/// <summary>
/// Creates <see cref="User"/> instance from name.
/// </summary>
/// <param name="name">User name.</param>
/// <param name="context">Instance of <see cref="DavContext"/>.</param>
/// <returns>Instance of <see cref="User"/> or <c>null</c> if user is not found.</returns>
public static User FromName(string name, DavContext context)
{
// Calling FindByIdentity on a machine that is not on a domain is
// very slow (even with new PrincipalContext(ContextType.Machine)).
// using PrincipalSearcher on a local machine and FindByIdentity on a domain.
Principal principal;
PrincipalContext principalContext = context.GetPrincipalContext();
try
{
if (principalContext.ContextType == ContextType.Machine)
{
// search local machine
UserPrincipal principalToSearch = new UserPrincipal(principalContext);
principalToSearch.SamAccountName = name;
principal = new PrincipalSearcher(principalToSearch).FindOne();
}
else
{
// search domain
principal = UserPrincipal.FindByIdentity(principalContext, IdentityType.SamAccountName, name);
}
if ((principal == null) || !(principal is UserPrincipal))
{
return(null);
}
}
catch (PrincipalOperationException)
{
//This exception is thrown if user cannot be found.
return(null);
}
return(new User(principal as UserPrincipal, context));
}
/// <summary>
/// Creates <see cref="Group"/> or <see cref="User"/> for windows SID.
/// </summary>
/// <param name="sid">Windows SID.</param>
/// <param name="context">Instance of <see cref="DavContext"/>.</param>
/// <returns>Corresponding <see cref="User"/> or <see cref="Group"/> or <c>null</c> if there's no user
/// or group which correspond to specified sid.</returns>
public static IPrincipalAsync GetPrincipalFromSid(string sid, DavContext context)
{
using (HostingEnvironment.Impersonate())
{ // This code runs as the application pool user
Principal pr = Principal.FindByIdentity(context.GetPrincipalContext(), IdentityType.Sid, sid);
if (pr == null)
{
return(null);
}
return(pr is GroupPrincipal
? (IPrincipalAsync) new Group((GroupPrincipal)pr, context)
: new User((UserPrincipal)pr, context));
}
}