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'use strict';
const fileType = require('file-type');
const isStream = require('is-stream');
const tarStream = require('tar-stream');
module.exports = () => input => {
if (!Buffer.isBuffer(input) && !isStream(input)) {
return Promise.reject(new TypeError(`Expected a Buffer or Stream, got ${typeof input}`));
}
if (Buffer.isBuffer(input) && (!fileType(input) || fileType(input).ext !== 'tar')) {
return Promise.resolve([]);
}
const extract = tarStream.extract();
const files = [];
extract.on('entry', (header, stream, cb) => {
const chunk = [];
stream.on('data', data => chunk.push(data));
stream.on('end', () => {
const file = {
data: Buffer.concat(chunk),
mode: header.mode,
mtime: header.mtime,
path: header.name,
type: header.type
};
if (header.type === 'symlink' || header.type === 'link') {
file.linkname = header.linkname;
}
files.push(file);
cb();
});
});
const promise = new Promise((resolve, reject) => {
if (!Buffer.isBuffer(input)) {
input.on('error', reject);
}
extract.on('finish', () => resolve(files));
extract.on('error', reject);
});
extract.then = promise.then.bind(promise);
extract.catch = promise.catch.bind(promise);
if (Buffer.isBuffer(input)) {
extract.end(input);
} else {
input.pipe(extract);
}
return extract;
};
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