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f14e48098a
* nit: use `node:` prefix everywhere * nit: fs/promises too * test: workaround issue in node builtin detection
42 lines
1.5 KiB
TypeScript
42 lines
1.5 KiB
TypeScript
import type { OutgoingHttpHeaders } from 'node:http';
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/**
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* Takes in a nullable WebAPI Headers object and produces a NodeJS OutgoingHttpHeaders object suitable for usage
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* with ServerResponse.writeHead(..) or ServerResponse.setHeader(..)
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*
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* @param webHeaders WebAPI Headers object
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* @returns NodeJS OutgoingHttpHeaders object with multiple set-cookie handled as an array of values
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*/
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export const createOutgoingHttpHeaders = (
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webHeaders: Headers | undefined | null
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): OutgoingHttpHeaders | undefined => {
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if (!webHeaders) {
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return undefined;
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}
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// re-type to access Header.getSetCookie()
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const headers = webHeaders as HeadersWithGetSetCookie;
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// at this point, a multi-value'd set-cookie header is invalid (it was concatenated as a single CSV, which is not valid for set-cookie)
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const nodeHeaders: OutgoingHttpHeaders = Object.fromEntries(headers.entries());
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if (Object.keys(nodeHeaders).length === 0) {
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return undefined;
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}
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// if there is > 1 set-cookie header, we have to fix it to be an array of values
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if (headers.has('set-cookie')) {
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const cookieHeaders = headers.getSetCookie();
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if (cookieHeaders.length > 1) {
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// the Headers.entries() API already normalized all header names to lower case so we can safely index this as 'set-cookie'
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nodeHeaders['set-cookie'] = cookieHeaders;
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}
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}
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return nodeHeaders;
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};
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interface HeadersWithGetSetCookie extends Headers {
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// the @astrojs/webapi polyfill makes this available (as of undici@5.19.0), but tsc doesn't pick it up on the built-in Headers type from DOM lib
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getSetCookie(): string[];
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}
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