21 lines
766 B
JavaScript
21 lines
766 B
JavaScript
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//@ts-check
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/**
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* Does a best guess attempt at finding out the size of a file from a request headers.
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* To access headers, server must send CORS header
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* `Access-Control-Expose-Headers: content-encoding, content-length x-file-size`
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* server must send the custom `x-file-size` header if gzip or other content-encoding is used.
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* @param {Headers} headers
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*/
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export const decodeContentLength = (headers) => {
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const contentEncoding = headers.get("content-encoding");
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const contentLength =
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headers.get(contentEncoding ? "x-file-size" : "content-length") ||
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(headers.has("content-range") &&
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/**@type {string}*/ (headers.get("content-range")).split("/")[1]) ||
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"0";
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return parseInt(contentLength, 10);
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};
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export default decodeContentLength;
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