Innovenergy_trunk/csharp/App/Backend/Database/Read.cs

using InnovEnergy.App.Backend.DataTypes;
using InnovEnergy.App.Backend.Relations;
namespace InnovEnergy.App.Backend.Database;


public static partial class Db 
{
    //In this file, we provide all the methods that can be used in order to retrieve information from the database (read)
    public static Folder? GetFolderById(Int64? id)
    {
        return Folders
              .FirstOrDefault(f => f.Id == id);
    }
        
    public static Installation? GetInstallationById(Int64? id)
    {
        return Installations
            .FirstOrDefault(i => i.Id == id);
    }
    
    public static UserAction? GetActionById(Int64? id)
    {
        return UserActions
            .FirstOrDefault(i => i.Id == id);
    }
    
    public static User? GetUserById(Int64? id)
    {
        return Users
            .FirstOrDefault(u => u.Id == id);
    }
    
    public static User? GetUserByEmail(String email)
    {
        return Users
              .FirstOrDefault(u => u.Email == email);
    }

    public static Session? GetSession(String token)
    {
        //This method is called in almost every controller function.
        //After logging in, the frontend receives a session object which contains a token. For all the future REST API calls, this token is used for session authentication.
        var session = Sessions
                     .FirstOrDefault(s => s.Token == token);

        if (session is null)
        {
            return null;
        }

        if (!session.Valid)
        {
            Delete(session);
            return null;
        }

        return session;
    }
}