-- Copyright (C) 2010 John Millikin <jmillikin@gmail.com>
-- 
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- any later version.
-- 
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
-- 
-- You should have received a copy of the GNU General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

{-# LANGUAGE OverloadedStrings #-}
module Network.Protocol.XMPP.Connections
	( Server (..)
	, xmlHeader
	, startOfStream
	, qnameStream
	) where
import Network (HostName, PortID)
import qualified Data.ByteString.Lazy as B
import qualified Data.Text.Lazy as T
import Data.Text.Lazy.Encoding (encodeUtf8)

import qualified Network.Protocol.XMPP.XML as X
import Network.Protocol.XMPP.JID (JID, formatJID)

data Server = Server
	{ serverJID      :: JID
	, serverHostname :: HostName
	, serverPort     :: PortID
	}

-- Since only the opening tag should be written, normal XML
-- serialization cannot be used. Be careful to escape any embedded
-- attributes.
xmlHeader :: T.Text -> JID -> B.ByteString
xmlHeader ns jid = encodeUtf8 header where
	attr x = T.concat ["\"", X.escape x, "\""]
	header = T.concat
		[ "<?xml version='1.0'?>\n"
		, "<stream:stream xmlns=" , attr ns
		, " to=", attr (formatJID jid)
		, " version=\"1.0\""
		, " xmlns:stream=\"http://etherx.jabber.org/streams\">"
		]

startOfStream :: Integer -> X.SaxEvent -> Bool
startOfStream depth event = case (depth, event) of
	(1, (X.BeginElement elemName _)) -> qnameStream == elemName
	_ -> False

qnameStream :: X.Name
qnameStream = X.Name "stream" (Just "http://etherx.jabber.org/streams") Nothing