-- 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 httpstream_new = require "util.httpstream".new;

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 pairs, ipairs = pairs, ipairs;

local tonumber, tostring, xpcall, select, debug_traceback, char, format =

      tonumber, tostring, 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 _formencodepart(s)

	return s and (s:gsub("%W", function (c)

		if c ~= " " then

			return format("%%%02x", c:byte());

		else

			return "+";

		end

	end));

end

function formencode(form)

	local result = {};

	for _, field in ipairs(form) do

		t_insert(result, _formencodepart(field.name).."=".._formencodepart(field.value));

	end

	return t_concat(result, "&");

end

function formdecode(s)

	if not s:match("=") then return urldecode(s); end

	local r = {};

	for k, v in s:gmatch("([^=&]*)=([^&]*)") do

		k, v = k:gsub("%+", "%%20"), v:gsub("%+", "%%20");

		k, v = urldecode(k), urldecode(v);

		t_insert(r, { name = k, value = v });

		r[k] = v;

	end

	return r;

end

local function request_reader(request, data, startpos)

	if not request.parser then

		if not data then return; end

		local function success_cb(r)

			if request.callback then

				for k,v in pairs(r) do request[k] = v; end

				request.callback(r.body, r.code, request);

				request.callback = nil;

			end

			destroy_request(request);

		end

		local function error_cb(r)

			if request.callback then

				request.callback(r or "connection-closed", 0, request);

				request.callback = nil;

			end

			destroy_request(request);

		end

		local function options_cb()

			return request;

		end

		request.parser = httpstream_new(success_cb, error_cb, "client", options_cb);

	end

	request.parser:feed(data);

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

	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;