<?php

namespace Lexik\Bundle\JWTAuthenticationBundle\TokenExtractor;

use Symfony\Component\HttpFoundation\Request;

/**
 * AuthorizationHeaderTokenExtractor.
 *
 * @author Nicolas Cabot <n.cabot@lexik.fr>
 */
class AuthorizationHeaderTokenExtractor implements TokenExtractorInterface
{
    /**
     * @var string
     */
    protected $prefix;

    /**
     * @var string
     */
    protected $name;

    /**
     * @param string|null $prefix
     * @param string      $name
     */
    public function __construct($prefix, $name)
    {
        $this->prefix = $prefix;
        $this->name = $name;
    }

    /**
     * {@inheritdoc}
     */
    public function extract(Request $request)
    {
        if (!$request->headers->has($this->name)) {
            return false;
        }

        $authorizationHeader = $request->headers->get($this->name);

        if (empty($this->prefix)) {
            return $authorizationHeader;
        }

        $headerParts = explode(' ', (string) $authorizationHeader);

        if (!(2 === count($headerParts) && 0 === strcasecmp($headerParts[0], $this->prefix))) {
            return false;
        }

        return $headerParts[1];
    }
}