43 lines
1.0 KiB
Plaintext
43 lines
1.0 KiB
Plaintext
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import CachePolicy from "http-cache-semantics";
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async function loadRemoteImage(src) {
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const req = new Request(src);
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const res = await fetch(req);
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if (!res.ok) {
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throw new Error(
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`Failed to load remote image ${src}. The request did not return a 200 OK response. (received ${res.status}))`
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);
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}
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const policy = new CachePolicy(webToCachePolicyRequest(req), webToCachePolicyResponse(res));
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const expires = policy.storable() ? policy.timeToLive() : 0;
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return {
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data: Buffer.from(await res.arrayBuffer()),
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expires: Date.now() + expires
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};
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}
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function webToCachePolicyRequest({ url, method, headers: _headers }) {
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let headers = {};
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try {
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headers = Object.fromEntries(_headers.entries());
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} catch {
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}
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return {
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method,
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url,
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headers
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};
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}
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function webToCachePolicyResponse({ status, headers: _headers }) {
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let headers = {};
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try {
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headers = Object.fromEntries(_headers.entries());
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} catch {
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}
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return {
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status,
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headers
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};
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}
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export {
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loadRemoteImage
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};
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