Headers.php

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<?php
namespace Slim\Http;
 
use Slim\Collection;
use Slim\Interfaces\Http\HeadersInterface;
 
class Headers extends Collection implements HeadersInterface
{
    protected static $special = [
        'CONTENT_TYPE' => 1,
        'CONTENT_LENGTH' => 1,
        'PHP_AUTH_USER' => 1,
        'PHP_AUTH_PW' => 1,
        'PHP_AUTH_DIGEST' => 1,
        'AUTH_TYPE' => 1,
    ];
 
    public static function createFromEnvironment(Environment $environment)
    {
        $data = [];
        $environment = self::determineAuthorization($environment);
        foreach ($environment as $key => $value) {
            $key = strtoupper($key);
            if (isset(static::$special[$key]) || strpos($key, 'HTTP_') === 0) {
                if ($key !== 'HTTP_CONTENT_LENGTH') {
                    $data[$key] =  $value;
                }
            }
        }
 
        return new static($data);
    }
 
    public static function determineAuthorization(Environment $environment)
    {
        $authorization = $environment->get('HTTP_AUTHORIZATION');
 
        if (empty($authorization) && is_callable('getallheaders')) {
            $headers = getallheaders();
            $headers = array_change_key_case($headers, CASE_LOWER);
            if (isset($headers['authorization'])) {
                $environment->set('HTTP_AUTHORIZATION', $headers['authorization']);
            }
        }
 
        return $environment;
    }
 
    public function all()
    {
        $all = parent::all();
        $out = [];
        foreach ($all as $key => $props) {
            $out[$props['originalKey']] = $props['value'];
        }
 
        return $out;
    }
 
    public function set($key, $value)
    {
        if (!is_array($value)) {
            $value = [$value];
        }
        parent::set($this->normalizeKey($key), [
            'value' => $value,
            'originalKey' => $key
        ]);
    }
 
    public function get($key, $default = null)
    {
        if ($this->has($key)) {
            return parent::get($this->normalizeKey($key))['value'];
        }
 
        return $default;
    }
 
    public function getOriginalKey($key, $default = null)
    {
        if ($this->has($key)) {
            return parent::get($this->normalizeKey($key))['originalKey'];
        }
 
        return $default;
    }
 
    public function add($key, $value)
    {
        $oldValues = $this->get($key, []);
        $newValues = is_array($value) ? $value : [$value];
        $this->set($key, array_merge($oldValues, array_values($newValues)));
    }
 
    public function has($key)
    {
        return parent::has($this->normalizeKey($key));
    }
 
    public function remove($key)
    {
        parent::remove($this->normalizeKey($key));
    }
 
    public function normalizeKey($key)
    {
        $key = strtr(strtolower($key), '_', '-');
        if (strpos($key, 'http-') === 0) {
            $key = substr($key, 5);
        }
 
        return $key;
    }
}