mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-14 20:40:17 -05:00
97 lines
2.9 KiB
CoffeeScript
97 lines
2.9 KiB
CoffeeScript
# This file is shared between the frontend and server code of web, so that
|
|
# filename validation is the same in both implementations.
|
|
# Both copies must be kept in sync:
|
|
# app/coffee/Features/Project/SafePath.coffee
|
|
# public/coffee/ide/directives/SafePath.coffee
|
|
|
|
load = () ->
|
|
BADCHAR_RX = ///
|
|
[
|
|
\/ # no forward slashes
|
|
\\ # no back slashes
|
|
\* # no asterisk
|
|
\u0000-\u001F # no control characters (0-31)
|
|
\u007F # no delete
|
|
\u0080-\u009F # no unicode control characters (C1)
|
|
\uD800-\uDFFF # no unicode surrogate characters
|
|
]
|
|
///g
|
|
|
|
BADFILE_RX = ///
|
|
(^\.$) # reject . as a filename
|
|
| (^\.\.$) # reject .. as a filename
|
|
| (^\s+) # reject leading space
|
|
| (\s+$) # reject trailing space
|
|
///g
|
|
|
|
# Put a block on filenames which match javascript property names, as they
|
|
# can cause exceptions where the code puts filenames into a hash. This is a
|
|
# temporary workaround until the code in other places is made safe against
|
|
# property names.
|
|
#
|
|
# The list of property names is taken from
|
|
# ['prototype'].concat(Object.getOwnPropertyNames(Object.prototype))
|
|
BLOCKEDFILE_RX = ///
|
|
^(
|
|
prototype
|
|
|constructor
|
|
|toString
|
|
|toLocaleString
|
|
|valueOf
|
|
|hasOwnProperty
|
|
|isPrototypeOf
|
|
|propertyIsEnumerable
|
|
|__defineGetter__
|
|
|__lookupGetter__
|
|
|__defineSetter__
|
|
|__lookupSetter__
|
|
|__proto__
|
|
)$
|
|
///
|
|
|
|
MAX_PATH = 1024 # Maximum path length, in characters. This is fairly arbitrary.
|
|
|
|
SafePath =
|
|
# convert any invalid characters to underscores in the given filename
|
|
clean: (filename) ->
|
|
filename = filename.replace BADCHAR_RX, '_'
|
|
# for BADFILE_RX replace any matches with an equal number of underscores
|
|
filename = filename.replace BADFILE_RX, (match) ->
|
|
return new Array(match.length + 1).join("_")
|
|
# replace blocked filenames 'prototype' with '@prototype'
|
|
filename = filename.replace BLOCKEDFILE_RX, "@$1"
|
|
return filename
|
|
|
|
# returns whether the filename is 'clean' (does not contain any invalid
|
|
# characters or reserved words)
|
|
isCleanFilename: (filename) ->
|
|
return SafePath.isAllowedLength(filename) &&
|
|
!BADCHAR_RX.test(filename) &&
|
|
!BADFILE_RX.test(filename)
|
|
|
|
isBlockedFilename: (filename) ->
|
|
return BLOCKEDFILE_RX.test(filename)
|
|
|
|
# returns whether a full path is 'clean' - e.g. is a full or relative path
|
|
# that points to a file, and each element passes the rules in 'isCleanFilename'
|
|
isCleanPath: (path) ->
|
|
elements = path.split('/')
|
|
|
|
lastElementIsEmpty = elements[elements.length - 1].length == 0
|
|
return false if lastElementIsEmpty
|
|
|
|
for element in elements
|
|
return false if element.length > 0 && !SafePath.isCleanFilename element
|
|
|
|
# check for a top-level reserved name
|
|
return false if BLOCKEDFILE_RX.test(path.replace(/^\/?/,'')) # remove leading slash if present
|
|
|
|
return true
|
|
|
|
isAllowedLength: (pathname) ->
|
|
return pathname.length > 0 && pathname.length <= MAX_PATH
|
|
|
|
if define?
|
|
define [], load
|
|
else
|
|
module.exports = load()
|