<?php

/**
 * Implement this interface to specify where the OAuth2 Server
 * should get/save access tokens
 *
 * @author Brent Shaffer <bshafs at gmail dot com>
 */
interface OAuth2_Storage_AccessTokenInterface
{
    /**
     * Look up the supplied oauth_token from storage.
     *
     * We need to retrieve access token data as we create and verify tokens.
     *
     * @param $oauth_token
     * oauth_token to be check with.
     *
     * @return
     * An associative array as below, and return NULL if the supplied oauth_token
     * is invalid:
     * - client_id: Stored client identifier.
     * - expires: Stored expiration in unix timestamp.
     * - scope: (optional) Stored scope values in space-separated string.
     *
     * @ingroup oauth2_section_7
     */
    public function getAccessToken($oauth_token);

    /**
     * Store the supplied access token values to storage.
     *
     * We need to store access token data as we create and verify tokens.
     *
     * @param $oauth_token
     * oauth_token to be stored.
     * @param $client_id
     * Client identifier to be stored.
     * @param $user_id
     * User identifier to be stored.
     * @param int $expires
     * Expiration to be stored as a Unix timestamp.
     * @param string $scope
     * (optional) Scopes to be stored in space-separated string.
     *
     * @ingroup oauth2_section_4
     */
    public function setAccessToken($oauth_token, $client_id, $user_id, $expires, $scope = null);
}
