async Task ProcessNewEmailAsync(IMessageSummary summary, CancellationToken ct)
{
var subject = summary.Envelope.Subject;
logger.LogInformation("New Email arrived. subject: {0}, uid: {1}", subject, summary.UniqueId.Id);
if (subject == null)
{
logger.LogInformation("Uid: {0} process failed, no subject.", summary.UniqueId.Id);
return;
}
if (!(subject.Contains("操作系统") && subject.Contains("实验一")))
{
logger.LogInformation("Uid: {0} process failed, subject not match", summary.UniqueId.Id);
return;
}
var student = Student.AllStudents.SingleOrDefault(
s => subject.Contains(s.Name) ||
summary.Envelope.From.Any(a => a.Name.Contains(s.Name)) ||
summary.Attachments.Any(a => a.FileName.Contains(s.Name)));
if (student == null)
{
logger.LogInformation("Uid: {0} process failed, no student found", summary.UniqueId.Id);
return;
}
var attachmentMetadata = summary.Attachments.FirstOrDefault(a => KnownHomeworkExtensions.IsPathHasKnownExtension(a.FileName));
if (attachmentMetadata == null)
{
logger.LogInformation("Uid: {0} process failed, no attachment found", summary.UniqueId.Id);
return;
}
var attachment = (MimePart)await client.Inbox.GetBodyPartAsync(summary.UniqueId, attachmentMetadata, ct);
Email email = new Email
{
EmailUID = summary.UniqueId.Id,
AttachmentName = attachment.FileName,
SenderName = student.Name,
FromAddress = summary.Envelope.From.OfType <MailboxAddress>().First().Address,
};
MemoryStream content = new MemoryStream();
await attachment.Content.DecodeToAsync(content);
content.Position = 0;
email.AttachmentSHA1 = sha1.ComputeHash(content);
content.Position = 0;
if (options.AttachmentSavePath != null)
{
email.FileSavePath = Path.GetFullPath(Path.Combine(options.AttachmentSavePath, $"{student.StudentNumber}-{student.Name}{Path.GetExtension(attachment.FileName)}"));
using (var file = File.OpenWrite(email.FileSavePath))
{
content.CopyTo(file);
}
}
context.Email.Add(email);
await context.SaveChangesAsync();
logger.LogInformation("Uid: {0} process success", summary.UniqueId.Id);
}
