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Provides lightweight Java implementations of the HOTP and TOTP multi-factor authentication specification.

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/*
 * Copyright 2016 Johannes Donath 
 * and other copyright owners as documented in the project's IP log.
 *
 * 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 com.torchmind.authenticator;

import edu.umd.cs.findbugs.annotations.NonNull;
import java.time.Duration;

/**
 * @author Johannes Donath
 */
class TokenGeneratorBuilder implements TokenGenerator.Builder {

  private TokenGenerator.Algorithm algorithm = TokenGenerator.Algorithm.SHA1;
  private int digits = 6;
  private Duration period = Duration.ofSeconds(30);

  /**
   * {@inheritDoc}
   */
  @NonNull
  @Override
  public TokenGenerator.Algorithm algorithm() {
    return this.algorithm;
  }

  /**
   * {@inheritDoc}
   */
  @NonNull
  @Override
  public TokenGenerator.Builder algorithm(@NonNull TokenGenerator.Algorithm algorithm) {
    this.algorithm = algorithm;
    return this;
  }

  /**
   * {@inheritDoc}
   */
  @NonNull
  @Override
  public CounterTokenGenerator createCounterGenerator(@NonNull String issuer) {
    return new CounterTokenGenerator(this.algorithm, this.digits, issuer);
  }

  /**
   * {@inheritDoc}
   */
  @NonNull
  @Override
  public PeriodTokenGenerator createPeriodGenerator(@NonNull String issuer) {
    return new PeriodTokenGenerator(this.algorithm, this.digits, issuer, this.period);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public int digits() {
    return this.digits;
  }

  /**
   * {@inheritDoc}
   */
  @NonNull
  @Override
  public TokenGenerator.Builder digits(int digits) {
    if (digits != 6 && digits != 8) {
      throw new IllegalArgumentException("Value must be either 6 or 8");
    }

    this.digits = digits;
    return this;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Duration period() {
    return this.period;
  }

  /**
   * {@inheritDoc}
   */
  @NonNull
  @Override
  public TokenGenerator.Builder period(@NonNull Duration period) {
    this.period = period;
    return this;
  }
}