snipe-it/app/Http/Controllers/ActionlogController.php

<?php

namespace App\Http\Controllers;

use App\Helpers\Helper;
use Response;

class ActionlogController extends Controller
{
    public function displaySig($filename)
    {
        // PHP doesn't let you handle file not found errors well with 
        // file_get_contents, so we set the error reporting for just this class
        error_reporting(0);

        $this->authorize('view', \App\Models\Asset::class);
        $file = config('app.private_uploads').'/signatures/'.$filename;
        $filetype = Helper::checkUploadIsImage($file);

        $contents = file_get_contents($file, false, stream_context_create(['http' => ['ignore_errors' => true]]));
        if ($contents === false) {
            \Log::warn('File '.$file.' not found');
            return false;
        } else {
            return Response::make($contents)->header('Content-Type', $filetype);
        }
       
    }
}