modules/base/luasrc/sgi/cgi.lua

   1 --[[
   2 LuCI - SGI-Module for CGI
   3
   4 Description:
   5 Server Gateway Interface for CGI
   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 exectime = os.clock()
  27 module("luci.sgi.cgi", package.seeall)
  28 local ltn12 = require("luci.ltn12")
  29 require("nixio.util")
  30 require("luci.http")
  31 require("luci.sys")
  32 require("luci.dispatcher")
  33
  34 -- Limited source to avoid endless blocking
  35 local function limitsource(handle, limit)
  36         limit = limit or 0
  37         local BLOCKSIZE = ltn12.BLOCKSIZE
  38
  39         return function()
  40                 if limit < 1 then
  41                         handle:close()
  42                         return nil
  43                 else
  44                         local read = (limit > BLOCKSIZE) and BLOCKSIZE or limit
  45                         limit = limit - read
  46
  47                         local chunk = handle:read(read)
  48                         if not chunk then handle:close() end
  49                         return chunk
  50                 end
  51         end
  52 end
  53
  54 function run()
  55         local r = luci.http.Request(
  56                 luci.sys.getenv(),
  57                 limitsource(io.stdin, tonumber(luci.sys.getenv("CONTENT_LENGTH"))),
  58                 ltn12.sink.file(io.stderr)
  59         )
  60
  61         local x = coroutine.create(luci.dispatcher.httpdispatch)
  62         local hcache = ""
  63         local active = true
  64
  65         while coroutine.status(x) ~= "dead" do
  66                 local res, id, data1, data2 = coroutine.resume(x, r)
  67
  68                 if not res then
  69                         print("Status: 500 Internal Server Error")
  70                         print("Content-Type: text/plain\n")
  71                         print(id)
  72                         break;
  73                 end
  74
  75                 if active then
  76                         if id == 1 then
  77                                 io.write("Status: " .. tostring(data1) .. " " .. data2 .. "\r\n")
  78                         elseif id == 2 then
  79                                 hcache = hcache .. data1 .. ": " .. data2 .. "\r\n"
  80                         elseif id == 3 then
  81                                 io.write(hcache)
  82                                 io.write("\r\n")
  83                         elseif id == 4 then
  84                                 io.write(tostring(data1 or ""))
  85                         elseif id == 5 then
  86                                 io.flush()
  87                                 io.close()
  88                                 active = false
  89                         elseif id == 6 then
  90                                 data1:copyz(nixio.stdout, data2)
  91                                 data1:close()
  92                         end
  93                 end
  94         end
  95 end