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minio/fs-utils.go

100 lines
2.6 KiB

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"regexp"
"runtime"
"strings"
"unicode/utf8"
)
// validVolname regexp.
var validVolname = regexp.MustCompile(`^.{3,63}$`)
// isValidVolname verifies a volname name in accordance with object
// layer requirements.
func isValidVolname(volname string) bool {
if !validVolname.MatchString(volname) {
return false
}
switch runtime.GOOS {
case "windows":
// Volname shouldn't have reserved characters on windows in it.
return !strings.ContainsAny(volname, "/\\:*?\"<>|")
default:
// Volname shouldn't have '/' in it.
return !strings.ContainsAny(volname, "/")
}
}
// Keeping this as lower bound value supporting Linux, Darwin and Windows operating systems.
const pathMax = 4096
// isValidPath verifies if a path name is in accordance with FS limitations.
func isValidPath(path string) bool {
// TODO: Make this FSType or Operating system specific.
if len(path) > pathMax || len(path) == 0 {
return false
}
if !utf8.ValidString(path) {
return false
}
return true
}
// isValidPrefix verifies where the prefix is a valid path.
func isValidPrefix(prefix string) bool {
// Prefix can be empty.
if prefix == "" || prefix == "/" {
return true
}
// Verify if prefix is a valid path.
return isValidPath(prefix)
}
// List of reserved words for files, includes old and new ones.
var reservedKeywords = []string{
"$multiparts",
"$tmpobject",
"$tmpfile",
// Add new reserved words if any used in future.
}
// hasReservedPrefix - returns true if name has a reserved keyword suffixed.
func hasReservedSuffix(name string) (isReserved bool) {
for _, reservedKey := range reservedKeywords {
if strings.HasSuffix(name, reservedKey) {
isReserved = true
break
}
isReserved = false
}
return isReserved
}
// hasReservedPrefix - has reserved prefix.
func hasReservedPrefix(name string) (isReserved bool) {
for _, reservedKey := range reservedKeywords {
if strings.HasPrefix(name, reservedKey) {
isReserved = true
break
}
isReserved = false
}
return isReserved
}