<?php

namespace local_learnwise\local\OAuth2\Storage;

/**
 * Implement this interface to specify where the OAuth2 Server
 * should get/save authorization codes for the "Authorization Code"
 * grant type
 *
 * @author Brent Shaffer <bshafs at gmail dot com>
 */
interface AuthorizationCodeInterface
{
    /**
     * The Authorization Code grant type supports a response type of "code".
     *
     * @var string
     * @see http://tools.ietf.org/html/rfc6749#section-1.4.1
     * @see http://tools.ietf.org/html/rfc6749#section-4.2
     */
    const RESPONSE_TYPE_CODE = "code";

    /**
     * Fetch authorization code data (probably the most common grant type).
     *
     * Retrieve the stored data for the given authorization code.
     *
     * Required for OAuth2::GRANT_TYPE_AUTH_CODE.
     *
     * @param $code
     * Authorization code to be check with.
     *
     * @return
     * An associative array as below, and NULL if the code is invalid
     * @code
     * return array(
     *     "client_id"    => CLIENT_ID,      // REQUIRED Stored client identifier
     *     "user_id"      => USER_ID,        // REQUIRED Stored user identifier
     *     "expires"      => EXPIRES,        // REQUIRED Stored expiration in unix timestamp
     *     "redirect_uri" => REDIRECT_URI,   // REQUIRED Stored redirect URI
     *     "scope"        => SCOPE,          // OPTIONAL Stored scope values in space-separated string
     * );
     * @endcode
     *
     * @see http://tools.ietf.org/html/rfc6749#section-4.1
     *
     * @ingroup oauth2_section_4
     */
    public function getAuthorizationCode($code);

    /**
     * Take the provided authorization code values and store them somewhere.
     *
     * This function should be the storage counterpart to getAuthCode().
     *
     * If storage fails for some reason, we're not currently checking for
     * any sort of success/failure, so you should bail out of the script
     * and provide a descriptive fail message.
     *
     * Required for OAuth2::GRANT_TYPE_AUTH_CODE.
     *
     * @param string $code         - Authorization code to be stored.
     * @param mixed  $client_id    - Client identifier to be stored.
     * @param mixed  $user_id      - User identifier to be stored.
     * @param string $redirect_uri - Redirect URI(s) to be stored in a space-separated string.
     * @param int    $expires      - Expiration to be stored as a Unix timestamp.
     * @param string $scope        - OPTIONAL Scopes to be stored in space-separated string.
     *
     * @ingroup oauth2_section_4
     */
    public function setAuthorizationCode($code, $client_id, $user_id, $redirect_uri, $expires, $scope = null);

    /**
     * once an Authorization Code is used, it must be expired
     *
     * @see http://tools.ietf.org/html/rfc6749#section-4.1.2
     *
     *    The client MUST NOT use the authorization code
     *    more than once.  If an authorization code is used more than
     *    once, the authorization server MUST deny the request and SHOULD
     *    revoke (when possible) all tokens previously issued based on
     *    that authorization code
     *
     */
    public function expireAuthorizationCode($code);
}
