Update dependencies (#1610)

* Update dependencies

* Update module to go 1.17

4 files changed, 792 insertions, 0 deletions

diff --git a/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/filesstore.go b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/filesstore.go
new file mode 100644
index 00000000..ef02895d
--- /dev/null
+++ b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/filesstore.go
@@ -0,0 +1,83 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package filestore
+
+import (
+	"io"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	driverS3    = "amazons3"
+	driverLocal = "local"
+)
+
+type ReadCloseSeeker interface {
+	io.ReadCloser
+	io.Seeker
+}
+
+type FileBackend interface {
+	TestConnection() error
+
+	Reader(path string) (ReadCloseSeeker, error)
+	ReadFile(path string) ([]byte, error)
+	FileExists(path string) (bool, error)
+	FileSize(path string) (int64, error)
+	CopyFile(oldPath, newPath string) error
+	MoveFile(oldPath, newPath string) error
+	WriteFile(fr io.Reader, path string) (int64, error)
+	AppendFile(fr io.Reader, path string) (int64, error)
+	RemoveFile(path string) error
+	FileModTime(path string) (time.Time, error)
+
+	ListDirectory(path string) ([]string, error)
+	RemoveDirectory(path string) error
+}
+
+type FileBackendSettings struct {
+	DriverName              string
+	Directory               string
+	AmazonS3AccessKeyId     string
+	AmazonS3SecretAccessKey string
+	AmazonS3Bucket          string
+	AmazonS3PathPrefix      string
+	AmazonS3Region          string
+	AmazonS3Endpoint        string
+	AmazonS3SSL             bool
+	AmazonS3SignV2          bool
+	AmazonS3SSE             bool
+	AmazonS3Trace           bool
+}
+
+func (settings *FileBackendSettings) CheckMandatoryS3Fields() error {
+	if settings.AmazonS3Bucket == "" {
+		return errors.New("missing s3 bucket settings")
+	}
+
+	// if S3 endpoint is not set call the set defaults to set that
+	if settings.AmazonS3Endpoint == "" {
+		settings.AmazonS3Endpoint = "s3.amazonaws.com"
+	}
+
+	return nil
+}
+
+func NewFileBackend(settings FileBackendSettings) (FileBackend, error) {
+	switch settings.DriverName {
+	case driverS3:
+		backend, err := NewS3FileBackend(settings)
+		if err != nil {
+			return nil, errors.Wrap(err, "unable to connect to the s3 backend")
+		}
+		return backend, nil
+	case driverLocal:
+		return &LocalFileBackend{
+			directory: settings.Directory,
+		}, nil
+	}
+	return nil, errors.New("no valid filestorage driver found")
+}
diff --git a/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/localstore.go b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/localstore.go
new file mode 100644
index 00000000..6cd8c4ca
--- /dev/null
+++ b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/localstore.go
@@ -0,0 +1,211 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package filestore
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/pkg/errors"
+
+	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+)
+
+const (
+	TestFilePath = "/testfile"
+)
+
+type LocalFileBackend struct {
+	directory string
+}
+
+// copyFile will copy a file from src path to dst path.
+// Overwrites any existing files at dst.
+// Permissions are copied from file at src to the new file at dst.
+func copyFile(src, dst string) (err error) {
+	in, err := os.Open(src)
+	if err != nil {
+		return
+	}
+	defer in.Close()
+
+	if err = os.MkdirAll(filepath.Dir(dst), os.ModePerm); err != nil {
+		return
+	}
+	out, err := os.Create(dst)
+	if err != nil {
+		return
+	}
+	defer func() {
+		if e := out.Close(); e != nil {
+			err = e
+		}
+	}()
+
+	_, err = io.Copy(out, in)
+	if err != nil {
+		return
+	}
+
+	err = out.Sync()
+	if err != nil {
+		return
+	}
+
+	stat, err := os.Stat(src)
+	if err != nil {
+		return
+	}
+	err = os.Chmod(dst, stat.Mode())
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+func (b *LocalFileBackend) TestConnection() error {
+	f := bytes.NewReader([]byte("testingwrite"))
+	if _, err := writeFileLocally(f, filepath.Join(b.directory, TestFilePath)); err != nil {
+		return errors.Wrap(err, "unable to write to the local filesystem storage")
+	}
+	os.Remove(filepath.Join(b.directory, TestFilePath))
+	mlog.Debug("Able to write files to local storage.")
+	return nil
+}
+
+func (b *LocalFileBackend) Reader(path string) (ReadCloseSeeker, error) {
+	f, err := os.Open(filepath.Join(b.directory, path))
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to open file %s", path)
+	}
+	return f, nil
+}
+
+func (b *LocalFileBackend) ReadFile(path string) ([]byte, error) {
+	f, err := ioutil.ReadFile(filepath.Join(b.directory, path))
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to read file %s", path)
+	}
+	return f, nil
+}
+
+func (b *LocalFileBackend) FileExists(path string) (bool, error) {
+	_, err := os.Stat(filepath.Join(b.directory, path))
+
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+
+	if err != nil {
+		return false, errors.Wrapf(err, "unable to know if file %s exists", path)
+	}
+	return true, nil
+}
+
+func (b *LocalFileBackend) FileSize(path string) (int64, error) {
+	info, err := os.Stat(filepath.Join(b.directory, path))
+	if err != nil {
+		return 0, errors.Wrapf(err, "unable to get file size for %s", path)
+	}
+	return info.Size(), nil
+}
+
+func (b *LocalFileBackend) FileModTime(path string) (time.Time, error) {
+	info, err := os.Stat(filepath.Join(b.directory, path))
+	if err != nil {
+		return time.Time{}, errors.Wrapf(err, "unable to get modification time for file %s", path)
+	}
+	return info.ModTime(), nil
+}
+
+func (b *LocalFileBackend) CopyFile(oldPath, newPath string) error {
+	if err := copyFile(filepath.Join(b.directory, oldPath), filepath.Join(b.directory, newPath)); err != nil {
+		return errors.Wrapf(err, "unable to copy file from %s to %s", oldPath, newPath)
+	}
+	return nil
+}
+
+func (b *LocalFileBackend) MoveFile(oldPath, newPath string) error {
+	if err := os.MkdirAll(filepath.Dir(filepath.Join(b.directory, newPath)), 0750); err != nil {
+		return errors.Wrapf(err, "unable to create the new destination directory %s", filepath.Dir(newPath))
+	}
+
+	if err := os.Rename(filepath.Join(b.directory, oldPath), filepath.Join(b.directory, newPath)); err != nil {
+		return errors.Wrapf(err, "unable to move the file to %s to the destination directory", newPath)
+	}
+
+	return nil
+}
+
+func (b *LocalFileBackend) WriteFile(fr io.Reader, path string) (int64, error) {
+	return writeFileLocally(fr, filepath.Join(b.directory, path))
+}
+
+func writeFileLocally(fr io.Reader, path string) (int64, error) {
+	if err := os.MkdirAll(filepath.Dir(path), 0750); err != nil {
+		directory, _ := filepath.Abs(filepath.Dir(path))
+		return 0, errors.Wrapf(err, "unable to create the directory %s for the file %s", directory, path)
+	}
+	fw, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return 0, errors.Wrapf(err, "unable to open the file %s to write the data", path)
+	}
+	defer fw.Close()
+	written, err := io.Copy(fw, fr)
+	if err != nil {
+		return written, errors.Wrapf(err, "unable write the data in the file %s", path)
+	}
+	return written, nil
+}
+
+func (b *LocalFileBackend) AppendFile(fr io.Reader, path string) (int64, error) {
+	fp := filepath.Join(b.directory, path)
+	if _, err := os.Stat(fp); err != nil {
+		return 0, errors.Wrapf(err, "unable to find the file %s to append the data", path)
+	}
+	fw, err := os.OpenFile(fp, os.O_WRONLY|os.O_APPEND, 0600)
+	if err != nil {
+		return 0, errors.Wrapf(err, "unable to open the file %s to append the data", path)
+	}
+	defer fw.Close()
+	written, err := io.Copy(fw, fr)
+	if err != nil {
+		return written, errors.Wrapf(err, "unable append the data in the file %s", path)
+	}
+	return written, nil
+}
+
+func (b *LocalFileBackend) RemoveFile(path string) error {
+	if err := os.Remove(filepath.Join(b.directory, path)); err != nil {
+		return errors.Wrapf(err, "unable to remove the file %s", path)
+	}
+	return nil
+}
+
+func (b *LocalFileBackend) ListDirectory(path string) ([]string, error) {
+	var paths []string
+	fileInfos, err := ioutil.ReadDir(filepath.Join(b.directory, path))
+	if err != nil {
+		if os.IsNotExist(err) {
+			return paths, nil
+		}
+		return nil, errors.Wrapf(err, "unable to list the directory %s", path)
+	}
+	for _, fileInfo := range fileInfos {
+		paths = append(paths, filepath.Join(path, fileInfo.Name()))
+	}
+	return paths, nil
+}
+
+func (b *LocalFileBackend) RemoveDirectory(path string) error {
+	if err := os.RemoveAll(filepath.Join(b.directory, path)); err != nil {
+		return errors.Wrapf(err, "unable to remove the directory %s", path)
+	}
+	return nil
+}
diff --git a/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/s3_overrides.go b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/s3_overrides.go
new file mode 100644
index 00000000..e7b29b98
--- /dev/null
+++ b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/s3_overrides.go
@@ -0,0 +1,56 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package filestore
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/minio/minio-go/v7/pkg/credentials"
+)
+
+// customTransport is used to point the request to a different server.
+// This is helpful in situations where a different service is handling AWS S3 requests
+// from multiple Mattermost applications, and the Mattermost service itself does not
+// have any S3 credentials.
+type customTransport struct {
+	base   http.RoundTripper
+	host   string
+	scheme string
+	client http.Client
+}
+
+// RoundTrip implements the http.Roundtripper interface.
+func (t *customTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	// Rountrippers should not modify the original request.
+	newReq := req.Clone(context.Background())
+	*newReq.URL = *req.URL
+	req.URL.Scheme = t.scheme
+	req.URL.Host = t.host
+	return t.client.Do(req)
+}
+
+// customProvider is a dummy credentials provider for the minio client to work
+// without actually providing credentials. This is needed with a custom transport
+// in cases where the minio client does not actually have credentials with itself,
+// rather needs responses from another entity.
+//
+// It satisfies the credentials.Provider interface.
+type customProvider struct {
+	isSignV2 bool
+}
+
+// Retrieve just returns empty credentials.
+func (cp customProvider) Retrieve() (credentials.Value, error) {
+	sign := credentials.SignatureV4
+	if cp.isSignV2 {
+		sign = credentials.SignatureV2
+	}
+	return credentials.Value{
+		SignerType: sign,
+	}, nil
+}
+
+// IsExpired always returns false.
+func (cp customProvider) IsExpired() bool { return false }
diff --git a/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/s3store.go b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/s3store.go
new file mode 100644
index 00000000..5d0bf38e
--- /dev/null
+++ b/vendor/github.com/mattermost/mattermost-server/v5/shared/filestore/s3store.go
@@ -0,0 +1,442 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package filestore
+
+import (
+	"context"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	s3 "github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+	"github.com/minio/minio-go/v7/pkg/encrypt"
+	"github.com/pkg/errors"
+
+	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+)
+
+// S3FileBackend contains all necessary information to communicate with
+// an AWS S3 compatible API backend.
+type S3FileBackend struct {
+	endpoint   string
+	accessKey  string
+	secretKey  string
+	secure     bool
+	signV2     bool
+	region     string
+	bucket     string
+	pathPrefix string
+	encrypt    bool
+	trace      bool
+	client     *s3.Client
+}
+
+type S3FileBackendAuthError struct {
+	DetailedError string
+}
+
+// S3FileBackendNoBucketError is returned when testing a connection and no S3 bucket is found
+type S3FileBackendNoBucketError struct{}
+
+const (
+	// This is not exported by minio. See: https://github.com/minio/minio-go/issues/1339
+	bucketNotFound = "NoSuchBucket"
+)
+
+var (
+	imageExtensions = map[string]bool{".jpg": true, ".jpeg": true, ".gif": true, ".bmp": true, ".png": true, ".tiff": true, "tif": true}
+	imageMimeTypes  = map[string]string{".jpg": "image/jpeg", ".jpeg": "image/jpeg", ".gif": "image/gif", ".bmp": "image/bmp", ".png": "image/png", ".tiff": "image/tiff", ".tif": "image/tif"}
+)
+
+func isFileExtImage(ext string) bool {
+	ext = strings.ToLower(ext)
+	return imageExtensions[ext]
+}
+
+func getImageMimeType(ext string) string {
+	ext = strings.ToLower(ext)
+	if imageMimeTypes[ext] == "" {
+		return "image"
+	}
+	return imageMimeTypes[ext]
+}
+
+func (s *S3FileBackendAuthError) Error() string {
+	return s.DetailedError
+}
+
+func (s *S3FileBackendNoBucketError) Error() string {
+	return "no such bucket"
+}
+
+// NewS3FileBackend returns an instance of an S3FileBackend.
+func NewS3FileBackend(settings FileBackendSettings) (*S3FileBackend, error) {
+	backend := &S3FileBackend{
+		endpoint:   settings.AmazonS3Endpoint,
+		accessKey:  settings.AmazonS3AccessKeyId,
+		secretKey:  settings.AmazonS3SecretAccessKey,
+		secure:     settings.AmazonS3SSL,
+		signV2:     settings.AmazonS3SignV2,
+		region:     settings.AmazonS3Region,
+		bucket:     settings.AmazonS3Bucket,
+		pathPrefix: settings.AmazonS3PathPrefix,
+		encrypt:    settings.AmazonS3SSE,
+		trace:      settings.AmazonS3Trace,
+	}
+	cli, err := backend.s3New()
+	if err != nil {
+		return nil, err
+	}
+	backend.client = cli
+	return backend, nil
+}
+
+// Similar to s3.New() but allows initialization of signature v2 or signature v4 client.
+// If signV2 input is false, function always returns signature v4.
+//
+// Additionally this function also takes a user defined region, if set
+// disables automatic region lookup.
+func (b *S3FileBackend) s3New() (*s3.Client, error) {
+	var creds *credentials.Credentials
+
+	isCloud := os.Getenv("MM_CLOUD_FILESTORE_BIFROST") != ""
+	if isCloud {
+		creds = credentials.New(customProvider{isSignV2: b.signV2})
+	} else if b.accessKey == "" && b.secretKey == "" {
+		creds = credentials.NewIAM("")
+	} else if b.signV2 {
+		creds = credentials.NewStatic(b.accessKey, b.secretKey, "", credentials.SignatureV2)
+	} else {
+		creds = credentials.NewStatic(b.accessKey, b.secretKey, "", credentials.SignatureV4)
+	}
+
+	opts := s3.Options{
+		Creds:  creds,
+		Secure: b.secure,
+		Region: b.region,
+	}
+
+	// If this is a cloud installation, we override the default transport.
+	if isCloud {
+		tr, err := s3.DefaultTransport(b.secure)
+		if err != nil {
+			return nil, err
+		}
+		scheme := "http"
+		if b.secure {
+			scheme = "https"
+		}
+		opts.Transport = &customTransport{
+			base:   tr,
+			host:   b.endpoint,
+			scheme: scheme,
+		}
+	}
+
+	s3Clnt, err := s3.New(b.endpoint, &opts)
+	if err != nil {
+		return nil, err
+	}
+
+	if b.trace {
+		s3Clnt.TraceOn(os.Stdout)
+	}
+
+	return s3Clnt, nil
+}
+
+func (b *S3FileBackend) TestConnection() error {
+	exists := true
+	var err error
+	// If a path prefix is present, we attempt to test the bucket by listing objects under the path
+	// and just checking the first response. This is because the BucketExists call is only at a bucket level
+	// and sometimes the user might only be allowed access to the specified path prefix.
+	if b.pathPrefix != "" {
+		obj := <-b.client.ListObjects(context.Background(), b.bucket, s3.ListObjectsOptions{Prefix: b.pathPrefix})
+		if obj.Err != nil {
+			typedErr := s3.ToErrorResponse(obj.Err)
+			if typedErr.Code != bucketNotFound {
+				return &S3FileBackendAuthError{DetailedError: "unable to list objects in the S3 bucket"}
+			}
+			exists = false
+		}
+	} else {
+		exists, err = b.client.BucketExists(context.Background(), b.bucket)
+		if err != nil {
+			return &S3FileBackendAuthError{DetailedError: "unable to check if the S3 bucket exists"}
+		}
+	}
+
+	if !exists {
+		return &S3FileBackendNoBucketError{}
+	}
+	mlog.Debug("Connection to S3 or minio is good. Bucket exists.")
+	return nil
+}
+
+func (b *S3FileBackend) MakeBucket() error {
+	err := b.client.MakeBucket(context.Background(), b.bucket, s3.MakeBucketOptions{Region: b.region})
+	if err != nil {
+		return errors.Wrap(err, "unable to create the s3 bucket")
+	}
+	return nil
+}
+
+// Caller must close the first return value
+func (b *S3FileBackend) Reader(path string) (ReadCloseSeeker, error) {
+	path = filepath.Join(b.pathPrefix, path)
+	minioObject, err := b.client.GetObject(context.Background(), b.bucket, path, s3.GetObjectOptions{})
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to open file %s", path)
+	}
+
+	return minioObject, nil
+}
+
+func (b *S3FileBackend) ReadFile(path string) ([]byte, error) {
+	path = filepath.Join(b.pathPrefix, path)
+	minioObject, err := b.client.GetObject(context.Background(), b.bucket, path, s3.GetObjectOptions{})
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to open file %s", path)
+	}
+
+	defer minioObject.Close()
+	f, err := ioutil.ReadAll(minioObject)
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to read file %s", path)
+	}
+	return f, nil
+}
+
+func (b *S3FileBackend) FileExists(path string) (bool, error) {
+	path = filepath.Join(b.pathPrefix, path)
+
+	_, err := b.client.StatObject(context.Background(), b.bucket, path, s3.StatObjectOptions{})
+	if err == nil {
+		return true, nil
+	}
+
+	var s3Err s3.ErrorResponse
+	if errors.As(err, &s3Err); s3Err.Code == "NoSuchKey" {
+		return false, nil
+	}
+
+	return false, errors.Wrapf(err, "unable to know if file %s exists", path)
+}
+
+func (b *S3FileBackend) FileSize(path string) (int64, error) {
+	path = filepath.Join(b.pathPrefix, path)
+
+	info, err := b.client.StatObject(context.Background(), b.bucket, path, s3.StatObjectOptions{})
+	if err != nil {
+		return 0, errors.Wrapf(err, "unable to get file size for %s", path)
+	}
+
+	return info.Size, nil
+}
+
+func (b *S3FileBackend) FileModTime(path string) (time.Time, error) {
+	path = filepath.Join(b.pathPrefix, path)
+
+	info, err := b.client.StatObject(context.Background(), b.bucket, path, s3.StatObjectOptions{})
+	if err != nil {
+		return time.Time{}, errors.Wrapf(err, "unable to get modification time for file %s", path)
+	}
+
+	return info.LastModified, nil
+}
+
+func (b *S3FileBackend) CopyFile(oldPath, newPath string) error {
+	oldPath = filepath.Join(b.pathPrefix, oldPath)
+	newPath = filepath.Join(b.pathPrefix, newPath)
+	srcOpts := s3.CopySrcOptions{
+		Bucket:     b.bucket,
+		Object:     oldPath,
+		Encryption: encrypt.NewSSE(),
+	}
+	dstOpts := s3.CopyDestOptions{
+		Bucket:     b.bucket,
+		Object:     newPath,
+		Encryption: encrypt.NewSSE(),
+	}
+	if _, err := b.client.CopyObject(context.Background(), dstOpts, srcOpts); err != nil {
+		return errors.Wrapf(err, "unable to copy file from %s to %s", oldPath, newPath)
+	}
+	return nil
+}
+
+func (b *S3FileBackend) MoveFile(oldPath, newPath string) error {
+	oldPath = filepath.Join(b.pathPrefix, oldPath)
+	newPath = filepath.Join(b.pathPrefix, newPath)
+	srcOpts := s3.CopySrcOptions{
+		Bucket:     b.bucket,
+		Object:     oldPath,
+		Encryption: encrypt.NewSSE(),
+	}
+	dstOpts := s3.CopyDestOptions{
+		Bucket:     b.bucket,
+		Object:     newPath,
+		Encryption: encrypt.NewSSE(),
+	}
+
+	if _, err := b.client.CopyObject(context.Background(), dstOpts, srcOpts); err != nil {
+		return errors.Wrapf(err, "unable to copy the file to %s to the new destionation", newPath)
+	}
+
+	if err := b.client.RemoveObject(context.Background(), b.bucket, oldPath, s3.RemoveObjectOptions{}); err != nil {
+		return errors.Wrapf(err, "unable to remove the file old file %s", oldPath)
+	}
+
+	return nil
+}
+
+func (b *S3FileBackend) WriteFile(fr io.Reader, path string) (int64, error) {
+	var contentType string
+	path = filepath.Join(b.pathPrefix, path)
+	if ext := filepath.Ext(path); isFileExtImage(ext) {
+		contentType = getImageMimeType(ext)
+	} else {
+		contentType = "binary/octet-stream"
+	}
+
+	options := s3PutOptions(b.encrypt, contentType)
+	info, err := b.client.PutObject(context.Background(), b.bucket, path, fr, -1, options)
+	if err != nil {
+		return info.Size, errors.Wrapf(err, "unable write the data in the file %s", path)
+	}
+
+	return info.Size, nil
+}
+
+func (b *S3FileBackend) AppendFile(fr io.Reader, path string) (int64, error) {
+	fp := filepath.Join(b.pathPrefix, path)
+	if _, err := b.client.StatObject(context.Background(), b.bucket, fp, s3.StatObjectOptions{}); err != nil {
+		return 0, errors.Wrapf(err, "unable to find the file %s to append the data", path)
+	}
+
+	var contentType string
+	if ext := filepath.Ext(fp); isFileExtImage(ext) {
+		contentType = getImageMimeType(ext)
+	} else {
+		contentType = "binary/octet-stream"
+	}
+
+	options := s3PutOptions(b.encrypt, contentType)
+	sse := options.ServerSideEncryption
+	partName := fp + ".part"
+	info, err := b.client.PutObject(context.Background(), b.bucket, partName, fr, -1, options)
+	defer b.client.RemoveObject(context.Background(), b.bucket, partName, s3.RemoveObjectOptions{})
+	if info.Size > 0 {
+		src1Opts := s3.CopySrcOptions{
+			Bucket: b.bucket,
+			Object: fp,
+		}
+		src2Opts := s3.CopySrcOptions{
+			Bucket: b.bucket,
+			Object: partName,
+		}
+		dstOpts := s3.CopyDestOptions{
+			Bucket:     b.bucket,
+			Object:     fp,
+			Encryption: sse,
+		}
+		_, err = b.client.ComposeObject(context.Background(), dstOpts, src1Opts, src2Opts)
+		if err != nil {
+			return 0, errors.Wrapf(err, "unable append the data in the file %s", path)
+		}
+		return info.Size, nil
+	}
+
+	return 0, errors.Wrapf(err, "unable append the data in the file %s", path)
+}
+
+func (b *S3FileBackend) RemoveFile(path string) error {
+	path = filepath.Join(b.pathPrefix, path)
+	if err := b.client.RemoveObject(context.Background(), b.bucket, path, s3.RemoveObjectOptions{}); err != nil {
+		return errors.Wrapf(err, "unable to remove the file %s", path)
+	}
+
+	return nil
+}
+
+func getPathsFromObjectInfos(in <-chan s3.ObjectInfo) <-chan s3.ObjectInfo {
+	out := make(chan s3.ObjectInfo, 1)
+
+	go func() {
+		defer close(out)
+
+		for {
+			info, done := <-in
+
+			if !done {
+				break
+			}
+
+			out <- info
+		}
+	}()
+
+	return out
+}
+
+func (b *S3FileBackend) ListDirectory(path string) ([]string, error) {
+	path = filepath.Join(b.pathPrefix, path)
+	if !strings.HasSuffix(path, "/") && path != "" {
+		// s3Clnt returns only the path itself when "/" is not present
+		// appending "/" to make it consistent across all filestores
+		path = path + "/"
+	}
+
+	opts := s3.ListObjectsOptions{
+		Prefix: path,
+	}
+	var paths []string
+	for object := range b.client.ListObjects(context.Background(), b.bucket, opts) {
+		if object.Err != nil {
+			return nil, errors.Wrapf(object.Err, "unable to list the directory %s", path)
+		}
+		// We strip the path prefix that gets applied,
+		// so that it remains transparent to the application.
+		object.Key = strings.TrimPrefix(object.Key, b.pathPrefix)
+		trimmed := strings.Trim(object.Key, "/")
+		if trimmed != "" {
+			paths = append(paths, trimmed)
+		}
+	}
+
+	return paths, nil
+}
+
+func (b *S3FileBackend) RemoveDirectory(path string) error {
+	opts := s3.ListObjectsOptions{
+		Prefix:    filepath.Join(b.pathPrefix, path),
+		Recursive: true,
+	}
+	list := b.client.ListObjects(context.Background(), b.bucket, opts)
+	objectsCh := b.client.RemoveObjects(context.Background(), b.bucket, getPathsFromObjectInfos(list), s3.RemoveObjectsOptions{})
+	for err := range objectsCh {
+		if err.Err != nil {
+			return errors.Wrapf(err.Err, "unable to remove the directory %s", path)
+		}
+	}
+
+	return nil
+}
+
+func s3PutOptions(encrypted bool, contentType string) s3.PutObjectOptions {
+	options := s3.PutObjectOptions{}
+	if encrypted {
+		options.ServerSideEncryption = encrypt.NewSSE()
+	}
+	options.ContentType = contentType
+	// We set the part size to the minimum allowed value of 5MBs
+	// to avoid an excessive allocation in minio.PutObject implementation.
+	options.PartSize = 1024 * 1024 * 5
+
+	return options
+}