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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.kernel.pdf.filespec;
import com.itextpdf.io.logs.IoLogMessageConstant;
import com.itextpdf.kernel.exceptions.PdfException;
import com.itextpdf.kernel.exceptions.KernelExceptionMessageConstant;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfEncryptedPayload;
import com.itextpdf.kernel.pdf.PdfName;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.InputStream;
public class PdfEncryptedPayloadFileSpecFactory {
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param fileStore byte[] containing encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @param mimeType mime-type of the file
* @param fileParameter Pdfdictionary containing file parameters
* @return PdfFileSpec containing the file specification of the encrypted payload
*/
public static PdfFileSpec create(PdfDocument doc, byte[] fileStore, PdfEncryptedPayload encryptedPayload, PdfName mimeType, PdfDictionary fileParameter) {
return addEncryptedPayloadDictionary(PdfFileSpec.createEmbeddedFileSpec(doc, fileStore, generateDescription(encryptedPayload), generateFileDisplay(encryptedPayload), mimeType, fileParameter, PdfName.EncryptedPayload), encryptedPayload);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param fileStore byte[] containing the file
* @param encryptedPayload the encrypted payload dictionary
* @param fileParameter Pdfdictionary containing file parameters
* @return PdfFileSpec containing the file specification of the encrypted payload
*/
public static PdfFileSpec create(PdfDocument doc, byte[] fileStore, PdfEncryptedPayload encryptedPayload, PdfDictionary fileParameter) {
return create(doc, fileStore, encryptedPayload, null, fileParameter);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param fileStore byte[] containing the file
* @param encryptedPayload the encrypted payload dictionary
* @return PdfFileSpec containing the file specification of the encrypted payload
*/
public static PdfFileSpec create(PdfDocument doc, byte[] fileStore, PdfEncryptedPayload encryptedPayload) {
return create(doc, fileStore, encryptedPayload, null, null);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param filePath path to the encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @param mimeType mime-type of the file
* @param fileParameter Pdfdictionary containing file parameters
* @return PdfFileSpec containing the file specification of the encrypted payload
* @throws java.io.IOException in case of any I/O error
*/
public static PdfFileSpec create(PdfDocument doc, String filePath, PdfEncryptedPayload encryptedPayload, PdfName mimeType, PdfDictionary fileParameter) throws IOException {
return addEncryptedPayloadDictionary(PdfFileSpec.createEmbeddedFileSpec(doc, filePath, generateDescription(encryptedPayload), generateFileDisplay(encryptedPayload), mimeType, fileParameter, PdfName.EncryptedPayload), encryptedPayload);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param filePath path to the encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @param mimeType mime-type of the file
* @return PdfFileSpec containing the file specification of the encrypted payload
* @throws java.io.IOException in case of any I/O error
*/
public static PdfFileSpec create(PdfDocument doc, String filePath, PdfEncryptedPayload encryptedPayload, PdfName mimeType) throws IOException {
return create(doc, filePath, encryptedPayload, mimeType, null);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param filePath path to the encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @return PdfFileSpec containing the file specification of the encrypted payload
* @throws java.io.IOException in case of any I/O error
*/
public static PdfFileSpec create(PdfDocument doc, String filePath, PdfEncryptedPayload encryptedPayload) throws IOException {
return create(doc, filePath, encryptedPayload, null, null);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param is stream containing encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @param mimeType mime-type of the file
* @param fileParameter Pdfdictionary containing file parameters
* @return PdfFileSpec containing the file specification of the encrypted payload
*/
public static PdfFileSpec create(PdfDocument doc, InputStream is, PdfEncryptedPayload encryptedPayload, PdfName mimeType, PdfDictionary fileParameter) {
return addEncryptedPayloadDictionary(PdfFileSpec.createEmbeddedFileSpec(doc, is, generateDescription(encryptedPayload), generateFileDisplay(encryptedPayload), mimeType, fileParameter, PdfName.EncryptedPayload), encryptedPayload);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param is stream containing encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @param mimeType mime-type of the file
* @return PdfFileSpec containing the file specification of the encrypted payload
*/
public static PdfFileSpec create(PdfDocument doc, InputStream is, PdfEncryptedPayload encryptedPayload, PdfName mimeType) {
return create(doc, is, encryptedPayload, mimeType, null);
}
/**
* Embed a encrypted payload to a PdfDocument.
*
* @param doc PdfDocument to add the file to
* @param is stream containing encrypted file
* @param encryptedPayload the encrypted payload dictionary
* @return PdfFileSpec containing the file specification of the encrypted payload
*/
public static PdfFileSpec create(PdfDocument doc, InputStream is, PdfEncryptedPayload encryptedPayload) {
return create(doc, is, encryptedPayload, null, null);
}
public static PdfFileSpec wrap(PdfDictionary dictionary) {
if (!PdfName.EncryptedPayload.equals(dictionary.getAsName(PdfName.AFRelationship))) {
LoggerFactory.getLogger(PdfEncryptedPayloadFileSpecFactory.class)
.error(IoLogMessageConstant.ENCRYPTED_PAYLOAD_FILE_SPEC_SHALL_HAVE_AFRELATIONSHIP_FILED_EQUAL_TO_ENCRYPTED_PAYLOAD);
}
PdfDictionary ef = dictionary.getAsDictionary(PdfName.EF);
if (ef == null || (ef.getAsStream(PdfName.F) == null) && (ef.getAsStream(PdfName.UF) == null)) {
throw new PdfException(KernelExceptionMessageConstant.ENCRYPTED_PAYLOAD_FILE_SPEC_SHALL_HAVE_EF_DICTIONARY);
}
if (!PdfName.Filespec.equals(dictionary.getAsName(PdfName.Type))) {
throw new PdfException(
KernelExceptionMessageConstant.ENCRYPTED_PAYLOAD_FILE_SPEC_SHALL_HAVE_TYPE_EQUAL_TO_FILESPEC);
}
if (!dictionary.isIndirect()) {
throw new PdfException(KernelExceptionMessageConstant.ENCRYPTED_PAYLOAD_FILE_SPEC_SHALL_BE_INDIRECT);
}
PdfFileSpec fileSpec = PdfFileSpec.wrapFileSpecObject(dictionary);
if (PdfEncryptedPayload.extractFrom(fileSpec) == null) {
throw new PdfException(
KernelExceptionMessageConstant.ENCRYPTED_PAYLOAD_FILE_SPEC_DOES_NOT_HAVE_ENCRYPTED_PAYLOAD_DICTIONARY);
}
return fileSpec;
}
// Note as stated by spec the desscription and file display
// shall not be derived from the encrypted payload's actual file name
// to avoid potential disclosure of sensitive information
public static String generateDescription(PdfEncryptedPayload ep) {
String result = "This embedded file is encrypted using " + ep.getSubtype().getValue();
PdfName version = ep.getVersion();
if (version != null) {
result += " , version: " + version.getValue();
}
return result;
}
public static String generateFileDisplay(PdfEncryptedPayload ep) {
return ep.getSubtype().getValue() + "Protected.pdf";
}
private static PdfFileSpec addEncryptedPayloadDictionary(PdfFileSpec fs, PdfEncryptedPayload ep) {
((PdfDictionary)fs.getPdfObject()).put(PdfName.EP, ep.getPdfObject());
return fs;
}
}
