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|
--
-- This file is part of LEM, a Lua Event Machine.
-- Copyright 2011-2013 Emil Renner Berthing
--
-- LEM is free software: you can redistribute it and/or modify it
-- under the terms of the GNU Lesser General Public License as
-- published by the Free Software Foundation, either version 3 of
-- the License, or (at your option) any later version.
--
-- LEM is distributed in the hope that it will be useful, but
-- WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public
-- License along with LEM. If not, see <http://www.gnu.org/licenses/>.
--
local setmetatable = setmetatable
local tostring = tostring
local tonumber = tonumber
local pairs = pairs
local type = type
local date = os.date
local format = string.format
local concat = table.concat
local remove = table.remove
local io = require 'lem.io'
require 'lem.http'
local M = {}
local status_string = {
[100] = '100 Continue',
[101] = '101 Switching Protocols',
[102] = '102 Processing', -- WebDAV
[200] = '200 OK',
[201] = '201 Created',
[202] = '202 Accepted',
[203] = '203 Non-Authoritative Information',
[204] = '204 No Content',
[205] = '205 Reset Content',
[206] = '206 Partial Content',
[207] = '207 Multi-Status', -- WebDAV
[300] = '300 Multiple Choices',
[301] = '301 Moved Permanently',
[302] = '302 Found',
[303] = '303 See Other',
[304] = '304 Not Modified',
[305] = '305 Use Proxy',
[306] = '306 Switch Proxy',
[307] = '307 Temporary Redirect',
[400] = '400 Bad Request',
[401] = '401 Unauthorized',
[402] = '402 Payment Required',
[403] = '403 Forbidden',
[404] = '404 Not Found',
[405] = '405 Method Not Allowed',
-- ...
[417] = '417 Expectation Failed',
[500] = '500 Internal Server Error',
[501] = '501 Not Implemented',
-- ...
[505] = '505 HTTP Version Not Supported',
-- ...
}
M.status_string = status_string
function M.not_found(req, res)
if req.headers['Expect'] ~= '100-continue' then
req:body()
end
res.status = 404
res.headers['Content-Type'] = 'text/html; charset=UTF-8'
res:add([[
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>Not Found</title>
</head>
<body>
<h1>Not found</h1>
</body>
</html>
]])
end
function M.htmlerror(num, text)
local str = format([[
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>%s</title>
</head>
<body>
<h1>%s</h1>
</body>
</html>
]], text, text)
return function(req, res)
res.status = num
res.headers['Content-Type'] = 'text/html; charset=UTF-8'
res.headers['Connection'] = 'close'
res:add(str)
end
end
M.method_not_allowed = M.htmlerror(405, 'Method Not Allowed')
M.expectation_failed = M.htmlerror(417, 'Expectation Failed')
M.version_not_supported = M.htmlerror(505, 'HTTP Version Not Supported')
M.bad_request = M.htmlerror(400, 'Bad Request')
function M.debug() end
do
local gsub, char, tonumber = string.gsub, string.char, tonumber
local function tochar(str)
return char(tonumber(str, 16))
end
function M.urldecode(str)
return gsub(gsub(str, '+', ' '), '%%(%x%x)', tochar)
end
end
do
local Response = {}
Response.__index = Response
M.Response = Response
function new_response(req)
local n = 0
return setmetatable({
headers = {},
version = req.version,
add = function(self, ...)
n = n + 1
self[n] = format(...)
end
}, Response)
end
local function check_match(entry, req, res, ok, ...)
if not ok then return false end
local handler = entry[req.method]
if handler then
handler(req, res, ok, ...)
else
M.method_not_allowed(req, res)
end
return true
end
local urldecode = M.urldecode
local function handleHTTP(self, client)
repeat
local req, err = client:read('HTTPRequest')
if not req then self.debug('read', err) break end
local method, uri, version = req.method, req.uri, req.version
req.path = urldecode(uri:match('^([^?]*)'))
local res = new_response(req)
if version ~= '1.0' and version ~= '1.1' then
M.version_not_supported(req, res)
version = '1.1'
else
local expect = req.headers['Expect']
if expect and expect ~= '100-continue' then
M.expectation_failed(req, res)
else
self.handler(req, res)
end
end
local headers = res.headers
local file, close = res.file, false
if type(file) == 'string' then
file, err = io.open(file)
if file then
close = true
else
self.debug('open', err)
res = new_response(req)
headers = res.headers
M.not_found(req, res)
end
end
if not res.status then
if #res == 0 and file == nil then
res.status = 204
else
res.status = 200
end
end
if headers['Content-Length'] == nil and res.status ~= 204 then
local len
if file then
len = file:size()
else
len = 0
for i = 1, #res do
len = len + #res[i]
end
end
headers['Content-Length'] = len
end
if headers['Date'] == nil then
headers['Date'] = date('!%a, %d %b %Y %T GMT')
end
if headers['Server'] == nil then
headers['Server'] = 'Hathaway/0.1 LEM/0.3'
end
if req.headers['Connection'] == 'close' and headers['Connection'] == nil then
headers['Connection'] = 'close'
end
local robe, i = {}, 1
do
local status = res.status
if type(status) == 'number' then
status = status_string[status]
end
robe[1] = format('HTTP/%s %s\r\n', version, status)
end
for k, v in pairs(headers) do
i = i + 1
robe[i] = format('%s: %s\r\n', k, tostring(v))
end
i = i + 1
robe[i] = '\r\n'
client:cork()
local ok, err = client:write(concat(robe))
if not ok then self.debug('write', err) break end
if method ~= 'HEAD' then
if file then
ok, err = client:sendfile(file, headers['Content-Length'])
if close then file:close() end
else
local body = concat(res)
if #body > 0 then
ok, err = client:write(body)
end
end
if not ok then self.debug('write', err) break end
end
client:uncork()
until version == '1.0'
or headers['Connection'] == 'close'
client:close()
end
local Server = {}
Server.__index = Server
M.Server = Server
function Server:run(handler)
return self.socket:autospawn(function(...) return handleHTTP(self, ...) end)
end
local type, setmetatable = type, setmetatable
function M.new(host, port, handler)
local socket, err
if type(host) == 'string' then
socket, err = io.tcp.listen(host, port)
if not socket then
return nil, err
end
else
socket = host
handler = port
end
return setmetatable({
socket = socket,
handler = handler,
debug = M.debug
}, Server)
end
end
return M
-- vim: ts=2 sw=2 noet:
|
