index.ts

import * as mod from 'libxml-xsd';
import * as path from 'path';

const xsd = 'saml-schema-protocol-2.0.xsd';

export const validate = (xml: string) => {
  return new Promise((resolve, reject) => {
    // https://github.com/albanm/node-libxml-xsd/issues/11
    process.chdir(path.resolve(__dirname, '../schemas'));
    mod.parseFile(path.resolve(xsd), (err, schema) => {
      if (err) {
        console.error('[ERROR] validateXML', err);
        return reject('ERR_INVALID_XML');
      }
      schema.validate(xml, (techErrors, validationErrors) => {
        if (techErrors !== null || validationErrors !== null) {
          console.error(`this is not a valid saml response with errors: ${validationErrors}`);
          return reject('ERR_EXCEPTION_VALIDATE_XML');
        }
        return resolve('SUCCESS_VALIDATE_XML');
      });
    });
  });
};