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Decrypt PDF files before attempting appending new pages #59

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Decrypt PDF files before attempting appending new pages #59

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15 changes: 15 additions & 0 deletions ...t-repo/src/main/java/org/alfresco/extension/pdftoolkit/service/PDFToolkitServiceImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,7 @@
import org.apache.pdfbox.multipdf.PDFMergerUtility;
import org.apache.pdfbox.multipdf.Splitter;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
import org.springframework.extensions.surf.util.I18NUtil;

import com.itextpdf.text.Document;
Expand Down Expand Up @@ -125,6 +126,9 @@ public NodeRef appendPDF(NodeRef targetNodeRef, Map<String, Serializable> params
pdf = PDDocument.load(is);
pdfTarget = PDDocument.load(tis);

pdf = decryptPdf(pdfTarget, is);
pdfTarget = decryptPdf(pdfTarget, tis);

// Append the PDFs
PDFMergerUtility merger = new PDFMergerUtility();
merger.appendDocument(pdfTarget, pdf);
Expand Down Expand Up @@ -216,6 +220,17 @@ public NodeRef appendPDF(NodeRef targetNodeRef, Map<String, Serializable> params

return destinationNode;
}

private PDDocument decryptPdf(PDDocument pdf, InputStream tis) throws IOException, InvalidPasswordException {
// if the document is encrypted, try to remove its protection by using the "" (EMPTY) password
// as an attempt before failing during the append operation
if(pdf.isEncrypted()) {
pdf.close();
pdf = PDDocument.load(tis, "");
pdf.setAllSecurityToBeRemoved(true);
}
return pdf;
}

@Override
public NodeRef encryptPDF(NodeRef targetNodeRef, Map<String, Serializable> params)
Expand Down