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/1.1 " .. 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         socket.sleep(5)
 124
 125         repeat
 126                 -- parse headers
 127                 message, err = luci.http.protocol.parse_message_header( sourcehdr )
 128
 129                 if not message then
 130                         self:error( client, 400, err )
 131                         break
 132                 end
 133
 134                 coroutine.yield()
 135
 136                 -- keep-alive
 137                 if message.http_version == 1.1 then
 138                         close = (message.env.HTTP_CONNECTION == "close")
 139                 else
 140                         close = not message.env.HTTP_CONNECTION or message.env.HTTP_CONNECTION == "close"
 141                 end
 142
 143                 if message.request_method == "get" or message.request_method == "head" then
 144                         -- Be happy
 145
 146                 elseif message.request_method == "post" then
 147                         -- If we have a HTTP/1.1 client and an Expect: 100-continue header then
 148                         -- respond with HTTP 100 Continue message
 149                         if message.http_version == 1.1 and message.headers['Expect'] and
 150                                 message.headers['Expect'] == '100-continue'
 151                         then
 152                                 client:send("HTTP/1.1 100 Continue\r\n\r\n")
 153                         end
 154
 155                         if message.headers['Transfer-Encoding'] and
 156                          message.headers['Transfer-Encoding'] ~= "identity" then
 157                                 sourcein = socket.source("http-chunked", thread)
 158                         elseif message.env.CONTENT_LENGTH then
 159                                 sourcein = socket.source("by-length", thread,
 160                                  tonumber(message.env.CONTENT_LENGTH))
 161                         else
 162                                 self:error( client, 411, luci.http.protocol.statusmsg[411] )
 163                                 break;
 164                         end
 165
 166                 else
 167                         self:error( client, 405, luci.http.protocol.statusmsg[405] )
 168                         break;
 169
 170                 end
 171
 172
 173                 local host = self.vhosts[message.env.HTTP_HOST] or self.host
 174                 if not host then
 175                         self:error( client, 500, "Unable to find matching host" )
 176                         break;
 177                 end
 178
 179                 coroutine.yield()
 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                 coroutine.yield()
 190
 191                 -- Post process response
 192                 local sinkmode = close and "close-when-done" or "keep-open"
 193
 194                 if sourceout then
 195                         if not response.headers["Content-Length"] then
 196                                 if message.http_version == 1.1 then
 197                                         response.headers["Transfer-Encoding"] = "chunked"
 198                                         sinkmode = "http-chunked"
 199                                 else
 200                                         close = true
 201                                         sinkmode = "close-when-done"
 202                                 end
 203                         end
 204                 end
 205
 206                 if close then
 207                         response.headers["Connection"] = "close"
 208                 end
 209
 210
 211                 local sinkout = socket.sink(sinkmode, client)
 212
 213                 local header =
 214                         message.env.SERVER_PROTOCOL .. " " ..
 215                         tostring(response.status) .. " " ..
 216                         luci.http.protocol.statusmsg[response.status] .. "\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