invoiceninja/app/Exceptions/Handler.php

<?php namespace App\Exceptions;

use Braintree\Util;
use Illuminate\Support\Facades\Response;
use Redirect;
use Utils;
use Exception;
use Crawler;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Illuminate\Http\Exception\HttpResponseException;
use Illuminate\Auth\Access\AuthorizationException;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Illuminate\Foundation\Validation\ValidationException;


/**
 * Class Handler
 */
class Handler extends ExceptionHandler
{

	/**
	 * A list of the exception types that should not be reported.
	 *
	 * @var array
	 */
	protected $dontReport = [
        AuthorizationException::class,
        HttpException::class,
        ModelNotFoundException::class,
        ValidationException::class,
	];

    /**
     * Report or log an exception.
     *
     * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
     *
     * @param  \Exception $e
     * @return bool|void
     */
	public function report(Exception $e)
	{
        // don't show these errors in the logs
        if ($e instanceof NotFoundHttpException) {
            if (Crawler::isCrawler()) {
                return false;
            }
        } elseif ($e instanceof HttpResponseException) {
            return false;
        }

        if (Utils::isNinja() && ! Utils::isTravis()) {
            Utils::logError(Utils::getErrorString($e));
            return false;
        } else {
            return parent::report($e);
        }
    }

	/**
	 * Render an exception into an HTTP response.
	 *
	 * @param  \Illuminate\Http\Request  $request
	 * @param  \Exception  $e
	 * @return \Illuminate\Http\Response
	 */
	public function render($request, Exception $e)
	{
        if ($e instanceof ModelNotFoundException) {
            return Redirect::to('/');
        } if ($e instanceof \Illuminate\Session\TokenMismatchException) {
            // prevent loop since the page auto-submits
            if ($request->path() != 'get_started') {
                // https://gist.github.com/jrmadsen67/bd0f9ad0ef1ed6bb594e
                return redirect()
                        ->back()
                        ->withInput($request->except('password', '_token'))
                        ->with([
                            'warning' => trans('texts.token_expired')
                        ]);
            }
        }

        if($this->isHttpException($e))
        {
            switch ($e->getStatusCode())
            {
                // not found
                case 404:
                    if($request->header('X-Ninja-Token') != '') {
                        //API request which has hit a route which does not exist

                        $error['error'] = ['message'=>'Route does not exist'];
                        $error = json_encode($error, JSON_PRETTY_PRINT);
                        $headers = Utils::getApiHeaders();

                        return response()->make($error, 404, $headers);

                    }
                    break;

                // internal error
                case '500':
                    if($request->header('X-Ninja-Token') != '') {
                        //API request which produces 500 error

                        $error['error'] = ['message'=>'Internal Server Error'];
                        $error = json_encode($error, JSON_PRETTY_PRINT);
                        $headers = Utils::getApiHeaders();

                        return response()->make($error, 500, $headers);
                    }
                    break;

            }
        }

        // In production, except for maintenance mode, we'll show a custom error screen
        if (Utils::isNinjaProd()
            && !Utils::isDownForMaintenance()
            && !($e instanceof HttpResponseException)
            && !($e instanceof ValidationException)) {
            $data = [
                'error' => get_class($e),
                'hideHeader' => true,
            ];

            return response()->view('error', $data);
        } else {
            return parent::render($request, $e);
        }
	}
}