gott/Middleware/AuthMiddleware.cs

using System.Threading.Tasks;
using Gott.Services;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;

namespace Gott.Middleware;

public class AuthMiddleware
{
    private readonly RequestDelegate _next;
    private readonly string _kreaApiKey;

    public AuthMiddleware(RequestDelegate next, IConfiguration config)
    {
        _next = next;
        _kreaApiKey = config["KreaApiKey"] ?? "";
    }

    public async Task InvokeAsync(HttpContext ctx, AuthService auth, DatabaseService db)
    {
        var path = ctx.Request.Path.Value ?? "";

        // Static files, login and telegram webhook don't require auth
        var isTelegramWebhook = path.StartsWith("/api/telegram/webhook/") && ctx.Request.Method == "POST";
        var isSharedGet = path.StartsWith("/api/shared/") && ctx.Request.Method == "GET";
        var isAutologin = path == "/api/auth/autologin" && ctx.Request.Method == "GET";
        var isImageFile = path.StartsWith("/api/images/file/") && ctx.Request.Method == "GET";
        if (!path.StartsWith("/api/") || path == "/api/auth/login" || isTelegramWebhook || isSharedGet || isAutologin || isImageFile)
        {
            await _next(ctx);
            return;
        }

        // Krea API-Key auth (for automation without user context)
        if (path.StartsWith("/api/images/") && !string.IsNullOrEmpty(_kreaApiKey))
        {
            var apiKey = ctx.Request.Headers["X-Api-Key"].ToString();
            if (!string.IsNullOrEmpty(apiKey) && apiKey == _kreaApiKey)
            {
                await _next(ctx);
                return;
            }
        }

        var token = ctx.Request.Cookies["gott_token"];
        var userId = auth.ValidateToken(token);

        if (userId == null)
        {
            ctx.Response.StatusCode = 401;
            await ctx.Response.WriteAsJsonAsync(new { error = "Not authenticated" });
            return;
        }

        ctx.Items["UserId"] = userId;

        var user = await db.GetUser(userId);
        ctx.Items["IsAdmin"] = user?.IsAdmin ?? false;

        await _next(ctx);
    }
}