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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local socket = require "socket"
local mime = require "mime"
local url = require "socket.url"
local server = require "net.server"
local connlisteners_get = require "net.connlisteners".get;
local listener = connlisteners_get("httpclient") or error("No httpclient listener!");
local t_insert, t_concat = table.insert, table.concat;
local tonumber, tostring, pairs, xpcall, select, debug_traceback, char, format =
tonumber, tostring, pairs, xpcall, select, debug.traceback, string.char, string.format;
local log = require "util.logger".init("http");
module "http"
function urlencode(s) return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end)); end
function urldecode(s) return s and (s:gsub("%%(%x%x)", function (c) return char(tonumber(c,16)); end)); end
local function expectbody(reqt, code)
if reqt.method == "HEAD" then return nil end
if code == 204 or code == 304 or code == 301 then return nil end
if code >= 100 and code < 200 then return nil end
return 1
end
local function request_reader(request, data, startpos)
if not data then
if request.body then
log("debug", "Connection closed, but we have data, calling callback...");
request.callback(t_concat(request.body), request.code, request);
elseif request.state ~= "completed" then
-- Error.. connection was closed prematurely
request.callback("connection-closed", 0, request);
return;
end
destroy_request(request);
request.body = nil;
request.state = "completed";
return;
end
if request.state == "body" and request.state ~= "completed" then
log("debug", "Reading body...")
if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.responseheaders["content-length"]); end
if startpos then
data = data:sub(startpos, -1)
end
t_insert(request.body, data);
if request.bodylength then
request.havebodylength = request.havebodylength + #data;
if request.havebodylength >= request.bodylength then
-- We have the body
log("debug", "Have full body, calling callback");
if request.callback then
request.callback(t_concat(request.body), request.code, request);
end
request.body = nil;
request.state = "completed";
else
log("debug", "Have "..request.havebodylength.." bytes out of "..request.bodylength);
end
end
elseif request.state == "headers" then
log("debug", "Reading headers...")
local pos = startpos;
local headers, headers_complete = request.responseheaders;
if not headers then
headers = {};
request.responseheaders = headers;
end
for line in data:sub(startpos, -1):gmatch("(.-)\r\n") do
startpos = startpos + #line + 2;
local k, v = line:match("(%S+): (.+)");
if k and v then
headers[k:lower()] = v;
--log("debug", "Header: "..k:lower().." = "..v);
elseif #line == 0 then
headers_complete = true;
break;
else
log("warn", "Unhandled header line: "..line);
end
end
if not headers_complete then return; end
-- Reached the end of the headers
if not expectbody(request, request.code) then
request.callback(nil, request.code, request);
return;
end
request.state = "body";
if #data > startpos then
return request_reader(request, data, startpos);
end
elseif request.state == "status" then
log("debug", "Reading status...")
local http, code, text, linelen = data:match("^HTTP/(%S+) (%d+) (.-)\r\n()", startpos);
code = tonumber(code);
if not code then
log("warn", "Invalid HTTP status line, telling callback then closing");
local ret = request.callback("invalid-status-line", 0, request);
destroy_request(request);
return ret;
end
request.code, request.responseversion = code, http;
if request.onlystatus then
if request.callback then
request.callback(nil, code, request);
end
destroy_request(request);
return;
end
request.state = "headers";
if #data > linelen then
return request_reader(request, data, linelen);
end
end
end
local function handleerr(err) log("error", "Traceback[http]: %s: %s", tostring(err), debug_traceback()); end
function request(u, ex, callback)
local req = url.parse(u);
if not (req and req.host) then
callback(nil, 0, req);
return nil, "invalid-url";
end
if not req.path then
req.path = "/";
end
local custom_headers, body;
local default_headers = { ["Host"] = req.host, ["User-Agent"] = "Prosody XMPP Server" }
if req.userinfo then
default_headers["Authorization"] = "Basic "..mime.b64(req.userinfo);
end
if ex then
custom_headers = ex.headers;
req.onlystatus = ex.onlystatus;
body = ex.body;
if body then
req.method = "POST ";
default_headers["Content-Length"] = tostring(#body);
default_headers["Content-Type"] = "application/x-www-form-urlencoded";
end
if ex.method then req.method = ex.method; end
end
req.handler, req.conn = server.wrapclient(socket.tcp(), req.host, req.port or 80, listener, "*a");
req.write = function (...) return req.handler:write(...); end
req.conn:settimeout(0);
local ok, err = req.conn:connect(req.host, req.port or 80);
if not ok and err ~= "timeout" then
callback(nil, 0, req);
return nil, err;
end
local request_line = { req.method or "GET", " ", req.path, " HTTP/1.1\r\n" };
if req.query then
t_insert(request_line, 4, "?");
t_insert(request_line, 5, req.query);
end
req.write(t_concat(request_line));
local t = { [2] = ": ", [4] = "\r\n" };
if custom_headers then
for k, v in pairs(custom_headers) do
t[1], t[3] = k, v;
req.write(t_concat(t));
default_headers[k] = nil;
end
end
for k, v in pairs(default_headers) do
t[1], t[3] = k, v;
req.write(t_concat(t));
default_headers[k] = nil;
end
req.write("\r\n");
if body then
req.write(body);
end
req.callback = function (content, code, request) log("debug", "Calling callback, status %s", code or "---"); return select(2, xpcall(function () return callback(content, code, request) end, handleerr)); end
req.reader = request_reader;
req.state = "status";
listener.register_request(req.handler, req);
return req;
end
function destroy_request(request)
if request.conn then
request.conn = nil;
request.handler:close()
listener.ondisconnect(request.handler, "closed");
end
end
_M.urlencode = urlencode;
return _M;
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