在 Node.js SDK 中替换 PDF 中的签名

    import credentials from "../../../Credentials/credentials.json"  with { type: "json" };
    import fs from 'node:fs/promises';
    import path from 'node:path';
    import { PdfApi } from "../../src/api/api.js";
    import {Signature} from "../../src/models/signature.js";
    import {SignatureType} from "../../src/models/signatureType.js";
    import {SignatureField} from "../../src/models/signatureField.js";

    const configParams = {
        LOCAL_FOLDER: "C:\\Samples\\",
        PDF_DOCUMENT_NAME: "sample.pdf",
        LOCAL_RESULT_DOCUMENT_NAME: "output_sample.pdf",
        LOCAL_SIGNATURE_PATH: "C:\\Samples\\Signatures\\3",
        SIGNATURE_PFX: "signature.pfx",
        SIGNATURE_FORM_FIELD: 'Signature_1',
        SIGNATURE_PASSWORD: 'Password',
        SIGNATURE_CONTACT: 'Contact',
        SIGNATURE_LOCATION: 'Location',
        SIGNATURE_AUTHORITY: 'Issuer',
        SIGNATURE_DATE: '04/19/2025 12:15:00.000 PM',
        SIGNATURE_RECT:  { lLx: 100, lLy: 100, uRx: 500, uRy: 500 }
    };

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

    const pdfSignatures = {
        async uploadFile (folder, fileName) {
            const fileNamePath = path.join(folder, fileName);
            const pdfFileData = await fs.readFile(fileNamePath);
            await pdfApi.uploadFile(fileName, pdfFileData);
            console.log("File '" + fileName + "' successfully uploaded!");
        },

        async uploadDocument () {
            await this.uploadFile(configParams.LOCAL_FOLDER, configParams.PDF_DOCUMENT_NAME);
        },
                        
        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 replaceSignature () {
            if (pdfApi)
            {  
                
                const signature = new Signature();
                signature.authority = configParams.SIGNATURE_AUTHORITY;
                signature.contact = configParams.SIGNATURE_CONTACT;
                signature.date = configParams.SIGNATURE_DATE;
                signature.formFieldName = configParams.SIGNATURE_FORM_FIELD;
                signature.location = configParams.SIGNATURE_LOCATION;
                signature.password = configParams.SIGNATURE_PASSWORD;
                signature.rectangle = configParams.SIGNATURE_RECT;
                signature.signaturePath = configParams.SIGNATURE_PFX;
                signature.signatureType = SignatureType.PKCS7;
                signature.visible = true;

                const field = new SignatureField();
                field.pageIndex = 1;
                field.signature = signature;
                field.partialName = 'sign1';
                field.rect = configParams.SIGNATURE_RECT;

                const response = await pdfApi.putSignatureField(configParams.PDF_DOCUMENT_NAME, configParams.SIGNATURE_FORM_FIELD, field);

                if (response.body.code == 200)
                    console.log("replaceSignature(): Signature '" + configParams.SIGNATURE_CONTACT + "' successfully replaced in the document.");
                else
                    console.error("replaceSignature(): Failed to replace signature in the document. Response code: " + response.body.code);
            }
        },
    }

    async function main() {
        try {
            await pdfSignatures.uploadFile(configParams.LOCAL_SIGNATURE_PATH, configParams.SIGNATURE_PFX);
            await pdfSignatures.uploadDocument();
            await pdfSignatures.replaceSignature();
            await pdfSignatures.downloadResult();
        } catch (error) {
            console.error("Error:", error.message);
        }
    }