kequapp/dist/built-in/helpers/send-file.js

A minimal, zero-magic Node web framework built on native APIs

import fs from 'node:fs';
import path from 'node:path';
import guessContentType from "../../util/guess-content-type.js";
import Ex from "../tools/ex.js";
export default async function sendFile(req, res, location, contentType) {
    const asset = path.join(process.cwd(), location);
    const stats = await getStats(asset);
    res.setHeader('Content-Type', contentType ?? guessContentType(location));
    res.setHeader('Content-Length', stats.size);
    if (req.method === 'HEAD') {
        res.end();
        return;
    }
    try {
        await new Promise((resolve, reject) => {
            const stream = fs.createReadStream(asset);
            stream.pipe(res);
            stream.on('end', resolve);
            stream.on('error', reject);
            res.on('close', () => {
                stream.destroy();
            });
        });
    }
    catch (error) {
        throw Ex.InternalServerError(undefined, {
            location: asset,
            error,
        });
    }
}
async function getStats(location) {
    try {
        const stats = await fs.promises.stat(location);
        if (stats.isFile())
            return stats;
    }
    catch (_error) {
        // fail
    }
    throw Ex.NotFound(undefined, { location });
}