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         if indexcache then
 304                 local cachedate = fs.mtime(indexcache)
 305                 if cachedate and cachedate > fs.mtime(path) then
 306
 307                         assert(
 308                                 sys.process.info("uid") == fs.stat(indexcache, "uid")
 309                                 and fs.stat(indexcache, "mode") == "rw-------",
 310                                 "Fatal: Indexcache is not sane!"
 311                         )
 312
 313                         index = loadfile(indexcache)()
 314                         return index
 315                 end
 316         end
 317
 318         index = {}
 319
 320         local controllers = util.combine(
 321                 luci.fs.glob(path .. "*" .. suffix) or {},
 322                 luci.fs.glob(path .. "*/*" .. suffix) or {}
 323         )
 324
 325         for i,c in ipairs(controllers) do
 326                 local module = "luci.controller." .. c:sub(#path+1, #c-#suffix):gsub("/", ".")
 327                 local mod = require(module)
 328                 local idx = mod.index
 329
 330                 if type(idx) == "function" then
 331                         index[module] = idx
 332                 end
 333         end
 334
 335         if indexcache then
 336                 fs.writefile(indexcache, util.get_bytecode(index))
 337                 fs.chmod(indexcache, "a-rwx,u+rw")
 338         end
 339 end
 340
 341 --- Create the dispatching tree from the index.
 342 -- Build the index before if it does not exist yet.
 343 function createtree()
 344         if not index then
 345                 createindex()
 346         end
 347
 348         local ctx  = context
 349         local tree = {nodes={}}
 350
 351         ctx.treecache = setmetatable({}, {__mode="v"})
 352         ctx.tree = tree
 353
 354         -- Load default translation
 355         require "luci.i18n".loadc("default")
 356
 357         local scope = setmetatable({}, {__index = luci.dispatcher})
 358
 359         for k, v in pairs(index) do
 360                 scope._NAME = k
 361                 setfenv(v, scope)
 362                 v()
 363         end
 364
 365         return tree
 366 end
 367
 368 --- Clone a node of the dispatching tree to another position.
 369 -- @param       path    Virtual path destination
 370 -- @param       clone   Virtual path source
 371 -- @param       title   Destination node title (optional)
 372 -- @param       order   Destination node order value (optional)
 373 -- @return                      Dispatching tree node
 374 function assign(path, clone, title, order)
 375         local obj  = node(unpack(path))
 376         obj.nodes  = nil
 377         obj.module = nil
 378
 379         obj.title = title
 380         obj.order = order
 381
 382         setmetatable(obj, {__index = _create_node(clone)})
 383
 384         return obj
 385 end
 386
 387 --- Create a new dispatching node and define common parameters.
 388 -- @param       path    Virtual path
 389 -- @param       target  Target function to call when dispatched.
 390 -- @param       title   Destination node title
 391 -- @param       order   Destination node order value (optional)
 392 -- @return                      Dispatching tree node
 393 function entry(path, target, title, order)
 394         local c = node(unpack(path))
 395
 396         c.target = target
 397         c.title  = title
 398         c.order  = order
 399         c.module = getfenv(2)._NAME
 400
 401         return c
 402 end
 403
 404 --- Fetch or create a new dispatching node.
 405 -- @param       ...             Virtual path
 406 -- @return                      Dispatching tree node
 407 function node(...)
 408         local c = _create_node({...})
 409
 410         c.module = getfenv(2)._NAME
 411         c.path = arg
 412         c.auto = nil
 413
 414         return c
 415 end
 416
 417 function _create_node(path, cache)
 418         if #path == 0 then
 419                 return context.tree
 420         end
 421
 422         cache = cache or context.treecache
 423         local name = table.concat(path, ".")
 424         local c = cache[name]
 425
 426         if not c then
 427                 local last = table.remove(path)
 428                 c = _create_node(path, cache)
 429
 430                 local new = {nodes={}, auto=true}
 431                 c.nodes[last] = new
 432                 cache[name] = new
 433
 434                 return new
 435         else
 436                 return c
 437         end
 438 end
 439
 440 -- Subdispatchers --
 441
 442 --- Create a redirect to another dispatching node.
 443 -- @param       ...             Virtual path destination
 444 function alias(...)
 445         local req = {...}
 446         return function(...)
 447                 for _, r in ipairs({...}) do
 448                         req[#req+1] = r
 449                 end
 450
 451                 dispatch(req)
 452         end
 453 end
 454
 455 --- Rewrite the first x path values of the request.
 456 -- @param       n               Number of path values to replace
 457 -- @param       ...             Virtual path to replace removed path values with
 458 function rewrite(n, ...)
 459         local req = {...}
 460         return function(...)
 461                 local dispatched = util.clone(context.dispatched)
 462
 463                 for i=1,n do
 464                         table.remove(dispatched, 1)
 465                 end
 466
 467                 for i, r in ipairs(req) do
 468                         table.insert(dispatched, i, r)
 469                 end
 470
 471                 for _, r in ipairs({...}) do
 472                         dispatched[#dispatched+1] = r
 473                 end
 474
 475                 dispatch(dispatched)
 476         end
 477 end
 478
 479 --- Create a function-call dispatching target.
 480 -- @param       name    Target function of local controller
 481 -- @param       ...             Additional parameters passed to the function
 482 function call(name, ...)
 483         local argv = {...}
 484         return function(...)
 485                 if #argv > 0 then
 486                         return getfenv()[name](unpack(argv), ...)
 487                 else
 488                         return getfenv()[name](...)
 489                 end
 490         end
 491 end
 492
 493 --- Create a template render dispatching target.
 494 -- @param       name    Template to be rendered
 495 function template(name)
 496         return function()
 497                 require("luci.template")
 498                 luci.template.render(name)
 499         end
 500 end
 501
 502 --- Create a CBI model dispatching target.
 503 -- @param       model   CBI model to be rendered
 504 function cbi(model, config)
 505         config = config or {}
 506         return function(...)
 507                 require("luci.cbi")
 508                 require("luci.template")
 509                 local http = require "luci.http"
 510
 511                 maps = luci.cbi.load(model, ...)
 512
 513                 local state = nil
 514
 515                 for i, res in ipairs(maps) do
 516                         if config.autoapply then
 517                                 res.autoapply = config.autoapply
 518                         end
 519                         local cstate = res:parse()
 520                         if not state or cstate < state then
 521                                 state = cstate
 522                         end
 523                 end
 524
 525                 if config.state_handler then
 526                         if not config.state_handler(state, maps) then
 527                                 return
 528                         end
 529                 end
 530
 531                 local pageaction = true
 532                 http.header("X-CBI-State", state or 0)
 533                 luci.template.render("cbi/header", {state = state})
 534                 for i, res in ipairs(maps) do
 535                         res:render()
 536                         if res.pageaction == false then
 537                                 pageaction = false
 538                         end
 539                 end
 540                 luci.template.render("cbi/footer", {pageaction=pageaction, state = state, autoapply = config.autoapply})
 541         end
 542 end
 543
 544 --- Create a CBI form model dispatching target.
 545 -- @param       model   CBI form model tpo be rendered
 546 function form(model)
 547         return function(...)
 548                 require("luci.cbi")
 549                 require("luci.template")
 550                 local http = require "luci.http"
 551
 552                 maps = luci.cbi.load(model, ...)
 553
 554                 local state = nil
 555
 556                 for i, res in ipairs(maps) do
 557                         local cstate = res:parse()
 558                         if not state or cstate < state then
 559                                 state = cstate
 560                         end
 561                 end
 562
 563                 http.header("X-CBI-State", state or 0)
 564                 luci.template.render("header")
 565                 for i, res in ipairs(maps) do
 566                         res:render()
 567                 end
 568                 luci.template.render("footer")
 569         end
 570 end