ValidBase64Validator.java example

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keywhiz-master
/*
 * Copyright (C) 2015 Square, 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 keywhiz.api.validation;

import java.util.Base64;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/** Validates that a string is base64 encoded. */
public class ValidBase64Validator implements ConstraintValidator<ValidBase64, String> {
  @Override public void initialize(ValidBase64 constraintAnnotation) {}

  @Override public boolean isValid(String value, ConstraintValidatorContext ctx) {
    try {
      if (value != null) {
        Base64.getDecoder().decode(value);
      }
    } catch (IllegalArgumentException ignored) {
      return false;
    }

    return true;
  }
}