@worker-tools/middleware/esm/utils/headers-set-cookie-fix.js

A suite of standalone HTTP server middlewares for Worker Runtimes.

const CONCAT_SEQ = ', ';
const XE = /(Mon|Tue|Wed|Thu|Fri|Sat|Sun), /;
const XR = '$1,�';
const YE = /(Mon|Tue|Wed|Thu|Fri|Sat|Sun),�/;
const YR = '$1, ';
/**
 * Fixes the iteration of the `Headers` class with respect to `set-cookie` header:
 *
 * By default, multiple `set-cookie` headers will be concatenated by the `Headers` class implementation.
 * However, the HTTP protocol/browsers expect multiple `Set-Cookie` headers,
 * and do not recognize concatenated `Set-Cookie` headers.
 *
 * This helper function fixes this behavior, yielding multiple `set-cookie` key-value tuples,
 * provided that no cookie value contains the concatenation sequence `', '` (comma empty-space).
 */
export function iterHeadersSetCookieFix(headers) {
    return [...headers].flatMap(([h, v]) => h === 'set-cookie'
        ? v.replace(new RegExp(XE, 'g'), XR)
            .split(CONCAT_SEQ)
            .map(x => [h, x.replace(new RegExp(YE, 'g'), YR)])
        : [[h, v]]);
}
export { iterHeadersSetCookieFix as headersSetCookieFix };
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