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
   6 Licensed under the Apache License, Version 2.0 (the "License");
   7 you may not use this file except in compliance with the License.
   8 You may obtain a copy of the License at
   9
  10         http://www.apache.org/licenses/LICENSE-2.0
  11
  12 $Id$
  13
  14 ]]--
  15
  16 module("luci.httpd.server", package.seeall)
  17 require("socket")
  18 require("socket.http")
  19 require("luci.util")
  20
  21 READ_BUFSIZE = 1024
  22
  23
  24 VHost = luci.util.class()
  25
  26 function VHost.__init__(self, handler)
  27         self.handler = handler
  28         self.dhandler = {}
  29 end
  30
  31 function VHost.process(self, request, sourcein, sinkerr, ...)
  32         local handler = self.handler
  33
  34         local uri = request.env.REQUEST_URI:match("^([^?]*)")
  35
  36         -- SCRIPT_NAME
  37         request.env.SCRIPT_NAME = ""
  38
  39         -- Call URI part
  40         request.env.PATH_INFO = uri
  41
  42         for k, dhandler in pairs(self.dhandler) do
  43                 if k == uri or k.."/" == uri:sub(1, #k+1) then
  44                         handler = dhandler
  45                         request.env.SCRIPT_NAME = k
  46                         request.env.PATH_INFO   = uri:sub(#k+1)
  47                         break;
  48                 end
  49         end
  50
  51         if handler then
  52                 return handler:process(request, sourcein, sinkerr, ...)
  53         end
  54 end
  55
  56
  57 function VHost.set_default_handler(self, handler)
  58         self.handler = handler
  59 end
  60
  61
  62 function VHost.set_handler(self, match, handler)
  63         self.dhandler[match] = handler
  64 end
  65
  66
  67
  68 Server = luci.util.class()
  69
  70 function Server.__init__(self, host)
  71         self.host = host
  72         self.vhosts = {}
  73 end
  74
  75 function Server.set_default_vhost(self, vhost)
  76         self.host = vhost
  77 end
  78
  79 -- Sets a vhost
  80 function Server.set_vhost(self, name, vhost)
  81         self.vhosts[name] = vhost
  82 end
  83
  84 function Server.create_daemon_handlers(self)
  85         return function(...) return self:process(...) end,
  86                 function(...) return self:error_overload(...) end
  87 end
  88
  89
  90 function Server.error(self, socket, code, msg)
  91         hcode = tostring(code)
  92
  93         socket:send( "HTTP/1.0 " .. hcode .. " " ..
  94          luci.http.protocol.statusmsg[code] .. "\r\n" )
  95         socket:send( "Connection: close\r\n" )
  96         socket:send( "Content-Type: text/plain\r\n\r\n" )
  97
  98         if msg then
  99                 socket:send( "HTTP-Error " .. code .. ": " .. msg .. "\r\n" )
 100         end
 101 end
 102
 103 function Server.error_overload(self, socket)
 104         self:error(socket, 503, "Too many simultaneous connections")
 105 end
 106
 107
 108 function Server.process( self, thread )
 109
 110         -- Setup sockets and sources
 111         local client = thread.socket
 112         client:settimeout( 0 )
 113         local sourcein  = ltn12.source.empty()
 114         local sourcehdr = luci.http.protocol.header_source( thread )
 115         local sinkerr   = ltn12.sink.file( io.stderr )
 116
 117         local close = false
 118
 119         local reading = { client }
 120
 121         local message, err
 122
 123         repeat
 124                 -- parse headers
 125                 message, err = luci.http.protocol.parse_message_header( sourcehdr )
 126
 127                 if not message then
 128                         self:error( client, 400, err )
 129                         break
 130                 end
 131
 132                 -- keep-alive
 133                 if message.http_version == 1.1 then
 134                         close = (message.env.HTTP_CONNECTION == "close")
 135                 else
 136                         close = not message.env.HTTP_CONNECTION or message.env.HTTP_CONNECTION == "close"
 137                 end
 138
 139                 if message.request_method == "get" or message.request_method == "head" then
 140                         -- Be happy
 141
 142                 elseif message.request_method == "post" then
 143                         -- If we have a HTTP/1.1 client and an Expect: 100-continue header then
 144                         -- respond with HTTP 100 Continue message
 145                         if message.http_version == 1.1 and message.headers['Expect'] and
 146                                 message.headers['Expect'] == '100-continue'
 147                         then
 148                                 client:send("HTTP/1.1 100 Continue\r\n\r\n")
 149                         end
 150
 151                         if message.headers['Transfer-Encoding'] and
 152                          message.headers['Transfer-Encoding'] ~= "identity" then
 153                                 sourcein = socket.source("http-chunked", thread)
 154                         elseif message.env.CONTENT_LENGTH then
 155                                 sourcein = socket.source("by-length", thread,
 156                                  tonumber(message.env.CONTENT_LENGTH))
 157                         else
 158                                 self:error( client, 411, luci.http.protocol.statusmsg[411] )
 159                                 break;
 160                         end
 161
 162                 else
 163                         self:error( client, 405, luci.http.protocol.statusmsg[405] )
 164                         break;
 165
 166                 end
 167
 168
 169                 local host = self.vhosts[message.env.HTTP_HOST] or self.host
 170                 if not host then
 171                         self:error( client, 500, "Unable to find matching host" )
 172                         break;
 173                 end
 174
 175                 local response, sourceout = host:process(
 176                         message, sourcein, sinkerr,
 177                         client, io.stderr
 178                 )
 179                 if not response then
 180                         self:error( client, 500, "Error processing handler" )
 181                 end
 182
 183                 -- Post process response
 184                 local sinkmode = close and "close-when-done" or "keep-open"
 185
 186                 if sourceout then
 187                         if not response.headers["Content-Length"] then
 188                                 if message.http_version == 1.1 then
 189                                         response.headers["Transfer-Encoding"] = "chunked"
 190                                         sinkmode = "http-chunked"
 191                                 else
 192                                         close = true
 193                                         sinkmode = "close-when-done"
 194                                 end
 195                         end
 196                 end
 197
 198                 if close then
 199                         response.headers["Connection"] = "close"
 200                 end
 201
 202
 203                 local sinkout = socket.sink(sinkmode, client)
 204
 205                 local header =
 206                         message.env.SERVER_PROTOCOL .. " " ..
 207                         tostring(response.status) .. " " ..
 208                         luci.http.protocol.statusmsg[response.status] .. "\r\n"
 209
 210
 211                 for k,v in pairs(response.headers) do
 212                         header = header .. k .. ": " .. v .. "\r\n"
 213                 end
 214
 215                 client:send(header .. "\r\n")
 216
 217                 if sourceout then
 218                         local eof = false
 219                         repeat
 220                                 coroutine.yield()
 221                                 eof = not ltn12.pump.step(sourceout, sinkout)
 222                         until eof
 223                 end
 224         until close
 225
 226         client:close()
 227 end