feat(libreoffice): add image options (#898)

* feat: libre office image options

* refactor: PR comment changes

* fix: change lossLessImageCompression default to false

---------

Co-authored-by: Gareth Judson <gareth.judson@delwp.vic.gov.au>

pkg/modules/libreoffice/api/api.go

@@ -58,6 +58,14 @@ type Options struct {
 	// Optional
 	SinglePageSheets bool
 
+	// LosslessImageCompression allows turning lossless compression on or off to tweak image conversion performance.
+	// Optional
+	LosslessImageCompression bool
+
+	// ReduceImageResolution allows turning on or off image resolution reduction to tweak image conversion performance.
+	// Optional
+	ReduceImageResolution bool
+
 	// PdfFormats allows to convert the resulting PDF to PDF/A-1b, PDF/A-2b,
 	// PDF/A-3b and PDF/UA.
 	// Optional.

pkg/modules/libreoffice/api/libreoffice.go

@@ -281,6 +281,14 @@ func (p *libreOfficeProcess) pdf(ctx context.Context, logger *zap.Logger, inputP
 		args = append(args, "--export", "SinglePageSheets=true")
 	}
 
+	if options.LosslessImageCompression {
+		args = append(args, "--export", "UseLosslessCompression=true")
+	}
+
+	if !options.ReduceImageResolution {
+		args = append(args, "--export", "ReduceImageResolution=false")
+	}
+
 	switch options.PdfFormats.PdfA {
 	case "":
 	case gotenberg.PdfA1b:

pkg/modules/libreoffice/api/libreoffice_test.go

@@ -451,6 +451,64 @@ func TestLibreOfficeProcess_pdf(t *testing.T) {
 			start:        true,
 			expectError:  false,
 		},
+		{
+			scenario: "success LosslessImageCompression",
+			libreOffice: newLibreOfficeProcess(
+				libreOfficeArguments{
+					binPath:      os.Getenv("LIBREOFFICE_BIN_PATH"),
+					unoBinPath:   os.Getenv("UNOCONVERTER_BIN_PATH"),
+					startTimeout: 5 * time.Second,
+				},
+			),
+			fs: func() *gotenberg.FileSystem {
+				fs := gotenberg.NewFileSystem()
+
+				err := os.MkdirAll(fs.WorkingDirPath(), 0o755)
+				if err != nil {
+					t.Fatalf(fmt.Sprintf("expected no error but got: %v", err))
+				}
+
+				err = os.WriteFile(fmt.Sprintf("%s/document.txt", fs.WorkingDirPath()), []byte("LosslessImageCompression"), 0o755)
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+
+				return fs
+			}(),
+			options:      Options{LosslessImageCompression: true},
+			cancelledCtx: false,
+			start:        true,
+			expectError:  false,
+		},
+		{
+			scenario: "success ReduceImageResolution",
+			libreOffice: newLibreOfficeProcess(
+				libreOfficeArguments{
+					binPath:      os.Getenv("LIBREOFFICE_BIN_PATH"),
+					unoBinPath:   os.Getenv("UNOCONVERTER_BIN_PATH"),
+					startTimeout: 5 * time.Second,
+				},
+			),
+			fs: func() *gotenberg.FileSystem {
+				fs := gotenberg.NewFileSystem()
+
+				err := os.MkdirAll(fs.WorkingDirPath(), 0o755)
+				if err != nil {
+					t.Fatalf(fmt.Sprintf("expected no error but got: %v", err))
+				}
+
+				err = os.WriteFile(fmt.Sprintf("%s/document.txt", fs.WorkingDirPath()), []byte("ReduceImageResolution"), 0o755)
+				if err != nil {
+					t.Fatalf("expected no error but got: %v", err)
+				}
+
+				return fs
+			}(),
+			options:      Options{ReduceImageResolution: false},
+			cancelledCtx: false,
+			start:        true,
+			expectError:  false,
+		},
 		{
 			scenario: "success (PDF/A-1b)",
 			libreOffice: newLibreOfficeProcess(

pkg/modules/libreoffice/routes.go

@@ -30,6 +30,8 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 				nativePageRanges         string
 				exportFormFields         bool
 				singlePageSheets         bool
+				losslessImageCompression bool
+				reduceImageResolution    bool
 				pdfa                     string
 				pdfua                    bool
 				nativePdfFormats         bool
@@ -43,6 +45,8 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 				String("nativePageRanges", &nativePageRanges, "").
 				Bool("exportFormFields", &exportFormFields, true).
 				Bool("singlePageSheets", &singlePageSheets, false).
+				Bool("losslessImageCompression", &losslessImageCompression, false).
+				Bool("reduceImageResolution", &reduceImageResolution, true).
 				String("pdfa", &pdfa, "").
 				Bool("pdfua", &pdfua, false).
 				Bool("nativePdfFormats", &nativePdfFormats, true).
@@ -75,6 +79,8 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 					PageRanges:               nativePageRanges,
 					ExportFormFields:         exportFormFields,
 					SinglePageSheets:         singlePageSheets,
+					LosslessImageCompression: losslessImageCompression,
+					ReduceImageResolution:    reduceImageResolution,
 				}
 
 				if nativePdfFormats {