now using latest version of unoconv, allowing to specify paper size and orientation + updating go client (#24)

internal/pkg/printer/office.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strconv"
 	"sync"
 
 	"github.com/thecodingmachine/gotenberg/internal/pkg/rand"
@@ -16,8 +17,11 @@ var mu sync.Mutex
 
 // Office facilitates Office documents to PDF conversion.
 type Office struct {
-	Context   context.Context
-	FilePaths []string
+	Context     context.Context
+	FilePaths   []string
+	PaperWidth  float64
+	PaperHeight float64
+	Landscape   bool
 }
 
 // Print converts Office documents to PDF.
@@ -32,14 +36,24 @@ func (o *Office) Print(destination string) error {
 			return err
 		}
 		tmpDest := fmt.Sprintf("%s/%s.pdf", dirPath, baseFilename)
+		paperSize, err := unoconvPaperSize(o.PaperWidth, o.PaperHeight)
+		if err != nil {
+			return err
+		}
+		cmdArgs := []string{
+			"--format",
+			"pdf",
+			"--printer",
+			paperSize,
+		}
+		if o.Landscape {
+			cmdArgs = append(cmdArgs, "--printer", "PaperOrientation=landscape")
+		}
+		cmdArgs = append(cmdArgs, "--output", tmpDest, fpath)
 		cmd := exec.CommandContext(
 			o.Context,
 			"unoconv",
-			"--format",
-			"pdf",
-			"--output",
-			tmpDest,
-			fpath,
+			cmdArgs...,
 		)
 		_, err = cmd.Output()
 		if o.Context.Err() == context.DeadlineExceeded {
@@ -56,6 +70,18 @@ func (o *Office) Print(destination string) error {
 	return Merge(fpaths, destination)
 }
 
+func unoconvPaperSize(paperWidth, paperHeight float64) (string, error) {
+	width, err := strconv.Atoi(fmt.Sprintf("%.0f", paperWidth*25.4))
+	if err != nil {
+		return "", fmt.Errorf("%0.f: converting width to millimiter: %v", paperWidth, err)
+	}
+	height, err := strconv.Atoi(fmt.Sprintf("%.0f", paperHeight*25.4))
+	if err != nil {
+		return "", fmt.Errorf("%0.f: converting height to millimiter: %v", paperHeight, err)
+	}
+	return fmt.Sprintf("PaperSize=%dx%d", width, height), nil
+}
+
 // Compile-time checks to ensure type implements desired interfaces.
 var (
 	_ = Printer(new(Office))