/
response.lua
270 lines (247 loc) · 8.37 KB
/
response.lua
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local user_meta = require('utils').user_meta
local tcp_meta = require('tcp').meta
local os_date = require('os').date
local table_concat = require('table').concat
local string_format = require('string').format
local Response = {}
local status_codes_table = {
[100] = 'Continue',
[101] = 'Switching Protocols',
[102] = 'Processing', -- RFC 2518, obsoleted by RFC 4918
[200] = 'OK',
[201] = 'Created',
[202] = 'Accepted',
[203] = 'Non-Authoritative Information',
[204] = 'No Content',
[205] = 'Reset Content',
[206] = 'Partial Content',
[207] = 'Multi-Status', -- RFC 4918
[300] = 'Multiple Choices',
[301] = 'Moved Permanently',
[302] = 'Moved Temporarily',
[303] = 'See Other',
[304] = 'Not Modified',
[305] = 'Use Proxy',
[307] = 'Temporary Redirect',
[400] = 'Bad Request',
[401] = 'Unauthorized',
[402] = 'Payment Required',
[403] = 'Forbidden',
[404] = 'Not Found',
[405] = 'Method Not Allowed',
[406] = 'Not Acceptable',
[407] = 'Proxy Authentication Required',
[408] = 'Request Time-out',
[409] = 'Conflict',
[410] = 'Gone',
[411] = 'Length Required',
[412] = 'Precondition Failed',
[413] = 'Request Entity Too Large',
[414] = 'Request-URI Too Large',
[415] = 'Unsupported Media Type',
[416] = 'Requested Range Not Satisfiable',
[417] = 'Expectation Failed',
[418] = 'I\'m a teapot', -- RFC 2324
[422] = 'Unprocessable Entity', -- RFC 4918
[423] = 'Locked', -- RFC 4918
[424] = 'Failed Dependency', -- RFC 4918
[425] = 'Unordered Collection', -- RFC 4918
[426] = 'Upgrade Required', -- RFC 2817
[500] = 'Internal Server Error',
[501] = 'Not Implemented',
[502] = 'Bad Gateway',
[503] = 'Service Unavailable',
[504] = 'Gateway Time-out',
[505] = 'HTTP Version not supported',
[506] = 'Variant Also Negotiates', -- RFC 2295
[507] = 'Insufficient Storage', -- RFC 4918
[509] = 'Bandwidth Limit Exceeded',
[510] = 'Not Extended' -- RFC 2774
}
Response.prototype = {}
setmetatable(Response.prototype, tcp_meta)
function Response.new(client)
local response = {
code = 200,
headers = {},
header_names = {},
headers_sent = false,
userdata = client.userdata,
prototype = Response.prototype
}
setmetatable(response, user_meta)
return response
end
Response.prototype.auto_date = true
Response.prototype.auto_server = "Luvit"
Response.prototype.auto_chunked_encoding = true
Response.prototype.auto_content_length = true
Response.prototype.auto_content_type = "text/html"
function Response.prototype:set_code(code)
if self.headers_sent then error("Headers already sent") end
self.code = code
end
-- This sets a header, replacing any header with the same name (case insensitive)
function Response.prototype:set_header(name, value)
if self.headers_sent then error("Headers already sent") end
local lower = name:lower()
local old_name = self.header_names[lower]
if old_name then
headers[old_name] = nil
end
self.header_names[lower] = name
self.headers[name] = value
return name
end
-- Adds a header line. This does not replace any header by the same name and
-- allows duplicate headers. Returns the index it was inserted at
function Response.prototype:add_header(name, value)
if self.headers_sent then error("Headers already sent") end
self.headers[#self.headers + 1] = name .. ": " .. value
return #self.headers
end
-- Removes a set header. Cannot remove headers added with :add_header
function Response.prototype:unset_header(name)
if self.headers_sent then error("Headers already sent") end
local lower = name:lower()
local name = self.header_names[lower]
if not name then return end
self.headers[name] = nil
self.header_names[lower] = nil
end
function Response.prototype:flush_head(callback)
if self.headers_sent then error("Headers already sent") end
local reason = status_codes_table[self.code]
if not reason then error("Invalid response code " .. tostring(self.code)) end
local head = {"HTTP/1.1 " .. self.code .. " " .. reason .. "\r\n"}
local length = 1
local has_server, has_content_length, has_date, has_content_type
-- We still don't know if there is a body, try to guess
if self.has_body == nil then
-- RFC 2616, 10.2.5:
-- The 204 response MUST NOT include a message-body, and thus is always
-- terminated by the first empty line after the header fields.
-- RFC 2616, 10.3.5:
-- The 304 response MUST NOT contain a message-body, and thus is always
-- terminated by the first empty line after the header fields.
-- RFC 2616, 10.1 Informational 1xx:
-- This class of status code indicates a provisional response,
-- consisting only of the Status-Line and optional headers, and is
-- terminated by an empty line.
if self.code == 204 or self.code == 304 or (self.code >= 100 and self.code < 200) then
self.has_body = false
else
-- Default to true if we don't know. It's the safe thing to assume
self.has_body = true
end
end
local has_body = self.has_body
for field, value in pairs(self.headers) do
if type(field) == "number" then
field, value = value:match("^ *([^ :]+): *([^ ]+) *$")
end
local lower = field:lower()
if lower == "server" then
has_server = true
elseif lower == "content-length" then
has_content_length = true
self.has_body = true
elseif lower == "content-type" then
has_content_type = true
self.has_body = true
elseif lower == "date" then
has_date = true
elseif lower == "transfer-encoding" and value:lower() == "chunked" then
self.chunked = true
self.has_body = true
end
length = length + 1
head[length] = field .. ": " .. value .. "\r\n"
end
-- Implement auto headers so people's http server are more spec compliant
if not has_server and self.auto_server then
length = length + 1
head[length] = "Server: " .. self.auto_server .. "\r\n"
end
if has_body and not has_content_type and self.auto_content_type then
length = length + 1
head[length] = "Content-Type: " .. self.auto_content_type .. "\r\n"
end
if has_body and not has_content_length and self.auto_chunked_encoding then
length = length + 1
self.chunked = true
head[length] = "Transfer-Encoding: chunked\r\n"
end
if not has_date and self.auto_date then
-- This should be RFC 1123 date format
-- IE: Tue, 15 Nov 1994 08:12:31 GMT
length = length + 1
head[length] = os_date("!Date: %a, %d %b %Y %H:%M:%S GMT\r\n")
end
head = table_concat(head, "") .. "\r\n"
self.userdata:write(head, callback)
self.headers_sent = true
end
function Response.prototype:write_head(code, headers, callback)
if self.headers_sent then error("Headers already sent") end
self.code = code
for field, value in pairs(headers) do
if type(field) == "number" then
field = #self.headers + 1
end
self.headers[field] = value
end
self:flush_head(callback)
end
function Response.prototype:write_continue(callback)
self.userdata:write('HTTP/1.1 100 Continue\r\n\r\n', callback)
end
function Response.prototype:write(chunk, callback)
if self.has_body == false then error("Body not allowed") end
if not self.headers_sent then
self.has_body = true
self:flush_head()
end
local userdata = self.userdata
if self.chunked then
userdata:write(string_format("%x\r\n", #chunk))
userdata:write(chunk)
return userdata:write("\r\n", callback)
end
return userdata:write(chunk, callback)
end
function Response.prototype:finish(chunk, callback)
if chunk and self.has_body == false then error ("Body not allowed") end
if not self.headers_sent then
if self.has_body == nil then
if chunk then
if self.auto_content_length and #self.headers == 0
and (not self.header_names["content-length"])
and (not self.header_names["transfer-encoding"]) then
self:set_header("Content-Length", #chunk)
end
self.has_body = true
else
self.has_body = false
end
end
self:flush_head()
end
if type(chunk) == "function" and callback == nil then
callback = chunk
chunk = nil
end
if chunk then
self:write(chunk)
end
if self.chunked then
self.userdata:write('0\r\n\r\n')
end
self:shutdown(function ()
self:close()
if callback then
self:on("closed", callback)
end
end)
end
return Response