How to use Laravel Passport with Password Grant Tokens? - php

Question

I just read the https://laravel.com/docs/5.6/passport documentation and I have some doubts that hopefully someone could help me with:
First, some context, I want to use Passport as a way to provide Oauth authentication for my mobile app (first-party app).
When I use php artisan passport:client --password I get back a Client ID and a Client Secret. Does this value have to be fixed on my app? for example storing them hardcoded or as a "settings" file? If the values shouldn't be stored then how should it work?
To register a user to my app I use: $user->createToken('The-App')->accessToken; I get that the accessToken will be the one used for sending on all my requests as a Header (Authorization => Bearer $accessToken) but what exactly is "The-App" value for?
For login the user I'm using the URL: http://example.com/oauth/token and sending as parameters:
{
"username": "user#email.com",
"password": "userpassword",
"grant_type": "password",
"client_id": 1, // The Client ID that I got from the command (question 1)
"client_secret": "Shhh" // The Client Secret that I got from the command (question 1)
}
When I login the user using the previous endpoint I get back a refresh_token, I read that I could refresh the token through http://example.com/oauth/token/refresh but I try to request the refresh I got Error 419, I removed the url oauth/token/refresh from the csrf verification and now I get back "message": "Unauthenticated.", I'm making the following request:
Content-Type: x-www-form-urlencoded
grant_type: refresh_token
refresh_token: the-refresh-token // The Refresh Token that I got from the command (question 3)
client_id: 1 // The Client ID that I got from the command (question 1)
client_secret: Shhh // The Client Secret that I got from the command (question 1)
scope: ''
Should I use this endpoint? or is not necessary given the app I'm trying to develop.
Finally, there are a lot of endpoints that I get from passport that I don't think I will use for example: oauth/clients*, oauth/personal-access-tokens* is there a way to remove them from the endpoints published by passport?
Thanks a lot for your help!

Answer 1

If you are consuming your own api then you don't need to call http://example.com/oauth/token
for user login because then you need to store client_id and client_secret at app side. Better you create an api for login and there you can check the credentials and generate the personal token.
public function login(Request $request)
{
$credentials = $request->only('email', 'password');
if (Auth::attempt($credentials)) {
// Authentication passed...
$user = Auth::user();
$token = $user->createToken('Token Name')->accessToken;
return response()->json($token);
}
}
Finally, there are a lot of endpoints that I get from passport that I
don't think I will use for example: oauth/clients*,
oauth/personal-access-tokens* is there a way to remove them from the
endpoints published by passport?
You need to remove Passport::routes(); from AuthServiceProvider and manually put only required passport routes. I think you only need oauth/token route.
what exactly is "The-App" value for?
if you check oauth_access_tokens table it has name field. $user->createToken('Token Name')->accessToken; here the "Token Name" stored in name field.
How to use Laravel Passport with Password Grant Tokens?
To generate password grant token you have to store client_id and client_secret at app side (not recommended, check this ) and suppose if you have to reset the client_secret then the old version app stop working, these are the problems. To generate password grant token you have to call this api like you mention in step 3.
$http = new GuzzleHttp\Client;
$response = $http->post('http://your-app.com/oauth/token', [
'form_params' => [
'grant_type' => 'password',
'client_id' => 'client-id',
'client_secret' => 'client-secret',
'username' => 'taylor#laravel.com',
'password' => 'my-password',
'scope' => '',
],
]);
return json_decode((string) $response->getBody(), true);
Generate token from refresh_token
$http = new GuzzleHttp\Client;
$response = $http->post('http://your-app.com/oauth/token', [
'form_params' => [
'grant_type' => 'refresh_token',
'refresh_token' => 'the-refresh-token',
'client_id' => 'client-id',
'client_secret' => 'client-secret',
'scope' => '',
],
]);
return json_decode((string) $response->getBody(), true);
You can look this https://laravel.com/docs/5.6/passport#implicit-grant-tokens too.

Answer 2

Tackling Question 5
Finally, there are a lot of endpoints that I get from passport that I don't think I will use for example: oauth/clients*, oauth/personal-access-tokens* is there a way to remove them from the endpoints published by passport?
Passport::routes($callback = null, array $options = []) takes an optional $callback function and optional $options argument.
The callback function takes a $router argument from which you can then choose which routes to install as shown below in your AuthServiceProvider.php that is enabling a more granular configuration:
Passport::routes(function ($router) {
$router->forAccessTokens();
$router->forPersonalAccessTokens();
$router->forTransientTokens();
});
Passport::tokensExpireIn(Carbon::now()->addMinutes(10));
Passport::refreshTokensExpireIn(Carbon::now()->addDays(10));
This way we only create the passport routes that we need.
forAccessTokens(); enable us to create access tokens.
forPersonalAccessTokens(); enable us to create personal tokens although we will not use this in this article. Lastly,
forTransientTokens(); creates the route for refreshing tokens.
If you run php artisan route:list you can see the new endpoints installed by Laravel Passport.
| POST | oauth/token | \Laravel\Passport\Http\Controllers\AccessTokenController#issueToken
| POST | oauth/token/refresh | \Laravel\Passport\Http\Controllers\TransientTokenController#refresh