/// <summary>
/// Performs the login into the application.
/// </summary>
/// <param name="login">Login of the user</param>
/// <param name="password">Password of the user</param>
/// <returns>An User DTO representing the logged user and session if the login
/// is ok, null otherwise</returns>
public static RecursoDTO Login(string login, string password)
{
using (EntitiesModel context = new EntitiesModel())
{
// Retrieve user from database with the given login/pass combination
WEB_RECURSO recurso = context.WEB_RECURSOs.Where(p => p.EMAIL == login && p.PASS_RECURSO == password).FirstOrDefault();
// If the combination user/pass is not correct, then return null information.
if (recurso == null)
{
return null;
}
// Create a new session token GUID without scores.
string guid = Guid.NewGuid().ToString().Replace("-", "");
// Build the user information DTO from the user entity and the session token
RecursoDTO result = new RecursoDTO();
result.Fill(recurso);
result.SessionToken = guid;
// Remove other sessions of this user
WEB_SESSION session = context.WEB_SESSIONs.Where(p => p.User_id == recurso.ID_RECURSO).FirstOrDefault();
if (session != null)
{
context.Delete(session);
}
// Build the session entity
session = new WEB_SESSION();
session.Session_guid = result.SessionToken;
session.User_id = result.Id_Recurso;
session.Creation_dttm = DateTime.UtcNow;
// Insert the session into database
context.Add(session);
// Commit changes
context.SaveChanges();
return result;
}
}
/// <summary>
/// Gets the user information from a session token.
/// It's useful when a user has logged in and the session token is stored
/// in the local storage, so entering the page can send the session token and
/// enter the application without login in again.
/// </summary>
/// <param name="sessionToken">Session token GUID</param>
/// <returns>User information attached to this session token, or null if the
/// session token is invalid or expired.</returns>
public static RecursoDTO GetUserInfo(string sessionToken)
{
using (EntitiesModel context = new EntitiesModel())
{
WEB_SESSION session = context.WEB_SESSIONs.Where(p => p.Session_guid == sessionToken).FirstOrDefault();
if (session == null)
{
return null;
}
RecursoDTO result = new RecursoDTO();
result.Fill(session.WEB_RECURSO);
result.SessionToken = sessionToken;
return result;
}
}
/// <summary>
/// Constructor of the class.
/// </summary>
/// <param name="user">Information of the user of the session.</param>
public ContextManager(RecursoDTO user)
{
this.User = user;
}
/// <summary>
/// Gets a context manager from a session token, representing a context filtered
/// by the information of the user.
/// </summary>
/// <param name="sessionToken">Session token GUID</param>
/// <returns>Context Manager instance for this session, or null if the
/// session is invalid or expired.</returns>
public static ContextManager GetContext(string sessionToken)
{
using (EntitiesModel context = new EntitiesModel())
{
WEB_SESSION session = context.WEB_SESSIONs.Where(p => p.Session_guid == sessionToken).FirstOrDefault();
if (session == null)
{
return null;
}
RecursoDTO recurso = new RecursoDTO();
recurso.Fill(session.WEB_RECURSO);
recurso.SessionToken = sessionToken;
return new ContextManager(recurso);
}
}
