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53 lines
1.0 KiB
53 lines
1.0 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(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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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')
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.update(buf)
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.digest('hex')
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}
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module.exports = hashes
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