@sap/hdbext/lib/conn-options.js

Hana-client extension library and utility functions for using SAP HANA in node.js

'use strict';

var AcceptLanguageParser = require('accept-language');
var fs = require('fs');
var os = require('os');
var SAPPassport = require('@sap/e2e-trace').Passport;
var internalConsts = require('./internal-constants');
var debug = require('debug')('hdbext:conn-options');

exports.getGlobalOptions = getGlobalOptions;
exports.getRequestOptions = getRequestOptions;

function getRequestOptions(req) {
  var opt = {};

  var authInfo = req.authInfo;

  if (authInfo && authInfo.getGrantType && authInfo.getGrantType() !== internalConsts.GRANTTYPE_CLIENTCREDENTIAL) {
    if (authInfo.getHdbToken) {
      opt['sessionVariable:XS_APPLICATIONUSER'] = authInfo.getHdbToken();
    } else if (authInfo.getToken) {
      opt['sessionVariable:XS_APPLICATIONUSER'] = authInfo.getToken(internalConsts.SYSTEM, internalConsts.HDB);
    }
  }

  if (req.headers[SAPPassport.HEADER_NAME]) {
    var passport = new SAPPassport(req.headers[SAPPassport.HEADER_NAME]);
    passport.update({
      connectionID: '00000000000000000000000000000000',
      connectionCounter: 0
    });
    passport.compact();
    opt['sessionVariable:SAP_PASSPORT'] = passport.serialize();
  }

  var reqLang = resolveRequestLanguage(req);
  if (reqLang) {
    opt.locale = reqLang;
  }

  return opt;
}

function resolveRequestLanguage(req) {
  var sapLang = req.headers['x-sap-request-language'];
  if (sapLang) {
    return sapLang;
  }

  var acceptLanguage = req.headers['accept-language'];
  if (acceptLanguage) {
    // accept-language 3.X would need to set first a list of languages
    // an alternative could be using accept-language-parser package
    var languagesByPreference = AcceptLanguageParser.parse(acceptLanguage);
    if (languagesByPreference.length) {
      return languagesByPreference[0].value;
    }
  }
}

function getGlobalOptions() {
  var opt = { 'sessionVariable:APPLICATION': getApplicationName() };

  var appVersion = getApplicationVersion();
  if (appVersion) {
    opt['sessionVariable:APPLICATIONVERSION'] = appVersion;
  }

  return opt;
}

function getApplicationName() {
  if (process.env.VCAP_APPLICATION) {
    var app = JSON.parse(process.env.VCAP_APPLICATION);
    var components = [app.application_name, app.space_name, app.organization_name]
      .filter(Boolean);
    if (components.length > 0) {
      return components.join('/');
    }
  }
  return process.pid + '@' + os.hostname();
}

function getApplicationVersion() {
  try {
    var pkg = JSON.parse(fs.readFileSync('./package.json', 'utf8'));
    return pkg.name + '@' + pkg.version;
  } catch (err) {
    debug(err);
  }
}