How to custom laravel passport error message?

Question

When I use laravel5.3's Passport Password Grant Tokens

this.$http.post('/oauth/token', this.form)
     .then(response => {
         console.log(response)
     })

I get this message

{"error":"invalid_credentials","message":"The user credentials were incorrect."}

I want to know how to custom this error message.

Answer 1

According @driesvints in #937 Laravel Passport is working to develop a simplified way to customize Passport's errors. Until then you can use the following codes. I tested them and use them.

1. In page App\Providers\AppServiceProvider.php add:

use Laravel\Passport\Http\Controllers\AccessTokenController;

...

public function register()
    {
        $this->app->bind( AccessTokenController::class, \App\myOAuth\AccessTokenController::class);
    }

2. Make this page: App\myOAuth\AccessTokenController.php

<?php

namespace App\myOAuth;

use GuzzleHttp\Exception\ClientException;
use Laravel\Passport\Http\Controllers\AccessTokenController as PassportAccessTokenController;
use League\OAuth2\Server\Exception\OAuthServerException;
use Psr\Http\Message\ServerRequestInterface;
use Zend\Diactoros\Response as Psr7Response;

class AccessTokenController extends PassportAccessTokenController
{
    /**
     * Authorize a client to access the user's account.
     *
     * @param  ServerRequestInterface $request
     *
     * @return \Psr\Http\Message\ResponseInterface
     * @throws \League\OAuth2\Server\Exception\OAuthServerException
     */
    public function issueToken(ServerRequestInterface $request)
    {
        try {
            return $this->server->respondToAccessTokenRequest($request, new Psr7Response);
        } catch (ClientException $exception) {
            $error = json_decode($exception->getResponse()->getBody());

            throw OAuthServerException::invalidRequest('access_token', object_get($error, 'error.message'));
        }
    }
}

3. In App\Exceptions\Handler.php add your customized Exceptions

public function render($request, Exception $exception)
    {

    ...

    $class = get_class($exception);

    ...


        if ($class == 'League\OAuth2\Server\Exception\OAuthServerException' ){
            return response()->json([
              'code'=>$exception->getHttpStatusCode(),
              'error'=>$exception->getMessage(),
              'error_type'=>$exception->getErrorType()
            ],
            $exception->getHttpStatusCode());
        } 

        ...

        return parent::render($request, $exception);
    }