Kavita/Kavita.Server/Controllers/OidcController.cs

using System.Threading.Tasks;
using Kavita.API.Attributes;
using Kavita.Common;
using Kavita.Server.Extensions;
using Kavita.Services;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.IdentityModel.Protocols;
using Microsoft.IdentityModel.Protocols.OpenIdConnect;

namespace Kavita.Server.Controllers;

[Route("[controller]")]
public class OidcController([FromServices] ConfigurationManager<OpenIdConnectConfiguration>? configurationManager = null): ControllerBase
{
    [AllowAnonymous]
    [SkipDeviceTracking]
    [HttpGet("login")]
    public IActionResult Login(string returnUrl = "/")
    {
        if (returnUrl == "/" || !Url.IsLocalUrl(returnUrl))
        {
            returnUrl = Configuration.BaseUrl;
        }

        var properties = new AuthenticationProperties { RedirectUri = returnUrl };
        return Challenge(properties, IdentityServiceExtensions.OpenIdConnect);
    }

    [SkipDeviceTracking]
    [HttpGet("logout")]
    public async Task<IActionResult> Logout()
    {

        if (!Request.Cookies.ContainsKey(OidcService.CookieName))
        {
            return Redirect(Configuration.BaseUrl);
        }

        var res = await Request.HttpContext.AuthenticateAsync(CookieAuthenticationDefaults.AuthenticationScheme);
        if (configurationManager == null || !res.Succeeded || res.Properties == null || string.IsNullOrEmpty(res.Properties.GetTokenValue(OidcService.IdToken)))
        {
            HttpContext.Response.Cookies.Delete(OidcService.CookieName);
            return Redirect(Configuration.BaseUrl);
        }

        // Authelia is dysfunctional and doesn't support logging out like this
        var config = await configurationManager.GetConfigurationAsync();
        if (config == null || string.IsNullOrEmpty(config.EndSessionEndpoint))
        {
            HttpContext.Response.Cookies.Delete(OidcService.CookieName);
            return Redirect(Configuration.BaseUrl);
        }

        return SignOut(
            new AuthenticationProperties { RedirectUri = Configuration.BaseUrl+"login" },
            CookieAuthenticationDefaults.AuthenticationScheme,
            IdentityServiceExtensions.OpenIdConnect);
    }

}