ProjectLighthouse/ProjectLighthouse.Servers.Website/Controllers/ResourcesController.cs

using LBPUnion.ProjectLighthouse.Files;
using Microsoft.AspNetCore.Mvc;
using IOFile = System.IO.File;

namespace LBPUnion.ProjectLighthouse.Servers.Website.Controllers;

[ApiController]
public class ResourcesController : ControllerBase
{
    [ResponseCache(Duration = 86400)]
    [HttpGet("/gameAssets/{hash}")]
    public IActionResult GetGameImage(string hash)
    {
        string path = FileHelper.GetImagePath($"{hash}.png");

        string fullPath = Path.GetFullPath(path);

        // Prevent directory traversal attacks
        if (!fullPath.StartsWith(FileHelper.FullImagePath)) return this.BadRequest();

        if (IOFile.Exists(path)) return this.File(IOFile.OpenRead(path), "image/png");

        LbpFile? file = LbpFile.FromHash(hash);
        if (file != null && FileHelper.LbpFileToPNG(file)) return this.File(IOFile.OpenRead(path), "image/png");

        return this.NotFound();
    }
}