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/*!

* socket.io-node

* Copyright(c) 2011 LearnBoost <dev@learnboost.com>

* MIT Licensed

*/

/**

* Module dependencies.

*/

/**

* Packet types.

*/

var packets = exports.packets = {

'disconnect': 0

, 'connect': 1

, 'heartbeat': 2

, 'message': 3

, 'json': 4

, 'event': 5

, 'ack': 6

, 'error': 7

, 'noop': 8

}

, packetslist = Object.keys(packets);

/**

* Errors reasons.

*/

var reasons = exports.reasons = {

'transport not supported': 0

, 'client not handshaken': 1

, 'unauthorized': 2

}

, reasonslist = Object.keys(reasons);

/**

* Errors advice.

*/

var advice = exports.advice = {

'reconnect': 0

}

, advicelist = Object.keys(advice);

/**

* Encodes a packet.

*

* @api private

*/

exports.encodePacket = function (packet) {

var type = packets[packet.type]

, id = packet.id || ''

, endpoint = packet.endpoint || ''

, ack = packet.ack

, data = null;

switch (packet.type) {

case 'message':

if (packet.data !== '')

data = packet.data;

break;

case 'event':

var ev = { name: packet.name };

if (packet.args && packet.args.length) {

ev.args = packet.args;

}

data = JSON.stringify(ev);

break;

case 'json':

data = JSON.stringify(packet.data);

break;

case 'ack':

data = packet.ackId

+ (packet.args && packet.args.length

? '+' + JSON.stringify(packet.args) : '');

break;

case 'connect':

if (packet.qs)

data = packet.qs;

break;

case 'error':

var reason = packet.reason ? reasons[packet.reason] : ''

, adv = packet.advice ? advice[packet.advice] : ''

if (reason !== '' || adv !== '')

data = reason + (adv !== '' ? ('+' + adv) : '')

break;

}

// construct packet with required fragments

var encoded = type + ':' + id + (ack == 'data' ? '+' : '') + ':' + endpoint;

// data fragment is optional

if (data !== null && data !== undefined)

encoded += ':' + data;

return encoded;

};

/**

* Encodes multiple messages (payload).

*

* @param {Array} messages

* @api private

*/

exports.encodePayload = function (packets) {

var decoded = '';

if (packets.length == 1)

return packets[0];

for (var i = 0, l = packets.length; i < l; i++) {

var packet = packets[i];

decoded += '\ufffd' + packet.length + '\ufffd' + packets[i]

}

return decoded;

};

/**

* Decodes a packet

*

* @api private

*/

var regexp = /([^:]+):([0-9]+)?(\+)?:([^:]+)?:?([\s\S]*)?/;

/**

* Wrap the JSON.parse in a seperate function the crankshaft optimizer will

* only punish this function for the usage for try catch

*

* @api private

*/

function parse (data) {

try { return JSON.parse(data) }

catch (e) { return false }

}

exports.decodePacket = function (data) {

var pieces = data.match(regexp);

if (!pieces) return {};

var id = pieces[2] || ''

, data = pieces[5] || ''

, packet = {

type: packetslist[pieces[1]]

, endpoint: pieces[4] || ''

};

// whether we need to acknowledge the packet

if (id) {

packet.id = id;

if (pieces[3])

packet.ack = 'data';

else

packet.ack = true;

}

// handle different packet types

switch (packet.type) {

case 'message':

packet.data = data || '';

break;

case 'event':

pieces = parse(data);

if (pieces) {

packet.name = pieces.name;

packet.args = pieces.args;

}

packet.args = packet.args || [];

break;

case 'json':

packet.data = parse(data);

break;

case 'connect':

packet.qs = data || '';

break;

case 'ack':

pieces = data.match(/^([0-9]+)(\+)?(.*)/);

if (pieces) {

packet.ackId = pieces[1];

packet.args = [];

if (pieces[3]) {

packet.args = parse(pieces[3]) || [];

}

}

break;

case 'error':

pieces = data.split('+');

packet.reason = reasonslist[pieces[0]] || '';

packet.advice = advicelist[pieces[1]] || '';

}

return packet;

};

/**

* Decodes data payload. Detects multiple messages

*

* @return {Array} messages

* @api public

*/

exports.decodePayload = function (data) {

if (undefined == data || null == data) {

return [];

}

if (data[0] == '\ufffd') {

var ret = [];

for (var i = 1, length = ''; i < data.length; i++) {

if (data[i] == '\ufffd') {

ret.push(exports.decodePacket(data.substr(i + 1, length)));

i += Number(length) + 1;

length = '';

} else {

length += data[i];

}

}

return ret;

} else {

return [exports.decodePacket(data)];

}

};