Truy cập API để tạo và xử lý tài liệu PDF 

Cài đặt gofpdf qua GitHub

go get github.com/unidoc/unipdf/v3

Để có bản cập nhật mới nhất, vui lòng truy cập trang phát hành của sản phẩm.

 // Images to PDF.
func imagesToPdf(inputPaths []string, outputPath string) error {
	c := creator.New()
	for _, imgPath := range inputPaths {
		common.Log.Debug("Image: %s", imgPath)
		img, err := c.NewImageFromFile(imgPath)
		if err != nil {
			common.Log.Debug("Error loading image: %v", err)
			return err
		}
		img.ScaleToWidth(612.0)
		// Use page width of 612 points, and calculate the height proportionally based on the image.
		// Standard PPI is 72 points per inch, thus a width of 8.5"
		height := 612.0 * img.Height() / img.Width()
		c.SetPageSize(creator.PageSize{612, height})
		c.NewPage()
		img.SetPos(0, 0)
		_ = c.Draw(img)
	}
	err := c.WriteToFile(outputPath)
	return err
}
  

func protectPdf(inputPath string, outputPath string, userPassword, ownerPassword string) error {
	permissions := security.PermPrinting | // Allow printing with low quality
		security.PermFullPrintQuality |
		security.PermModify | // Allow modifications.
		security.PermAnnotate | // Allow annotations.
		security.PermFillForms |
		security.PermRotateInsert | // Allow modifying page order, rotating pages etc.
		security.PermExtractGraphics | // Allow extracting graphics.
		security.PermDisabilityExtract // Allow extracting graphics (accessibility)
	encryptOptions := &model.EncryptOptions{
		Permissions: permissions,
	}
	f, err := os.Open(inputPath)
	if err != nil {
		return err
	}
	defer f.Close()
	pdfReader, err := model.NewPdfReader(f)
	if err != nil {
		return err
	}
	isEncrypted, err := pdfReader.IsEncrypted()
	if err != nil {
		return err
	}
	if isEncrypted {
		return fmt.Errorf("The PDF is already locked (need to unlock first)")
	}
	// Generate a PdfWriter instance from existing PdfReader.
	pdfWriter, err := pdfReader.ToWriter(nil)
	if err != nil {
		return err
	}
	// Encrypt document before writing to file.
	err = pdfWriter.Encrypt([]byte(userPassword), []byte(ownerPassword), encryptOptions)
	if err != nil {
		return err
	}
	// Write to file.
	err = pdfWriter.WriteToFile(outputPath)
	return err
}