// CompleteMultipartUpload - complete a multipart upload and persist the data
func (fs Filesystem) CompleteMultipartUpload(bucket, object, uploadID string, data io.Reader, signature *signV4.Signature) (ObjectMetadata, *probe.Error) {
// Check bucket name is valid.
if !IsValidBucketName(bucket) {
return ObjectMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
// Verify object path is legal.
if !IsValidObjectName(object) {
return ObjectMetadata{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// Verify if valid upload for incoming object.
if !fs.isValidUploadID(object, uploadID) {
return ObjectMetadata{}, probe.NewError(InvalidUploadID{UploadID: uploadID})
}
bucket = fs.denormalizeBucket(bucket)
bucketPath := filepath.Join(fs.path, bucket)
if _, e := os.Stat(bucketPath); e != nil {
// Check bucket exists.
if os.IsNotExist(e) {
return ObjectMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
return ObjectMetadata{}, probe.NewError(InternalError{})
}
objectPath := filepath.Join(bucketPath, object)
file, e := atomic.FileCreateWithPrefix(objectPath, "$tmpobject")
if e != nil {
return ObjectMetadata{}, probe.NewError(e)
}
md5Hasher := md5.New()
objectWriter := io.MultiWriter(file, md5Hasher)
partBytes, e := ioutil.ReadAll(data)
if e != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(e)
}
if signature != nil {
sh := sha256.New()
sh.Write(partBytes)
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(sh.Sum(nil)))
if err != nil {
file.CloseAndPurge()
return ObjectMetadata{}, err.Trace()
}
if !ok {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(signV4.SigDoesNotMatch{})
}
}
completeMultipartUpload := &CompleteMultipartUpload{}
if e := xml.Unmarshal(partBytes, completeMultipartUpload); e != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(MalformedXML{})
}
if !sort.IsSorted(completedParts(completeMultipartUpload.Part)) {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(InvalidPartOrder{})
}
// Save parts for verification.
parts := completeMultipartUpload.Part
// Critical region requiring read lock.
fs.rwLock.RLock()
savedParts := fs.multiparts.ActiveSession[uploadID].Parts
fs.rwLock.RUnlock()
if !doPartsMatch(parts, savedParts) {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(InvalidPart{})
}
// Parts successfully validated, save all the parts.
partPathPrefix := objectPath + uploadID
if err := saveParts(partPathPrefix, objectWriter, parts); err != nil {
file.CloseAndPurge()
return ObjectMetadata{}, err.Trace(partPathPrefix)
}
// Successfully saved, remove all parts.
removeParts(partPathPrefix, savedParts)
// Critical region requiring write lock.
fs.rwLock.Lock()
delete(fs.multiparts.ActiveSession, uploadID)
if err := saveMultipartsSession(*fs.multiparts); err != nil {
fs.rwLock.Unlock()
file.CloseAndPurge()
return ObjectMetadata{}, err.Trace(partPathPrefix)
}
file.Close()
fs.rwLock.Unlock()
// Send stat again to get object metadata.
st, e := os.Stat(objectPath)
if e != nil {
return ObjectMetadata{}, probe.NewError(e)
}
contentType := "application/octet-stream"
if objectExt := filepath.Ext(objectPath); objectExt != "" {
content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
if ok {
contentType = content.ContentType
}
}
newObject := ObjectMetadata{
Bucket: bucket,
Object: object,
Created: st.ModTime(),
Size: st.Size(),
ContentType: contentType,
MD5: hex.EncodeToString(md5Hasher.Sum(nil)),
}
return newObject, nil
}
// CreateObject - create an object.
func (fs Filesystem) CreateObject(bucket, object, expectedMD5Sum string, size int64, data io.Reader, signature *signV4.Signature) (ObjectMetadata, *probe.Error) {
di, e := disk.GetInfo(fs.path)
if e != nil {
return ObjectMetadata{}, probe.NewError(e)
}
// Remove 5% from total space for cumulative disk space used for
// journalling, inodes etc.
availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
if int64(availableDiskSpace) <= fs.minFreeDisk {
return ObjectMetadata{}, probe.NewError(RootPathFull{Path: fs.path})
}
// Check bucket name valid.
if !IsValidBucketName(bucket) {
return ObjectMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
bucket = fs.denormalizeBucket(bucket)
bucketPath := filepath.Join(fs.path, bucket)
if _, e = os.Stat(bucketPath); e != nil {
if os.IsNotExist(e) {
return ObjectMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
return ObjectMetadata{}, probe.NewError(e)
}
// Verify object path legal.
if !IsValidObjectName(object) {
return ObjectMetadata{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// Get object path.
objectPath := filepath.Join(bucketPath, object)
if strings.TrimSpace(expectedMD5Sum) != "" {
var expectedMD5SumBytes []byte
expectedMD5SumBytes, e = base64.StdEncoding.DecodeString(strings.TrimSpace(expectedMD5Sum))
if e != nil {
// Pro-actively close the connection.
return ObjectMetadata{}, probe.NewError(InvalidDigest{MD5: expectedMD5Sum})
}
expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
}
// Write object.
file, e := atomic.FileCreateWithPrefix(objectPath, "$tmpobject")
if e != nil {
switch e := e.(type) {
case *os.PathError:
if e.Op == "mkdir" {
if strings.Contains(e.Error(), "not a directory") {
return ObjectMetadata{}, probe.NewError(ObjectExistsAsPrefix{Bucket: bucket, Prefix: object})
}
}
return ObjectMetadata{}, probe.NewError(e)
default:
return ObjectMetadata{}, probe.NewError(e)
}
}
// Instantiate checksum hashers and create a multiwriter.
md5Hasher := md5.New()
sha256Hasher := sha256.New()
objectWriter := io.MultiWriter(file, md5Hasher, sha256Hasher)
if size > 0 {
if _, e = io.CopyN(objectWriter, data, size); e != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(e)
}
} else {
if _, e = io.Copy(objectWriter, data); e != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(e)
}
}
md5Sum := hex.EncodeToString(md5Hasher.Sum(nil))
// Verify if the written object is equal to what is expected, only
// if it is requested as such.
if strings.TrimSpace(expectedMD5Sum) != "" {
if !isMD5SumEqual(strings.TrimSpace(expectedMD5Sum), md5Sum) {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(BadDigest{MD5: expectedMD5Sum, Bucket: bucket, Object: object})
}
}
sha256Sum := hex.EncodeToString(sha256Hasher.Sum(nil))
if signature != nil {
ok, err := signature.DoesSignatureMatch(sha256Sum)
if err != nil {
file.CloseAndPurge()
return ObjectMetadata{}, err.Trace()
}
if !ok {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(signV4.SigDoesNotMatch{})
}
}
file.Close()
// Set stat again to get the latest metadata.
st, e := os.Stat(objectPath)
if e != nil {
return ObjectMetadata{}, probe.NewError(e)
}
contentType := "application/octet-stream"
if objectExt := filepath.Ext(objectPath); objectExt != "" {
content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
if ok {
contentType = content.ContentType
}
}
newObject := ObjectMetadata{
Bucket: bucket,
Object: object,
Created: st.ModTime(),
Size: st.Size(),
ContentType: contentType,
MD5: md5Sum,
}
return newObject, nil
}
// CreateObjectPart - create a part in a multipart session
func (fs Filesystem) CreateObjectPart(bucket, object, uploadID, expectedMD5Sum string, partID int, size int64, data io.Reader, signature *signV4.Signature) (string, *probe.Error) {
di, err := disk.GetInfo(fs.path)
if err != nil {
return "", probe.NewError(err)
}
// Remove 5% from total space for cumulative disk space used for
// journalling, inodes etc.
availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
if int64(availableDiskSpace) <= fs.minFreeDisk {
return "", probe.NewError(RootPathFull{Path: fs.path})
}
// Part id cannot be negative.
if partID <= 0 {
return "", probe.NewError(errors.New("invalid part id, cannot be zero or less than zero"))
}
// Check bucket name valid.
if !IsValidBucketName(bucket) {
return "", probe.NewError(BucketNameInvalid{Bucket: bucket})
}
// Verify object path legal.
if !IsValidObjectName(object) {
return "", probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// Verify upload is valid for the incoming object.
if !fs.isValidUploadID(object, uploadID) {
return "", probe.NewError(InvalidUploadID{UploadID: uploadID})
}
if strings.TrimSpace(expectedMD5Sum) != "" {
var expectedMD5SumBytes []byte
expectedMD5SumBytes, err = base64.StdEncoding.DecodeString(strings.TrimSpace(expectedMD5Sum))
if err != nil {
// Pro-actively close the connection
return "", probe.NewError(InvalidDigest{MD5: expectedMD5Sum})
}
expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
}
bucket = fs.denormalizeBucket(bucket)
bucketPath := filepath.Join(fs.path, bucket)
if _, err = os.Stat(bucketPath); err != nil {
// Check bucket exists.
if os.IsNotExist(err) {
return "", probe.NewError(BucketNotFound{Bucket: bucket})
}
return "", probe.NewError(err)
}
objectPath := filepath.Join(bucketPath, object)
partPathPrefix := objectPath + uploadID
partPath := partPathPrefix + expectedMD5Sum + fmt.Sprintf("$%d-$multiparts", partID)
partFile, e := atomic.FileCreateWithPrefix(partPath, "$multiparts")
if e != nil {
return "", probe.NewError(e)
}
md5Hasher := md5.New()
sha256Hasher := sha256.New()
partWriter := io.MultiWriter(partFile, md5Hasher, sha256Hasher)
if _, e = io.CopyN(partWriter, data, size); e != nil {
partFile.CloseAndPurge()
return "", probe.NewError(e)
}
md5sum := hex.EncodeToString(md5Hasher.Sum(nil))
// Verify if the written object is equal to what is expected, only
// if it is requested as such.
if strings.TrimSpace(expectedMD5Sum) != "" {
if !isMD5SumEqual(strings.TrimSpace(expectedMD5Sum), md5sum) {
partFile.CloseAndPurge()
return "", probe.NewError(BadDigest{MD5: expectedMD5Sum, Bucket: bucket, Object: object})
}
}
if signature != nil {
ok, err := signature.DoesSignatureMatch(hex.EncodeToString(sha256Hasher.Sum(nil)))
if err != nil {
partFile.CloseAndPurge()
return "", err.Trace()
}
if !ok {
partFile.CloseAndPurge()
return "", probe.NewError(signV4.SigDoesNotMatch{})
}
}
partFile.Close()
fi, e := os.Stat(partPath)
if e != nil {
return "", probe.NewError(e)
}
partMetadata := PartMetadata{}
partMetadata.ETag = md5sum
partMetadata.PartNumber = partID
partMetadata.Size = fi.Size()
partMetadata.LastModified = fi.ModTime()
// Critical region requiring read lock.
fs.rwLock.RLock()
deserializedMultipartSession, ok := fs.multiparts.ActiveSession[uploadID]
fs.rwLock.RUnlock()
if !ok {
return "", probe.NewError(InvalidUploadID{UploadID: uploadID})
}
// Add all incoming parts.
deserializedMultipartSession.Parts = append(deserializedMultipartSession.Parts, partMetadata)
// Remove duplicate parts based on the most recent uploaded.
deserializedMultipartSession.Parts = removeDuplicateParts(deserializedMultipartSession.Parts)
// Save total parts uploaded.
deserializedMultipartSession.TotalParts = len(deserializedMultipartSession.Parts)
// Sort by part number before saving.
sort.Sort(partNumber(deserializedMultipartSession.Parts))
// Critical region requiring write lock.
fs.rwLock.Lock()
fs.multiparts.ActiveSession[uploadID] = deserializedMultipartSession
if err := saveMultipartsSession(*fs.multiparts); err != nil {
fs.rwLock.Unlock()
return "", err.Trace(partPathPrefix)
}
fs.rwLock.Unlock()
// Return etag.
return partMetadata.ETag, nil
}