de.intarsys.pdf.crypt.AccessPermissionsTools Maven / Gradle / Ivy

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package de.intarsys.pdf.crypt;

import de.intarsys.pdf.cos.COSDictionary;
import de.intarsys.pdf.cos.COSObject;
import de.intarsys.pdf.pd.PDDocument;
import de.intarsys.pdf.pd.PDSignature;
import de.intarsys.pdf.pd.PDSignatureReference;
import de.intarsys.pdf.pd.PDTransformMethod;
import de.intarsys.pdf.pd.PDTransformMethodDocMDP;

import java.util.Iterator;
import java.util.List;

public class AccessPermissionsTools {

    private AccessPermissionsTools() {
    }

    public static IAccessPermissions createPermissions(PDDocument doc) {
        IAccessPermissions delegate = doc.cosGetDoc().getAccessPermissions();
        COSDictionary perms = doc.cosGetPermissionsDict();
        if (perms != null) {
            COSObject cosDocMDPSig = perms.get(PDTransformMethod.DK_DocMDP);
            if (!cosDocMDPSig.isNull()) {
                PDSignature sig = (PDSignature) PDSignature.META.createFromCos(cosDocMDPSig);
                List references = sig.getSignatureReferences();
                for (Iterator i = references.iterator(); i.hasNext(); ) {
                    PDSignatureReference reference = (PDSignatureReference) i.next();
                    if (reference.getTransformMethod() == PDTransformMethodDocMDP.SINGLETON) {
                        return new AccessPermissionsDocMDP(delegate, reference.getTransformParams());
                    }
                }
            }
        }
        return delegate;
    }
}