public static void CreateUser(string username, string authCode, string avatar)
{
ValidateUsername(username);
ValidateAuthCode(authCode);
using (NewsFeedContext context = new NewsFeedContext())
{
var usernameToLower = username.ToLower();
var dbUser = context.Users.FirstOrDefault(u => u.Username == usernameToLower);
if (dbUser != null)
{
throw new ServerErrorException("Username already exists", "ERR_DUP_USR");
}
dbUser = new User()
{
Username = usernameToLower,
AuthenticationCode = authCode,
Avatar = avatar
};
context.Users.Add(dbUser);
context.SaveChanges();
}
}
public static void DeleteRequest(int id)
{
using (NewsFeedContext context = new NewsFeedContext())
{
var request = context.Requests.Find(id);
context.Requests.Remove(request);
context.SaveChanges();
}
}
public static void CreatePost(string title, string content, string sessionKey)
{
using (NewsFeedContext context = new NewsFeedContext())
{
Post dbPost = new Post()
{
Title = title,
Content = content,
PublicDate = DateTime.Now,
UserId = context.Users.FirstOrDefault(u => u.SessionKey == sessionKey).Id
};
context.Posts.Add(dbPost);
context.SaveChanges();
}
}
public static void SendRequest(string username, string sessionKey)
{
using (NewsFeedContext context = new NewsFeedContext())
{
Request dbRequest = new Request()
{
RecipientId = (from user in context.Users
where user.Username == username
select user.Id).FirstOrDefault(),
SenderId = (from user in context.Users
where user.SessionKey == sessionKey
select user.Id).FirstOrDefault(),
Title = "Friend request",
};
context.Requests.Add(dbRequest);
context.SaveChanges();
}
}
//Accept request
public static void AddFriend(int senderId, string sessionKey)
{
using (NewsFeedContext context = new NewsFeedContext())
{
//Add request sender as friend in request receiver's list
Friend dbFriendSender = new Friend()
{
Username = (from request in context.Requests
where request.SenderId == senderId
select request.Sender.Username).FirstOrDefault(),
Avatar = (from request in context.Requests
where request.SenderId == senderId
select request.Sender.Avatar).FirstOrDefault(),
UserId = (from user in context.Users
where user.SessionKey == sessionKey
select user.Id).FirstOrDefault()
};
//Add request receiver as friend in request sender's list
Friend dbFriendReceiver = new Friend()
{
Username = (from user in context.Users
where user.SessionKey == sessionKey
select user.Username).FirstOrDefault(),
Avatar = (from user in context.Users
where user.SessionKey == sessionKey
select user.Avatar).FirstOrDefault(),
UserId = (from request in context.Requests
where request.SenderId == senderId
select request.Sender.Id).FirstOrDefault()
};
context.Friends.Add(dbFriendSender);
context.Friends.Add(dbFriendReceiver);
context.SaveChanges();
}
}
public static string LoginUser(string username, string authCode, out string avatar)
{
ValidateUsername(username);
ValidateAuthCode(authCode);
var context = new NewsFeedContext();
using (context)
{
var usernameToLower = username.ToLower();
var user = context.Users.FirstOrDefault(u => u.Username == usernameToLower && u.AuthenticationCode == authCode);
if (user == null)
{
throw new ServerErrorException("Invalid username or password", "ERR_INV_USR");
}
var sessionKey = GenerateSessionKey((int)user.Id);
user.SessionKey = sessionKey;
avatar = user.Avatar;
context.SaveChanges();
return sessionKey;
}
}
