/// <summary>
/// Figures out the filename of this message part.
/// <see cref="FileName"/> property.
/// </summary>
/// <param name="rawBody">The body that needs to be parsed</param>
/// <param name="headers">The headers that should be used from the message</param>
/// <param name="defaultName">The default filename to use, if no other could be found</param>
/// <returns>The filename found, or the default one if not such filename could be found in the headers</returns>
/// <exception cref="ArgumentNullException">if <paramref name="headers"/> is <see langword="null"/></exception>
private static string FindFileName(byte[] rawBody, MessageHeader headers, string defaultName)
{
if (headers == null)
{
throw new ArgumentNullException("headers");
}
if (headers.ContentDisposition != null && headers.ContentDisposition.FileName != null)
{
return(headers.ContentDisposition.FileName);
}
var extensionFromContentType = string.Empty;
string contentTypeName = null;
if (headers.ContentType != null)
{
extensionFromContentType = MimeType.GetExtensionFromMimeType(headers.ContentType.MediaType);
contentTypeName = headers.ContentType.Name;
}
if (!string.IsNullOrEmpty(headers.ContentDescription))
{
return(FileManager.RemoveInvalidFileNameChars(headers.ContentDescription) + extensionFromContentType);
}
if (!string.IsNullOrEmpty(headers.Subject))
{
return(FileManager.RemoveInvalidFileNameChars(headers.Subject) + extensionFromContentType);
}
if (extensionFromContentType.Equals(".eml", StringComparison.OrdinalIgnoreCase))
{
try
{
var message = new Message(rawBody);
if (message.Headers != null && !string.IsNullOrEmpty(message.Headers.Subject))
{
return(FileManager.RemoveInvalidFileNameChars(message.Headers.Subject) + extensionFromContentType);
}
}
// ReSharper disable once EmptyGeneralCatchClause
catch {}
}
if (!string.IsNullOrEmpty(contentTypeName))
{
return(contentTypeName);
}
return(defaultName + extensionFromContentType);
}