LehrerApp/LehrerApp.Api/UserStore.cs

using LiteDB;

namespace LehrerApp.Api;

public class UserStore(string dataPath) : IDisposable
{
    private readonly LiteDatabase _db = new(Path.Combine(dataPath, "users.db"));

    private ILiteCollection<UserEntry> Col
    {
        get
        {
            var col = _db.GetCollection<UserEntry>("users");
            col.EnsureIndex(x => x.Username, unique: true);
            return col;
        }
    }

    public bool CreateUser(string username, string password)
    {
        if (Col.Exists(x => x.Username == username)) return false;
        Col.Insert(new UserEntry { Username = username, PasswordHash = PasswordHasher.Hash(password) });
        return true;
    }

    public bool SetPassword(string username, string password)
    {
        var user = Col.FindOne(x => x.Username == username);
        if (user is null) return false;
        user.PasswordHash = PasswordHasher.Hash(password);
        Col.Update(user);
        return true;
    }

    public bool VerifyPassword(string username, string password)
    {
        var user = Col.FindOne(x => x.Username == username);
        return user is not null && PasswordHasher.Verify(password, user.PasswordHash);
    }

    public void Dispose() => _db.Dispose();
}

internal class UserEntry
{
    public ObjectId Id { get; set; } = ObjectId.NewObjectId();
    public string Username { get; set; } = "";
    public string PasswordHash { get; set; } = "";
}