n+1, #request do
 157                         table.insert(args, request[j])
 158                 end
 159         end
 160
 161         if track.i18n then
 162                 require("luci.i18n").loadc(track.i18n)
 163         end
 164
 165         -- Init template engine
 166         if (c and c.index) or not track.notemplate then
 167                 local tpl = require("luci.template")
 168                 local media = track.mediaurlbase or luci.config.main.mediaurlbase
 169                 if not pcall(tpl.Template, "themes/%s/header" % fs.basename(media)) then
 170                         media = nil
 171                         for name, theme in pairs(luci.config.themes) do
 172                                 if name:sub(1,1) ~= "." and pcall(tpl.Template,
 173                                  "themes/%s/header" % fs.basename(theme)) then
 174                                         media = theme
 175                                 end
 176                         end
 177                         assert(media, "No valid theme found")
 178                 end
 179
 180                 local viewns = setmetatable({}, {__index=_G})
 181                 tpl.context.viewns = viewns
 182                 viewns.write       = luci.http.write
 183                 viewns.include     = function(name) tpl.Template(name):render(getfenv(2)) end
 184                 viewns.translate   = function(...) return require("luci.i18n").translate(...) end
 185                 viewns.striptags   = util.striptags
 186                 viewns.controller  = luci.http.getenv("SCRIPT_NAME")
 187                 viewns.media       = media
 188                 viewns.theme       = fs.basename(media)
 189                 viewns.resource    = luci.config.main.resourcebase
 190                 viewns.REQUEST_URI = (luci.http.getenv("SCRIPT_NAME") or "") .. (luci.http.getenv("PATH_INFO") or "")
 191         end
 192
 193         track.dependent = (track.dependent ~= false)
 194         assert(not track.dependent or not track.auto, "Access Violation")
 195
 196         if track.sysauth then
 197                 local sauth = require "luci.sauth"
 198
 199                 local authen = type(track.sysauth_authenticator) == "function"
 200                  and track.sysauth_authenticator
 201                  or authenticator[track.sysauth_authenticator]
 202
 203                 local def  = (type(track.sysauth) == "string") and track.sysauth
 204                 local accs = def and {track.sysauth} or track.sysauth
 205                 local sess = ctx.authsession or luci.http.getcookie("sysauth")
 206                 sess = sess and sess:match("^[A-F0-9]+$")
 207                 local user = sauth.read(sess)
 208
 209                 if not util.contains(accs, user) then
 210                         if authen then
 211                                 local user, sess = authen(luci.sys.user.checkpasswd, accs, def)
 212                                 if not user or not util.contains(accs, user) then
 213                                         return
 214                                 else
 215                                         local sid = sess or luci.sys.uniqueid(16)
 216                                         luci.http.header("Set-Cookie", "sysauth=" .. sid.."; path=/")
 217                                         if not sess then
 218                                                 sauth.write(sid, user)
 219                                         end
 220                                         ctx.authsession = sid
 221                                 end
 222                         else
 223                                 luci.http.status(403, "Forbidden")
 224                                 return
 225                         end
 226                 end
 227         end
 228
 229         if track.setgroup then
 230                 luci.sys.process.setgroup(track.setgroup)
 231         end
 232
 233         if track.setuser then
 234                 luci.sys.process.setuser(track.setuser)
 235         end
 236
 237         if c and (c.index or type(c.target) == "function") then
 238                 ctx.dispatched = c
 239                 ctx.requested = ctx.requested or ctx.dispatched
 240         end
 241
 242         if c and c.index then
 243                 local tpl = require "luci.template"
 244
 245                 if util.copcall(tpl.render, "indexer", {}) then
 246                         return true
 247                 end
 248         end
 249
 250         if c and type(c.target) == "function" then
 251                 util.copcall(function()
 252                         local oldenv = getfenv(c.target)
 253                         local module = require(c.module)
 254                         local env = setmetatable({}, {__index=
 255
 256                         function(tbl, key)
 257                                 return rawget(tbl, key) or module[key] or oldenv[key]
 258                         end})
 259
 260                         setfenv(c.target, env)
 261                 end)
 262
 263                 c.target(unpack(args))
 264         else
 265                 error404()
 266         end
 267 end
 268
 269 --- Generate the dispatching index using the best possible strategy.
 270 function createindex()
 271         local path = luci.util.libpath() .. "/controller/"
 272         local suff = ".lua"
 273
 274         if luci.util.copcall(require, "luci.fastindex") then
 275                 createindex_fastindex(path, suff)
 276         else
 277                 createindex_plain(path, suff)
 278         end
 279 end
 280
 281 --- Generate the dispatching index using the fastindex C-indexer.
 282 -- @param path          Controller base directory
 283 -- @param suffix        Controller file suffix
 284 function createindex_fastindex(path, suffix)
 285         index = {}
 286
 287         if not fi then
 288                 fi = luci.fastindex.new("index")
 289                 fi.add(path .. "*" .. suffix)
 290                 fi.add(path .. "*/*" .. suffix)
 291         end
 292         fi.scan()
 293
 294         for k, v in pairs(fi.indexes) do
 295                 index[v[2]] = v[1]
 296         end
 297 end
 298
 299 --- Generate the dispatching index using the native file-cache based strategy.
 300 -- @param path          Controller base directory
 301 -- @param suffix        Controller file suffix
 302 function createindex_plain(path, suffix)
 303         local controllers = util.combine(
 304                 luci.fs.glob(path .. "*" .. suffix) or {},
 305                 luci.fs.glob(path .. "*/*" .. suffix) or {}
 306         )
 307
 308         if indexcache then
 309                 local cachedate = fs.mtime(indexcache)
 310                 if cachedate then
 311                         local realdate = 0
 312                         for _, obj in ipairs(controllers) do
 313                                 local omtime = fs.mtime(path .. "/" .. obj)
 314                                 realdate = (omtime and omtime > realdate) and omtime or realdate
 315                         end
 316
 317                         if cachedate > realdate then
 318                                 assert(
 319                                         sys.process.info("uid") == fs.stat(indexcache, "uid")
 320                                         and fs.stat(indexcache, "mode") == "rw-------",
 321                                         "Fatal: Indexcache is not sane!"
 322                                 )
 323
 324                                 index = loadfile(indexcache)()
 325                                 return index
 326                         end
 327                 end
 328         end
 329
 330         index = {}
 331
 332         for i,c in ipairs(controllers) do
 333                 local module = "luci.controller." .. c:sub(#path+1, #c-#suffix):gsub("/", ".")
 334                 local mod = require(module)
 335                 local idx = mod.index
 336
 337                 if type(idx) == "function" then
 338                         index[module] = idx
 339                 end
 340         end
 341
 342         if indexcache then
 343                 fs.writefile(indexcache, util.get_bytecode(index))
 344                 fs.chmod(indexcache, "a-rwx,u+rw")
 345         end
 346 end
 347
 348 --- Create the dispatching tree from the index.
 349 -- Build the index before if it does not exist yet.
 350 function createtree()
 351         if not index then
 352                 createindex()
 353         end
 354
 355         local ctx  = context
 356         local tree = {nodes={}}
 357
 358         ctx.treecache = setmetatable({}, {__mode="v"})
 359         ctx.tree = tree
 360
 361         -- Load default translation
 362         require "luci.i18n".loadc("default")
 363
 364         local scope = setmetatable({}, {__index = luci.dispatcher})
 365
 366         for k, v in pairs(index) do
 367                 scope._NAME = k
 368                 setfenv(v, scope)
 369                 v()
 370         end
 371
 372         return tree
 373 end
 374
 375 --- Clone a node of the dispatching tree to another position.
 376 -- @param       path    Virtual path destination
 377 -- @param       clone   Virtual path source
 378 -- @param       title   Destination node title (optional)
 379 -- @param       order   Destination node order value (optional)
 380 -- @return                      Dispatching tree node
 381 function assign(path, clone, title, order)
 382         local obj  = node(unpack(path))
 383         obj.nodes  = nil
 384         obj.module = nil
 385
 386         obj.title = title
 387         obj.order = order
 388
 389         setmetatable(obj, {__index = _create_node(clone)})
 390
 391         return obj
 392 end
 393
 394 --- Create a new dispatching node and define common parameters.
 395 -- @param       path    Virtual path
 396 -- @param       target  Target function to call when dispatched.
 397 -- @param       title   Destination node title
 398 -- @param       order   Destination node order value (optional)
 399 -- @return                      Dispatching tree node
 400 function entry(path, target, title, order)
 401         local c = node(unpack(path))
 402
 403         c.target = target
 404         c.title  = title
 405         c.order  = order
 406         c.module = getfenv(2)._NAME
 407
 408         return c
 409 end
 410
 411 --- Fetch or create a new dispatching node.
 412 -- @param       ...             Virtual path
 413 -- @return                      Dispatching tree node
 414 function node(...)
 415         local c = _create_node({...})
 416
 417         c.module = getfenv(2)._NAME
 418         c.path = arg
 419         c.auto = nil
 420
 421         return c
 422 end
 423
 424 function _create_node(path, cache)
 425         if #path == 0 then
 426                 return context.tree
 427         end
 428
 429         cache = cache or context.treecache
 430         local name = table.concat(path, ".")
 431         local c = cache[name]
 432
 433         if not c then
 434                 local last = table.remove(path)
 435                 c = _create_node(path, cache)
 436
 437                 local new = {nodes={}, auto=true}
 438                 c.nodes[last] = new
 439                 cache[name] = new
 440
 441                 return new
 442         else
 443                 return c
 444         end
 445 end
 446
 447 -- Subdispatchers --
 448
 449 --- Create a redirect to another dispatching node.
 450 -- @param       ...             Virtual path destination
 451 function alias(...)
 452         local req = {...}
 453         return function(...)
 454                 for _, r in ipairs({...}) do
 455                         req[#req+1] = r
 456                 end
 457
 458                 dispatch(req)
 459         end
 460 end
 461
 462 --- Rewrite the first x path values of the request.
 463 -- @param       n               Number of path values to replace
 464 -- @param       ...             Virtual path to replace removed path values with
 465 function rewrite(n, ...)
 466         local req = {...}
 467         return function(...)
 468                 local dispatched = util.clone(context.dispatched)
 469
 470                 for i=1,n do
 471                         table.remove(dispatched, 1)
 472                 end
 473
 474                 for i, r in ipairs(req) do
 475                         table.insert(dispatched, i, r)
 476                 end
 477
 478                 for _, r in ipairs({...}) do
 479                         dispatched[#dispatched+1] = r
 480                 end
 481
 482                 dispatch(dispatched)
 483         end
 484 end
 485
 486 --- Create a function-call dispatching target.
 487 -- @param       name    Target function of local controller
 488 -- @param       ...             Additional parameters passed to the function
 489 function call(name, ...)
 490         local argv = {...}
 491         return function(...)
 492                 if #argv > 0 then
 493                         return getfenv()[name](unpack(argv), ...)
 494                 else
 495                         return getfenv()[name](...)
 496                 end
 497         end
 498 end
 499
 500 --- Create a template render dispatching target.
 501 -- @param       name    Template to be rendered
 502 function template(name)
 503         return function()
 504                 require("luci.template")
 505                 luci.template.render(name)
 506         end
 507 end
 508
 509 --- Create a CBI model dispatching target.
 510 -- @param       model   CBI model to be rendered
 511 function cbi(model, config)
 512         config = config or {}
 513         return function(...)
 514                 require("luci.cbi")
 515                 require("luci.template")
 516                 local http = require "luci.http"
 517
 518                 maps = luci.cbi.load(model, ...)
 519
 520                 local state = nil
 521
 522                 for i, res in ipairs(maps) do
 523                         if config.autoapply then
 524                                 res.autoapply = config.autoapply
 525                         end
 526                         local cstate = res:parse()
 527                         if not state or cstate < state then
 528                                 state = cstate
 529                         end
 530                 end
 531
 532                 if config.on_success_to and state and state > 0 then
 533                         luci.http.redirect(config.on_success_to)
 534                         return
 535                 end
 536
 537                 if config.state_handler then
 538                         if not config.state_handler(state, maps) then
 539                                 return
 540                         end
 541                 end
 542
 543                 local pageaction = true
 544                 http.header("X-CBI-State", state or 0)
 545                 luci.template.render("cbi/header", {state = state})
 546                 for i, res in ipairs(maps) do
 547                         res:render()
 548                         if res.pageaction == false then
 549                                 pageaction = false
 550                         end
 551                 end
 552                 luci.template.render("cbi/footer", {pageaction=pageaction, state = state, autoapply = config.autoapply})
 553         end
 554 end
 555
 556 --- Create a CBI form model dispatching target.
 557 -- @param       model   CBI form model tpo be rendered
 558 function form(model)
 559         return function(...)
 560                 require("luci.cbi")
 561                 require("luci.template")
 562                 local http = require "luci.http"
 563
 564                 maps = luci.cbi.load(model, ...)
 565
 566                 local state = nil
 567
 568                 for i, res in ipairs(maps) do
 569                         local cstate = res:parse()
 570                         if not state or cstate < state then
 571                                 state = cstate
 572                         end
 573                 end
 574
 575                 http.header("X-CBI-State", state or 0)
 576                 luci.template.render("header")
 577                 for i, res in ipairs(maps) do
 578                         res:render()
 579                 end
 580                 luci.template.render("footer")
 581         end
 582 end