focalboard/server/app/files.go

package app

import (
	"fmt"
	"io"
	"path/filepath"
	"strings"

	"github.com/mattermost/focalboard/server/services/mlog"
	"github.com/mattermost/focalboard/server/utils"

	"github.com/mattermost/mattermost-server/v5/shared/filestore"
)

func (a *App) SaveFile(reader io.Reader, workspaceID, rootID, filename string) (string, error) {
	// NOTE: File extension includes the dot
	fileExtension := strings.ToLower(filepath.Ext(filename))
	if fileExtension == ".jpeg" {
		fileExtension = ".jpg"
	}

	createdFilename := fmt.Sprintf(`%s%s`, utils.CreateGUID(), fileExtension)
	filePath := filepath.Join(workspaceID, rootID, createdFilename)

	_, appErr := a.filesBackend.WriteFile(reader, filePath)
	if appErr != nil {
		return "", fmt.Errorf("unable to store the file in the files storage: %w", appErr)
	}

	return createdFilename, nil
}

func (a *App) GetFileReader(workspaceID, rootID, filename string) (filestore.ReadCloseSeeker, error) {
	filePath := filepath.Join(workspaceID, rootID, filename)
	exists, err := a.filesBackend.FileExists(filePath)
	if err != nil {
		return nil, err
	}
	// FIXUP: Check the deprecated old location
	if workspaceID == "0" && !exists {
		oldExists, err2 := a.filesBackend.FileExists(filename)
		if err2 != nil {
			return nil, err2
		}
		if oldExists {
			err2 := a.filesBackend.MoveFile(filename, filePath)
			if err2 != nil {
				a.logger.Error("ERROR moving file",
					mlog.String("old", filename),
					mlog.String("new", filePath),
					mlog.Err(err2),
				)
			} else {
				a.logger.Debug("Moved file",
					mlog.String("old", filename),
					mlog.String("new", filePath),
				)
			}
		}
	}

	reader, err := a.filesBackend.Reader(filePath)
	if err != nil {
		return nil, err
	}

	return reader, nil
}