85 lines
3.4 KiB
JavaScript
85 lines
3.4 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.cookieCompare = cookieCompare;
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/**
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* The maximum timestamp a cookie, in milliseconds. The value is (2^31 - 1) seconds since the Unix
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* epoch, corresponding to 2038-01-19.
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*/
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const MAX_TIME = 2147483647000;
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/**
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* A comparison function that can be used with {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort | Array.sort()},
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* which orders a list of cookies into the recommended order given in Step 2 of {@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.4 | RFC6265 - Section 5.4}.
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*
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* The sort algorithm is, in order of precedence:
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*
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* - Longest {@link Cookie.path}
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*
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* - Oldest {@link Cookie.creation} (which has a 1-ms precision, same as Date)
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*
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* - Lowest {@link Cookie.creationIndex} (to get beyond the 1-ms precision)
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*
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* @remarks
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* ### RFC6265 - Section 5.4 - Step 2
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*
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* The user agent SHOULD sort the cookie-list in the following order:
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*
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* - Cookies with longer paths are listed before cookies with shorter paths.
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*
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* - Among cookies that have equal-length path fields, cookies with
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* earlier creation-times are listed before cookies with later
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* creation-times.
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*
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* NOTE: Not all user agents sort the cookie-list in this order, but
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* this order reflects common practice when this document was
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* written, and, historically, there have been servers that
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* (erroneously) depended on this order.
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*
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* ### Custom Store Implementors
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*
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* Since the JavaScript Date is limited to a 1-ms precision, cookies within the same millisecond are entirely possible.
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* This is especially true when using the `now` option to `CookieJar.setCookie(...)`. The {@link Cookie.creationIndex}
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* property is a per-process global counter, assigned during construction with `new Cookie()`, which preserves the spirit
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* of the RFC sorting: older cookies go first. This works great for {@link MemoryCookieStore} since `Set-Cookie` headers
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* are parsed in order, but is not so great for distributed systems.
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*
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* Sophisticated Stores may wish to set this to some other
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* logical clock so that if cookies `A` and `B` are created in the same millisecond, but cookie `A` is created before
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* cookie `B`, then `A.creationIndex < B.creationIndex`.
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*
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* @example
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* ```
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* const cookies = [
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* new Cookie({ key: 'a', value: '' }),
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* new Cookie({ key: 'b', value: '' }),
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* new Cookie({ key: 'c', value: '', path: '/path' }),
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* new Cookie({ key: 'd', value: '', path: '/path' }),
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* ]
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* cookies.sort(cookieCompare)
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* // cookie sort order would be ['c', 'd', 'a', 'b']
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* ```
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*
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* @param a - the first Cookie for comparison
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* @param b - the second Cookie for comparison
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* @public
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*/
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function cookieCompare(a, b) {
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let cmp;
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// descending for length: b CMP a
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const aPathLen = a.path ? a.path.length : 0;
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const bPathLen = b.path ? b.path.length : 0;
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cmp = bPathLen - aPathLen;
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if (cmp !== 0) {
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return cmp;
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}
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// ascending for time: a CMP b
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const aTime = a.creation && a.creation instanceof Date ? a.creation.getTime() : MAX_TIME;
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const bTime = b.creation && b.creation instanceof Date ? b.creation.getTime() : MAX_TIME;
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cmp = aTime - bTime;
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if (cmp !== 0) {
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return cmp;
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}
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// break ties for the same millisecond (precision of JavaScript's clock)
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cmp = (a.creationIndex || 0) - (b.creationIndex || 0);
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return cmp;
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}
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