Test whether or not a file is writable/readable/executable

is-rwx-able.js

exports.isReadable = isReadable
exports.isReadableSync = isReadableSync
exports.isWritable = isWritable
exports.isWritableSync = isWritableSync
exports.isExecutable = isExecutable
exports.isExecutableSync = isExecutableSync

function isReadable (path, cb) {
  fs.stat(path, function (er, s) {
    if (er) return cb(er)
    var mode = s.mode & 0777
    cb(null, ( (mode & 0004)
             ||(mode & 0040 && process.getgid() === s.gid)
             ||(mode & 0400 && process.getuid() === s.uid)))
  })
}

function isReadableSync (path) {
  var s = fs.statSync(path)
  var mode = s.mode & 0777
  return ( (mode & 0004)
         ||(mode & 0040 && process.getgid() === s.gid)
         ||(mode & 0400 && process.getuid() === s.uid)))
}

function isWritable (path, cb) {
  fs.stat(path, function (er, s) {
    if (er) return cb(er)
    var mode = s.mode & 0777
    cb(null, ( (mode & 0002)
             ||(mode & 0020 && process.getgid() === s.gid)
             ||(mode & 0200 && process.getuid() === s.uid)))
  })
}

function isWritableSync (path) {
  var s = fs.statSync(path)
  var mode = s.mode & 0777
  return ( (mode & 0002)
         ||(mode & 0020 && process.getgid() === s.gid)
         ||(mode & 0200 && process.getuid() === s.uid)))
}

function isExecutable (path, cb) {
  fs.stat(path, function (er, s) {
    if (er) return cb(er)
    var mode = s.mode & 0777
    cb(null, ( (mode & 0001)
             ||(mode & 0010 && process.getgid() === s.gid)
             ||(mode & 0100 && process.getuid() === s.uid)))
  })
}

function isExecutableSync (path) {
  var s = fs.statSync(path)
  var mode = s.mode & 0777
  return ( (mode & 0001)
         ||(mode & 0010 && process.getgid() === s.gid)
         ||(mode & 0100 && process.getuid() === s.uid)))
}