protected override DecryptResult Decrypt(IContentEncryptionUi ui, string sourceFile)
{
object doc = null;
string tempfile = Path.GetTempFileName();
var decryptWrapper = new WordApplicationDecryptWrapper();
try
{
decryptWrapper.CreateHostApplication();
DecryptResult result = OpenDocument(ui, sourceFile, out doc, decryptWrapper);
if (result != DecryptResult.Ok)
{
return result;
}
// Modify document passwords, save to -another- temporary file (decryptedPath)
// Need to save twice, or for some reason the read/modify passwords get kept
Logger.LogDebug(string.Format("WordEncryption.Decrypt: Saving attachment to \"{0}\"", sourceFile));
decryptWrapper.SetOpenPassword(doc, string.Empty);
decryptWrapper.SetWritePassword(doc, string.Empty);
try
{
decryptWrapper.Save(doc);
}
catch (InvalidOperationException ex)
{
// if the document is readonly, Save() throws up UI, so instead it throws an InvalidOperationException, which we ignore...
Logger.LogInfo(ex);
}
// If you have Office 2003 & a .docx file the SaveDocumentAs cannot write over the original
// source file as it is currently locked. As a workaround we save to a temporary file
// then move the tempfile over the sourceFile
decryptWrapper.SaveDocumentAs(doc, tempfile, false, string.Empty, string.Empty);
}
finally
{
if (doc != null)
{
decryptWrapper.CloseDocument(doc, false);
}
decryptWrapper.Dispose();
}
if (File.Exists(sourceFile))
{
File.Delete(sourceFile);
}
File.Move(tempfile, sourceFile); // creates an empty file where sourceFile was -> only do if no error!!
return DecryptResult.Ok;
}
