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The jose.4.j library is a robust and easy to use open source implementation of JSON Web Token (JWT) and the JOSE specification suite (JWS, JWE, and JWK). It is written in Java and relies solely on the JCA APIs for cryptography. Please see https://bitbucket.org/b_c/jose4j/wiki/Home for more info, examples, etc..

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/*
 * Copyright 2012-2017 Brian Campbell
 *
 * 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.jose4j.jwt.consumer;

import org.jose4j.jwt.MalformedClaimException;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

/**
 *
 */
public class IssValidator implements Validator
{
    private Set expectedIssuers;
    private boolean requireIssuer;

    public IssValidator(String expectedIssuer, boolean requireIssuer)
    {
        if (expectedIssuer != null)
        {
            this.expectedIssuers = Collections.singleton(expectedIssuer);
        }
        this.requireIssuer = requireIssuer;
    }

    public IssValidator(boolean requireIssuer, String... expectedIssuers)
    {
        this.requireIssuer = requireIssuer;
        if (expectedIssuers != null && expectedIssuers.length > 0)
        {
            this.expectedIssuers = new HashSet<>();
            Collections.addAll(this.expectedIssuers, expectedIssuers);
        }
    }

    @Override
    public String validate(JwtContext jwtContext) throws MalformedClaimException
    {
        String issuer = jwtContext.getJwtClaims().getIssuer();

        if (issuer == null)
        {
            return requireIssuer ? "No Issuer (iss) claim present but was expecting " + expectedValue() : null;
        }

        if (expectedIssuers != null && !expectedIssuers.contains(issuer))
        {
            return "Issuer (iss) claim value (" + issuer + ") doesn't match expected value of " + expectedValue();
        }

        return null;
    }

    private String expectedValue()
    {
        return expectedIssuers.size() == 1 ? expectedIssuers.iterator().next() : "one of " + expectedIssuers;
    }
}