Elmar Kresse
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47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
import fs from 'fs';
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export function setCommonNoCacheHeaders(res) {
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res.setHeader('Cache-Control', 'no-store');
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res.setHeader('Accept-Ranges', 'bytes');
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}
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export function headFile(res, { size, mime }) {
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setCommonNoCacheHeaders(res);
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res.setHeader('Content-Type', mime);
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res.setHeader('Content-Length', size);
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res.status(200).end();
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}
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export function streamFile(req, res, { filePath, mime }) {
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const stat = fs.statSync(filePath);
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const size = stat.size;
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const range = req.headers.range;
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setCommonNoCacheHeaders(res);
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if (range) {
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const match = /bytes=(\d+)-(\d+)?/.exec(range);
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let start = match?.[1] ? parseInt(match[1], 10) : 0;
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let end = match?.[2] ? parseInt(match[2], 10) : size - 1;
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if (Number.isNaN(start)) start = 0;
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if (Number.isNaN(end)) end = size - 1;
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start = Math.min(Math.max(0, start), Math.max(0, size - 1));
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end = Math.min(Math.max(start, end), Math.max(0, size - 1));
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if (start > end || start >= size) {
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res.setHeader('Content-Range', `bytes */${size}`);
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return res.status(416).end();
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}
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const chunkSize = end - start + 1;
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res.writeHead(206, {
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'Content-Range': `bytes ${start}-${end}/${size}`,
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'Content-Length': chunkSize,
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'Content-Type': mime,
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});
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fs.createReadStream(filePath, { start, end }).pipe(res);
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} else {
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res.writeHead(200, {
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'Content-Length': size,
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'Content-Type': mime,
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});
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fs.createReadStream(filePath).pipe(res);
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}
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}
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