mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2024-12-12 16:50:28 +01:00
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
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package media
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import (
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"context"
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"os"
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"strings"
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terminator "codeberg.org/superseriousbusiness/exif-terminator"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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)
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// clearMetadata performs our best-attempt at cleaning metadata from
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// input file. Depending on file type this may perform a full EXIF clean,
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// or just a clean of global container level metadata records.
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func clearMetadata(ctx context.Context, filepath string) error {
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var ext, outpath string
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// Generate cleaned output path MAINTAINING extension.
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if i := strings.IndexByte(filepath, '.'); i != -1 {
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outpath = filepath[:i] + "_cleaned" + filepath[i:]
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ext = filepath[i+1:]
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} else {
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return gtserror.New("input file missing extension")
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}
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switch ext {
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case "jpeg", "png", "webp":
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// For these few file types, we actually support
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// cleaning exif data using a native Go library.
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log.Debug(ctx, "cleaning with exif-terminator")
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err := terminateExif(outpath, filepath, ext)
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if err == nil {
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// No problem.
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break
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}
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log.Warnf(ctx, "error cleaning with exif-terminator, falling back to ffmpeg: %v", err)
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fallthrough
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default:
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// For all other types, best-effort clean with ffmpeg.
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log.Debug(ctx, "cleaning with ffmpeg -map_metadata -1")
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err := ffmpegClearMetadata(ctx, outpath, filepath)
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if err != nil {
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return err
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}
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}
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// Move the new output file path to original location.
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if err := os.Rename(outpath, filepath); err != nil {
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return gtserror.Newf("error renaming %s -> %s: %w", outpath, filepath, err)
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}
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return nil
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}
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// terminateExif cleans exif data from file at input path, into file
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// at output path, using given file extension to determine cleaning type.
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func terminateExif(outpath, inpath string, ext string) error {
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// Open input file at given path.
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inFile, err := os.Open(inpath)
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if err != nil {
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return gtserror.Newf("error opening input file %s: %w", inpath, err)
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}
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defer inFile.Close()
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// Open output file at given path.
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outFile, err := os.Create(outpath)
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if err != nil {
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return gtserror.Newf("error opening output file %s: %w", outpath, err)
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}
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defer outFile.Close()
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// Terminate EXIF data from 'inFile' -> 'outFile'.
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err = terminator.TerminateInto(outFile, inFile, ext)
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if err != nil {
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return gtserror.Newf("error terminating exif data: %w", err)
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}
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return nil
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}
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