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<?php

namespace OAuth2;

use OAuth2\Model\IOAuth2Client;

/**
 * Storage engines that support the "Resource Owner Password Credentials" grant type should implement this interface
 *
 * @author Dave Rochwerger <[email protected]>
 *         
 * @see    http://tools.ietf.org/html/draft-ietf-oauth-v2-20#section-4.3
 */
interface IOAuth2GrantUser extends IOAuth2Storage
{
    /**
     * Grant access tokens for basic user credentials.
     *
     * Check the supplied username and password for validity.
     * You can also use the $client param to do any checks required based on a client, if you need that.
     * Required for OAuth2::GRANT_TYPE_USER_CREDENTIALS.
     *
     * @param IOAuth2Client $client   Client to check.
     * @param string        $username Username to check.
     * @param string        $password Password to check.
     *
     * @return bool|array Returns true if the username and password are valid or false if they aren't.
     * Moreover, if the username and password are valid, and you want to
     * verify the scope of a user's access, return an associative array
     * with the scope values as below. We'll check the scope you provide
     * against the requested scope before providing an access token:
     * @code
     * return array(
     *     'scope' => <stored scope values (space-separated string)>,
     * );
     * @endcode
     *
     * @see     http://tools.ietf.org/html/draft-ietf-oauth-v2-20#section-4.3
     *
     * @ingroup oauth2_section_4
     */
    public function checkUserCredentials(IOAuth2Client $client, $username, $password);
}