/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare (INFN). 2006-2016
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.glite.security.voms.admin.service;

import java.util.regex.Pattern;

import org.glite.security.voms.User;

public class Validator {

  public static final String VALID_INPUT_PATTERN = "^[^<>&=]*$";
  public static final String VALID_DN_PATTERN = "^[^<>&]*$";

  public static final Pattern inputPattern = Pattern
    .compile(VALID_INPUT_PATTERN);
  public static final Pattern dnPattern = Pattern.compile(VALID_DN_PATTERN);

  public static void validateInputString(String inputString, String errorMessage) {

    assert inputString != null : "Cannot validate a null input string!";

    if (!inputPattern.matcher(inputString).matches())
      throw new IllegalArgumentException(errorMessage);

  }

  public static void validateDN(String dnString, String errorMessage) {

    assert dnString != null : "Cannot validate a null input string!";

    if (!dnPattern.matcher(dnString).matches())
      throw new IllegalArgumentException(errorMessage);

  }

  public static void validateUser(User u) {

    validateDN(u.getDN(), "Invalid characters in user's DN!");
    if (u.getCN() != null)
      validateDN(u.getCN(), "Invalid characters in user's CN!");
    if (u.getMail() != null)
      validateDN(u.getMail(), "Invalid characters in user's EMAIL!");
  }
}