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invoiceninja/app/Http/Middleware/DuplicateSubmissionCheck.php

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<?php namespace app\Http\Middleware;
use Closure;
class DuplicateSubmissionCheck
{
// Prevent users from submitting forms twice
public function handle($request, Closure $next)
{
if (in_array($request->method(), ['POST', 'PUT', 'DELETE'])) {
$lastPage = session(SESSION_LAST_REQUEST_PAGE);
$lastTime = session(SESSION_LAST_REQUEST_TIME);
if ($lastPage == $request->path() && (microtime(true) - $lastTime <= 1.5)) {
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return redirect('/')->with('warning', trans('texts.duplicate_post'));
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}
session([SESSION_LAST_REQUEST_PAGE => $request->path()]);
session([SESSION_LAST_REQUEST_TIME => microtime(true)]);
}
return $next($request);
}
}