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feat(pdfengines): add watermark and stamp feature

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This commit is contained in:
Julien Neuhart
2026-03-18 04:46:12 +01:00
parent 4ac493250c
commit 19db80bc2e
26 changed files with 1351 additions and 50 deletions
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58
pkg/modules/pdftk/pdftk.go
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@@ -203,6 +203,64 @@ func (engine *PdfTk) EmbedFiles(ctx context.Context, logger *zap.Logger, filePat
return fmt.Errorf("embed files with PDFtk: %w", gotenberg.ErrPdfEngineMethodNotSupported)
}
// Watermark applies a watermark (behind page content) to a PDF file using PDFtk.
// Only PDF source is supported.
func (engine *PdfTk) Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
if stamp.Source != gotenberg.StampSourcePDF {
return fmt.Errorf("watermark PDF with PDFtk: %w", gotenberg.ErrPdfStampSourceNotSupported)
}
tmpPath := inputPath + ".tmp"
args := []string{inputPath, "background", stamp.Expression, "output", tmpPath}
cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
if err != nil {
return fmt.Errorf("create command: %w", err)
}
_, err = cmd.Exec()
if err != nil {
return fmt.Errorf("watermark PDF with PDFtk: %w", err)
}
err = os.Rename(tmpPath, inputPath)
if err != nil {
return fmt.Errorf("rename temporary output file with input file: %w", err)
}
return nil
}
// Stamp applies a stamp (on top of page content) to a PDF file using PDFtk.
// Only PDF source is supported.
func (engine *PdfTk) Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
if stamp.Source != gotenberg.StampSourcePDF {
return fmt.Errorf("stamp PDF with PDFtk: %w", gotenberg.ErrPdfStampSourceNotSupported)
}
tmpPath := inputPath + ".tmp"
args := []string{inputPath, "stamp", stamp.Expression, "output", tmpPath}
cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
if err != nil {
return fmt.Errorf("create command: %w", err)
}
_, err = cmd.Exec()
if err != nil {
return fmt.Errorf("stamp PDF with PDFtk: %w", err)
}
err = os.Rename(tmpPath, inputPath)
if err != nil {
return fmt.Errorf("rename temporary output file with input file: %w", err)
}
return nil
}
// Interface guards.
var (
_ gotenberg.Module = (*PdfTk)(nil)