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feat(pdfengines): optimize PDF images to reduce file size (#359)

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This commit is contained in:
Julien Neuhart
2026-08-13 19:39:09 +02:00
parent 7a730cfdc2
commit 1ac1d9887e
29 changed files with 776 additions and 5 deletions
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5
pkg/gotenberg/mocks.go
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@@ -49,6 +49,7 @@ type PdfEngineMock struct {
SplitMock func(ctx context.Context, logger *slog.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error)
FlattenMock func(ctx context.Context, logger *slog.Logger, inputPath string) error
ConvertMock func(ctx context.Context, logger *slog.Logger, formats PdfFormats, inputPath, outputPath string) error
OptimizeImagesMock func(ctx context.Context, logger *slog.Logger, imageQuality int, inputPath string) error
ReadMetadataMock func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error)
PageCountMock func(ctx context.Context, logger *slog.Logger, inputPath string) (int, error)
WriteMetadataMock func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error
@@ -80,6 +81,10 @@ func (engine *PdfEngineMock) Convert(ctx context.Context, logger *slog.Logger, f
return engine.ConvertMock(ctx, logger, formats, inputPath, outputPath)
}
func (engine *PdfEngineMock) OptimizeImages(ctx context.Context, logger *slog.Logger, imageQuality int, inputPath string) error {
return engine.OptimizeImagesMock(ctx, logger, imageQuality, inputPath)
}
func (engine *PdfEngineMock) ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
return engine.ReadMetadataMock(ctx, logger, inputPath)
}

6
pkg/gotenberg/pdfengine.go
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@@ -281,6 +281,12 @@ type PdfEngine interface {
// PdfFormats. If no format, it does nothing.
Convert(ctx context.Context, logger *slog.Logger, formats PdfFormats, inputPath, outputPath string) error
// OptimizeImages re-encodes the raster images of a PDF in place to shrink
// the file, leaving text, vectors, fonts and structure untouched.
// imageQuality is the JPEG quality (1 to 100) applied to each re-encoded
// image.
OptimizeImages(ctx context.Context, logger *slog.Logger, imageQuality int, inputPath string) error
// ReadMetadata extracts the metadata of a given PDF file.
ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error)