modules/luci-base/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 "nixio.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 local nixio = require "nixio", require "nixio.util"
  34
  35 module("luci.dispatcher", package.seeall)
  36 context = util.threadlocal()
  37 uci = require "luci.model.uci"
  38 i18n = require "luci.i18n"
  39 _M.fs = fs
  40
  41 authenticator = {}
  42
  43 -- Index table
  44 local index = nil
  45
  46 -- Fastindex
  47 local fi
  48
  49
  50 --- Build the URL relative to the server webroot from given virtual path.
  51 -- @param ...   Virtual path
  52 -- @return              Relative URL
  53 function build_url(...)
  54         local path = {...}
  55         local url = { http.getenv("SCRIPT_NAME") or "" }
  56
  57         local k, v
  58         for k, v in pairs(context.urltoken) do
  59                 url[#url+1] = "/;"
  60                 url[#url+1] = http.urlencode(k)
  61                 url[#url+1] = "="
  62                 url[#url+1] = http.urlencode(v)
  63         end
  64
  65         local p
  66         for _, p in ipairs(path) do
  67                 if p:match("^[a-zA-Z0-9_%-%.%%/,;]+$") then
  68                         url[#url+1] = "/"
  69                         url[#url+1] = p
  70                 end
  71         end
  72
  73         return table.concat(url, "")
  74 end
  75
  76 --- Check whether a dispatch node shall be visible
  77 -- @param node  Dispatch node
  78 -- @return              Boolean indicating whether the node should be visible
  79 function node_visible(node)
  80    if node then
  81           return not (
  82                  (not node.title or #node.title == 0) or
  83                  (not node.target or node.hidden == true) or
  84                  (type(node.target) == "table" and node.target.type == "firstchild" and
  85                   (type(node.nodes) ~= "table" or not next(node.nodes)))
  86           )
  87    end
  88    return false
  89 end
  90
  91 --- Return a sorted table of visible childs within a given node
  92 -- @param node  Dispatch node
  93 -- @return              Ordered table of child node names
  94 function node_childs(node)
  95         local rv = { }
  96         if node then
  97                 local k, v
  98                 for k, v in util.spairs(node.nodes,
  99                         function(a, b)
 100                                 return (node.nodes[a].order or 100)
 101                                      < (node.nodes[b].order or 100)
 102                         end)
 103                 do
 104                         if node_visible(v) then
 105                                 rv[#rv+1] = k
 106                         end
 107                 end
 108         end
 109         return rv
 110 end
 111
 112
 113 --- Send a 404 error code and render the "error404" template if available.
 114 -- @param message       Custom error message (optional)
 115 -- @return                      false
 116 function error404(message)
 117         http.status(404, "Not Found")
 118         message = message or "Not Found"
 119
 120         require("luci.template")
 121         if not util.copcall(luci.template.render, "error404") then
 122                 http.prepare_content("text/plain")
 123                 http.write(message)
 124         end
 125         return false
 126 end
 127
 128 --- Send a 500 error code and render the "error500" template if available.
 129 -- @param message       Custom error message (optional)#
 130 -- @return                      false
 131 function error500(message)
 132         util.perror(message)
 133         if not context.template_header_sent then
 134                 http.status(500, "Internal Server Error")
 135                 http.prepare_content("text/plain")
 136                 http.write(message)
 137         else
 138                 require("luci.template")
 139                 if not util.copcall(luci.template.render, "error500", {message=message}) then
 140                         http.prepare_content("text/plain")
 141                         http.write(message)
 142                 end
 143         end
 144         return false
 145 end
 146
 147 function authenticator.htmlauth(validator, accs, default)
 148         local user = http.formvalue("luci_username")
 149         local pass = http.formvalue("luci_password")
 150
 151         if user and validator(user, pass) then
 152                 return user
 153         end
 154
 155         require("luci.i18n")
 156         require("luci.template")
 157         context.path = {}
 158         luci.template.render("sysauth", {duser=default, fuser=user})
 159         return false
 160
 161 end
 162
 163 --- Dispatch an HTTP request.
 164 -- @param request       LuCI HTTP Request object
 165 function httpdispatch(request, prefix)
 166         http.context.request = request
 167
 168         local r = {}
 169         context.request = r
 170         context.urltoken = {}
 171
 172         local pathinfo = http.urldecode(request:getenv("PATH_INFO") or "", true)
 173
 174         if prefix then
 175                 for _, node in ipairs(prefix) do
 176                         r[#r+1] = node
 177                 end
 178         end
 179
 180         local tokensok = true
 181         for node in pathinfo:gmatch("[^/]+") do
 182                 local tkey, tval
 183                 if tokensok then
 184                         tkey, tval = node:match(";(%w+)=([a-fA-F0-9]*)")
 185                 end
 186                 if tkey then
 187                         context.urltoken[tkey] = tval
 188                 else
 189                         tokensok = false
 190                         r[#r+1] = node
 191                 end
 192         end
 193
 194         local stat, err = util.coxpcall(function()
 195                 dispatch(context.request)
 196         end, error500)
 197
 198         http.close()
 199
 200         --context._disable_memtrace()
 201 end
 202
 203 --- Dispatches a LuCI virtual path.
 204 -- @param request       Virtual path
 205 function dispatch(request)
 206         --context._disable_memtrace = require "luci.debug".trap_memtrace("l")
 207         local ctx = context
 208         ctx.path = request
 209
 210         local conf = require "luci.config"
 211         assert(conf.main,
 212                 "/etc/config/luci seems to be corrupt, unable to find section 'main'")
 213
 214         local lang = conf.main.lang or "auto"
 215         if lang == "auto" then
 216                 local aclang = http.getenv("HTTP_ACCEPT_LANGUAGE") or ""
 217                 for lpat in aclang:gmatch("[%w-]+") do
 218                         lpat = lpat and lpat:gsub("-", "_")
 219                         if conf.languages[lpat] then
 220                                 lang = lpat
 221                                 break
 222                         end
 223                 end
 224         end
 225         require "luci.i18n".setlanguage(lang)
 226
 227         local c = ctx.tree
 228         local stat
 229         if not c then
 230                 c = createtree()
 231         end
 232
 233         local track = {}
 234         local args = {}
 235         ctx.args = args
 236         ctx.requestargs = ctx.requestargs or args
 237         local n
 238         local token = ctx.urltoken
 239         local preq = {}
 240         local freq = {}
 241
 242         for i, s in ipairs(request) do
 243                 preq[#preq+1] = s
 244                 freq[#freq+1] = s
 245                 c = c.nodes[s]
 246                 n = i
 247                 if not c then
 248                         break
 249                 end
 250
 251                 util.update(track, c)
 252
 253                 if c.leaf then
 254                         break
 255                 end
 256         end
 257
 258         if c and c.leaf then
 259                 for j=n+1, #request do
 260                         args[#args+1] = request[j]
 261                         freq[#freq+1] = request[j]
 262                 end
 263         end
 264
 265         ctx.requestpath = ctx.requestpath or freq
 266         ctx.path = preq
 267
 268         if track.i18n then
 269                 i18n.loadc(track.i18n)
 270         end
 271
 272         -- Init template engine
 273         if (c and c.index) or not track.notemplate then
 274                 local tpl = require("luci.template")
 275                 local media = track.mediaurlbase or luci.config.main.mediaurlbase
 276                 if not pcall(tpl.Template, "themes/%s/header" % fs.basename(media)) then
 277                         media = nil
 278                         for name, theme in pairs(luci.config.themes) do
 279                                 if name:sub(1,1) ~= "." and pcall(tpl.Template,
 280                                  "themes/%s/header" % fs.basename(theme)) then
 281                                         media = theme
 282                                 end
 283                         end
 284                         assert(media, "No valid theme found")
 285                 end
 286
 287                 local function _ifattr(cond, key, val)
 288                         if cond then
 289                                 local env = getfenv(3)
 290                                 local scope = (type(env.self) == "table") and env.self
 291                                 return string.format(
 292                                         ' %s="%s"', tostring(key),
 293                                         util.pcdata(tostring( val
 294                                          or (type(env[key]) ~= "function" and env[key])
 295                                          or (scope and type(scope[key]) ~= "function" and scope[key])
 296                                          or "" ))
 297                                 )
 298                         else
 299                                 return ''
 300                         end
 301                 end
 302
 303                 tpl.context.viewns = setmetatable({
 304                    write       = http.write;
 305                    include     = function(name) tpl.Template(name):render(getfenv(2)) end;
 306                    translate   = i18n.translate;
 307                    translatef  = i18n.translatef;
 308                    export      = function(k, v) if tpl.context.viewns[k] == nil then tpl.context.viewns[k] = v end end;
 309                    striptags   = util.striptags;
 310                    pcdata      = util.pcdata;
 311                    media       = media;
 312                    theme       = fs.basename(media);
 313                    resource    = luci.config.main.resourcebase;
 314                    ifattr      = function(...) return _ifattr(...) end;
 315                    attr        = function(...) return _ifattr(true, ...) end;
 316                 }, {__index=function(table, key)
 317                         if key == "controller" then
 318                                 return build_url()
 319                         elseif key == "REQUEST_URI" then
 320                                 return build_url(unpack(ctx.requestpath))
 321                         else
 322                                 return rawget(table, key) or _G[key]
 323                         end
 324                 end})
 325         end
 326
 327         track.dependent = (track.dependent ~= false)
 328         assert(not track.dependent or not track.auto,
 329                 "Access Violation\nThe page at '" .. table.concat(request, "/") .. "/' " ..
 330                 "has no parent node so the access to this location has been denied.\n" ..
 331                 "This is a software bug, please report this message at " ..
 332                 "http://luci.subsignal.org/trac/newticket"
 333         )
 334
 335         if track.sysauth then
 336                 local authen = type(track.sysauth_authenticator) == "function"
 337                  and track.sysauth_authenticator
 338                  or authenticator[track.sysauth_authenticator]
 339
 340                 local def  = (type(track.sysauth) == "string") and track.sysauth
 341                 local accs = def and {track.sysauth} or track.sysauth
 342                 local sess = ctx.authsession
 343                 local verifytoken = false
 344                 if not sess then
 345                         sess = http.getcookie("sysauth")
 346                         sess = sess and sess:match("^[a-f0-9]*$")
 347                         verifytoken = true
 348                 end
 349
 350                 local sdat = (util.ubus("session", "get", { ubus_rpc_session = sess }) or { }).values
 351                 local user
 352
 353                 if sdat then
 354                         if not verifytoken or ctx.urltoken.stok == sdat.token then
 355                                 user = sdat.user
 356                         end
 357                 else
 358                         local eu = http.getenv("HTTP_AUTH_USER")
 359                         local ep = http.getenv("HTTP_AUTH_PASS")
 360                         if eu and ep and luci.sys.user.checkpasswd(eu, ep) then
 361                                 authen = function() return eu end
 362                         end
 363                 end
 364
 365                 if not util.contains(accs, user) then
 366                         if authen then
 367                                 ctx.urltoken.stok = nil
 368                                 local user, sess = authen(luci.sys.user.checkpasswd, accs, def)
 369                                 if not user or not util.contains(accs, user) then
 370                                         return
 371                                 else
 372                                         if not sess then
 373                                                 local sdat = util.ubus("session", "create", { timeout = luci.config.sauth.sessiontime })
 374                                                 if sdat then
 375                                                         local token = luci.sys.uniqueid(16)
 376                                                         util.ubus("session", "set", {
 377                                                                 ubus_rpc_session = sdat.ubus_rpc_session,
 378                                                                 values = {
 379                                                                         user = user,
 380                                                                         token = token,
 381                                                                         section = luci.sys.uniqueid(16)
 382                                                                 }
 383                                                         })
 384                                                         sess = sdat.ubus_rpc_session
 385                                                         ctx.urltoken.stok = token
 386                                                 end
 387                                         end
 388
 389                                         if sess then
 390                                                 http.header("Set-Cookie", "sysauth=" .. sess.."; path="..build_url())
 391                                                 ctx.authsession = sess
 392                                                 ctx.authuser = user
 393                                         end
 394                                 end
 395                         else
 396                                 http.status(403, "Forbidden")
 397                                 return
 398                         end
 399                 else
 400                         ctx.authsession = sess
 401                         ctx.authuser = user
 402                 end
 403         end
 404
 405         if track.setgroup then
 406                 luci.sys.process.setgroup(track.setgroup)
 407         end
 408
 409         if track.setuser then
 410                 luci.sys.process.setuser(track.setuser)
 411         end
 412
 413         local target = nil
 414         if c then
 415                 if type(c.target) == "function" then
 416                         target = c.target
 417                 elseif type(c.target) == "table" then
 418                         target = c.target.target
 419                 end
 420         end
 421
 422         if c and (c.index or type(target) == "function") then
 423                 ctx.dispatched = c
 424                 ctx.requested = ctx.requested or ctx.dispatched
 425         end
 426
 427         if c and c.index then
 428                 local tpl = require "luci.template"
 429
 430                 if util.copcall(tpl.render, "indexer", {}) then
 431                         return true
 432                 end
 433         end
 434
 435         if type(target) == "function" then
 436                 util.copcall(function()
 437                         local oldenv = getfenv(target)
 438                         local module = require(c.module)
 439                         local env = setmetatable({}, {__index=
 440
 441                         function(tbl, key)
 442                                 return rawget(tbl, key) or module[key] or oldenv[key]
 443                         end})
 444
 445                         setfenv(target, env)
 446                 end)
 447
 448                 local ok, err
 449                 if type(c.target) == "table" then
 450                         ok, err = util.copcall(target, c.target, unpack(args))
 451                 else
 452                         ok, err = util.copcall(target, unpack(args))
 453                 end
 454                 assert(ok,
 455                        "Failed to execute " .. (type(c.target) == "function" and "function" or c.target.type or "unknown") ..
 456                        " dispatcher target for entry '/" .. table.concat(request, "/") .. "'.\n" ..
 457                        "The called action terminated with an exception:\n" .. tostring(err or "(unknown)"))
 458         else
 459                 local root = node()
 460                 if not root or not root.target then
 461                         error404("No root node was registered, this usually happens if no module was installed.\n" ..
 462                                  "Install luci-mod-admin-full and retry. " ..
 463                                  "If the module is already installed, try removing the /tmp/luci-indexcache file.")
 464                 else
 465                         error404("No page is registered at '/" .. table.concat(request, "/") .. "'.\n" ..
 466                                  "If this url belongs to an extension, make sure it is properly installed.\n" ..
 467                                  "If the extension was recently installed, try removing the /tmp/luci-indexcache file.")
 468                 end
 469         end
 470 end
 471
 472 --- Generate the dispatching index using the native file-cache based strategy.
 473 function createindex()
 474         local controllers = { }
 475         local base = "%s/controller/" % util.libpath()
 476         local _, path
 477
 478         for path in (fs.glob("%s*.lua" % base) or function() end) do
 479                 controllers[#controllers+1] = path
 480         end
 481
 482         for path in (fs.glob("%s*/*.lua" % base) or function() end) do
 483                 controllers[#controllers+1] = path
 484         end
 485
 486         if indexcache then
 487                 local cachedate = fs.stat(indexcache, "mtime")
 488                 if cachedate then
 489                         local realdate = 0
 490                         for _, obj in ipairs(controllers) do
 491                                 local omtime = fs.stat(obj, "mtime")
 492                                 realdate = (omtime and omtime > realdate) and omtime or realdate
 493                         end
 494
 495                         if cachedate > realdate and sys.process.info("uid") == 0 then
 496                                 assert(
 497                                         sys.process.info("uid") == fs.stat(indexcache, "uid")
 498                                         and fs.stat(indexcache, "modestr") == "rw-------",
 499                                         "Fatal: Indexcache is not sane!"
 500                                 )
 501
 502                                 index = loadfile(indexcache)()
 503                                 return index
 504                         end
 505                 end
 506         end
 507
 508         index = {}
 509
 510         for _, path in ipairs(controllers) do
 511                 local modname = "luci.controller." .. path:sub(#base+1, #path-4):gsub("/", ".")
 512                 local mod = require(modname)
 513                 assert(mod ~= true,
 514                        "Invalid controller file found\n" ..
 515                        "The file '" .. path .. "' contains an invalid module line.\n" ..
 516                        "Please verify whether the module name is set to '" .. modname ..
 517                        "' - It must correspond to the file path!")
 518
 519                 local idx = mod.index
 520                 assert(type(idx) == "function",
 521                        "Invalid controller file found\n" ..
 522                        "The file '" .. path .. "' contains no index() function.\n" ..
 523                        "Please make sure that the controller contains a valid " ..
 524                        "index function and verify the spelling!")
 525
 526                 index[modname] = idx
 527         end
 528
 529         if indexcache then
 530                 local f = nixio.open(indexcache, "w", 600)
 531                 f:writeall(util.get_bytecode(index))
 532                 f:close()
 533         end
 534 end
 535
 536 --- Create the dispatching tree from the index.
 537 -- Build the index before if it does not exist yet.
 538 function createtree()
 539         if not index then
 540                 createindex()
 541         end
 542
 543         local ctx  = context
 544         local tree = {nodes={}, inreq=true}
 545         local modi = {}
 546
 547         ctx.treecache = setmetatable({}, {__mode="v"})
 548         ctx.tree = tree
 549         ctx.modifiers = modi
 550
 551         -- Load default translation
 552         require "luci.i18n".loadc("base")
 553
 554         local scope = setmetatable({}, {__index = luci.dispatcher})
 555
 556         for k, v in pairs(index) do
 557                 scope._NAME = k
 558                 setfenv(v, scope)
 559                 v()
 560         end
 561
 562         local function modisort(a,b)
 563                 return modi[a].order < modi[b].order
 564         end
 565
 566         for _, v in util.spairs(modi, modisort) do
 567                 scope._NAME = v.module
 568                 setfenv(v.func, scope)
 569                 v.func()
 570         end
 571
 572         return tree
 573 end
 574
 575 --- Register a tree modifier.
 576 -- @param       func    Modifier function
 577 -- @param       order   Modifier order value (optional)
 578 function modifier(func, order)
 579         context.modifiers[#context.modifiers+1] = {
 580                 func = func,
 581                 order = order or 0,
 582                 module
 583                         = getfenv(2)._NAME
 584         }
 585 end
 586
 587 --- Clone a node of the dispatching tree to another position.
 588 -- @param       path    Virtual path destination
 589 -- @param       clone   Virtual path source
 590 -- @param       title   Destination node title (optional)
 591 -- @param       order   Destination node order value (optional)
 592 -- @return                      Dispatching tree node
 593 function assign(path, clone, title, order)
 594         local obj  = node(unpack(path))
 595         obj.nodes  = nil
 596         obj.module = nil
 597
 598         obj.title = title
 599         obj.order = order
 600
 601         setmetatable(obj, {__index = _create_node(clone)})
 602
 603         return obj
 604 end
 605
 606 --- Create a new dispatching node and define common parameters.
 607 -- @param       path    Virtual path
 608 -- @param       target  Target function to call when dispatched.
 609 -- @param       title   Destination node title
 610 -- @param       order   Destination node order value (optional)
 611 -- @return                      Dispatching tree node
 612 function entry(path, target, title, order)
 613         local c = node(unpack(path))
 614
 615         c.target = target
 616         c.title  = title
 617         c.order  = order
 618         c.module = getfenv(2)._NAME
 619
 620         return c
 621 end
 622
 623 --- Fetch or create a dispatching node without setting the target module or
 624 -- enabling the node.
 625 -- @param       ...             Virtual path
 626 -- @return                      Dispatching tree node
 627 function get(...)
 628         return _create_node({...})
 629 end
 630
 631 --- Fetch or create a new dispatching node.
 632 -- @param       ...             Virtual path
 633 -- @return                      Dispatching tree node
 634 function node(...)
 635         local c = _create_node({...})
 636
 637         c.module = getfenv(2)._NAME
 638         c.auto = nil
 639
 640         return c
 641 end
 642
 643 function _create_node(path)
 644         if #path == 0 then
 645                 return context.tree
 646         end
 647
 648         local name = table.concat(path, ".")
 649         local c = context.treecache[name]
 650
 651         if not c then
 652                 local last = table.remove(path)
 653                 local parent = _create_node(path)
 654
 655                 c = {nodes={}, auto=true}
 656                 -- the node is "in request" if the request path matches
 657                 -- at least up to the length of the node path
 658                 if parent.inreq and context.path[#path+1] == last then
 659                   c.inreq = true
 660                 end
 661                 parent.nodes[last] = c
 662                 context.treecache[name] = c
 663         end
 664         return c
 665 end
 666
 667 -- Subdispatchers --
 668
 669 function _firstchild()
 670    local path = { unpack(context.path) }
 671    local name = table.concat(path, ".")
 672    local node = context.treecache[name]
 673
 674    local lowest
 675    if node and node.nodes and next(node.nodes) then
 676           local k, v
 677           for k, v in pairs(node.nodes) do
 678                  if not lowest or
 679                         (v.order or 100) < (node.nodes[lowest].order or 100)
 680                  then
 681                         lowest = k
 682                  end
 683           end
 684    end
 685
 686    assert(lowest ~= nil,
 687                   "The requested node contains no childs, unable to redispatch")
 688
 689    path[#path+1] = lowest
 690    dispatch(path)
 691 end
 692
 693 --- Alias the first (lowest order) page automatically
 694 function firstchild()
 695    return { type = "firstchild", target = _firstchild }
 696 end
 697
 698 --- Create a redirect to another dispatching node.
 699 -- @param       ...             Virtual path destination
 700 function alias(...)
 701         local req = {...}
 702         return function(...)
 703                 for _, r in ipairs({...}) do
 704                         req[#req+1] = r
 705                 end
 706
 707                 dispatch(req)
 708         end
 709 end
 710
 711 --- Rewrite the first x path values of the request.
 712 -- @param       n               Number of path values to replace
 713 -- @param       ...             Virtual path to replace removed path values with
 714 function rewrite(n, ...)
 715         local req = {...}
 716         return function(...)
 717                 local dispatched = util.clone(context.dispatched)
 718
 719                 for i=1,n do
 720                         table.remove(dispatched, 1)
 721                 end
 722
 723                 for i, r in ipairs(req) do
 724                         table.insert(dispatched, i, r)
 725                 end
 726
 727                 for _, r in ipairs({...}) do
 728                         dispatched[#dispatched+1] = r
 729                 end
 730
 731                 dispatch(dispatched)
 732         end
 733 end
 734
 735
 736 local function _call(self, ...)
 737         local func = getfenv()[self.name]
 738         assert(func ~= nil,
 739                'Cannot resolve function "' .. self.name .. '". Is it misspelled or local?')
 740
 741         assert(type(func) == "function",
 742                'The symbol "' .. self.name .. '" does not refer to a function but data ' ..
 743                'of type "' .. type(func) .. '".')
 744
 745         if #self.argv > 0 then
 746                 return func(unpack(self.argv), ...)
 747         else
 748                 return func(...)
 749         end
 750 end
 751
 752 --- Create a function-call dispatching target.
 753 -- @param       name    Target function of local controller
 754 -- @param       ...             Additional parameters passed to the function
 755 function call(name, ...)
 756         return {type = "call", argv = {...}, name = name, target = _call}
 757 end
 758
 759
 760 local _template = function(self, ...)
 761         require "luci.template".render(self.view)
 762 end
 763
 764 --- Create a template render dispatching target.
 765 -- @param       name    Template to be rendered
 766 function template(name)
 767         return {type = "template", view = name, target = _template}
 768 end
 769
 770
 771 local function _cbi(self, ...)
 772         local cbi = require "luci.cbi"
 773         local tpl = require "luci.template"
 774         local http = require "luci.http"
 775
 776         local config = self.config or {}
 777         local maps = cbi.load(self.model, ...)
 778
 779         local state = nil
 780
 781         for i, res in ipairs(maps) do
 782                 res.flow = config
 783                 local cstate = res:parse()
 784                 if cstate and (not state or cstate < state) then
 785                         state = cstate
 786                 end
 787         end
 788
 789         local function _resolve_path(path)
 790                 return type(path) == "table" and build_url(unpack(path)) or path
 791         end
 792
 793         if config.on_valid_to and state and state > 0 and state < 2 then
 794                 http.redirect(_resolve_path(config.on_valid_to))
 795                 return
 796         end
 797
 798         if config.on_changed_to and state and state > 1 then
 799                 http.redirect(_resolve_path(config.on_changed_to))
 800                 return
 801         end
 802
 803         if config.on_success_to and state and state > 0 then
 804                 http.redirect(_resolve_path(config.on_success_to))
 805                 return
 806         end
 807
 808         if config.state_handler then
 809                 if not config.state_handler(state, maps) then
 810                         return
 811                 end
 812         end
 813
 814         http.header("X-CBI-State", state or 0)
 815
 816         if not config.noheader then
 817                 tpl.render("cbi/header", {state = state})
 818         end
 819
 820         local redirect
 821         local messages
 822         local applymap   = false
 823         local pageaction = true
 824         local parsechain = { }
 825
 826         for i, res in ipairs(maps) do
 827                 if res.apply_needed and res.parsechain then
 828                         local c
 829                         for _, c in ipairs(res.parsechain) do
 830                                 parsechain[#parsechain+1] = c
 831                         end
 832                         applymap = true
 833                 end
 834
 835                 if res.redirect then
 836                         redirect = redirect or res.redirect
 837                 end
 838
 839                 if res.pageaction == false then
 840                         pageaction = false
 841                 end
 842
 843                 if res.message then
 844                         messages = messages or { }
 845                         messages[#messages+1] = res.message
 846                 end
 847         end
 848
 849         for i, res in ipairs(maps) do
 850                 res:render({
 851                         firstmap   = (i == 1),
 852                         applymap   = applymap,
 853                         redirect   = redirect,
 854                         messages   = messages,
 855                         pageaction = pageaction,
 856                         parsechain = parsechain
 857                 })
 858         end
 859
 860         if not config.nofooter then
 861                 tpl.render("cbi/footer", {
 862                         flow       = config,
 863                         pageaction = pageaction,
 864                         redirect   = redirect,
 865                         state      = state,
 866                         autoapply  = config.autoapply
 867                 })
 868         end
 869 end
 870
 871 --- Create a CBI model dispatching target.
 872 -- @param       model   CBI model to be rendered
 873 function cbi(model, config)
 874         return {type = "cbi", config = config, model = model, target = _cbi}
 875 end
 876
 877
 878 local function _arcombine(self, ...)
 879         local argv = {...}
 880         local target = #argv > 0 and self.targets[2] or self.targets[1]
 881         setfenv(target.target, self.env)
 882         target:target(unpack(argv))
 883 end
 884
 885 --- Create a combined dispatching target for non argv and argv requests.
 886 -- @param trg1  Overview Target
 887 -- @param trg2  Detail Target
 888 function arcombine(trg1, trg2)
 889         return {type = "arcombine", env = getfenv(), target = _arcombine, targets = {trg1, trg2}}
 890 end
 891
 892
 893 local function _form(self, ...)
 894         local cbi = require "luci.cbi"
 895         local tpl = require "luci.template"
 896         local http = require "luci.http"
 897
 898         local maps = luci.cbi.load(self.model, ...)
 899         local state = nil
 900
 901         for i, res in ipairs(maps) do
 902                 local cstate = res:parse()
 903                 if cstate and (not state or cstate < state) then
 904                         state = cstate
 905                 end
 906         end
 907
 908         http.header("X-CBI-State", state or 0)
 909         tpl.render("header")
 910         for i, res in ipairs(maps) do
 911                 res:render()
 912         end
 913         tpl.render("footer")
 914 end
 915
 916 --- Create a CBI form model dispatching target.
 917 -- @param       model   CBI form model tpo be rendered
 918 function form(model)
 919         return {type = "cbi", model = model, target = _form}
 920 end
 921
 922 --- Access the luci.i18n translate() api.
 923 -- @class  function
 924 -- @name   translate
 925 -- @param  text    Text to translate
 926 translate = i18n.translate
 927
 928 --- No-op function used to mark translation entries for menu labels.
 929 -- This function does not actually translate the given argument but
 930 -- is used by build/i18n-scan.pl to find translatable entries.
 931 function _(text)
 932         return text
 933 end