在 Node.js 云 API 中压缩 PDF

    import credentials from "../../../Credentials/credentials.json"  with { type: "json" };    // json-file in this format: { "id": "*****", "key": "*******" }
    import fs from 'node:fs/promises';
    import path from 'node:path';
    import { PdfApi } from "../../src/api/api.js";
    import { OptimizeOptions } from "../../src/models/optimizeOptions.js";

    const configParams = {
        LOCAL_FOLDER: "C:\\Samples\\",
        PDF_DOCUMENT_NAME: "sample.pdf",
        TEMP_FOLDER : 'TempPdfCloud',
        LOCAL_RESULT_DOCUMENT_NAME: "output_sample.pdf",
    };

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

    const PdfCompress = {
        async uploadDocument (fileName, localFolder) {
            const fileNamePath = path.join(configParams.LOCAL_FOLDER, configParams.PDF_DOCUMENT_NAME);
            const fileData = await fs.readFile(fileNamePath);
            const storagePath = path.join(configParams.TEMP_FOLDER, configParams.PDF_DOCUMENT_NAME);
            await pdfApi.uploadFile(storagePath, fileData)
                .then(() => console.log("File: '" + configParams.PDF_DOCUMENT_NAME +"' successfully uploaded."));
        },

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

        async compressPdfDocument() {
            if ( pdfApi ) {

                const optimizeOptions = new OptimizeOptions();
                optimizeOptions.allowReusePageContent = true;
                optimizeOptions.compressImages = true;
                optimizeOptions.imageQuality = 100;
                optimizeOptions.linkDuplcateStreams = true;
                optimizeOptions.removeUnusedObjects = true;
                optimizeOptions.removeUnusedStreams = true;            
                optimizeOptions.unembedFonts = true;
    
                const response = await pdfApi.postOptimizeDocument(configParams.PDF_DOCUMENT_NAME, optimizeOptions, null, configParams.TEMP_FOLDER);
                if (response.body.code != 200)
                    console.error("compressPdfDocument(): Failed to compress the PDF document!");
                else
                    console.log("compressPdfDocument(): Successfully copressed the PDF document '" + configParams.PDF_DOCUMENT_NAME + "' !");
            }
        },
    };

    async function main() {
        try {
            await PdfCompress.uploadDocument();
            await PdfCompress.compressPdfDocument();
            await PdfCompress.downloadResult();

        } catch (error) {
            console.error("Error:", error.message);
        }
    }