Go SDK を使用した PDF のパスワード変更

    package main

import (
	"encoding/base64"
	"fmt"
	"os"
	"path"
	"path/filepath"

	asposepdfcloud "github.com/aspose-pdf-cloud/aspose-pdf-cloud-go/v25"
)

// Upload local file to the remote folder with check errors
func uploadFile(pdf_api *asposepdfcloud.PdfApiService, name string) {
	args := map[string]interface{}{
		"folder": REMOTE_FOLDER,
	}
	file, err := os.Open(filepath.Join(LOCAL_FOLDER, name))
	if err != nil {
		fmt.Println(err.Error())
	} else {
		result, httpResponse, err := pdf_api.UploadFile(path.Join(REMOTE_FOLDER, name), file, args)
		if err != nil {
			fmt.Println(err.Error())
		} else if httpResponse.StatusCode < 200 || httpResponse.StatusCode > 299 {
			fmt.Println("Unexpected error!")
		} else {
			fmt.Println(result)
		}
	}
}

// Download file from remote folder and save it locally with check errors
func downloadFile(pdf_api *asposepdfcloud.PdfApiService, name string, output_name string) {
	args := map[string]interface{}{
		"folder": REMOTE_FOLDER,
	}
	result_data, httpResponse, err := pdf_api.DownloadFile(path.Join(REMOTE_FOLDER, name), args)
	if err != nil {
		fmt.Println(err.Error())
	} else if httpResponse.StatusCode < 200 || httpResponse.StatusCode > 299 {
		fmt.Println("Unexpected error!")
	} else {
		fileName := path.Join(LOCAL_FOLDER, output_name)
		f, _ := os.Create(fileName)
		_, _ = f.Write(result_data)
		fmt.Println("File '" + fileName + "'successfully downloaded.")
	}
}

func changeDocumentPasswords(pdf_api *asposepdfcloud.PdfApiService, document string, output_document string, ownerPassword string, newUserPassword string, newOwnerPassword string, remote_folder string) {
	uploadFile(pdf_api, document)

	args := map[string]interface{}{
		"folder": remote_folder,
	}

	result, httpResponse, err := pdf_api.PostChangePasswordDocumentInStorage(document,
		base64.StdEncoding.EncodeToString([]byte(ownerPassword)),
		base64.StdEncoding.EncodeToString([]byte(newUserPassword)),
		base64.StdEncoding.EncodeToString([]byte(newOwnerPassword)),
		args)
	if err != nil {
		fmt.Println(err.Error())
	} else if httpResponse.StatusCode < 200 || httpResponse.StatusCode > 299 {
		fmt.Println("Unexpected error!")
	} else {
		fmt.Println(result)

		downloadFile(pdf_api, document, output_document)
	}
}