在 Node.js SDK 中删除 PDF 元数据

    import credentials from "./credentials.json"  with { type: "json" };
    import fs from 'node:fs/promises';
    import path from 'node:path';
    import { PdfApi } from "asposepdfcloud";
    import { XmpMetadata } from "asposepdfcloud/src/models/xmpMetadata.js";
    import { XmpMetadataProperty } from "asposepdfcloud/src/models/xmpMetadataProperty.js";

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

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

    const pdfMetadatas = {
        async uploadDocument() {
            const pdfFilePath = path.join(configParams.LOCAL_FOLDER, configParams.PDF_DOCUMENT_NAME);
            const pdfFileData = await fs.readFile(pdfFilePath);
            await pdfApi.uploadFile(configParams.PDF_DOCUMENT_NAME, 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 getMetadata () {
            const responseMetadata = await pdfApi.getXmpMetadataJson(configParams.PDF_DOCUMENT_NAME);

            if (responseMetadata.response.status == 200)
            {
                const props = responseMetadata.body.properties;
                props.forEach((prop) =>{
                    console.log(prop.key);
                });
            }
        },

        async deleteMetadata () {
            const prop = new XmpMetadataProperty();
            prop.key = 'dc:creator';
            prop.value = null;        // null value means delete property...
            prop.namespaceUri = 'http://purl.org/dc/elements/1.1/';

            const metadata = new XmpMetadata();
            metadata.properties = [prop];
            
            const response = await pdfApi.postXmpMetadata(configParams.PDF_DOCUMENT_NAME, metadata);

            if (response.body.code == 200) {
                console.log("Delete metadata '" + prop.key + "' successful!");
                return true;
            }
        },
    }

    async function main() {
        try {
            await pdfMetadatas.uploadDocument();
            await pdfMetadatas.getMetadata();
            await pdfMetadatas.deleteMetadata();
            await pdfMetadatas.getMetadata();
            await pdfMetadatas.downloadResult();
        } catch (error) {
            console.error("Error:", error.message);
        }
    }