Unable to retrieve access_token using public client

[garrettjoecox]

• Passport Version: 8.0.0
• Laravel Version: 6.5.0
• PHP Version: 7.3.9
• Database Driver & Version: Sqlite

Description:

I am unable to retrieve an access token using a public client, using the changes merged in #1065

Steps To Reproduce:

• Create a new laravel project
• Install laravel/ui auth scaffolding
• Install passport
• Walk through frontend quickstart in the laravel/passport docs
• Authenticate, and create a new OAuth Client unchecking the confidential box
• Attempt to retrieve an access token hitting the endpoint /oauth/token without providing a secret.

Example payload:

{
    "grant_type": "password",
    "client_id": 3,
    "username": "username",
    "password": "password",
    "scope": "*"
}

Response:

{
    "error": "invalid_client",
    "error_description": "Client authentication failed",
    "message": "Client authentication failed"
}

Note: attempting to send that same payload but using the Laravel Password Grant Client client ID and secret generated on setup the endpoint successfully returns an access token (as intended)

[garrettjoecox]

Actually, I seem to have misunderstood PKCE, as it seems it is only viable for the authorization_code grant type. Disregard.