vendor/bshaffer/oauth2-server-php/src/OAuth2/Controller/TokenController.php

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<?php

namespace OAuth2\Controller;

use OAuth2\ResponseType\AccessTokenInterface;
use OAuth2\ClientAssertionType\ClientAssertionTypeInterface;
use OAuth2\GrantType\GrantTypeInterface;
use OAuth2\ScopeInterface;
use OAuth2\Scope;
use OAuth2\Storage\ClientInterface;
use OAuth2\RequestInterface;
use OAuth2\ResponseInterface;

/**
 * @see \OAuth2\Controller\TokenControllerInterface
 */
class TokenController implements TokenControllerInterface
{
    /**
     * @var AccessTokenInterface
     */
    protected $accessToken;

    /**
     * @var array
     */
    protected $grantTypes;

    /**
     * @var ClientAssertionTypeInterface
     */
    protected $clientAssertionType;

    /**
     * @var Scope|ScopeInterface
     */
    protected $scopeUtil;

    /**
     * @var ClientInterface
     */
    protected $clientStorage;

    public function __construct(AccessTokenInterface $accessToken, ClientInterface $clientStorage, array $grantTypes = array(), ClientAssertionTypeInterface $clientAssertionType = null, ScopeInterface $scopeUtil = null)
    {
        if (is_null($clientAssertionType)) {
            foreach ($grantTypes as $grantType) {
                if (!$grantType instanceof ClientAssertionTypeInterface) {
                    throw new \InvalidArgumentException('You must supply an instance of OAuth2\ClientAssertionType\ClientAssertionTypeInterface or only use grant types which implement OAuth2\ClientAssertionType\ClientAssertionTypeInterface');
                }
            }
        }
        $this->clientAssertionType = $clientAssertionType;
        $this->accessToken = $accessToken;
        $this->clientStorage = $clientStorage;
        foreach ($grantTypes as $grantType) {
            $this->addGrantType($grantType);
        }

        if (is_null($scopeUtil)) {