在Node.js SDK中向PDF添加图像印章

    import credentials from "./credentials.json"  with { type: "json" };
    import fs from 'node:fs/promises';
    import path from 'node:path';
    import { PdfApi } from "asposepdfcloud";
    import { Stamp } from "asposepdfcloud/src/models/stamp.js"; 

    const configParams = {
        LOCAL_FOLDER: "C:\\Samples\\",
        PDF_DOCUMENT_NAME: "sample.pdf",
        IMAGE_STAMP_FILE: "sample.png",
        LOCAL_RESULT_DOCUMENT_NAME: "output_sample.pdf",
        PAGE_NUMBER: 2,     // Your document page number...
        IMAGE_STAMP_LLY: 800,
        IMAGE_STAMP_WIDTH: 24,
        IMAGE_STAMP_HEIGHT: 24,
    };

    const pdfApi = new PdfApi(credentials.id, credentials.key);

    const pdfPages = {
        async uploadFile (fileName) {
            const fileNamePath = path.join(configParams.LOCAL_FOLDER, fileName);
            const pdfFileData = await fs.readFile(fileNamePath);
            await pdfApi.uploadFile(fileName, pdfFileData);
        },
                        
        async downloadResult () {
            const changedPdfData = await pdfApi.downloadFile(configParams.PDF_DOCUMENT_NAME);
            const filePath = path.join(configParams.LOCAL_FOLDER, configParams.LOCAL_RESULT_DOCUMENT_NAME);
            await fs.writeFile(filePath, changedPdfData.body);
            console.log("Downloaded: " + filePath);
        },

        async uploadDocument () {
            await this.uploadFile(configParams.PDF_DOCUMENT_NAME);
        },

        async addPageImageStamp () {
            const pageStamp = new Stamp();
            pageStamp.type = "Image";
            pageStamp.background = true;
            pageStamp.horizontalAlignment = "Center";
            pageStamp.textAlignment = "Center";
            pageStamp.value = "NEW TEXT STAMP";
            pageStamp.pageIndex = configParams.PAGE_NUMBER;
            pageStamp.fileName = configParams.IMAGE_STAMP_FILE;
            pageStamp.yIndent = configParams.IMAGE_STAMP_LLY;
            pageStamp.width = configParams.IMAGE_STAMP_WIDTH;
            pageStamp.height = configParams.IMAGE_STAMP_HEIGHT;
            
            const resultPages = await pdfApi.putPageAddStamp(configParams.PDF_DOCUMENT_NAME, configParams.PAGE_NUMBER, pageStamp);

            if (resultPages.body.code == 200) {
                console.log("Image Stamp added!");
                return true;
            }
            else
                console.error("Unexpected error : can't get pages!!!");
        },
    }

    async function main() {
        try {
            await pdfPages.uploadDocument();
            await pdfPages.uploadFile(configParams.IMAGE_STAMP_FILE);
            await pdfPages.addPageImageStamp();
            await pdfPages.downloadResult();
        } catch (error) {
            console.error("Error:", error.message);
        }
    }