7820380e
 “wangming”
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// Simple cookie handling implementation based on the standard RFC 6265.
//
// This module just has two functionalities:
// - Parse a set-cookie-header as a key value object
// - Write a cookie-string from a key value object
//
// All cookie attributes are ignored.
var unescape = require('querystring').unescape;
var COOKIE_PAIR = /^([^=\s]+)\s*=\s*("?)\s*(.*)\s*\2\s*$/;
var EXCLUDED_CHARS = /[\x00-\x1F\x7F\x3B\x3B\s\"\,\\"%]/g;
var TRAILING_SEMICOLON = /\x3B+$/;
var SEP_SEMICOLON = /\s*\x3B\s*/;
// i know these should be 'const', but I'd like to keep
// supporting earlier node.js versions as long as I can. :)
var KEY_INDEX = 1; // index of key from COOKIE_PAIR match
var VALUE_INDEX = 3; // index of value from COOKIE_PAIR match
// Returns a copy str trimmed and without trainling semicolon.
function cleanCookieString(str) {
return str.trim().replace(/\x3B+$/, '');
}
function getFirstPair(str) {
var index = str.indexOf('\x3B');
return index === -1 ? str : str.substr(0, index);
}
// Returns a encoded copy of str based on RFC6265 S4.1.1.
function encodeCookieComponent(str) {
return str.toString().replace(EXCLUDED_CHARS, encodeURIComponent);
}
// Parses a set-cookie-string based on the standard defined in RFC6265 S4.1.1.
function parseSetCookieString(str) {
str = cleanCookieString(str);
str = getFirstPair(str);
var res = COOKIE_PAIR.exec(str);
if (!res || !res[VALUE_INDEX]) return null;
return {
name : unescape(res[KEY_INDEX]),
value : unescape(res[VALUE_INDEX])
};
}
// Parses a set-cookie-header and returns a key/value object.
// Each key represents the name of a cookie.
function parseSetCookieHeader(header) {
if (!header) return {};
header = Array.isArray(header) ? header : [header];
return header.reduce(function(res, str) {
var cookie = parseSetCookieString(str);
if (cookie) res[cookie.name] = cookie.value;
return res;
}, {});
}
// Writes a set-cookie-string based on the standard definded in RFC6265 S4.1.1.
function writeCookieString(obj) {
return Object.keys(obj).reduce(function(str, name) {
var encodedName = encodeCookieComponent(name);
var encodedValue = encodeCookieComponent(obj[name]);
str += (str ? '; ' : '') + encodedName + '=' + encodedValue;
return str;
}, '');
}
// returns a key/val object from an array of cookie strings
exports.read = parseSetCookieHeader;
// writes a cookie string header
exports.write = writeCookieString;
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