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92 lines
2.9 KiB
JavaScript
92 lines
2.9 KiB
JavaScript
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/** @module */
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'use strict'
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const path = require('path')
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/**
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* Regular expressions for Overleaf v2 taken from
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* https://github.com/sharelatex/web-sharelatex/blob/master/app/coffee/Features/Project/SafePath.coffee
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*/
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//
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// Regex of characters that are invalid in filenames
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//
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// eslint-disable-next-line no-control-regex
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const BAD_CHAR_RX = /[/*\u0000-\u001F\u007F\u0080-\u009F\uD800-\uDFFF]/g
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//
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// Regex of filename patterns that are invalid ("." ".." and leading/trailing
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// whitespace)
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//
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const BAD_FILE_RX = /(^\.$)|(^\.\.$)|(^\s+)|(\s+$)/g
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//
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// Put a block on filenames which match javascript property names, as they
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// can cause exceptions where the code puts filenames into a hash. This is a
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// temporary workaround until the code in other places is made safe against
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// property names.
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//
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// See https://github.com/overleaf/write_latex/wiki/Using-javascript-Objects-as-Maps
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//
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const BLOCKED_FILE_RX =
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/^(prototype|constructor|toString|toLocaleString|valueOf|hasOwnProperty|isPrototypeOf|propertyIsEnumerable|__defineGetter__|__lookupGetter__|__defineSetter__|__lookupSetter__|__proto__)$/
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//
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// Maximum path length, in characters. This is fairly arbitrary.
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//
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const MAX_PATH = 1024
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/**
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* Replace invalid characters and filename patterns in a filename with
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* underscores.
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*/
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function cleanPart(filename) {
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filename = filename.replace(BAD_CHAR_RX, '_')
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filename = filename.replace(BAD_FILE_RX, function (match) {
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return new Array(match.length + 1).join('_')
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})
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return filename
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}
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/**
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* All pathnames in a Snapshot must be clean. We want pathnames that:
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*
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* 1. are unambiguous (e.g. no `.`s or redundant path separators)
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* 2. do not allow directory traversal attacks (e.g. no `..`s or absolute paths)
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* 3. do not contain leading/trailing space
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* 4. do not contain the character '*' in filenames
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*
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* We normalise the pathname, split it by the separator and then clean each part
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* as a filename
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*
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* @param {string} pathname
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* @return {String}
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*/
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exports.clean = function (pathname) {
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pathname = path.normalize(pathname)
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pathname = pathname.replace(/\\/g, '/') // workaround for IE
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pathname = pathname.replace(/\/+/g, '/') // no multiple slashes
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pathname = pathname.replace(/^(\/.*)$/, '_$1') // no leading /
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pathname = pathname.replace(/^(.+)\/$/, '$1') // no trailing /
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pathname = pathname.replace(/^ *(.*)$/, '$1') // no leading spaces
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pathname = pathname.replace(/^(.*[^ ]) *$/, '$1') // no trailing spaces
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if (pathname.length === 0) pathname = '_'
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pathname = pathname.split('/').map(cleanPart).join('/')
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pathname = pathname.replace(BLOCKED_FILE_RX, '@$1')
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return pathname
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}
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/**
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* A pathname is clean (see clean) and not too long.
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*
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* @param {string} pathname
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* @return {Boolean}
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*/
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exports.isClean = function pathnameIsClean(pathname) {
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return (
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exports.clean(pathname) === pathname &&
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pathname.length <= MAX_PATH &&
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pathname.length > 0
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)
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}
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