<?php

namespace League\OAuth2\Client\Tool;

use League\OAuth2\Client\Token\AccessToken;
use League\OAuth2\Client\Token\AccessTokenInterface;

/**
 * Enables `MAC` header authorization for providers.
 *
 * @link http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-05 Message Authentication Code (MAC) Tokens
 */
trait MacAuthorizationTrait
{
    /**
     * Returns the id of this token for MAC generation.
     *
     * @param  AccessToken $token
     * @return string
     */
    abstract protected function getTokenId(AccessToken $token);

    /**
     * Returns the MAC signature for the current request.
     *
     * @param  string $id
     * @param  integer $ts
     * @param  string $nonce
     * @return string
     */
    abstract protected function getMacSignature($id, $ts, $nonce);

    /**
     * Returns a new random string to use as the state parameter in an
     * authorization flow.
     *
     * @param  int $length Length of the random string to be generated.
     * @return string
     */
    abstract protected function getRandomState($length = 32);

    /**
     * Returns the authorization headers for the 'mac' grant.
     *
     * @param  AccessTokenInterface|string|null $token Either a string or an access token instance
     * @return array
     * @codeCoverageIgnore
     *
     * @todo This is currently untested and provided only as an example. If you
     * complete the implementation, please create a pull request for
     * https://github.com/thephpleague/oauth2-client
     */
    protected function getAuthorizationHeaders($token = null)
    {
        if ($token === null) {
            return [];
        }

        $ts    = time();
        $id    = $this->getTokenId($token);
        $nonce = $this->getRandomState(16);
        $mac   = $this->getMacSignature($id, $ts, $nonce);

        $parts = [];
        foreach (compact('id', 'ts', 'nonce', 'mac') as $key => $value) {
            $parts[] = sprintf('%s="%s"', $key, $value);
        }

        return ['Authorization' => 'MAC ' . implode(', ', $parts)];
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzI4MDE1NzcyMzkxOTMzMyAzNTYwMzM2MTYzNTQwMjg0IDEzMjE4NzU1NTEwODQ0MjU=