/*
* Copyright 2006-2017 ICEsoft Technologies Canada Corp.
*
* 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.icepdf.core.pobjects;
import org.icepdf.core.pobjects.acroform.SignatureDictionary;
import org.icepdf.core.util.Library;
import java.util.HashMap;
/**
* The Perms entry in the document catalogue (see Table 28) shall specify a permissions dictionary (PDF 1.5). Each entry
* in this dictionary (see Table 258 for the currently defined entries) shall specify the name of a permission handler
* that controls access permissions for the document. These permissions are similar to those defined by security handlers
* (see Table 22) but do not require that the document be encrypted. For a permission to be actually granted for a
* document, it shall be allowed by each permission handler that is present in the permissions dictionary as well as
* by the security handler.
*/
public class Permissions extends Dictionary {
/**
* This dictionary shall contain a Reference entry that shall be a signature reference dictionary (see Table 252)
* that has a DocMDP transform method (see 12.8.2.2, DocMDP) and corresponding transform parameters.
* <br>
* If this entry is present, consumer applications shall enforce the permissions specified by the P attribute in
* the DocMDP transform parameters dictionary and shall also validate the corresponding signature based on whether
* any of these permissions have been violated.
*/
public static final Name DOC_MDP_KEY = new Name("DocMDP");
/**
* (Optional) A signature dictionary that shall be used to specify and validate additional capabilities (usage rights)
* granted for this document; that is, the enabling of interactive features of the conforming reader that are not
* available by default.
* <br>
* For example, A conforming reader does not permit saving documents by default, but an agent may grant permissions
* that enable saving specific documents. The signature shall be used to validate that the permissions have been
* granted by the agent that did the signing.
* <br>
* The signature dictionary shall contain a Reference entry that shall be a signature reference dictionary that has
* a UR transform method (see 12.8.2.3, UR). The transform parameter dictionary for this method indicates which
* additional permissions shall be granted for the document. If the signature is valid, the conforming reader shall
* allow the specified permissions for the document, in addition to the application's default permissions.
*/
public static final Name UR3_KEY = new Name("UR3");
// todo need to find some info this key
public static final Name UR_KEY = new Name("UR");
public Permissions(Library library, HashMap entries) {
super(library, entries);
}
/**
* Indication if DocMDP handler should be used.
*
* @return true if DocMDP handler should be used.
*/
public boolean isDocMDP() {
return library.getObject(entries, DOC_MDP_KEY) != null;
}
/**
* Indication if UR3 handler should be used.
*
* @return true if UR3 handler should be used.
*/
public boolean isUR3() {
return library.getObject(entries, UR3_KEY) != null;
}
/**
* Indication if UR3 handler should be used.
*
* @return true if UR3 handler should be used.
*/
public boolean isUR() {
return library.getObject(entries, UR_KEY) != null;
}
public SignatureDictionary getSignatureDictionary() {
if (isDocMDP()) {
return new SignatureDictionary(library, library.getDictionary(entries, DOC_MDP_KEY));
} else if (isUR3()) {
return new SignatureDictionary(library, library.getDictionary(entries, UR3_KEY));
} else if (isUR()) {
return new SignatureDictionary(library, library.getDictionary(entries, UR_KEY));
} else {
return null;
}
}
}