Provider.php

<?php

namespace SocialiteProviders\Deviantart;

use GuzzleHttp\RequestOptions;
use SocialiteProviders\Manager\OAuth2\AbstractProvider;
use SocialiteProviders\Manager\OAuth2\User;

class Provider extends AbstractProvider
{
    public const IDENTIFIER = 'DEVIANTART';

    protected $scopes = ['basic'];

    protected $usesPKCE = true;

    protected function getAuthUrl($state): string
    {
        return $this->buildAuthUrlFromBase('https://www.deviantart.com/oauth2/authorize', $state);
    }

    protected function getTokenUrl(): string
    {
        return 'https://www.deviantart.com/oauth2/token';
    }

    /**
     * {@inheritdoc}
     */
    protected function getUserByToken($token)
    {
        $response = $this->getHttpClient()->get('https://www.deviantart.com/api/v1/oauth2/user/whoami', [
            RequestOptions::HEADERS => [
                'Authorization' => 'Bearer '.$token,
            ],
            RequestOptions::QUERY => [
                'access_token' => $token,
            ],
        ]);

        return json_decode((string) $response->getBody(), true);
    }

    /**
     * {@inheritdoc}
     */
    protected function mapUserToObject(array $user)
    {
        return (new User)->setRaw($user)->map([
            'id'   => $user['userid'], 'nickname' => $user['username'],
            'name' => null, 'email' => null, 'avatar' => $user['usericon'],
        ]);
    }
}