Proyectos de Subversion LeadersLinked - Antes de SPA

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<?php
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namespace LeadersLinked\Library;
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class Facebook
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{
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    /**
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     *
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     * @var array
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     */
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    private $config;
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    /**
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     *
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     * @param array $config
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     */
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    public function __construct($config)
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    {
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        $this->config = $config;
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    }
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    /**
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     *
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     * @param string $input
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     * @return string
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     */
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    public static function base64_url_decode($input) {
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        return base64_decode(strtr($input, '-_', '+/'));
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    }
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    /**
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     *
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     * @param string $signed_request
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     * @return NULL|array
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     */
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    public function parse_signed_request($signed_request)
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    {
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        list($encoded_sig, $payload) = explode('.', $signed_request, 2);
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        $secret = $this->config['leaderslinked.facebook.app_password'];
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        // decode the data
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        $sig = self::base64_url_decode($encoded_sig);
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        $data = json_decode(self::base64_url_decode($payload), true);
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        // confirm the signature
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        $raw = true;
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        $expected_sig = hash_hmac('sha256', $payload, $secret, $raw);
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        if ($sig !== $expected_sig) {
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            error_log('Facebook Bad Signed JSON signature!');
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            return null;
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        }
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        return $data;
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    }
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}