library/src/main/java/org/apache/fineract/cn/anubis/security/FinKeycloakAuthenticationProvider.java [112:123]:
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    private Optional<String> getJwtTokenString(final String authenticationHeader) {
        if ((authenticationHeader == null) || authenticationHeader.equals(
                TokenConstants.NO_AUTHENTICATION)){
            return Optional.empty();
        }

        if (!authenticationHeader.startsWith(TokenConstants.PREFIX)) {
            logger.debug("Authentication failed for a token which does not begin with the token prefix.");
            throw AmitAuthenticationException.invalidHeader();
        }
        return Optional.of(authenticationHeader.substring(TokenConstants.PREFIX.length()).trim());
    }
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library/src/main/java/org/apache/fineract/cn/anubis/security/IsisAuthenticatedAuthenticationProvider.java [111:122]:
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  private Optional<String> getJwtTokenString(final String authenticationHeader) {
    if ((authenticationHeader == null) || authenticationHeader.equals(
        TokenConstants.NO_AUTHENTICATION)){
      return Optional.empty();
    }

    if (!authenticationHeader.startsWith(TokenConstants.PREFIX)) {
      logger.debug("Authentication failed for a token which does not begin with the token prefix.");
      throw AmitAuthenticationException.invalidHeader();
    }
    return Optional.of(authenticationHeader.substring(TokenConstants.PREFIX.length()).trim());
  }
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