-- 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 b64 = require "util.encodings".base64.encode;

local url = require "socket.url"

local httpstream_new = require "net.http.parser".new;

local util_http = require "util.http";

local ssl_available = pcall(require, "ssl");

local server = require "net.server"

local t_insert, t_concat = table.insert, table.concat;

local pairs = pairs;

local tonumber, tostring, xpcall, select, traceback =

      tonumber, tostring, xpcall, select, debug.traceback;

local assert, error = assert, error

local log = require "util.logger".init("http");

local _ENV = nil;

local requests = {}; -- Open requests

local listener = { default_port = 80, default_mode = "*a" };

function listener.onconnect(conn)

	local req = requests[conn];

	-- Send the request

	local request_line = { req.method or "GET", " ", req.path, " HTTP/1.1\r\n" };

	if req.query then

		t_insert(request_line, 4, "?"..req.query);

	end

	conn:write(t_concat(request_line));

	local t = { [2] = ": ", [4] = "\r\n" };

	for k, v in pairs(req.headers) do

		t[1], t[3] = k, v;

		conn:write(t_concat(t));

	end

	conn:write("\r\n");

	if req.body then

		conn:write(req.body);

	end

end

function listener.onincoming(conn, data)

	local request = requests[conn];

	if not request then

		log("warn", "Received response from connection %s with no request attached!", tostring(conn));

		return;

	end

	if data and request.reader then

		request:reader(data);

	end

end

function listener.ondisconnect(conn, err)

	local request = requests[conn];

	if request and request.conn then

		request:reader(nil, err);

	end

	requests[conn] = nil;

end

function listener.ondetach(conn)

	requests[conn] = nil;

end

local function destroy_request(request)

	if request.conn then

		request.conn = nil;

		request.handler:close()

	end

end

local function request_reader(request, data, err)

	if not request.parser then

		local function error_cb(reason)

			if request.callback then

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

				request.callback = nil;

			end

			destroy_request(request);

		end

		if not data then

			error_cb(err);

			return;

		end

		local function success_cb(r)

			if request.callback then

				request.callback(r.body, r.code, r, 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", traceback(tostring(err), 2)); end

local 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 method, headers, body;

	local host, port = req.host, req.port;

	local host_header = host;

	if (port == "80" and req.scheme == "http")

	or (port == "443" and req.scheme == "https") then

		port = nil;

	elseif port then

		host_header = host_header..":"..port;

	end

	headers = {

		["Host"] = host_header;

		["User-Agent"] = "Prosody XMPP Server";

	};

	if req.userinfo then

		headers["Authorization"] = "Basic "..b64(req.userinfo);

	end

	if ex then

		req.onlystatus = ex.onlystatus;

		body = ex.body;

		if body then

			method = "POST";

			headers["Content-Length"] = tostring(#body);

			headers["Content-Type"] = "application/x-www-form-urlencoded";

		end

		if ex.method then method = ex.method; end

		if ex.headers then

			for k, v in pairs(ex.headers) do

				headers[k] = v;

			end

		end

	end

	-- Attach to request object

	req.method, req.headers, req.body = method, headers, body;

	local using_https = req.scheme == "https";

	if using_https and not ssl_available then

		error("SSL not available, unable to contact https URL");

	end

	local port_number = port and tonumber(port) or (using_https and 443 or 80);

	local sslctx = false;

	if using_https then

		sslctx = ex and ex.sslctx or { mode = "client", protocol = "sslv23", options = { "no_sslv2", "no_sslv3" } };

	end

	local handler, conn = server.addclient(host, port_number, listener, "*a", sslctx)

	if not handler then

		callback(nil, 0, req);

		return nil, conn;

	end

	req.handler, req.conn = handler, conn

	req.write = function (...) return req.handler:write(...); end

	req.callback = function (content, code, request, response) log("debug", "Calling callback, status %s", code or "---"); return select(2, xpcall(function () return callback(content, code, request, response) end, handleerr)); end

	req.reader = request_reader;

	req.state = "status";

	requests[req.handler] = req;

	return req;

end

return {

	request = request;

	-- COMPAT

	urlencode = util_http.urlencode;

	urldecode = util_http.urldecode;

	formencode = util_http.formencode;

	formdecode = util_http.formdecode;

};