org.opensaml.xmlsec.signature.support.impl.ChainingSignaturePrevalidator.java Source code

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Here is the source code for org.opensaml.xmlsec.signature.support.impl.ChainingSignaturePrevalidator.java

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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID licenses this file to You 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.opensaml.xmlsec.signature.support.impl;

import java.util.ArrayList;
import java.util.List;

import javax.annotation.Nonnull;

import net.shibboleth.utilities.java.support.annotation.constraint.NonnullElements;
import net.shibboleth.utilities.java.support.logic.Constraint;

import org.opensaml.xmlsec.signature.Signature;
import org.opensaml.xmlsec.signature.support.SignatureException;
import org.opensaml.xmlsec.signature.support.SignaturePrevalidator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Predicates;
import com.google.common.collect.Collections2;

/**
 * A signature prevalidator implementation which chains execution of a list of {@link SignaturePrevalidator} instances.
 */
public class ChainingSignaturePrevalidator implements SignaturePrevalidator {

    /** Logger. */
    @Nonnull
    private Logger log = LoggerFactory.getLogger(ChainingSignaturePrevalidator.class);

    /** The chain of SignaturePrevalidator instances to execute. */
    @Nonnull
    @NonnullElements
    private List<SignaturePrevalidator> validators;

    /**
     * Constructor.
     *
     * @param validatorChain the chain of SignaturePrevalidator instances to execute
     */
    public ChainingSignaturePrevalidator(
            @Nonnull @NonnullElements final List<SignaturePrevalidator> validatorChain) {
        Constraint.isNotNull(validatorChain, "SignaturePrevalidator list cannot be null");
        validators = new ArrayList<>(Collections2.filter(validatorChain, Predicates.notNull()));
    }

    /** {@inheritDoc} */
    @Override
    public void validate(@Nonnull final Signature signature) throws SignatureException {
        for (final SignaturePrevalidator validator : validators) {
            log.debug("Validating signature using prevalidator: {}", validator.getClass().getName());
            validator.validate(signature);
        }

    }

}