// This is used for the Cryptzone Secure Email Action
// We can only support one Action that has this property and still function
// in a reasonable fashion since we are allowing the Action to remove all
// attachments and replace then with completely new ones. JE 19.10.2011
private static void RemoveAllAttachments(dynamic mailItem)
{
Redemption.SafeMailItem messageItem = new Redemption.SafeMailItemClass();
using (new ComRelease(messageItem))
{
messageItem.Item = mailItem.UnSafeMailItem;
Redemption.Attachments attachments = messageItem.Attachments;
for (int index = attachments.Count; index > 0; --index)
{
// TODO: The way OLE attachments are handled needs looking into.
// Currently OLE objects are not added back to the outgoing mail item
// as processed attachments, so we need to make sure we don't remove them here.
if (attachments[index].Type != (int) MsOutlook.OlAttachmentType.olOLE)
{
attachments.Remove(index);
}
}
}
}
// This is used for the Cryptzone Secure Email Action
// We can only support one Action that has this property and still function
// in a reasonable fashion since we are allowing the Action to remove all
// attachments and replace then with completely new ones. JE 19.10.2011
public void ReplaceAttachments(dynamic mailItem, Workshare.PolicyContent.Attachment[] processedAttachments)
{
RemoveAllAttachments(mailItem);
var rdMAPIUtils = new Redemption.MAPIUtilsClass();
Redemption.SafeMailItem messageItem = new Redemption.SafeMailItemClass();
using (new ComRelease(messageItem))
{
messageItem.Item = mailItem.UnSafeMailItem;
int renderingPosition = 1;
foreach (var attachment in processedAttachments)
{
string fileName = attachment.FileName;
string displayName = attachment.Name;
Redemption.Attachment rdAttachment;
if (fileName.EndsWith(".msg", StringComparison.InvariantCultureIgnoreCase))
{
Redemption.MessageItem msgItem = rdMAPIUtils.GetItemFromMsgFile(fileName, false);
// Need to release "msgitem" before delete the file, as it holds reference to the file.
using (new ComRelease(msgItem))
{
// Attach .msg via "olEmbeddedItem" to avoid Unicode msg attachment being blocked
// by "Symantec anti-virus Outlook addin"
rdAttachment = messageItem.Attachments.Add(msgItem, OlAttachmentType.olEmbeddeditem,
renderingPosition, displayName);
// Redemption does not set Unicode displayname properly, need to set manually.
rdAttachment.Fields[MapiDefines.PR_DISPLAY_NAME_W] = displayName;
}
}
else
{
rdAttachment = messageItem.Attachments.Add(fileName, OlAttachmentType.olByValue,
renderingPosition, displayName);
// Redemption.dll (current version 4.6.0.924) didn't handle Unicode correctly for
// Attachments.Add() function. It attempts to convert Unicode filename to Ansi code
// based on current System Locale ("Language for non-Unicode program").
// Attachment with "e.g. Chinese/Cyrillic" filename will appear as "????".
// Check whether filename can be encoded with current default code page.
Encoding ansiEncoding = Encoding.GetEncoding(Encoding.Default.CodePage,
new EncoderExceptionFallback(),
new DecoderExceptionFallback());
try
{
byte[] ansiBytes = ansiEncoding.GetBytes(displayName);
}
catch (EncoderFallbackException)
{
// If cannot convert using current system codepage, Redemption's Attachments.add()
// will not behave correctly. Have to manually set the FileName and Displayname with Unicode string.
rdAttachment.Fields[MapiDefines.PR_ATTACH_LONG_FILENAME_W] = displayName;
rdAttachment.Fields[MapiDefines.PR_ATTACH_FILENAME_W] = displayName;
rdAttachment.Fields[MapiDefines.PR_DISPLAY_NAME_W] = displayName;
}
}
//We have an attachment that was not in the original collection.
//Dont have all the info but we at least know the attachment content id.
if (!string.IsNullOrEmpty(attachment.Id))
{
rdAttachment.Fields[MapiDefines.PR_ATTACH_CONTENT_ID] = attachment.Id;
}
++renderingPosition;
}
}
rdMAPIUtils.Cleanup();
if (Marshal.IsComObject(rdMAPIUtils))
{
Marshal.ReleaseComObject(rdMAPIUtils);
}
}