com.vmware.photon.controller.api.model.constraints.CidrValidator.java Source code

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Here is the source code for com.vmware.photon.controller.api.model.constraints.CidrValidator.java

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/*
 * Copyright 2015 VMware, Inc. All Rights Reserved.
 *
 * 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.vmware.photon.controller.api.model.constraints;

import com.google.inject.Inject;
import org.apache.commons.validator.routines.InetAddressValidator;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * Validates if the given string is a valid CIDR.
 */
public class CidrValidator implements ConstraintValidator<Cidr, String> {

    public static final int CIDR_BIT_MASK_MAX_VALUE = 31;

    @Inject
    public CidrValidator() {
    }

    @Override
    public void initialize(Cidr constraintAnnotation) {
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (value == null) {
            return false;
        }

        int bitMask = 0;
        boolean validIpAddress = false;
        String[] cidr = value.split("/");

        if (cidr.length == 2 && cidr[1].matches("\\d+")) {
            validIpAddress = InetAddressValidator.getInstance().isValid(cidr[0]);
            bitMask = Integer.parseInt(cidr[1]);
        }

        if (!validIpAddress || !(bitMask > 0 && bitMask <= CIDR_BIT_MASK_MAX_VALUE)) {
            context.disableDefaultConstraintViolation();
            context.buildConstraintViolationWithTemplate(String.format("%s is invalid CIDR", value))
                    .addConstraintViolation();
            return false;
        }

        return true;
    }
}