mirror of https://github.com/minio/minio.git
148 lines
4.1 KiB
Go
148 lines
4.1 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"crypto/md5"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"regexp"
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"strings"
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"unicode/utf8"
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"github.com/minio/minio/pkg/safe"
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)
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const (
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// Minio meta bucket.
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minioMetaBucket = ".minio"
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// Multipart meta prefix.
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mpartMetaPrefix = "multipart"
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// Tmp meta prefix.
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tmpMetaPrefix = "tmp"
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)
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// validBucket regexp.
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var validBucket = regexp.MustCompile(`^[a-z0-9][a-z0-9\.\-]{1,61}[a-z0-9]$`)
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// IsValidBucketName verifies a bucket name in accordance with Amazon's
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// requirements. It must be 3-63 characters long, can contain dashes
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// and periods, but must begin and end with a lowercase letter or a number.
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// See: http://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html
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func IsValidBucketName(bucket string) bool {
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if len(bucket) < 3 || len(bucket) > 63 {
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return false
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}
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if bucket[0] == '.' || bucket[len(bucket)-1] == '.' {
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return false
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}
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return validBucket.MatchString(bucket)
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}
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// IsValidObjectName verifies an object name in accordance with Amazon's
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// requirements. It cannot exceed 1024 characters and must be a valid UTF8
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// string.
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//
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// See:
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
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//
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// You should avoid the following characters in a key name because of
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// significant special handling for consistency across all
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// applications.
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//
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// Rejects strings with following characters.
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//
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// - Backslash ("\")
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// - Caret ("^")
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// - Grave accent / back tick ("`")
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// - Vertical bar / pipe ("|")
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func IsValidObjectName(object string) bool {
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if len(object) > 1024 || len(object) == 0 {
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return false
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}
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if !utf8.ValidString(object) {
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return false
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}
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// Reject unsupported characters in object name.
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return !strings.ContainsAny(object, "`^*|\\\"")
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}
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// IsValidObjectPrefix verifies whether the prefix is a valid object name.
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// Its valid to have a empty prefix.
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func IsValidObjectPrefix(object string) bool {
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// Prefix can be empty or "/".
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if object == "" || object == "/" {
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return true
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}
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// Verify if prefix is a valid object name.
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return IsValidObjectName(object)
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}
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// Slash separator.
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const slashSeparator = "/"
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// retainSlash - retains slash from a path.
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func retainSlash(s string) string {
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return strings.TrimSuffix(s, slashSeparator) + slashSeparator
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}
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// pathJoin - path join.
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func pathJoin(s1 string, s2 string) string {
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return retainSlash(s1) + s2
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}
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// Create an s3 compatible MD5sum for complete multipart transaction.
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func completeMultipartMD5(parts ...completePart) (string, error) {
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var finalMD5Bytes []byte
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for _, part := range parts {
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md5Bytes, err := hex.DecodeString(part.ETag)
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if err != nil {
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return "", err
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}
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finalMD5Bytes = append(finalMD5Bytes, md5Bytes...)
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}
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md5Hasher := md5.New()
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md5Hasher.Write(finalMD5Bytes)
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s3MD5 := fmt.Sprintf("%s-%d", hex.EncodeToString(md5Hasher.Sum(nil)), len(parts))
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return s3MD5, nil
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}
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// byBucketName is a collection satisfying sort.Interface.
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type byBucketName []BucketInfo
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func (d byBucketName) Len() int { return len(d) }
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func (d byBucketName) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
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func (d byBucketName) Less(i, j int) bool { return d[i].Name < d[j].Name }
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// safeCloseAndRemove - safely closes and removes underlying temporary
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// file writer if possible.
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func safeCloseAndRemove(writer io.WriteCloser) error {
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// If writer is a safe file, Attempt to close and remove.
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safeWriter, ok := writer.(*safe.File)
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if ok {
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return safeWriter.CloseAndRemove()
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}
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pipeWriter, ok := writer.(*io.PipeWriter)
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if ok {
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return pipeWriter.CloseWithError(errors.New("Close and error out."))
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}
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return nil
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}
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