/// <summary>
/// Updates the latest draft of a message for a given author.
/// </summary>
private async Task <Message> UpdateDraftAsync(
Conversation conversation,
int authorId,
string messageContents,
bool send,
IList <Attachment> attachments = null)
{
var message = conversation.Messages
.SingleOrDefault(m => m.AuthorId == authorId && !m.Sent.HasValue);
bool existingMessage = message != null;
if (message == null)
{
message = new Message
{
ConversationId = conversation.Id,
AuthorId = authorId,
Author = await _dbContext.Users
.Where(u => u.Id == authorId)
.SingleAsync()
};
}
message.Contents = _htmlSanitizer.SanitizeHtml(messageContents);
if (attachments != null)
{
message.Attachments = attachments;
}
if (send)
{
message.Sent = _timeProvider.UtcNow;
}
if (existingMessage)
{
_dbContext.Update(message);
}
else
{
_dbContext.Add(message);
}
return(message);
}
/// <summary>
/// Publish a new announcement.
/// </summary>
public async Task <bool> PostAnnouncementAsync(
string classroomName,
int userId,
Announcement announcement,
Func <DateTime, string> formatDateTime,
IModelErrorCollection modelErrors)
{
var classroom = await _dbContext.Classrooms
.Where(c => c.Name == classroomName)
.Include(c => c.Sections)
.SingleAsync();
var sectionIds = announcement.Sections
?.Select(s => s.SectionId)
?.ToList() ?? new List <int>();
if (!_validator.ValidateAnnouncement(classroom, announcement, modelErrors))
{
return(false);
}
announcement.ClassroomId = classroom.Id;
announcement.UserId = userId;
announcement.Contents = _htmlSanitizer.SanitizeHtml(announcement.Contents);
announcement.DatePosted = _timeProvider.UtcNow;
_dbContext.Announcements.Add(announcement);
await _dbContext.SaveChangesAsync();
await SendAnnouncementEmailAsync
(
announcement,
classroom,
sectionIds,
formatDateTime,
emailAdmins : true
);
return(true);
}