forked from rDrama/rDrama
155 lines
5.1 KiB
JavaScript
155 lines
5.1 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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function getStats (src, dest, opts) {
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const statFunc = opts.dereference
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? (file) => fs.stat(file, { bigint: true })
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: (file) => fs.lstat(file, { bigint: true })
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return Promise.all([
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statFunc(src),
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statFunc(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, opts) {
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let destStat
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const statFunc = opts.dereference
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? (file) => fs.statSync(file, { bigint: true })
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: (file) => fs.lstatSync(file, { bigint: true })
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const srcStat = statFunc(src)
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try {
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destStat = statFunc(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, opts, cb) {
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util.callbackify(getStats)(src, dest, opts, (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) {
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if (areIdentical(srcStat, destStat)) {
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const srcBaseName = path.basename(src)
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const destBaseName = path.basename(dest)
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if (funcName === 'move' &&
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srcBaseName !== destBaseName &&
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srcBaseName.toLowerCase() === destBaseName.toLowerCase()) {
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return cb(null, { srcStat, destStat, isChangingCase: true })
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}
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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() && !destStat.isDirectory()) {
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return cb(new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`))
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}
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if (!srcStat.isDirectory() && destStat.isDirectory()) {
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return cb(new Error(`Cannot overwrite directory '${dest}' with non-directory '${src}'.`))
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}
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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, opts) {
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const { srcStat, destStat } = getStatsSync(src, dest, opts)
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if (destStat) {
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if (areIdentical(srcStat, destStat)) {
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const srcBaseName = path.basename(src)
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const destBaseName = path.basename(dest)
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if (funcName === 'move' &&
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srcBaseName !== destBaseName &&
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srcBaseName.toLowerCase() === destBaseName.toLowerCase()) {
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return { srcStat, destStat, isChangingCase: true }
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}
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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() && !destStat.isDirectory()) {
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throw new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`)
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}
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if (!srcStat.isDirectory() && destStat.isDirectory()) {
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throw new Error(`Cannot overwrite directory '${dest}' with non-directory '${src}'.`)
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}
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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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fs.stat(destParent, { bigint: true }, (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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}
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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 = fs.statSync(destParent, { bigint: true })
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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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return destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev
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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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areIdentical
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}
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