libs/httpd/luasrc/httpd/server.lua

   1 --[[
   2
   3 HTTP server implementation for LuCI - helper class
   4 (c) 2008 Freifunk Leipzig / 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.httpd.server", package.seeall)
  18 require("socket")
  19 require("socket.http")
  20 require("luci.util")
  21
  22 READ_BUFSIZE = 1024
  23 VERSION = 0.2
  24
  25
  26 VHost = luci.util.class()
  27
  28 function VHost.__init__(self, handler)
  29         self.handler = handler
  30         self.dhandler = {}
  31 end
  32
  33 function VHost.process(self, request, sourcein, sinkerr, ...)
  34         local handler = self.handler
  35
  36         local uri = request.env.REQUEST_URI:match("^([^?]*)")
  37
  38         -- SCRIPT_NAME
  39         request.env.SCRIPT_NAME = ""
  40
  41         -- Call URI part
  42         request.env.PATH_INFO = uri
  43
  44         for k, dhandler in pairs(self.dhandler) do
  45                 if k == uri or k.."/" == uri:sub(1, #k+1) then
  46                         handler = dhandler
  47                         request.env.SCRIPT_NAME = k
  48                         request.env.PATH_INFO   = uri:sub(#k+1)
  49                         break;
  50                 end
  51         end
  52
  53         if handler then
  54                 return handler:process(request, sourcein, sinkerr, ...)
  55         end
  56 end
  57
  58
  59 function VHost.set_default_handler(self, handler)
  60         self.handler = handler
  61 end
  62
  63
  64 function VHost.set_handler(self, match, handler)
  65         self.dhandler[match] = handler
  66 end
  67
  68
  69
  70 Server = luci.util.class()
  71
  72 function Server.__init__(self, host)
  73         self.host = host
  74         self.vhosts = {}
  75 end
  76
  77 function Server.set_default_vhost(self, vhost)
  78         self.host = vhost
  79 end
  80
  81 -- Sets a vhost
  82 function Server.set_vhost(self, name, vhost)
  83         self.vhosts[name] = vhost
  84 end
  85
  86 function Server.create_daemon_handlers(self)
  87         return function(...) return self:process(...) end,
  88                 function(...) return self:error_overload(...) end
  89 end
  90
  91
  92 function Server.error(self, socket, code, msg)
  93         hcode = tostring(code)
  94
  95         socket:send( "HTTP/1.0 " .. hcode .. " " ..
  96          luci.http.protocol.statusmsg[code] .. "\r\n" )
  97         socket:send( "Connection: close\r\n" )
  98         socket:send( "Content-Type: text/plain\r\n\r\n" )
  99
 100         if msg then
 101                 socket:send( "HTTP-Error " .. code .. ": " .. msg .. "\r\n" )
 102         end
 103 end
 104
 105 function Server.error_overload(self, socket)
 106         self:error(socket, 503, "Too many simultaneous connections")
 107 end
 108
 109
 110 function Server.process( self, client )
 111
 112         -- Setup sockets and sources
 113         local thread = {
 114                 receive = function(self, ...) return luci.httpd.corecv(client, ...) end,
 115                 send = function(self, ...) return luci.httpd.cosend(client, ...) end
 116         }
 117
 118         client:settimeout( 0 )
 119
 120         local sourcein  = ltn12.source.empty()
 121         local sourcehdr = luci.http.protocol.header_source( thread )
 122         local sinkerr   = ltn12.sink.file( io.stderr )
 123
 124         local close = false
 125
 126         local reading = { client }
 127
 128         local message, err
 129
 130         repeat
 131                 -- parse headers
 132                 message, err = luci.http.protocol.parse_message_header( sourcehdr )
 133
 134                 if not message then
 135                         self:error( client, 400, err )
 136                         break
 137                 end
 138
 139                 -- keep-alive
 140                 if message.http_version == 1.1 then
 141                         close = (message.env.HTTP_CONNECTION == "close")
 142                 else
 143                         close = not message.env.HTTP_CONNECTION or message.env.HTTP_CONNECTION == "close"
 144                 end
 145
 146                 if message.request_method == "get" or message.request_method == "head" then
 147                         -- Be happy
 148
 149                 elseif message.request_method == "post" then
 150                         -- If we have a HTTP/1.1 client and an Expect: 100-continue header then
 151                         -- respond with HTTP 100 Continue message
 152                         if message.http_version == 1.1 and message.headers['Expect'] and
 153                                 message.headers['Expect'] == '100-continue'
 154                         then
 155                                 client:send("HTTP/1.1 100 Continue\r\n\r\n")
 156                         end
 157
 158                         if message.headers['Transfer-Encoding'] and
 159                          message.headers['Transfer-Encoding'] ~= "identity" then
 160                                 sourcein = socket.source("http-chunked", thread)
 161                         elseif message.env.CONTENT_LENGTH then
 162                                 sourcein = socket.source("by-length", thread,
 163                                  tonumber(message.env.CONTENT_LENGTH))
 164                         else
 165                                 self:error( client, 411, luci.http.protocol.statusmsg[411] )
 166                                 break;
 167                         end
 168
 169                 else
 170                         self:error( client, 405, luci.http.protocol.statusmsg[405] )
 171                         break;
 172
 173                 end
 174
 175
 176                 local host = self.vhosts[message.env.HTTP_HOST] or self.host
 177                 if not host then
 178                         self:error( client, 500, "Unable to find matching host" )
 179                         break;
 180                 end
 181
 182                 local response, sourceout = host:process(
 183                         message, sourcein, sinkerr,
 184                         client, io.stderr
 185                 )
 186                 if not response then
 187                         self:error( client, 500, "Error processing handler" )
 188                 end
 189
 190                 -- Post process response
 191                 local sinkmode = close and "close-when-done" or "keep-open"
 192
 193                 if sourceout then
 194                         if not response.headers["Content-Length"] then
 195                                 if message.http_version == 1.1 then
 196                                         response.headers["Transfer-Encoding"] = "chunked"
 197                                         sinkmode = "http-chunked"
 198                                 else
 199                                         close = true
 200                                         sinkmode = "close-when-done"
 201                                 end
 202                         end
 203                 end
 204
 205                 if close then
 206                         response.headers["Connection"] = "close"
 207                 end
 208
 209
 210                 local sinkout = socket.sink(sinkmode, thread)
 211
 212                 local header =
 213                         message.env.SERVER_PROTOCOL .. " " ..
 214                         tostring(response.status) .. " " ..
 215                         luci.http.protocol.statusmsg[response.status] .. "\r\n"
 216
 217                 header = header .. "Server: LuCI HTTPd/" .. tostring(VERSION) .. "\r\n"
 218
 219
 220                 for k,v in pairs(response.headers) do
 221                         header = header .. k .. ": " .. v .. "\r\n"
 222                 end
 223
 224                 client:send(header .. "\r\n")
 225
 226                 if sourceout then
 227                         local eof = false
 228                         repeat
 229                                 coroutine.yield()
 230                                 eof = not ltn12.pump.step(sourceout, sinkout)
 231                         until eof
 232                 end
 233         until close
 234
 235         client:close()
 236 end