2016-02-20 01:04:29 +01:00
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/*
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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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2016-08-19 01:23:42 +02:00
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package cmd
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2016-02-20 01:04:29 +01:00
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import (
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2016-04-29 23:24:10 +02:00
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"crypto/md5"
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"encoding/hex"
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"fmt"
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2016-10-22 18:05:01 +02:00
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"io"
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2016-05-08 19:15:34 +02:00
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"path"
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2016-02-20 01:04:29 +01:00
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"regexp"
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2016-04-13 20:32:47 +02:00
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"strings"
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2016-02-20 01:04:29 +01:00
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"unicode/utf8"
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2016-04-29 23:24:10 +02:00
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2016-05-21 05:48:47 +02:00
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"github.com/skyrings/skyring-common/tools/uuid"
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2016-04-29 23:24:10 +02:00
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)
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const (
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// Minio meta bucket.
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minioMetaBucket = ".minio.sys"
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2016-05-04 01:10:24 +02:00
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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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2016-02-20 01:04:29 +01:00
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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]$`)
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var isIPAddress = regexp.MustCompile(`^(\d+\.){3}\d+$`)
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2016-02-20 01:04:29 +01:00
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2016-03-08 04:30:30 +01:00
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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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// Special case when bucket is equal to 'metaBucket'.
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if bucket == minioMetaBucket {
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return true
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}
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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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2016-07-16 02:30:37 +02:00
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return (validBucket.MatchString(bucket) &&
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!isIPAddress.MatchString(bucket) &&
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!strings.Contains(bucket, ".."))
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2016-02-20 01:04:29 +01:00
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}
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2016-03-08 04:30:30 +01:00
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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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//
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// additionally minio does not support object names with trailing "/".
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func IsValidObjectName(object string) bool {
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if len(object) == 0 {
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return false
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}
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if strings.HasSuffix(object, slashSeparator) {
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return false
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}
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if strings.HasPrefix(object, slashSeparator) {
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return false
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}
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return IsValidObjectPrefix(object)
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2016-02-20 01:04:29 +01:00
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}
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2016-03-23 00:03:08 +01:00
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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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if len(object) > 1024 {
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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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2016-10-01 01:56:36 +02:00
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if strings.ContainsAny(object, "\\") {
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return false
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}
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return true
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2016-03-23 00:03:08 +01:00
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}
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2016-04-16 20:43:03 +02:00
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2016-04-22 03:05:26 +02:00
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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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2016-05-08 19:15:34 +02:00
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// pathJoin - like path.Join() but retains trailing "/" of the last element
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2016-05-09 09:46:54 +02:00
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func pathJoin(elem ...string) string {
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trailingSlash := ""
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if len(elem) > 0 {
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if strings.HasSuffix(elem[len(elem)-1], slashSeparator) {
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trailingSlash = "/"
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}
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2016-05-08 19:15:34 +02:00
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}
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return path.Join(elem...) + trailingSlash
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}
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2016-04-29 23:24:10 +02:00
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2016-05-21 05:48:47 +02:00
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// getUUID() - get a unique uuid.
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func getUUID() (uuidStr string) {
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for {
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uuid, err := uuid.New()
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if err != nil {
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errorIf(err, "Unable to initialize uuid")
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continue
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}
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uuidStr = uuid.String()
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break
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}
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return uuidStr
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}
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2016-04-29 23:24:10 +02:00
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// Create an s3 compatible MD5sum for complete multipart transaction.
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func getCompleteMultipartMD5(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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2016-08-25 18:39:01 +02:00
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return "", traceError(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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2016-05-08 11:38:35 +02:00
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s3MD5 := fmt.Sprintf("%s-%d", hex.EncodeToString(md5Hasher.Sum(nil)), len(parts))
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2016-04-29 23:24:10 +02:00
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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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2016-10-22 18:05:01 +02:00
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// Copied from io.LimitReader()
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// limitReader returns a Reader that reads from r
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// but returns error after n bytes.
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// The underlying implementation is a *LimitedReader.
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type limitedReader struct {
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R io.Reader // underlying reader
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M int64 // min bytes remaining
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N int64 // max bytes remaining
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}
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2016-10-25 08:47:03 +02:00
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func limitReader(r io.Reader, m, n int64) io.Reader { return &limitedReader{r, m, n} }
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func (l *limitedReader) Read(p []byte) (n int, err error) {
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n, err = l.R.Read(p)
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l.N -= int64(n)
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l.M -= int64(n)
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if l.N < 0 {
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// If more data is available than what is expected we return error.
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return 0, errDataTooLarge
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}
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2016-10-25 08:47:03 +02:00
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if err == io.EOF && l.M > 0 {
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return 0, errDataTooSmall
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}
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2016-10-22 18:05:01 +02:00
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return
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}
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