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var signature = require('cookie-signature');
/**
* Parse signed cookies, returning an object
* containing the decoded key/value pairs,
* while removing the signed key from `obj`.
*
* @param {Object} obj
* @return {Object}
* @api private
*/
exports.signedCookies = function(obj, secret){
var cookies = Object.keys(obj);
var dec;
var key;
var ret = Object.create(null);
var val;
for (var i = 0; i < cookies.length; i++) {
key = cookies[i];
val = obj[key];
dec = exports.signedCookie(val, secret);
if (val !== dec) {
ret[key] = dec;
delete obj[key];
}
}
return ret;
};
/**
* Parse a signed cookie string, return the decoded value
*
* @param {String} str signed cookie string
* @param {String} secret
* @return {String} decoded value
* @api private
*/
exports.signedCookie = function(str, secret){
return str.substr(0, 2) === 's:'
? signature.unsign(str.slice(2), secret)
: str;
};
/**
* Parse JSON cookies.
*
* @param {Object} obj
* @return {Object}
* @api private
*/
exports.JSONCookies = function(obj){
var cookies = Object.keys(obj);
var key;
var val;
for (var i = 0; i < cookies.length; i++) {
key = cookies[i];
val = exports.JSONCookie(obj[key]);
if (val) {
obj[key] = val;
}
}
return obj;
};
/**
* Parse JSON cookie string
*
* @param {String} str
* @return {Object} Parsed object or null if not json cookie
* @api private
*/
exports.JSONCookie = function(str) {
if (!str || str.substr(0, 2) !== 'j:') return;
try {
return JSON.parse(str.slice(2));
} catch (err) {
// no op
}
};
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