140 lines
4.5 KiB
JavaScript
140 lines
4.5 KiB
JavaScript
'use strict'
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const fs = require('../fs')
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const path = require('path')
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const util = require('util')
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const atLeastNode = require('at-least-node')
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const nodeSupportsBigInt = atLeastNode('10.5.0')
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const stat = (file) => nodeSupportsBigInt ? fs.stat(file, { bigint: true }) : fs.stat(file)
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const statSync = (file) => nodeSupportsBigInt ? fs.statSync(file, { bigint: true }) : fs.statSync(file)
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function getStats (src, dest) {
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return Promise.all([
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stat(src),
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stat(dest).catch(err => {
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if (err.code === 'ENOENT') return null
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throw err
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})
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]).then(([srcStat, destStat]) => ({ srcStat, destStat }))
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}
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function getStatsSync (src, dest) {
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let destStat
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const srcStat = statSync(src)
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try {
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destStat = statSync(dest)
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} catch (err) {
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if (err.code === 'ENOENT') return { srcStat, destStat: null }
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throw err
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}
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return { srcStat, destStat }
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}
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function checkPaths (src, dest, funcName, cb) {
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util.callbackify(getStats)(src, dest, (err, stats) => {
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if (err) return cb(err)
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const { srcStat, destStat } = stats
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if (destStat && areIdentical(srcStat, destStat)) {
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return cb(new Error('Source and destination must not be the same.'))
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}
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if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
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return cb(new Error(errMsg(src, dest, funcName)))
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}
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return cb(null, { srcStat, destStat })
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})
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}
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function checkPathsSync (src, dest, funcName) {
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const { srcStat, destStat } = getStatsSync(src, dest)
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if (destStat && areIdentical(srcStat, destStat)) {
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throw new Error('Source and destination must not be the same.')
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}
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if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
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throw new Error(errMsg(src, dest, funcName))
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}
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return { srcStat, destStat }
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}
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// recursively check if dest parent is a subdirectory of src.
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// It works for all file types including symlinks since it
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// checks the src and dest inodes. It starts from the deepest
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// parent and stops once it reaches the src parent or the root path.
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function checkParentPaths (src, srcStat, dest, funcName, cb) {
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const srcParent = path.resolve(path.dirname(src))
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const destParent = path.resolve(path.dirname(dest))
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if (destParent === srcParent || destParent === path.parse(destParent).root) return cb()
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const callback = (err, destStat) => {
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if (err) {
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if (err.code === 'ENOENT') return cb()
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return cb(err)
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}
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if (areIdentical(srcStat, destStat)) {
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return cb(new Error(errMsg(src, dest, funcName)))
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}
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return checkParentPaths(src, srcStat, destParent, funcName, cb)
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}
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if (nodeSupportsBigInt) fs.stat(destParent, { bigint: true }, callback)
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else fs.stat(destParent, callback)
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}
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function checkParentPathsSync (src, srcStat, dest, funcName) {
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const srcParent = path.resolve(path.dirname(src))
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const destParent = path.resolve(path.dirname(dest))
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if (destParent === srcParent || destParent === path.parse(destParent).root) return
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let destStat
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try {
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destStat = statSync(destParent)
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} catch (err) {
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if (err.code === 'ENOENT') return
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throw err
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}
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if (areIdentical(srcStat, destStat)) {
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throw new Error(errMsg(src, dest, funcName))
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}
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return checkParentPathsSync(src, srcStat, destParent, funcName)
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}
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function areIdentical (srcStat, destStat) {
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if (destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
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if (nodeSupportsBigInt || destStat.ino < Number.MAX_SAFE_INTEGER) {
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// definitive answer
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return true
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}
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// Use additional heuristics if we can't use 'bigint'.
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// Different 'ino' could be represented the same if they are >= Number.MAX_SAFE_INTEGER
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// See issue 657
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if (destStat.size === srcStat.size &&
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destStat.mode === srcStat.mode &&
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destStat.nlink === srcStat.nlink &&
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destStat.atimeMs === srcStat.atimeMs &&
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destStat.mtimeMs === srcStat.mtimeMs &&
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destStat.ctimeMs === srcStat.ctimeMs &&
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destStat.birthtimeMs === srcStat.birthtimeMs) {
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// heuristic answer
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return true
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}
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}
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return false
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}
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// return true if dest is a subdir of src, otherwise false.
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// It only checks the path strings.
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function isSrcSubdir (src, dest) {
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const srcArr = path.resolve(src).split(path.sep).filter(i => i)
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const destArr = path.resolve(dest).split(path.sep).filter(i => i)
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return srcArr.reduce((acc, cur, i) => acc && destArr[i] === cur, true)
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}
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function errMsg (src, dest, funcName) {
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return `Cannot ${funcName} '${src}' to a subdirectory of itself, '${dest}'.`
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}
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module.exports = {
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checkPaths,
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checkPathsSync,
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checkParentPaths,
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checkParentPathsSync,
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isSrcSubdir
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}
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