hunk.code_window: 	"github.com/mattermost/mattermost-server/model"
   )
   type FileBackend interface {
   	TestConnection() *model.AppError
  
hunk.labels: keep keep add keep keep keep
hunk.after_edit: type ReadCloseSeeker interface {
   	io.ReadCloser
   	io.Seeker
   }
  
hunk.file_path: services/filesstore/filesstore.go
hunk.type: add
file: // Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
  // See License.txt for license information.
  
  package filesstore
  
  import (
  	"io"
  	"net/http"
  
  	"github.com/mattermost/mattermost-server/model"
  )
  
  type FileBackend interface {
  	TestConnection() *model.AppError
  
  	Reader(path string) (io.ReadCloser, *model.AppError)
  	ReadFile(path string) ([]byte, *model.AppError)
  	FileExists(path string) (bool, *model.AppError)
  	CopyFile(oldPath, newPath string) *model.AppError
  	MoveFile(oldPath, newPath string) *model.AppError
  	WriteFile(fr io.Reader, path string) (int64, *model.AppError)
  	RemoveFile(path string) *model.AppError
  
  	ListDirectory(path string) (*[]string, *model.AppError)
  	RemoveDirectory(path string) *model.AppError
  }
  
  func NewFileBackend(settings *model.FileSettings, enableComplianceFeatures bool) (FileBackend, *model.AppError) {
  	switch *settings.DriverName {
  	case model.IMAGE_DRIVER_S3:
  		return &S3FileBackend{
  			endpoint:  *settings.AmazonS3Endpoint,
  			accessKey: *settings.AmazonS3AccessKeyId,
  			secretKey: *settings.AmazonS3SecretAccessKey,
  			secure:    settings.AmazonS3SSL == nil || *settings.AmazonS3SSL,
  			signV2:    settings.AmazonS3SignV2 != nil && *settings.AmazonS3SignV2,
  			region:    *settings.AmazonS3Region,
  			bucket:    *settings.AmazonS3Bucket,
  			encrypt:   settings.AmazonS3SSE != nil && *settings.AmazonS3SSE && enableComplianceFeatures,
  			trace:     settings.AmazonS3Trace != nil && *settings.AmazonS3Trace,
  		}, nil
  	case model.IMAGE_DRIVER_LOCAL:
  		return &LocalFileBackend{
  			directory: *settings.Directory,
  		}, nil
  	}
  	return nil, model.NewAppError("NewFileBackend", "api.file.no_driver.app_error", nil, "", http.StatusInternalServerError)
  }
  