eu.europa.esig.dss.spi.policy.DefaultSignaturePolicyValidatorLoader Maven / Gradle / Ivy
/**
* DSS - Digital Signature Services
* Copyright (C) 2015 European Commission, provided under the CEF programme
*
* This file is part of the "DSS - Digital Signature Services" project.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package eu.europa.esig.dss.spi.policy;
import eu.europa.esig.dss.model.signature.SignaturePolicy;
import java.util.Iterator;
import java.util.ServiceLoader;
/**
* Loads a relevant {@code SignaturePolicyValidator} based on the policy content
*
*/
public class DefaultSignaturePolicyValidatorLoader implements SignaturePolicyValidatorLoader {
/**
* The validator to be used when only a basic validation according to the signature format is required
*
* NOTE: can be null (the best corresponding validator will be loaded)
*/
private SignaturePolicyValidator defaultSignaturePolicyValidator;
/**
* Default constructor instantiating object with null SignaturePolicyValidator
*/
public DefaultSignaturePolicyValidatorLoader() {
// empty
}
/**
* This method sets a {@code SignaturePolicyValidator} to be used for default signature policy processing
* according to the signature format (when {@code SignaturePolicy.hashAsInTechnicalSpecification == false})
*
* @param defaultSignaturePolicyValidator {@link SignaturePolicyValidator}
*/
public void setDefaultSignaturePolicyValidator(SignaturePolicyValidator defaultSignaturePolicyValidator) {
this.defaultSignaturePolicyValidator = defaultSignaturePolicyValidator;
}
/**
* Loads with a ServiceLoader and returns the relevant validator for a {@code SignaturePolicy}
*
* @param signaturePolicy {@link SignaturePolicy} to get a relevant validator for
* @return {@link SignaturePolicyValidator}
*/
@Override
public SignaturePolicyValidator loadValidator(final SignaturePolicy signaturePolicy) {
SignaturePolicyValidator validator = null;
if (defaultSignaturePolicyValidator != null && !signaturePolicy.isHashAsInTechnicalSpecification()) {
validator = defaultSignaturePolicyValidator;
} else {
ServiceLoader loader = ServiceLoader.load(SignaturePolicyValidator.class);
Iterator validatorOptions = loader.iterator();
if (validatorOptions.hasNext()) {
for (SignaturePolicyValidator signaturePolicyValidator : loader) {
if (signaturePolicyValidator.canValidate(signaturePolicy)) {
validator = signaturePolicyValidator;
break;
}
}
}
if (validator == null) {
// if not empty and no other implementation is found for ASN1 signature policies
validator = new BasicASN1SignaturePolicyValidator();
}
}
return validator;
}
}