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validateFilename.js
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validateFilename.js
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import createPackageURL from '../utils/createPackageURL.js';
function filenameRedirect(req, res) {
let filename;
if (req.query.module != null) {
// See https://github.com/rollup/rollup/wiki/pkg.module
filename = req.packageConfig.module || req.packageConfig['jsnext:main'];
if (!filename) {
// https://nodejs.org/api/esm.html#esm_code_package_json_code_code_type_code_field
if (req.packageConfig.type === 'module') {
// Use whatever is in pkg.main or index.js
filename = req.packageConfig.main || '/index.js';
} else if (
req.packageConfig.main &&
/\.mjs$/.test(req.packageConfig.main)
) {
// Use .mjs file in pkg.main
filename = req.packageConfig.main;
}
}
if (!filename) {
return res
.status(404)
.type('text')
.send(`Package ${req.packageSpec} does not contain an ES module`);
}
} else if (
req.query.main &&
req.packageConfig[req.query.main] &&
typeof req.packageConfig[req.query.main] === 'string'
) {
// Deprecated, see #63
filename = req.packageConfig[req.query.main];
} else if (
req.packageConfig.unpkg &&
typeof req.packageConfig.unpkg === 'string'
) {
filename = req.packageConfig.unpkg;
} else if (
req.packageConfig.browser &&
typeof req.packageConfig.browser === 'string'
) {
// Deprecated, see #63
filename = req.packageConfig.browser;
} else {
filename = req.packageConfig.main || '/index.js';
}
// Redirect to the exact filename so relative imports
// and URLs resolve correctly.
res
.set({
'Cache-Control': 'public, max-age=31536000', // 1 year
'Cache-Tag': 'redirect, filename-redirect'
})
.redirect(
302,
createPackageURL(
req.packageName,
req.packageVersion,
filename.replace(/^[./]*/, '/'),
req.query
)
);
}
/**
* Redirect to the exact filename if the request omits one.
*/
export default async function validateFilename(req, res, next) {
if (!req.filename) {
return filenameRedirect(req, res);
}
next();
}