public AnubisAuthentication authenticate()

in library/src/main/java/org/apache/fineract/cn/anubis/security/SystemAuthenticator.java [63:103]
35 lines of code
6 McCabe index (conditional complexity)

  public AnubisAuthentication authenticate(
      final String user,
      final String token,
      final String keyTimestamp) {
    if (!user.equals(ApiConstants.SYSTEM_SU))
      throw AmitAuthenticationException.invalidHeader();

    try {
      final JwtParser jwtParser = Jwts.parser()
          .setSigningKey(systemRsaKeyProvider.getPublicKey(keyTimestamp))
          .requireIssuer(TokenType.SYSTEM.getIssuer())
          .require(TokenConstants.JWT_SIGNATURE_TIMESTAMP_CLAIM, keyTimestamp);

      TenantContextHolder.identifier().ifPresent(jwtParser::requireSubject);

      //noinspection unchecked
      final Jwt<Header, Claims> result = jwtParser.parse(token);
      if (result.getBody() == null ||
              result.getBody().getAudience() == null) {
        logger.info("System token for user {}, with key timestamp {} failed to authenticate. Audience was not set.", user, keyTimestamp);
        throw AmitAuthenticationException.invalidToken();
      }

      logger.info("System token for user {}, with key timestamp {} authenticated successfully.", user, keyTimestamp);

      return new AnubisAuthentication(
              TokenConstants.PREFIX + token,
              user,
              result.getBody().getAudience(),
              TokenType.SYSTEM.getIssuer(),
              permissions);
    }
    catch (final JwtException e) {
      logger.debug("token = {}", token);
      logger.info("System token for user {}, with key timestamp {} failed to authenticate. Exception was {}", user, keyTimestamp, e.getMessage());
      throw AmitAuthenticationException.invalidToken();
    } catch (final InvalidKeyTimestampException e) {
      logger.info("System token for user {}, with key timestamp {} failed to authenticate. Exception was {}", user, keyTimestamp, e.getMessage());
      throw AmitAuthenticationException.invalidTokenKeyTimestamp("system", keyTimestamp);
    }
  }