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53 lines
1.1 KiB
53 lines
1.1 KiB
// Native
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const { createHash } = require('crypto');
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const path = require('path');
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// Packages
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const { readFile } = require('fs-promise');
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/**
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* Computes hashes for the contents of each file given.
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*
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* @param {Array} of {String} full paths
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* @return {Map}
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*/
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async function hashes(files, isStatic, pkg) {
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const map = new Map();
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await Promise.all(
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files.map(async name => {
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const filename = path.basename(name);
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let data;
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if (isStatic && filename === 'package.json') {
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const packageString = JSON.stringify(pkg, null, 2);
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data = Buffer.from(packageString);
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} else {
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data = await readFile(name);
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}
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const h = hash(data);
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const entry = map.get(h);
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if (entry) {
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entry.names.push(name);
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} else {
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map.set(hash(data), { names: [name], data });
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}
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})
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);
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return map;
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}
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/**
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* Computes a hash for the given buf.
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*
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* @param {Buffer} file data
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* @return {String} hex digest
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*/
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function hash(buf) {
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return createHash('sha1').update(buf).digest('hex');
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}
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module.exports = hashes;
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