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