TokenGenerator.java

/**
 * Copyright 2010 Google Inc.
 *
 * 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.waveprotocol.wave.model.id;

/**
 * Generator for random base64url encoded strings.
 *
 * @author ljvderijk@google.com (Lennard de Rijk)
 */
public interface TokenGenerator {

  /**
   * Generates a pseudo-random string with the given length. The string will
   * only consist of characters from the base64url encoding. Each character
   * carries 6 bits of randomness.
   *
   * @param length the length of the string to return.
   */
  String generateToken(int length);
}