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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.Memory
* File: SessionIdFactory.cs
*
* SessionIdFactory.cs is part of VNLib.Plugins.Essentials.Sessions.Memory which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Sessions.Memory is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.Sessions.Memory is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Diagnostics.CodeAnalysis;
using VNLib.Hashing;
using VNLib.Net.Http;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Essentials.Sessions.Runtime;
#nullable enable
namespace VNLib.Plugins.Essentials.Sessions.Memory
{
internal sealed class SessionIdFactory : ISessionIdFactory
{
private readonly int IdSize;
private readonly string cookieName;
private readonly TimeSpan ValidFor;
public SessionIdFactory(uint idSize, string cookieName, TimeSpan validFor)
{
IdSize = (int)idSize;
this.cookieName = cookieName;
ValidFor = validFor;
}
public string GenerateSessionId(IHttpEvent entity)
{
//Random hex hash
string cookie = RandomHash.GetRandomBase32(IdSize);
//Set the session id cookie
entity.Server.SetCookie(cookieName, cookie, ValidFor, secure: true, httpOnly: true);
//return session-id value from cookie value
return cookie;
}
public bool TryGetSessionId(IHttpEvent entity, [NotNullWhen(true)] out string? sessionId)
{
//Get authorization token and make sure its not too large to cause a buffer overflow
if (entity.Server.GetCookie(cookieName, out sessionId))
{
return true;
}
//Only add sessions for user-agents
else if (entity.Server.IsBrowser())
{
//Get a new session id
sessionId = GenerateSessionId(entity);
return true;
}
else
{
sessionId = null;
return false;
}
}
}
}
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