libs/uvl/luasrc/uvl/validation.lua

   1 --[[
   2
   3 UCI Validation Layer - Validation helper
   4 (c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
   5 (c) 2008 Steven Barth <steven@midlink.org>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14
  15 ]]--
  16
  17 module( "luci.uvl.validation", package.seeall )
  18
  19 require("luci.fs")
  20 require("luci.sys")
  21
  22 local ERR = luci.uvl.errors
  23
  24 function _exec( bin, args )
  25         local cmd, output = "", nil
  26
  27         for _, v in ipairs({ bin, unpack(args) }) do
  28                 cmd = cmd .. string.format("%q ",v):gsub("([%$`])","\\%1")
  29         end
  30
  31         local tmpfile = "/tmp/uvl" .. luci.sys.uniqueid(8)
  32         local retval  = os.execute( cmd .. " 1>" .. tmpfile .. " 2>" .. tmpfile )
  33
  34         if luci.fs.access(tmpfile) then
  35                 output = luci.fs.readfile(tmpfile)
  36                 luci.fs.unlink(tmpfile)
  37         end
  38
  39         return retval, output
  40 end
  41
  42 function check( self, object )
  43         if object:scheme('validators') then
  44                 for _, val in ipairs(object:scheme('validators')) do
  45                         local ok, err = false, nil
  46
  47                         local values = object:value()
  48                               values = type(values) == "table" and values or { values }
  49
  50                         local args = {
  51                                 object:scheme('type'), object:scheme('datatype'),
  52                                 object.cref[1], object.cref[2], object.cref[3] or '',
  53                                 unpack(values)
  54                         }
  55
  56                         if type(val) == "function" then
  57                                 ok, err = val(unpack(args))
  58                         else
  59                                 ok, err = _exec( val, args )
  60                                 ok = ( ok == 0 )
  61                         end
  62
  63                         if not ok then
  64                                 return false, ERR.SME_ERRVAL(object, {tostring(val), err})
  65                         end
  66                 end
  67         end
  68
  69         return true, nil
  70 end