einv-demo-invoice-api/nodejs/main.js

var https = require("https");
var jsrsasign = require('jsrsasign');
var urlencode = require('urlencode');

// 签名使用的私钥（瑞宏网提供）
var privateKeyPem = "请向瑞宏网工作人员索取";
// 销售方纳税人识别号
var taxpayerCode = "请向瑞宏网工作人员索取";

/**
* 生成签名
* @param privateKeyPem 签名使用的私钥（瑞宏网提供）
* @param digestString 需要签名的字符串
*/
var getSign = function(privateKeyPem, digestString) {
    var prvKey = jsrsasign.KEYUTIL.getKeyFromPlainPrivatePKCS8PEM("-----BEGIN PRIVATE KEY-----" + privateKeyPem);
    var sig = new jsrsasign.KJUR.crypto.Signature({"alg": "MD5withRSA"});
    sig.init(prvKey);  // 设置key
    var signHex = sig.signString(digestString);  // 签名
    return jsrsasign.hex2b64(signHex);  // 得到签名Hex，并转成base64string
};

// 请求数据
var requestData = {
  serialNo: "15244572079331206",
  postTime: "2017-11-01 09:42:00",
  order: {
    account: ".",
    address: ".",
    email: "test@chinaeinv.cn",
    tel: "18600000000",
    orderNo: "zbss000000002"
  },
  invoice: {
    taxpayerCode: taxpayerCode,
    customerName: "abc",
    customerCode: "370212350288104",
    drawer: "abc",
    totalAmount: "0.01",
    customerAddress: "abc",
    customerTel: "12345678",
    customerBankName: "abc",
    customerBankAccount: "984484121854121",
    payee: "abc",
    reviewer: "abc",
    items: [
      {
        amount: "0.01",
        code: "zbss00000000101",
        name: "abc",
        price: "0.01",
        quantity: "1",
        taxRate: "0.17",
        uom: "abc",
        type: "0",
        spec: "abc",
        catalogCode: "1020202000000000000"
      }
    ]
  },
  notices: [
    {
      type: "email",
      value: "hongpujun@chinaeinv.cn"
    },
    {
      type: "sms",
      value: "18660243735"
    }
  ]
};

// 请求数据的字符串格式
var requestString = JSON.stringify(requestData);

// 签名字符串
var sign = getSign(privateKeyPem, requestString);

// http请求参数
var options = {
    host: 'www.chinaeinv.com', // 瑞宏网域名
    port: 943,                 // 瑞宏网端口（测试环境：943，生产环境：443）
    path: '/igs/api/invoiceApi.jspa?appCode=PTTEST13&cmdName=chinaeinv.api.invoice.v3.kp_async&sign=' + urlencode(urlencode(sign)), // 注意签名字段需要要两次urlencode，以避免加号变空格
    method:'POST',
    headers:{
        'Content-Type': 'application/json',
        'Content-Length': Buffer.byteLength(requestString)
    }
}

// 发送 HTTPS POST 请求
var req = https.request(options, function(res) {
    console.log("请求报文: ", requestString);
    console.log("签名:", sign);
    console.log("statusCode: ", res.statusCode);
    var _data='';
    res.on('data', function(chunk){
        _data += chunk;
    });
    res.on('end', function(){
        console.log("响应报文:",_data)
    });
});
req.write(requestString);
req.end;