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Validate the token signature and expiration date before sending the API call to the target backend

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/*
 * Copyright © 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.policy.v3.jwt.processor;

import com.nimbusds.jose.jwk.source.JWKSource;
import com.nimbusds.jose.proc.JWSKeySelector;
import com.nimbusds.jose.proc.SecurityContext;
import com.nimbusds.jwt.JWTClaimsSet;
import com.nimbusds.jwt.proc.ConfigurableJWTProcessor;
import com.nimbusds.jwt.proc.DefaultJWTClaimsVerifier;
import com.nimbusds.jwt.proc.DefaultJWTProcessor;
import io.gravitee.policy.jwt.alg.Signature;
import io.gravitee.policy.v3.jwt.exceptions.InvalidTokenException;
import io.gravitee.policy.v3.jwt.jwks.JWKSourceResolver;
import java.util.concurrent.CompletableFuture;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public abstract class AbstractKeyProcessor implements KeyProcessor {

    private JWKSourceResolver jwkSourceResolver;

    private static final DefaultJWTClaimsVerifier claimsVerifier = new DefaultJWTClaimsVerifier<>();

    // To ensure compatibility with previous version of JWT policy.
    // TODO: should be configurable from policy configuration.
    static {
        claimsVerifier.setMaxClockSkew(0);
    }

    @Override
    public CompletableFuture process(Signature signature, String token) {
        return jwkSourceResolver
            .resolve()
            .thenCompose(jwkSource -> {
                ConfigurableJWTProcessor jwtProcessor = new DefaultJWTProcessor<>();
                jwtProcessor.setJWTClaimsSetVerifier(claimsVerifier);
                jwtProcessor.setJWSKeySelector(jwsKeySelector(jwkSource, signature));

                try {
                    return CompletableFuture.completedFuture(jwtProcessor.process(token, null));
                } catch (Exception ex) {
                    throw new InvalidTokenException(ex);
                }
            });
    }

    public void setJwkSourceResolver(JWKSourceResolver jwkSourceResolver) {
        this.jwkSourceResolver = jwkSourceResolver;
    }

    abstract JWSKeySelector jwsKeySelector(JWKSource jwkSource, Signature signature);
}