luci/libs/httpd/luasrc/httpd/server.lua
2008-06-23 19:21:54 +00:00

214 lines
4.5 KiB
Lua

--[[
HTTP server implementation for LuCI - helper class
(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
$Id$
]]--
module("luci.httpd.server", package.seeall)
require("luci.util")
READ_BUFSIZE = 1024
VHost = luci.util.class()
function VHost.__init__(self, handler)
self.handler = handler
self.dhandler = {}
end
function VHost.process(self, request, sourcein, sinkout, sinkerr)
local handler = self.handler
local uri = request.env.REQUEST_URI:match("^([^?]*)")
-- SCRIPT_NAME
request.env.SCRIPT_NAME = ""
-- Call URI part
request.env.PATH_INFO = uri
for k, dhandler in pairs(self.dhandler) do
if k == uri or k.."/" == uri:sub(1, #k+1) then
handler = dhandler
request.env.SCRIPT_NAME = k
request.env.PATH_INFO = uri:sub(#k+1)
break;
end
end
if handler then
handler:process(request, sourcein, sinkout, sinkerr)
return true
else
return false
end
end
function VHost.set_default_handler(self, handler)
self.handler = handler
end
function VHost.set_handler(self, match, handler)
self.dhandler[match] = handler
end
Server = luci.util.class()
function Server.__init__(self, host)
self.clhandler = client_handler
self.errhandler = error503
self.host = host
self.vhosts = {}
end
function Server.set_default_vhost(self, vhost)
self.host = vhost
end
-- Sets a vhost
function Server.set_vhost(self, name, vhost)
self.vhosts[name] = vhost
end
function Server.create_daemon_handlers(self)
return function(...) return self:process(...) end,
function(...) return self:error503(...) end
end
function Server.create_client_sources(self, client)
-- Create LTN12 block source
local block_source = function()
-- Yielding here may cause chaos in coroutine based modules, be careful
-- coroutine.yield()
local chunk, err, part = client:receive( READ_BUFSIZE )
if chunk == nil and err == "timeout" then
return part
elseif chunk ~= nil then
return chunk
else
return nil, err
end
end
-- Create LTN12 line source
local line_source = ltn12.source.simplify( function()
coroutine.yield()
local chunk, err, part = client:receive("*l")
-- Line too long
if chunk == nil and err ~= "timeout" then
return nil, part
and "Line exceeds maximum allowed length["..part.."]"
or "Unexpected EOF"
-- Line ok
elseif chunk ~= nil then
-- Strip trailing CR
chunk = chunk:gsub("\r$","")
-- We got end of headers, switch to dummy source
if #chunk == 0 then
return "", function()
return nil
end
else
return chunk, nil
end
end
end )
return block_source, line_source
end
function Server.error400(self, socket, msg)
socket:send( "HTTP/1.0 400 Bad request\r\n" )
socket:send( "Content-Type: text/plain\r\n\r\n" )
if msg then
socket:send( msg .. "\r\n" )
end
socket:close()
end
function Server.error500(self, socket, msg)
socket:send( "HTTP/1.0 500 Internal Server Error\r\n" )
socket:send( "Content-Type: text/plain\r\n\r\n" )
if msg then
socket:send( msg .. "\r\n" )
end
socket:close()
end
function Server.error503(self, socket)
socket:send( "HTTP/1.0 503 Server unavailable\r\n" )
socket:send( "Content-Type: text/plain\r\n\r\n" )
socket:send( "There are too many clients connected, try again later\r\n" )
socket:close()
end
function Server.process(self, client)
client:settimeout( 0 )
local sourcein, sourcehdr = self:create_client_sources(client)
local sinkerr = ltn12.sink.file(io.stderr)
-- FIXME: Add keep-alive support
local sinkout = socket.sink("close-when-done", client)
coroutine.yield()
-- parse headers
local message, err = luci.http.protocol.parse_message_header( sourcehdr )
if message then
-- If we have a HTTP/1.1 client and an Expect: 100-continue header then
-- respond with HTTP 100 Continue message
if message.http_version == 1.1 and message.headers['Expect'] and
message.headers['Expect'] == '100-continue'
then
client:send("HTTP/1.1 100 Continue\r\n\r\n")
end
local host = self.vhosts[message.env.HTTP_HOST] or self.host
if host then
if host:process(message, sourcein, sinkout, sinkerr) then
sinkout()
else
self:error500( client, "No suitable path handler found" )
end
else
self:error500( client, "No suitable host handler found" )
end
else
self:error400( client, err )
return nil
end
end