mirror of
https://github.com/drakkan/sftpgo.git
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666 lines
19 KiB
Go
666 lines
19 KiB
Go
// +build !nos3
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package vfs
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import (
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"context"
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"fmt"
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"mime"
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"net/url"
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"os"
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"path"
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"path/filepath"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/s3"
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"github.com/aws/aws-sdk-go/service/s3/s3manager"
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"github.com/eikenb/pipeat"
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"github.com/drakkan/sftpgo/logger"
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"github.com/drakkan/sftpgo/metrics"
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"github.com/drakkan/sftpgo/utils"
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"github.com/drakkan/sftpgo/version"
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)
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// S3Fs is a Fs implementation for AWS S3 compatible object storages
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type S3Fs struct {
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connectionID string
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localTempDir string
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config *S3FsConfig
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svc *s3.S3
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ctxTimeout time.Duration
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ctxLongTimeout time.Duration
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}
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func init() {
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version.AddFeature("+s3")
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}
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// NewS3Fs returns an S3Fs object that allows to interact with an s3 compatible
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// object storage
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func NewS3Fs(connectionID, localTempDir string, config S3FsConfig) (Fs, error) {
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fs := &S3Fs{
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connectionID: connectionID,
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localTempDir: localTempDir,
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config: &config,
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ctxTimeout: 30 * time.Second,
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ctxLongTimeout: 300 * time.Second,
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}
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if err := fs.config.Validate(); err != nil {
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return fs, err
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}
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awsConfig := aws.NewConfig()
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if fs.config.Region != "" {
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awsConfig.WithRegion(fs.config.Region)
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}
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if !fs.config.AccessSecret.IsEmpty() {
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if fs.config.AccessSecret.IsEncrypted() {
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err := fs.config.AccessSecret.Decrypt()
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if err != nil {
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return fs, err
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}
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}
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awsConfig.Credentials = credentials.NewStaticCredentials(fs.config.AccessKey, fs.config.AccessSecret.GetPayload(), "")
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}
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if fs.config.Endpoint != "" {
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awsConfig.Endpoint = aws.String(fs.config.Endpoint)
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awsConfig.S3ForcePathStyle = aws.Bool(true)
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}
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if fs.config.UploadPartSize == 0 {
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fs.config.UploadPartSize = s3manager.DefaultUploadPartSize
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} else {
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fs.config.UploadPartSize *= 1024 * 1024
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}
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if fs.config.UploadConcurrency == 0 {
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fs.config.UploadConcurrency = 2
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}
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sessOpts := session.Options{
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Config: *awsConfig,
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SharedConfigState: session.SharedConfigEnable,
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}
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sess, err := session.NewSessionWithOptions(sessOpts)
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if err != nil {
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return fs, err
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}
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fs.svc = s3.New(sess)
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return fs, nil
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}
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// Name returns the name for the Fs implementation
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func (fs *S3Fs) Name() string {
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return fmt.Sprintf("S3Fs bucket %#v", fs.config.Bucket)
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}
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// ConnectionID returns the connection ID associated to this Fs implementation
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func (fs *S3Fs) ConnectionID() string {
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return fs.connectionID
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}
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// Stat returns a FileInfo describing the named file
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func (fs *S3Fs) Stat(name string) (os.FileInfo, error) {
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var result *FileInfo
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if name == "/" || name == "." {
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err := fs.checkIfBucketExists()
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if err != nil {
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return result, err
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}
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return NewFileInfo(name, true, 0, time.Now(), false), nil
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}
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if "/"+fs.config.KeyPrefix == name+"/" {
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return NewFileInfo(name, true, 0, time.Now(), false), nil
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}
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obj, err := fs.headObject(name)
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if err == nil {
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// a "dir" has a trailing "/" so we cannot have a directory here
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objSize := *obj.ContentLength
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objectModTime := *obj.LastModified
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return NewFileInfo(name, false, objSize, objectModTime, false), nil
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}
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if !fs.IsNotExist(err) {
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return result, err
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}
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// now check if this is a prefix (virtual directory)
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hasContents, err := fs.hasContents(name)
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if err == nil && hasContents {
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return NewFileInfo(name, true, 0, time.Now(), false), nil
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} else if err != nil {
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return nil, err
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}
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// the requested file may still be a directory as a zero bytes key
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// with a trailing forward slash (created using mkdir).
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// S3 doesn't return content type when listing objects, so we have
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// create "dirs" adding a trailing "/" to the key
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return fs.getStatForDir(name)
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}
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func (fs *S3Fs) getStatForDir(name string) (os.FileInfo, error) {
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var result *FileInfo
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obj, err := fs.headObject(name + "/")
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if err != nil {
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return result, err
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}
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objSize := *obj.ContentLength
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objectModTime := *obj.LastModified
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return NewFileInfo(name, true, objSize, objectModTime, false), nil
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}
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// Lstat returns a FileInfo describing the named file
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func (fs *S3Fs) Lstat(name string) (os.FileInfo, error) {
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return fs.Stat(name)
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}
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// Open opens the named file for reading
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func (fs *S3Fs) Open(name string, offset int64) (File, *pipeat.PipeReaderAt, func(), error) {
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r, w, err := pipeat.PipeInDir(fs.localTempDir)
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if err != nil {
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return nil, nil, nil, err
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}
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ctx, cancelFn := context.WithCancel(context.Background())
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downloader := s3manager.NewDownloaderWithClient(fs.svc)
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var streamRange *string
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if offset > 0 {
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streamRange = aws.String(fmt.Sprintf("bytes=%v-", offset))
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}
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go func() {
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defer cancelFn()
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n, err := downloader.DownloadWithContext(ctx, w, &s3.GetObjectInput{
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Bucket: aws.String(fs.config.Bucket),
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Key: aws.String(name),
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Range: streamRange,
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})
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w.CloseWithError(err) //nolint:errcheck
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fsLog(fs, logger.LevelDebug, "download completed, path: %#v size: %v, err: %v", name, n, err)
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metrics.S3TransferCompleted(n, 1, err)
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}()
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return nil, r, cancelFn, nil
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}
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// Create creates or opens the named file for writing
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func (fs *S3Fs) Create(name string, flag int) (File, *PipeWriter, func(), error) {
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r, w, err := pipeat.PipeInDir(fs.localTempDir)
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if err != nil {
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return nil, nil, nil, err
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}
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p := NewPipeWriter(w)
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ctx, cancelFn := context.WithCancel(context.Background())
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uploader := s3manager.NewUploaderWithClient(fs.svc)
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go func() {
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defer cancelFn()
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key := name
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var contentType string
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if flag == -1 {
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contentType = dirMimeType
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} else {
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contentType = mime.TypeByExtension(path.Ext(name))
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}
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response, err := uploader.UploadWithContext(ctx, &s3manager.UploadInput{
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Bucket: aws.String(fs.config.Bucket),
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Key: aws.String(key),
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Body: r,
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StorageClass: utils.NilIfEmpty(fs.config.StorageClass),
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ContentType: utils.NilIfEmpty(contentType),
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}, func(u *s3manager.Uploader) {
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u.Concurrency = fs.config.UploadConcurrency
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u.PartSize = fs.config.UploadPartSize
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})
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r.CloseWithError(err) //nolint:errcheck
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p.Done(err)
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fsLog(fs, logger.LevelDebug, "upload completed, path: %#v, response: %v, readed bytes: %v, err: %+v",
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name, response, r.GetReadedBytes(), err)
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metrics.S3TransferCompleted(r.GetReadedBytes(), 0, err)
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}()
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return nil, p, cancelFn, nil
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}
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// Rename renames (moves) source to target.
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// We don't support renaming non empty directories since we should
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// rename all the contents too and this could take long time: think
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// about directories with thousands of files, for each file we should
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// execute a CopyObject call.
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// TODO: rename does not work for files bigger than 5GB, implement
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// multipart copy or wait for this pull request to be merged:
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//
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// https://github.com/aws/aws-sdk-go/pull/2653
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//
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func (fs *S3Fs) Rename(source, target string) error {
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if source == target {
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return nil
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}
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fi, err := fs.Stat(source)
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if err != nil {
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return err
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}
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copySource := fs.Join(fs.config.Bucket, source)
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if fi.IsDir() {
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hasContents, err := fs.hasContents(source)
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if err != nil {
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return err
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}
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if hasContents {
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return fmt.Errorf("Cannot rename non empty directory: %#v", source)
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}
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if !strings.HasSuffix(copySource, "/") {
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copySource += "/"
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}
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if !strings.HasSuffix(target, "/") {
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target += "/"
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}
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}
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var contentType string
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if fi.IsDir() {
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contentType = dirMimeType
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} else {
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contentType = mime.TypeByExtension(path.Ext(source))
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}
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ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
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defer cancelFn()
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_, err = fs.svc.CopyObjectWithContext(ctx, &s3.CopyObjectInput{
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Bucket: aws.String(fs.config.Bucket),
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CopySource: aws.String(url.PathEscape(copySource)),
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Key: aws.String(target),
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StorageClass: utils.NilIfEmpty(fs.config.StorageClass),
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ContentType: utils.NilIfEmpty(contentType),
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})
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metrics.S3CopyObjectCompleted(err)
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if err != nil {
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return err
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}
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return fs.Remove(source, fi.IsDir())
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}
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// Remove removes the named file or (empty) directory.
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func (fs *S3Fs) Remove(name string, isDir bool) error {
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if isDir {
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hasContents, err := fs.hasContents(name)
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if err != nil {
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return err
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}
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if hasContents {
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return fmt.Errorf("Cannot remove non empty directory: %#v", name)
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}
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if !strings.HasSuffix(name, "/") {
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name += "/"
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}
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}
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ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
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defer cancelFn()
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_, err := fs.svc.DeleteObjectWithContext(ctx, &s3.DeleteObjectInput{
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Bucket: aws.String(fs.config.Bucket),
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Key: aws.String(name),
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})
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metrics.S3DeleteObjectCompleted(err)
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return err
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}
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// Mkdir creates a new directory with the specified name and default permissions
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func (fs *S3Fs) Mkdir(name string) error {
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_, err := fs.Stat(name)
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if !fs.IsNotExist(err) {
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return err
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}
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if !strings.HasSuffix(name, "/") {
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name += "/"
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}
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_, w, _, err := fs.Create(name, -1)
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if err != nil {
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return err
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}
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return w.Close()
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}
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// Symlink creates source as a symbolic link to target.
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func (*S3Fs) Symlink(source, target string) error {
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return ErrVfsUnsupported
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}
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// Readlink returns the destination of the named symbolic link
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func (*S3Fs) Readlink(name string) (string, error) {
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return "", ErrVfsUnsupported
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}
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// Chown changes the numeric uid and gid of the named file.
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func (*S3Fs) Chown(name string, uid int, gid int) error {
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return ErrVfsUnsupported
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}
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// Chmod changes the mode of the named file to mode.
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func (*S3Fs) Chmod(name string, mode os.FileMode) error {
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return ErrVfsUnsupported
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}
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// Chtimes changes the access and modification times of the named file.
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func (*S3Fs) Chtimes(name string, atime, mtime time.Time) error {
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return ErrVfsUnsupported
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}
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// Truncate changes the size of the named file.
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// Truncate by path is not supported, while truncating an opened
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// file is handled inside base transfer
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func (*S3Fs) Truncate(name string, size int64) error {
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return ErrVfsUnsupported
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}
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// ReadDir reads the directory named by dirname and returns
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// a list of directory entries.
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func (fs *S3Fs) ReadDir(dirname string) ([]os.FileInfo, error) {
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var result []os.FileInfo
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// dirname must be already cleaned
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prefix := ""
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if dirname != "/" && dirname != "." {
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prefix = strings.TrimPrefix(dirname, "/")
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if !strings.HasSuffix(prefix, "/") {
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prefix += "/"
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}
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}
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prefixes := make(map[string]bool)
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ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
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defer cancelFn()
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err := fs.svc.ListObjectsV2PagesWithContext(ctx, &s3.ListObjectsV2Input{
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Bucket: aws.String(fs.config.Bucket),
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Prefix: aws.String(prefix),
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Delimiter: aws.String("/"),
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}, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
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for _, p := range page.CommonPrefixes {
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// prefixes have a trailing slash
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name, _ := fs.resolve(p.Prefix, prefix)
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if name == "" {
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continue
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}
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if _, ok := prefixes[name]; ok {
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continue
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}
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result = append(result, NewFileInfo(name, true, 0, time.Now(), false))
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prefixes[name] = true
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}
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for _, fileObject := range page.Contents {
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objectSize := *fileObject.Size
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objectModTime := *fileObject.LastModified
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name, isDir := fs.resolve(fileObject.Key, prefix)
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if name == "" {
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continue
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}
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if isDir {
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if _, ok := prefixes[name]; ok {
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continue
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}
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prefixes[name] = true
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}
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result = append(result, NewFileInfo(name, (isDir && objectSize == 0), objectSize, objectModTime, false))
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}
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return true
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})
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metrics.S3ListObjectsCompleted(err)
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return result, err
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}
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// IsUploadResumeSupported returns true if upload resume is supported.
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// SFTP Resume is not supported on S3
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func (*S3Fs) IsUploadResumeSupported() bool {
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return false
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}
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// IsAtomicUploadSupported returns true if atomic upload is supported.
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// S3 uploads are already atomic, we don't need to upload to a temporary
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// file
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func (*S3Fs) IsAtomicUploadSupported() bool {
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return false
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}
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// IsNotExist returns a boolean indicating whether the error is known to
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// report that a file or directory does not exist
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func (*S3Fs) IsNotExist(err error) bool {
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if err == nil {
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return false
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}
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if aerr, ok := err.(awserr.Error); ok {
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if aerr.Code() == s3.ErrCodeNoSuchKey {
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return true
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}
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if aerr.Code() == s3.ErrCodeNoSuchBucket {
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return true
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}
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}
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if multierr, ok := err.(s3manager.MultiUploadFailure); ok {
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if multierr.Code() == s3.ErrCodeNoSuchKey {
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return true
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}
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if multierr.Code() == s3.ErrCodeNoSuchBucket {
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return true
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}
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}
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return strings.Contains(err.Error(), "404")
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}
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// IsPermission returns a boolean indicating whether the error is known to
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// report that permission is denied.
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func (*S3Fs) IsPermission(err error) bool {
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if err == nil {
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return false
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}
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return strings.Contains(err.Error(), "403")
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}
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// IsNotSupported returns true if the error indicate an unsupported operation
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func (*S3Fs) IsNotSupported(err error) bool {
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if err == nil {
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return false
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}
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return err == ErrVfsUnsupported
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}
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// CheckRootPath creates the specified local root directory if it does not exists
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func (fs *S3Fs) CheckRootPath(username string, uid int, gid int) bool {
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// we need a local directory for temporary files
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osFs := NewOsFs(fs.ConnectionID(), fs.localTempDir, nil)
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return osFs.CheckRootPath(username, uid, gid)
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}
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// ScanRootDirContents returns the number of files contained in the bucket,
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// and their size
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func (fs *S3Fs) ScanRootDirContents() (int, int64, error) {
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numFiles := 0
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size := int64(0)
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ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxLongTimeout))
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defer cancelFn()
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err := fs.svc.ListObjectsV2PagesWithContext(ctx, &s3.ListObjectsV2Input{
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Bucket: aws.String(fs.config.Bucket),
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Prefix: aws.String(fs.config.KeyPrefix),
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}, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
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for _, fileObject := range page.Contents {
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isDir := strings.HasSuffix(*fileObject.Key, "/")
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if isDir && *fileObject.Size == 0 {
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continue
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}
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numFiles++
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size += *fileObject.Size
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}
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return true
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})
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metrics.S3ListObjectsCompleted(err)
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return numFiles, size, err
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}
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// GetDirSize returns the number of files and the size for a folder
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// including any subfolders
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func (*S3Fs) GetDirSize(dirname string) (int, int64, error) {
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return 0, 0, ErrVfsUnsupported
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}
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// GetAtomicUploadPath returns the path to use for an atomic upload.
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// S3 uploads are already atomic, we never call this method for S3
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func (*S3Fs) GetAtomicUploadPath(name string) string {
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return ""
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}
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// GetRelativePath returns the path for a file relative to the user's home dir.
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// This is the path as seen by SFTPGo users
|
|
func (fs *S3Fs) GetRelativePath(name string) string {
|
|
rel := path.Clean(name)
|
|
if rel == "." {
|
|
rel = ""
|
|
}
|
|
if !path.IsAbs(rel) {
|
|
return "/" + rel
|
|
}
|
|
if fs.config.KeyPrefix != "" {
|
|
if !strings.HasPrefix(rel, "/"+fs.config.KeyPrefix) {
|
|
rel = "/"
|
|
}
|
|
rel = path.Clean("/" + strings.TrimPrefix(rel, "/"+fs.config.KeyPrefix))
|
|
}
|
|
return rel
|
|
}
|
|
|
|
// Walk walks the file tree rooted at root, calling walkFn for each file or
|
|
// directory in the tree, including root. The result are unordered
|
|
func (fs *S3Fs) Walk(root string, walkFn filepath.WalkFunc) error {
|
|
prefix := ""
|
|
if root != "/" && root != "." {
|
|
prefix = strings.TrimPrefix(root, "/")
|
|
if !strings.HasSuffix(prefix, "/") {
|
|
prefix += "/"
|
|
}
|
|
}
|
|
ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
|
|
defer cancelFn()
|
|
err := fs.svc.ListObjectsV2PagesWithContext(ctx, &s3.ListObjectsV2Input{
|
|
Bucket: aws.String(fs.config.Bucket),
|
|
Prefix: aws.String(prefix),
|
|
}, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
|
|
for _, fileObject := range page.Contents {
|
|
objectSize := *fileObject.Size
|
|
objectModTime := *fileObject.LastModified
|
|
isDir := strings.HasSuffix(*fileObject.Key, "/")
|
|
name := path.Clean(*fileObject.Key)
|
|
if name == "/" || name == "." {
|
|
continue
|
|
}
|
|
err := walkFn(fs.Join("/", *fileObject.Key), NewFileInfo(name, isDir, objectSize, objectModTime, false), nil)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
})
|
|
metrics.S3ListObjectsCompleted(err)
|
|
walkFn(root, NewFileInfo(root, true, 0, time.Now(), false), err) //nolint:errcheck
|
|
|
|
return err
|
|
}
|
|
|
|
// Join joins any number of path elements into a single path
|
|
func (*S3Fs) Join(elem ...string) string {
|
|
return path.Join(elem...)
|
|
}
|
|
|
|
// HasVirtualFolders returns true if folders are emulated
|
|
func (*S3Fs) HasVirtualFolders() bool {
|
|
return true
|
|
}
|
|
|
|
// ResolvePath returns the matching filesystem path for the specified virtual path
|
|
func (fs *S3Fs) ResolvePath(virtualPath string) (string, error) {
|
|
if !path.IsAbs(virtualPath) {
|
|
virtualPath = path.Clean("/" + virtualPath)
|
|
}
|
|
return fs.Join("/", fs.config.KeyPrefix, virtualPath), nil
|
|
}
|
|
|
|
func (fs *S3Fs) resolve(name *string, prefix string) (string, bool) {
|
|
result := strings.TrimPrefix(*name, prefix)
|
|
isDir := strings.HasSuffix(result, "/")
|
|
if isDir {
|
|
result = strings.TrimSuffix(result, "/")
|
|
}
|
|
if strings.Contains(result, "/") {
|
|
i := strings.Index(result, "/")
|
|
isDir = true
|
|
result = result[:i]
|
|
}
|
|
return result, isDir
|
|
}
|
|
|
|
func (fs *S3Fs) checkIfBucketExists() error {
|
|
ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
|
|
defer cancelFn()
|
|
_, err := fs.svc.HeadBucketWithContext(ctx, &s3.HeadBucketInput{
|
|
Bucket: aws.String(fs.config.Bucket),
|
|
})
|
|
metrics.S3HeadBucketCompleted(err)
|
|
return err
|
|
}
|
|
|
|
func (fs *S3Fs) hasContents(name string) (bool, error) {
|
|
prefix := ""
|
|
if name != "/" && name != "." {
|
|
prefix = strings.TrimPrefix(name, "/")
|
|
if !strings.HasSuffix(prefix, "/") {
|
|
prefix += "/"
|
|
}
|
|
}
|
|
maxResults := int64(2)
|
|
ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
|
|
defer cancelFn()
|
|
results, err := fs.svc.ListObjectsV2WithContext(ctx, &s3.ListObjectsV2Input{
|
|
Bucket: aws.String(fs.config.Bucket),
|
|
Prefix: aws.String(prefix),
|
|
MaxKeys: &maxResults,
|
|
})
|
|
metrics.S3ListObjectsCompleted(err)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
// MinIO returns no contents while S3 returns 1 object
|
|
// with the key equal to the prefix for empty directories
|
|
for _, obj := range results.Contents {
|
|
name, _ := fs.resolve(obj.Key, prefix)
|
|
if name == "" || name == "/" {
|
|
continue
|
|
}
|
|
return true, nil
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
func (fs *S3Fs) headObject(name string) (*s3.HeadObjectOutput, error) {
|
|
ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(fs.ctxTimeout))
|
|
defer cancelFn()
|
|
obj, err := fs.svc.HeadObjectWithContext(ctx, &s3.HeadObjectInput{
|
|
Bucket: aws.String(fs.config.Bucket),
|
|
Key: aws.String(name),
|
|
})
|
|
metrics.S3HeadObjectCompleted(err)
|
|
return obj, err
|
|
}
|
|
|
|
// GetMimeType returns the content type
|
|
func (fs *S3Fs) GetMimeType(name string) (string, error) {
|
|
obj, err := fs.headObject(name)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return *obj.ContentType, err
|
|
}
|
|
|
|
// Close closes the fs
|
|
func (*S3Fs) Close() error {
|
|
return nil
|
|
}
|
|
|
|
// GetAvailableDiskSize return the available size for the specified path
|
|
func (*S3Fs) GetAvailableDiskSize(dirName string) (int64, error) {
|
|
return 0, errStorageSizeUnavailable
|
|
}
|