mirror of https://github.com/minio/minio.git
401 lines
12 KiB
Go
401 lines
12 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015 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 fs
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import (
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"bytes"
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"io"
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"os"
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"path/filepath"
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"strings"
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"crypto/md5"
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"encoding/base64"
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"encoding/hex"
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"runtime"
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"github.com/minio/minio/pkg/atomic"
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"github.com/minio/minio/pkg/crypto/sha256"
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"github.com/minio/minio/pkg/disk"
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"github.com/minio/minio/pkg/ioutils"
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"github.com/minio/minio/pkg/mimedb"
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"github.com/minio/minio/pkg/probe"
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signV4 "github.com/minio/minio/pkg/signature"
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)
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/// Object Operations
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// GetObject - GET object
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func (fs Filesystem) GetObject(w io.Writer, bucket, object string, start, length int64) (int64, *probe.Error) {
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// Critical region requiring read lock.
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fs.rwLock.RLock()
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defer fs.rwLock.RUnlock()
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// Input validation.
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if !IsValidBucketName(bucket) {
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return 0, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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if !IsValidObjectName(object) {
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return 0, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// normalize buckets.
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bucket = fs.denormalizeBucket(bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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if _, e := os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return 0, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return 0, probe.NewError(e)
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}
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objectPath := filepath.Join(bucketPath, object)
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filestat, err := os.Stat(objectPath)
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switch err := err.(type) {
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case nil:
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if filestat.IsDir() {
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return 0, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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default:
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if os.IsNotExist(err) {
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return 0, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return 0, probe.NewError(err)
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}
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file, err := os.Open(objectPath)
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if err != nil {
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return 0, probe.NewError(err)
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}
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defer file.Close()
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_, err = file.Seek(start, os.SEEK_SET)
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if err != nil {
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return 0, probe.NewError(err)
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}
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var count int64
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if length > 0 {
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count, err = io.CopyN(w, file, length)
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if err != nil {
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return count, probe.NewError(err)
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}
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} else {
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count, err = io.Copy(w, file)
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if err != nil {
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return count, probe.NewError(err)
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}
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}
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return count, nil
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}
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// GetObjectMetadata - get object metadata.
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func (fs Filesystem) GetObjectMetadata(bucket, object string) (ObjectMetadata, *probe.Error) {
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// Input validation.
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if !IsValidBucketName(bucket) {
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return ObjectMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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if !IsValidObjectName(object) {
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return ObjectMetadata{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: bucket})
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}
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// Normalize buckets.
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bucket = fs.denormalizeBucket(bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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if _, e := os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return ObjectMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return ObjectMetadata{}, probe.NewError(e)
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}
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metadata, err := getMetadata(fs.path, bucket, object)
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if err != nil {
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return ObjectMetadata{}, err.Trace(bucket, object)
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}
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if metadata.Mode.IsDir() {
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return ObjectMetadata{}, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return metadata, nil
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}
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// getMetadata - get object metadata.
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func getMetadata(rootPath, bucket, object string) (ObjectMetadata, *probe.Error) {
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// Do not use filepath.Join() since filepath.Join strips off any
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// object names with '/', use them as is in a static manner so
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// that we can send a proper 'ObjectNotFound' reply back upon
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// os.Stat().
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var objectPath string
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// For windows use its special os.PathSeparator == "\\"
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if runtime.GOOS == "windows" {
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objectPath = rootPath + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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} else {
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objectPath = rootPath + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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}
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stat, err := os.Stat(objectPath)
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if err != nil {
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if os.IsNotExist(err) {
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return ObjectMetadata{}, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return ObjectMetadata{}, probe.NewError(err)
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}
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contentType := "application/octet-stream"
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if runtime.GOOS == "windows" {
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object = sanitizeWindowsPath(object)
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}
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if objectExt := filepath.Ext(object); objectExt != "" {
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content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
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if ok {
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contentType = content.ContentType
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}
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}
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metadata := ObjectMetadata{
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Bucket: bucket,
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Object: object,
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Created: stat.ModTime(),
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Size: stat.Size(),
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ContentType: contentType,
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Mode: stat.Mode(),
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}
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return metadata, nil
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}
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// isMD5SumEqual - returns error if md5sum mismatches, success its `nil`
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func isMD5SumEqual(expectedMD5Sum, actualMD5Sum string) bool {
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// Verify the md5sum.
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if expectedMD5Sum != "" && actualMD5Sum != "" {
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// Decode md5sum to bytes from their hexadecimal
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// representations.
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expectedMD5SumBytes, err := hex.DecodeString(expectedMD5Sum)
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if err != nil {
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return false
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}
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actualMD5SumBytes, err := hex.DecodeString(actualMD5Sum)
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if err != nil {
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return false
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}
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// Verify md5sum bytes are equal after successful decoding.
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if !bytes.Equal(expectedMD5SumBytes, actualMD5SumBytes) {
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return false
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}
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return true
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}
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return false
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}
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// CreateObject - create an object.
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func (fs Filesystem) CreateObject(bucket, object, expectedMD5Sum string, size int64, data io.Reader, sig *signV4.Signature) (ObjectMetadata, *probe.Error) {
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di, e := disk.GetInfo(fs.path)
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if e != nil {
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return ObjectMetadata{}, probe.NewError(e)
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}
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// Remove 5% from total space for cumulative disk space used for
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// journalling, inodes etc.
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availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
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if int64(availableDiskSpace) <= fs.minFreeDisk {
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return ObjectMetadata{}, probe.NewError(RootPathFull{Path: fs.path})
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}
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// Check bucket name valid.
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if !IsValidBucketName(bucket) {
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return ObjectMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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bucket = fs.denormalizeBucket(bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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if _, e = os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return ObjectMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return ObjectMetadata{}, probe.NewError(e)
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}
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// Verify object path legal.
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if !IsValidObjectName(object) {
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return ObjectMetadata{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// Get object path.
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objectPath := filepath.Join(bucketPath, object)
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if expectedMD5Sum != "" {
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var expectedMD5SumBytes []byte
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expectedMD5SumBytes, e = base64.StdEncoding.DecodeString(expectedMD5Sum)
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if e != nil {
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// Pro-actively close the connection.
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return ObjectMetadata{}, probe.NewError(InvalidDigest{MD5: expectedMD5Sum})
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}
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expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
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}
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// Write object.
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file, e := atomic.FileCreateWithPrefix(objectPath, expectedMD5Sum+"$tmpobject")
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if e != nil {
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switch e := e.(type) {
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case *os.PathError:
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if e.Op == "mkdir" {
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if strings.Contains(e.Error(), "not a directory") {
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return ObjectMetadata{}, probe.NewError(ObjectExistsAsPrefix{Bucket: bucket, Prefix: object})
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}
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}
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return ObjectMetadata{}, probe.NewError(e)
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default:
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return ObjectMetadata{}, probe.NewError(e)
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}
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}
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// Instantiate checksum hashers and create a multiwriter.
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md5Hasher := md5.New()
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sha256Hasher := sha256.New()
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objectWriter := io.MultiWriter(file, md5Hasher, sha256Hasher)
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if size > 0 {
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if _, e = io.CopyN(objectWriter, data, size); e != nil {
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file.CloseAndPurge()
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return ObjectMetadata{}, probe.NewError(e)
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}
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} else {
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if _, e = io.Copy(objectWriter, data); e != nil {
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file.CloseAndPurge()
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return ObjectMetadata{}, probe.NewError(e)
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}
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}
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md5Sum := hex.EncodeToString(md5Hasher.Sum(nil))
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// Verify if the written object is equal to what is expected, only
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// if it is requested as such.
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if expectedMD5Sum != "" {
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if !isMD5SumEqual(expectedMD5Sum, md5Sum) {
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file.CloseAndPurge()
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return ObjectMetadata{}, probe.NewError(BadDigest{MD5: expectedMD5Sum, Bucket: bucket, Object: object})
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}
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}
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sha256Sum := hex.EncodeToString(sha256Hasher.Sum(nil))
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if sig != nil {
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ok, err := sig.DoesSignatureMatch(sha256Sum)
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if err != nil {
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file.CloseAndPurge()
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return ObjectMetadata{}, err.Trace()
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}
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if !ok {
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file.CloseAndPurge()
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return ObjectMetadata{}, signV4.ErrSignDoesNotMath("Signature does not match")
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}
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}
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file.Close()
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// Set stat again to get the latest metadata.
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st, e := os.Stat(objectPath)
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if e != nil {
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return ObjectMetadata{}, probe.NewError(e)
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}
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contentType := "application/octet-stream"
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if objectExt := filepath.Ext(objectPath); objectExt != "" {
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content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
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if ok {
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contentType = content.ContentType
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}
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}
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newObject := ObjectMetadata{
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Bucket: bucket,
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Object: object,
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Created: st.ModTime(),
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Size: st.Size(),
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ContentType: contentType,
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MD5: md5Sum,
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}
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return newObject, nil
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}
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// deleteObjectPath - delete object path if its empty.
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func deleteObjectPath(basePath, deletePath, bucket, object string) *probe.Error {
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if basePath == deletePath {
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return nil
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}
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// Verify if the path exists.
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pathSt, e := os.Stat(deletePath)
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if e != nil {
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if os.IsNotExist(e) {
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return probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return probe.NewError(e)
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}
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if pathSt.IsDir() {
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// Verify if directory is empty.
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empty, e := ioutils.IsDirEmpty(deletePath)
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if e != nil {
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return probe.NewError(e)
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}
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if !empty {
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return nil
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}
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}
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// Attempt to remove path.
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if e := os.Remove(deletePath); e != nil {
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return probe.NewError(e)
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}
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// Recursively go down the next path and delete again.
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if err := deleteObjectPath(basePath, filepath.Dir(deletePath), bucket, object); err != nil {
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return err.Trace(basePath, deletePath, bucket, object)
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}
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return nil
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}
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// DeleteObject - delete object.
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func (fs Filesystem) DeleteObject(bucket, object string) *probe.Error {
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// Check bucket name valid
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if !IsValidBucketName(bucket) {
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return probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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bucket = fs.denormalizeBucket(bucket)
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bucketPath := filepath.Join(fs.path, bucket)
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// Check bucket exists
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if _, e := os.Stat(bucketPath); e != nil {
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if os.IsNotExist(e) {
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return probe.NewError(BucketNotFound{Bucket: bucket})
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}
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return probe.NewError(e)
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}
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// Verify object path legal
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if !IsValidObjectName(object) {
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return probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
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}
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// Do not use filepath.Join() since filepath.Join strips off any
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// object names with '/', use them as is in a static manner so
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// that we can send a proper 'ObjectNotFound' reply back upon
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// os.Stat().
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var objectPath string
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if runtime.GOOS == "windows" {
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objectPath = fs.path + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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} else {
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objectPath = fs.path + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
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}
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// Delete object path if its empty.
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err := deleteObjectPath(bucketPath, objectPath, bucket, object)
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if err != nil {
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if os.IsNotExist(err.ToGoError()) {
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return probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
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}
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return err.Trace(bucketPath, objectPath, bucket, object)
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}
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return nil
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}
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