validate-vat/lib/index.js

A Europe VAT number validation lib

// Generated by CoffeeScript 1.12.7
(function() {
  var ERROR_MSG, EU_COUNTRIES_CODES, exports, getReadableErrorMsg, headers, https, parseSoapResponse, parsedUrl, serviceUrl, soapBodyTemplate, url,
    indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };

  url = require('url');

  https = require('https');

  serviceUrl = 'https://ec.europa.eu/taxation_customs/vies/services/checkVatService';

  parsedUrl = url.parse(serviceUrl);

  soapBodyTemplate = '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"\n  xmlns:tns1="urn:ec.europa.eu:taxud:vies:services:checkVat:types"\n  xmlns:impl="urn:ec.europa.eu:taxud:vies:services:checkVat">\n  <soap:Header>\n  </soap:Header>\n  <soap:Body>\n    <tns1:checkVat xmlns:tns1="urn:ec.europa.eu:taxud:vies:services:checkVat:types"\n     xmlns="urn:ec.europa.eu:taxud:vies:services:checkVat:types">\n     <tns1:countryCode>_country_code_placeholder_</tns1:countryCode>\n     <tns1:vatNumber>_vat_number_placeholder_</tns1:vatNumber>\n    </tns1:checkVat>\n  </soap:Body>\n</soap:Envelope>';

  EU_COUNTRIES_CODES = ['AT', 'BE', 'BG', 'HR', 'CY', 'CZ', 'DK', 'EE', 'FI', 'FR', 'DE', 'EL', 'HU', 'IE', 'IT', 'LV', 'LT', 'LU', 'MT', 'NL', 'PL', 'PT', 'RO', 'SK', 'SI', 'ES', 'SE', 'XI'];

  ERROR_MSG = {
    'INVALID_INPUT': 'The provided CountryCode is invalid or the VAT number is empty',
    'SERVICE_UNAVAILABLE': 'The VIES VAT service is unavailable, please try again later',
    'MS_UNAVAILABLE': 'The VAT database of the requested member country is unavailable, please try again later',
    'MS_MAX_CONCURRENT_REQ': 'The VAT database of the requested member country has had too many requests, please try again later',
    'TIMEOUT': 'The request to VAT database of the requested member country has timed out, please try again later',
    'SERVER_BUSY': 'The service cannot process your request, please try again later',
    'UNKNOWN': 'Unknown error'
  };

  headers = {
    'Content-Type': 'text/xml; charset=utf-8',
    'User-Agent': 'node-soap',
    'Accept': 'text/html,application/xhtml+xml,application/xml,text/xml;q=0.9,*/*;q=0.8',
    'Accept-Encoding': 'none',
    'Accept-Charset': 'utf-8',
    'Connection': 'close',
    'Host': parsedUrl.hostname
  };

  getReadableErrorMsg = function(faultstring) {
    if (ERROR_MSG[faultstring] != null) {
      return ERROR_MSG[faultstring];
    } else {
      return ERROR_MSG['UNKNOWN'];
    }
  };

  parseSoapResponse = function(soapMessage) {
    var hasFault, parseField, ret;
    parseField = function(field) {
      var err, match, regex;
      regex = new RegExp("<" + field + ">\((\.|\\s)\*?\)</" + field + ">", 'gm');
      match = regex.exec(soapMessage);
      if (!match) {
        err = new Error("Failed to parseField " + field);
        err.soapMessage = soapMessage;
        throw err;
      }
      return match[1];
    };
    hasFault = soapMessage.match(/<env:Fault>\S+<\/env:Fault>/g);
    if (hasFault) {
      ret = {
        faultCode: parseField('faultcode'),
        faultString: parseField('faultstring')
      };
    } else {
      ret = {
        countryCode: parseField('ns2:countryCode'),
        vatNumber: parseField('ns2:vatNumber'),
        requestDate: parseField('ns2:requestDate'),
        valid: parseField('ns2:valid') === 'true',
        name: parseField('ns2:name'),
        address: parseField('ns2:address').replace(/\n/g, ', ')
      };
    }
    return ret;
  };

  module.exports = exports = function(countryCode, vatNumber, timeout, callback) {
    var options, req, xml;
    if (typeof countryCode === 'string') {
      countryCode = countryCode.toUpperCase();
    }
    if (typeof timeout === 'function') {
      callback = timeout;
      timeout = null;
    }
    if (indexOf.call(EU_COUNTRIES_CODES, countryCode) < 0 || !(vatNumber != null ? vatNumber.length : void 0)) {
      return process.nextTick(function() {
        return callback(new Error(ERROR_MSG['INVALID_INPUT']));
      });
    }
    xml = soapBodyTemplate.replace('_country_code_placeholder_', countryCode).replace('_vat_number_placeholder_', vatNumber).replace('\n', '').trim();
    headers['Content-Length'] = Buffer.byteLength(xml, 'utf8');
    options = {
      host: parsedUrl.host,
      method: 'POST',
      path: parsedUrl.path,
      headers: headers,
      family: 4
    };
    req = https.request(options, function(res) {
      var str;
      res.setEncoding('utf8');
      str = '';
      res.on('data', function(chunk) {
        return str += chunk;
      });
      return res.on('end', function() {
        var data, err, ref;
        try {
          data = parseSoapResponse(str);
        } catch (error) {
          err = error;
          return callback(err);
        }
        if ((ref = data.faultString) != null ? ref.length : void 0) {
          err = new Error(getReadableErrorMsg(data.faultString));
          err.code = data.faultCode;
          return callback(err);
        }
        return callback(null, data);
      });
    });
    if (timeout) {
      req.setTimeout(timeout, function() {
        return req.abort();
      });
    }
    req.on('error', callback);
    req.write(xml);
    return req.end();
  };

}).call(this);