Korrith
35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
/**
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* Whether a dev-server API request came from the preview page itself.
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*
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* This is a cross-origin/CSRF control, NOT authorization. `Sec-Fetch-Site` is
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* client-supplied and the preview URL needs no credentials, so a crafted request
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* that sets the header still gets through. What it does stop: browser-driven
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* cross-origin writes, and clients that send no fetch metadata at all.
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*
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* Browsers label the preview's own same-origin `fetch` calls
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* `Sec-Fetch-Site: same-origin`. Hosts are compared rather than full origins
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* because the request reaches Vite over plain HTTP behind the proxy, which
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* forwards the original `Host`.
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*
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* @param {import('node:http').IncomingMessage} request
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* @returns {boolean}
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*/
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export function isSameOriginRequest(request) {
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const site = request.headers['sec-fetch-site'];
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if (site) {
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return site === 'same-origin';
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}
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// Pre-16.4 Safari omits fetch metadata but still sends `Origin` on POST.
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const origin = request.headers.origin;
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if (!origin) {
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return false;
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}
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try {
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return new URL(origin).host === request.headers.host;
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} catch {
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return false;
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}
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}
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