mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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----------------------------------------------------------------------------- -- HTTP/1.1 client support for the Lua language. -- LuaSocket toolkit. -- Author: Diego Nehab ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- -- Declare module and import dependencies ------------------------------------------------------------------------------- socket.http = {} local _M = socket.http ----------------------------------------------------------------------------- -- Program constants ----------------------------------------------------------------------------- -- connection timeout in seconds _M.TIMEOUT = 60 -- user agent field sent in request _M.USERAGENT = socket._VERSION -- supported schemes and their particulars local SCHEMES = { http = { port = 80 , create = function(t) return socket.tcp end } , https = { port = 443 , create = function(t) return https.tcp(t) end }} -- default scheme and port for document retrieval local SCHEME = 'http' local PORT = SCHEMES[SCHEME].port ----------------------------------------------------------------------------- -- Reads MIME headers from a connection, unfolding where needed ----------------------------------------------------------------------------- local function receiveheaders(sock, headers) local line, name, value, err headers = headers or {} -- get first line line, err = sock:receive() if err then return nil, err end -- headers go until a blank line is found while line ~= "" do -- get field-name and value name, value = socket.skip(2, string.find(line, "^(.-):%s*(.*)")) if not (name and value) then return nil, "malformed reponse headers" end name = string.lower(name) -- get next line (value might be folded) line, err = sock:receive() if err then return nil, err end -- unfold any folded values while string.find(line, "^%s") do value = value .. line line = sock:receive() if err then return nil, err end end -- save pair in table if headers[name] then headers[name] = headers[name] .. ", " .. value else headers[name] = value end end return headers end ----------------------------------------------------------------------------- -- Extra sources and sinks ----------------------------------------------------------------------------- socket.sourcet["http-chunked"] = function(sock, headers) return setmetatable({ getfd = function() return sock:getfd() end, dirty = function() return sock:dirty() end }, { __call = function() -- get chunk size, skip extention local line, err = sock:receive() if err then return nil, err end local size = tonumber(string.gsub(line, ";.*", ""), 16) if not size then return nil, "invalid chunk size" end -- was it the last chunk? if size > 0 then -- if not, get chunk and skip terminating CRLF local chunk, err, part = sock:receive(size) if chunk then sock:receive() end return chunk, err else -- if it was, read trailers into headers table headers, err = receiveheaders(sock, headers) if not headers then return nil, err end end end }) end socket.sinkt["http-chunked"] = function(sock) return setmetatable({ getfd = function() return sock:getfd() end, dirty = function() return sock:dirty() end }, { __call = function(self, chunk, err) if not chunk then return sock:send("0\r\n\r\n") end local size = string.format("%X\r\n", string.len(chunk)) return sock:send(size .. chunk .. "\r\n") end }) end ----------------------------------------------------------------------------- -- Low level HTTP API ----------------------------------------------------------------------------- local metat = { __index = {} } function _M.open(host, port, create) -- create socket with user connect function, or with default local c = socket.try(create()) local h = setmetatable({ c = c }, metat) -- create finalized try h.try = socket.newtry(function() h:close() end) -- set timeout before connecting h.try(c:settimeout(_M.TIMEOUT)) h.try(c:connect(host, port)) -- here everything worked return h end function metat.__index:sendrequestline(method, uri) local reqline = string.format("%s %s HTTP/1.1\r\n", method or "GET", uri) return self.try(self.c:send(reqline)) end function metat.__index:sendheaders(tosend) local canonic = headers.canonic local h = "\r\n" for f, v in pairs(tosend) do h = (canonic[f] or f) .. ": " .. v .. "\r\n" .. h end self.try(self.c:send(h)) return 1 end function metat.__index:sendbody(headers, source, step) source = source or ltn12.source.empty() step = step or ltn12.pump.step -- if we don't know the size in advance, send chunked and hope for the best local mode = "http-chunked" if headers["content-length"] then mode = "keep-open" end return self.try(ltn12.pump.all(source, socket.sink(mode, self.c), step)) end function metat.__index:receivestatusline() local status,ec = self.try(self.c:receive(5)) -- identify HTTP/0.9 responses, which do not contain a status line -- this is just a heuristic, but is what the RFC recommends if status ~= "HTTP/" then if ec == "timeout" then return 408 end return nil, status end -- otherwise proceed reading a status line status = self.try(self.c:receive("*l", status)) local code = socket.skip(2, string.find(status, "HTTP/%d*%.%d* (%d%d%d)")) return self.try(tonumber(code), status) end function metat.__index:receiveheaders() return self.try(receiveheaders(self.c)) end function metat.__index:receivebody(headers, sink, step) sink = sink or ltn12.sink.null() step = step or ltn12.pump.step local length = tonumber(headers["content-length"]) local t = headers["transfer-encoding"] -- shortcut local mode = "default" -- connection close if t and t ~= "identity" then mode = "http-chunked" elseif tonumber(headers["content-length"]) then mode = "by-length" end return self.try(ltn12.pump.all(socket.source(mode, self.c, length), sink, step)) end function metat.__index:receive09body(status, sink, step) local source = ltn12.source.rewind(socket.source("until-closed", self.c)) source(status) return self.try(ltn12.pump.all(source, sink, step)) end function metat.__index:close() return self.c:close() end ----------------------------------------------------------------------------- -- High level HTTP API ----------------------------------------------------------------------------- local function adjusturi(reqt) local u = reqt -- if there is a proxy, we need the full url. otherwise, just a part. if not reqt.proxy and not _M.PROXY then u = { path = socket.try(reqt.path, "invalid path 'nil'"), params = reqt.params, query = reqt.query, fragment = reqt.fragment } end return url.build(u) end local function adjustproxy(reqt) local proxy = reqt.proxy or _M.PROXY if proxy then proxy = url.parse(proxy) return proxy.host, proxy.port or 3128 else return reqt.host, reqt.port end end local function adjustheaders(reqt) -- default headers local host = reqt.host local port = tostring(reqt.port) if port ~= tostring(SCHEMES[reqt.scheme].port) then host = host .. ':' .. port end local lower = { ["user-agent"] = _M.USERAGENT, ["host"] = host, ["connection"] = "close, TE", ["te"] = "trailers" } -- if we have authentication information, pass it along if reqt.user and reqt.password then lower["authorization"] = "Basic " .. (mime.b64(reqt.user .. ":" .. url.unescape(reqt.password))) end -- if we have proxy authentication information, pass it along local proxy = reqt.proxy or _M.PROXY if proxy then proxy = url.parse(proxy) if proxy.user and proxy.password then lower["proxy-authorization"] = "Basic " .. (mime.b64(proxy.user .. ":" .. proxy.password)) end end -- override with user headers for i,v in pairs(reqt.headers or lower) do lower[string.lower(i)] = v end return lower end -- default url parts local default = { path ="/" , scheme = "http" } local function adjustrequest(reqt) -- parse url if provided local nreqt = reqt.url and url.parse(reqt.url, default) or {} -- explicit components override url for i,v in pairs(reqt) do nreqt[i] = v end -- default to scheme particulars local schemedefs, host, port, method = SCHEMES[nreqt.scheme], nreqt.host, nreqt.port, nreqt.method if not nreqt.create then nreqt.create = schemedefs.create(nreqt) end if not (port and port ~= '') then nreqt.port = schemedefs.port end if not (method and method ~= '') then nreqt.method = 'GET' end if not (host and host ~= "") then socket.try(nil, "invalid host '" .. tostring(nreqt.host) .. "'") end -- compute uri if user hasn't overriden nreqt.uri = reqt.uri or adjusturi(nreqt) -- adjust headers in request nreqt.headers = adjustheaders(nreqt) -- ajust host and port if there is a proxy nreqt.host, nreqt.port = adjustproxy(nreqt) return nreqt end local function shouldredirect(reqt, code, headers) local location = headers.location if not location then return false end location = string.gsub(location, "%s", "") if location == "" then return false end local scheme = url.parse(location).scheme if scheme and (not SCHEMES[scheme]) then return false end -- avoid https downgrades if ('https' == reqt.scheme) and ('https' ~= scheme) then return false end return (reqt.redirect ~= false) and (code == 301 or code == 302 or code == 303 or code == 307) and (not reqt.method or reqt.method == "GET" or reqt.method == "HEAD") and ((false == reqt.maxredirects) or ((reqt.nredirects or 0) < (reqt.maxredirects or 5))) end local function shouldreceivebody(reqt, code) if reqt.method == "HEAD" then return nil end if code == 204 or code == 304 then return nil end if code >= 100 and code < 200 then return nil end return 1 end -- forward declarations local trequest, tredirect --[[local]] function tredirect(reqt, location) -- the RFC says the redirect URL has to be absolute, but some -- servers do not respect that local newurl = url.absolute(reqt.url, location) -- if switching schemes, reset port and create function if url.parse(newurl).scheme ~= reqt.scheme then reqt.port = nil reqt.create = nil end -- make new request local result, code, headers, status = trequest { url = newurl, source = reqt.source, sink = reqt.sink, headers = reqt.headers, proxy = reqt.proxy, maxredirects = reqt.maxredirects, nredirects = (reqt.nredirects or 0) + 1, create = reqt.create } -- pass location header back as a hint we redirected headers = headers or {} headers.location = headers.location or location return result, code, headers, status end --[[local]] function trequest(reqt) -- we loop until we get what we want, or -- until we are sure there is no way to get it local nreqt = adjustrequest(reqt) local h = _M.open(nreqt.host, nreqt.port, nreqt.create) -- send request line and headers h:sendrequestline(nreqt.method, nreqt.uri) h:sendheaders(nreqt.headers) -- if there is a body, send it if nreqt.source then h:sendbody(nreqt.headers, nreqt.source, nreqt.step) end local code, status = h:receivestatusline() -- if it is an HTTP/0.9 server, simply get the body and we are done if not code then h:receive09body(status, nreqt.sink, nreqt.step) return 1, 200 elseif code == 408 then return 1, code end local headers -- ignore any 100-continue messages while code == 100 do headers = h:receiveheaders() code, status = h:receivestatusline() end headers = h:receiveheaders() -- at this point we should have a honest reply from the server -- we can't redirect if we already used the source, so we report the error if shouldredirect(nreqt, code, headers) and not nreqt.source then h:close() return tredirect(reqt, headers.location) end -- here we are finally done if shouldreceivebody(nreqt, code) then h:receivebody(headers, nreqt.sink, nreqt.step) end h:close() return 1, code, headers, status end -- turns an url and a body into a generic request local function genericform(u, b) local t = {} local reqt = { url = u, sink = ltn12.sink.table(t), target = t } if b then reqt.source = ltn12.source.string(b) reqt.headers = { ["content-length"] = string.len(b), ["content-type"] = "application/x-www-form-urlencoded" } reqt.method = "POST" end return reqt end _M.genericform = genericform local function srequest(u, b) local reqt = genericform(u, b) local _, code, headers, status = trequest(reqt) return table.concat(reqt.target), code, headers, status end _M.request = socket.protect(function(reqt, body) if type(reqt) == "string" then return srequest(reqt, body) else return trequest(reqt) end end) _M.schemes = SCHEMES return _M


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