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         }
 116
 117         client:settimeout( 0 )
 118
 119         local sourcein  = ltn12.source.empty()
 120         local sourcehdr = luci.http.protocol.header_source( thread )
 121         local sinkerr   = ltn12.sink.file( io.stderr )
 122
 123         local close = false
 124
 125         local reading = { client }
 126
 127         local message, err
 128
 129         repeat
 130                 -- parse headers
 131                 message, err = luci.http.protocol.parse_message_header( sourcehdr )
 132
 133                 if not message then
 134                         self:error( client, 400, err )
 135                         break
 136                 end
 137
 138                 -- keep-alive
 139                 if message.http_version == 1.1 then
 140                         close = (message.env.HTTP_CONNECTION == "close")
 141                 else
 142                         close = not message.env.HTTP_CONNECTION or message.env.HTTP_CONNECTION == "close"
 143                 end
 144
 145                 if message.request_method == "get" or message.request_method == "head" then
 146                         -- Be happy
 147
 148                 elseif message.request_method == "post" then
 149                         -- If we have a HTTP/1.1 client and an Expect: 100-continue header then
 150                         -- respond with HTTP 100 Continue message
 151                         if message.http_version == 1.1 and message.headers['Expect'] and
 152                                 message.headers['Expect'] == '100-continue'
 153                         then
 154                                 client:send("HTTP/1.1 100 Continue\r\n\r\n")
 155                         end
 156
 157                         if message.headers['Transfer-Encoding'] and
 158                          message.headers['Transfer-Encoding'] ~= "identity" then
 159                                 sourcein = socket.source("http-chunked", thread)
 160                         elseif message.env.CONTENT_LENGTH then
 161                                 sourcein = socket.source("by-length", thread,
 162                                  tonumber(message.env.CONTENT_LENGTH))
 163                         else
 164                                 self:error( client, 411, luci.http.protocol.statusmsg[411] )
 165                                 break;
 166                         end
 167
 168                 else
 169                         self:error( client, 405, luci.http.protocol.statusmsg[405] )
 170                         break;
 171
 172                 end
 173
 174
 175                 local host = self.vhosts[message.env.HTTP_HOST] or self.host
 176                 if not host then
 177                         self:error( client, 500, "Unable to find matching host" )
 178                         break;
 179                 end
 180
 181                 local response, sourceout = host:process(
 182                         message, sourcein, sinkerr,
 183                         client, io.stderr
 184                 )
 185                 if not response then
 186                         self:error( client, 500, "Error processing handler" )
 187                 end
 188
 189                 -- Post process response
 190                 local sinkmode = close and "close-when-done" or "keep-open"
 191
 192                 if sourceout then
 193                         if not response.headers["Content-Length"] then
 194                                 if message.http_version == 1.1 then
 195                                         response.headers["Transfer-Encoding"] = "chunked"
 196                                         sinkmode = "http-chunked"
 197                                 else
 198                                         close = true
 199                                         sinkmode = "close-when-done"
 200                                 end
 201                         end
 202                 end
 203
 204                 if close then
 205                         response.headers["Connection"] = "close"
 206                 end
 207
 208
 209                 local sinkout = socket.sink(sinkmode, client)
 210
 211                 local header =
 212                         message.env.SERVER_PROTOCOL .. " " ..
 213                         tostring(response.status) .. " " ..
 214                         luci.http.protocol.statusmsg[response.status] .. "\r\n"
 215
 216                 header = header .. "Server: LuCI HTTPd/" .. tostring(VERSION) .. "\r\n"
 217
 218
 219                 for k,v in pairs(response.headers) do
 220                         header = header .. k .. ": " .. v .. "\r\n"
 221                 end
 222
 223                 client:send(header .. "\r\n")
 224
 225                 if sourceout then
 226                         local eof = false
 227                         repeat
 228                                 coroutine.yield()
 229                                 eof = not ltn12.pump.step(sourceout, sinkout)
 230                         until eof
 231                 end
 232         until close
 233
 234         client:close()
 235 end