mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-30 15:42:46 +00:00
889d4756ea
* use native Go code to probe JPEGs * add note about copying from github.com/disintegration/imaging * add more code comments
100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package media
|
|
|
|
import (
|
|
"context"
|
|
"os"
|
|
"strings"
|
|
|
|
terminator "codeberg.org/superseriousbusiness/exif-terminator"
|
|
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
|
|
"github.com/superseriousbusiness/gotosocial/internal/log"
|
|
)
|
|
|
|
// clearMetadata performs our best-attempt at cleaning metadata from
|
|
// input file. Depending on file type this may perform a full EXIF clean,
|
|
// or just a clean of global container level metadata records.
|
|
func clearMetadata(ctx context.Context, filepath string) error {
|
|
var ext, outpath string
|
|
|
|
// Generate cleaned output path MAINTAINING extension.
|
|
if i := strings.IndexByte(filepath, '.'); i != -1 {
|
|
outpath = filepath[:i] + "_cleaned" + filepath[i:]
|
|
ext = filepath[i+1:]
|
|
} else {
|
|
return gtserror.New("input file missing extension")
|
|
}
|
|
|
|
switch ext {
|
|
case "jpeg", "png", "webp":
|
|
// For these few file types, we actually support
|
|
// cleaning exif data using a native Go library.
|
|
log.Debug(ctx, "cleaning with exif-terminator")
|
|
err := terminateExif(outpath, filepath, ext)
|
|
if err == nil {
|
|
// No problem.
|
|
break
|
|
}
|
|
|
|
log.Warnf(ctx, "error cleaning with exif-terminator, falling back to ffmpeg: %v", err)
|
|
fallthrough
|
|
|
|
default:
|
|
// For all other types, best-effort clean with ffmpeg.
|
|
log.Debug(ctx, "cleaning with ffmpeg -map_metadata -1")
|
|
err := ffmpegClearMetadata(ctx, outpath, filepath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Move the new output file path to original location.
|
|
if err := os.Rename(outpath, filepath); err != nil {
|
|
return gtserror.Newf("error renaming %s -> %s: %w", outpath, filepath, err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// terminateExif cleans exif data from file at input path, into file
|
|
// at output path, using given file extension to determine cleaning type.
|
|
func terminateExif(outpath, inpath string, ext string) error {
|
|
// Open input file at given path.
|
|
inFile, err := os.Open(inpath)
|
|
if err != nil {
|
|
return gtserror.Newf("error opening input file %s: %w", inpath, err)
|
|
}
|
|
defer inFile.Close()
|
|
|
|
// Open output file at given path.
|
|
outFile, err := os.Create(outpath)
|
|
if err != nil {
|
|
return gtserror.Newf("error opening output file %s: %w", outpath, err)
|
|
}
|
|
defer outFile.Close()
|
|
|
|
// Terminate EXIF data from 'inFile' -> 'outFile'.
|
|
err = terminator.TerminateInto(outFile, inFile, ext)
|
|
if err != nil {
|
|
return gtserror.Newf("error terminating exif data: %w", err)
|
|
}
|
|
|
|
return nil
|
|
}
|