private static bool IsSignatureHtml(IWSAttachment attachment)
{
var id = attachment.GetFields(MAPIProxy.MapiDefines.PR_ATTACH_CONTENT_ID);
var idw = attachment.GetFields(MAPIProxy.MapiDefines.PR_ATTACH_CONTENT_ID_W);
string contentId = string.Empty;
if (id != null)
{
contentId = id.ToString();
}
string contentIdw = string.Empty;
if (idw != null)
{
contentIdw = idw.ToString();
}
if (!string.IsNullOrEmpty(contentId) || !string.IsNullOrEmpty(contentIdw))
{
// Only allow file types we DON'T clean to be signatures.
if (FileTypeBridge.GetSupportedFileType(attachment.FileName) == FileType.Unknown)
{
Interop.Logging.Logger.LogInfo(string.Format("Signature {0} on Html formatted message", attachment.FileName));
return true;
}
}
return false;
}
public static bool IsSignature(IWSAttachment attachment, MessageBodyFormat bodyFormat)
{
switch (bodyFormat)
{
case MessageBodyFormat.Html:
return IsSignatureHtml(attachment);
case MessageBodyFormat.Rtf:
return IsSignatureRtf(attachment);
}
return false;
}
public static bool IsSignature(IWSAttachment attachment, OlBodyFormat bodyFormat)
{
switch (bodyFormat)
{
case OlBodyFormat.olFormatHTML:
return IsSignatureHtml(attachment);
case OlBodyFormat.olFormatRichText:
return IsSignatureRtf(attachment);
}
return false;
}
private static bool IsSignatureRtf(IWSAttachment attachment)
{
var field = attachment.GetFields(MAPIProxy.MapiDefines.PR_ATTACH_METHOD);
if ((field != null) && ((int)field == MAPIProxy.MapiDefines.ATTACH_OLE))
{
try
{
// Only allow file types we DON'T clean to be signatures.
if (FileTypeBridge.GetSupportedFileType(attachment.FileName) == FileType.Unknown)
{
Interop.Logging.Logger.LogInfo(string.Format("Signature {0} on Rtf formatted message", attachment.FileName));
return true;
}
}
catch (Exception)
{
// When the mail format is rtf you are unable access the filename property of embedded images.
return true;
}
}
return false;
}
