67 lines
2.5 KiB
JavaScript
67 lines
2.5 KiB
JavaScript
import { createReadStream, statSync } from 'node:fs';
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import { extname, isAbsolute } from 'node:path';
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import { join } from 'node:path';
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import mime from 'mime';
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import { createETag } from './utils.js';
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export const enableCaching = (res, caching) => {
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let cc = caching.maxAge != null && `public,max-age=${caching.maxAge}`;
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if (cc && caching.immutable)
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cc += ',immutable';
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else if (cc && caching.maxAge === 0)
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cc += ',must-revalidate';
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if (cc)
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res.setHeader('Cache-Control', cc);
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};
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/**
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* Sends a file by piping a stream to response.
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*
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* It also checks for extension to set a proper `Content-Type` header.
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*
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* Path argument must be absolute. To use a relative path, specify the `root` option first.
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*
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* @param res Response
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*/
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export const sendFile = (req, res) => (path, opts = {}, cb) => {
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const { root, headers = {}, encoding = 'utf-8', caching, ...options } = opts;
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if (!isAbsolute(path) && !root)
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throw new TypeError('path must be absolute');
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if (caching)
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enableCaching(res, caching);
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const filePath = root ? join(root, path) : path;
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const stats = statSync(filePath);
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headers['Content-Encoding'] = encoding;
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headers['Last-Modified'] = stats.mtime.toUTCString();
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headers.ETag = createETag(stats, encoding);
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if (!res.getHeader('Content-Type'))
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headers['Content-Type'] = `${mime.getType(extname(path))}; charset=utf-8`;
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let status = res.statusCode || 200;
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if (req.headers.range) {
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status = 206;
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const [x, y] = req.headers.range.replace('bytes=', '').split('-');
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const end = (options.end = Number.parseInt(y, 10) || stats.size - 1);
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const start = (options.start = Number.parseInt(x, 10) || 0);
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if (start >= stats.size || end >= stats.size) {
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res
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.writeHead(416, {
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'Content-Range': `bytes */${stats.size}`
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})
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.end();
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return res;
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}
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headers['Content-Range'] = `bytes ${start}-${end}/${stats.size}`;
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headers['Content-Length'] = end - start + 1;
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headers['Accept-Ranges'] = 'bytes';
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}
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else {
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headers['Content-Length'] = stats.size;
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}
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for (const [k, v] of Object.entries(headers))
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res.setHeader(k, v);
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res.writeHead(status, headers);
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const stream = createReadStream(filePath, options);
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if (cb)
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stream.on('error', (err) => cb(err)).on('end', () => cb());
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stream.pipe(res);
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return res;
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};
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//# sourceMappingURL=sendFile.js.map
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