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Edit File: ResponseHeaderBag.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * ResponseHeaderBag is a container for Response HTTP headers.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class ResponseHeaderBag extends HeaderBag
{
    const COOKIES_FLAT = 'flat';
    const COOKIES_ARRAY = 'array';

const DISPOSITION_ATTACHMENT = 'attachment';
    const DISPOSITION_INLINE = 'inline';

protected $computedCacheControl = [];
    protected $cookies = [];
    protected $headerNames = [];

public function __construct(array $headers = [])
    {
        parent::__construct($headers);

if (!isset($this->headers['cache-control'])) {
            $this->set('Cache-Control', '');
        }

/* RFC2616 - 14.18 says all Responses need to have a Date */
        if (!isset($this->headers['date'])) {
            $this->initDate();
        }
    }

/**
     * Returns the headers, with original capitalizations.
     *
     * @return array An array of headers
     */
    public function allPreserveCase()
    {
        $headers = [];
        foreach ($this->all() as $name => $value) {
            $headers[isset($this->headerNames[$name]) ? $this->headerNames[$name] : $name] = $value;
        }

return $headers;
    }

public function allPreserveCaseWithoutCookies()
    {
        $headers = $this->allPreserveCase();
        if (isset($this->headerNames['set-cookie'])) {
            unset($headers[$this->headerNames['set-cookie']]);
        }

return $headers;
    }

/**
     * {@inheritdoc}
     */
    public function replace(array $headers = [])
    {
        $this->headerNames = [];

parent::replace($headers);

if (!isset($this->headers['cache-control'])) {
            $this->set('Cache-Control', '');
        }

if (!isset($this->headers['date'])) {
            $this->initDate();
        }
    }

/**
     * {@inheritdoc}
     */
    public function all()
    {
        $headers = parent::all();
        foreach ($this->getCookies() as $cookie) {
            $headers['set-cookie'][] = (string) $cookie;
        }

return $headers;
    }

/**
     * {@inheritdoc}
     */
    public function set($key, $values, $replace = true)
    {
        $uniqueKey = str_replace('_', '-', strtolower($key));

if ('set-cookie' === $uniqueKey) {
            if ($replace) {
                $this->cookies = [];
            }
            foreach ((array) $values as $cookie) {
                $this->setCookie(Cookie::fromString($cookie));
            }
            $this->headerNames[$uniqueKey] = $key;

return;
        }

$this->headerNames[$uniqueKey] = $key;

parent::set($key, $values, $replace);

// ensure the cache-control header has sensible defaults
        if (\in_array($uniqueKey, ['cache-control', 'etag', 'last-modified', 'expires'], true)) {
            $computed = $this->computeCacheControlValue();
            $this->headers['cache-control'] = [$computed];
            $this->headerNames['cache-control'] = 'Cache-Control';
            $this->computedCacheControl = $this->parseCacheControl($computed);
        }
    }

/**
     * {@inheritdoc}
     */
    public function remove($key)
    {
        $uniqueKey = str_replace('_', '-', strtolower($key));
        unset($this->headerNames[$uniqueKey]);

if ('set-cookie' === $uniqueKey) {
            $this->cookies = [];

return;
        }

parent::remove($key);

if ('cache-control' === $uniqueKey) {
            $this->computedCacheControl = [];
        }

if ('date' === $uniqueKey) {
            $this->initDate();
        }
    }

/**
     * {@inheritdoc}
     */
    public function hasCacheControlDirective($key)
    {
        return \array_key_exists($key, $this->computedCacheControl);
    }

/**
     * {@inheritdoc}
     */
    public function getCacheControlDirective($key)
    {
        return \array_key_exists($key, $this->computedCacheControl) ? $this->computedCacheControl[$key] : null;
    }

public function setCookie(Cookie $cookie)
    {
        $this->cookies[$cookie->getDomain()][$cookie->getPath()][$cookie->getName()] = $cookie;
        $this->headerNames['set-cookie'] = 'Set-Cookie';
    }

/**
     * Removes a cookie from the array, but does not unset it in the browser.
     *
     * @param string $name
     * @param string $path
     * @param string $domain
     */
    public function removeCookie($name, $path = '/', $domain = null)
    {
        if (null === $path) {
            $path = '/';
        }

unset($this->cookies[$domain][$path][$name]);

if (empty($this->cookies[$domain][$path])) {
            unset($this->cookies[$domain][$path]);

if (empty($this->cookies[$domain])) {
                unset($this->cookies[$domain]);
            }
        }

if (empty($this->cookies)) {
            unset($this->headerNames['set-cookie']);
        }
    }

/**
     * Returns an array with all cookies.
     *
     * @param string $format
     *
     * @return Cookie[]
     *
     * @throws \InvalidArgumentException When the $format is invalid
     */
    public function getCookies($format = self::COOKIES_FLAT)
    {
        if (!\in_array($format, [self::COOKIES_FLAT, self::COOKIES_ARRAY])) {
            throw new \InvalidArgumentException(sprintf('Format "%s" invalid (%s).', $format, implode(', ', [self::COOKIES_FLAT, self::COOKIES_ARRAY])));
        }

if (self::COOKIES_ARRAY === $format) {
            return $this->cookies;
        }

$flattenedCookies = [];
        foreach ($this->cookies as $path) {
            foreach ($path as $cookies) {
                foreach ($cookies as $cookie) {
                    $flattenedCookies[] = $cookie;
                }
            }
        }

return $flattenedCookies;
    }

/**
     * Clears a cookie in the browser.
     *
     * @param string $name
     * @param string $path
     * @param string $domain
     * @param bool   $secure
     * @param bool   $httpOnly
     * @param string $sameSite
     */
    public function clearCookie($name, $path = '/', $domain = null, $secure = false, $httpOnly = true/*, $sameSite = null*/)
    {
        $sameSite = \func_num_args() > 5 ? func_get_arg(5) : null;

$this->setCookie(new Cookie($name, null, 1, $path, $domain, $secure, $httpOnly, false, $sameSite));
    }

/**
     * Generates a HTTP Content-Disposition field-value.
     *
     * @param string $disposition      One of "inline" or "attachment"
     * @param string $filename         A unicode string
     * @param string $filenameFallback A string containing only ASCII characters that
     *                                 is semantically equivalent to $filename. If the filename is already ASCII,
     *                                 it can be omitted, or just copied from $filename
     *
     * @return string A string suitable for use as a Content-Disposition field-value
     *
     * @throws \InvalidArgumentException
     *
     * @see RFC 6266
     */
    public function makeDisposition($disposition, $filename, $filenameFallback = '')
    {
        if (!\in_array($disposition, [self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE])) {
            throw new \InvalidArgumentException(sprintf('The disposition must be either "%s" or "%s".', self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE));
        }

if ('' == $filenameFallback) {
            $filenameFallback = $filename;
        }

// filenameFallback is not ASCII.
        if (!preg_match('/^[\x20-\x7e]*$/', $filenameFallback)) {
            throw new \InvalidArgumentException('The filename fallback must only contain ASCII characters.');
        }

// percent characters aren't safe in fallback.
        if (false !== strpos($filenameFallback, '%')) {
            throw new \InvalidArgumentException('The filename fallback cannot contain the "%" character.');
        }

// path separators aren't allowed in either.
        if (false !== strpos($filename, '/') || false !== strpos($filename, '\\') || false !== strpos($filenameFallback, '/') || false !== strpos($filenameFallback, '\\')) {
            throw new \InvalidArgumentException('The filename and the fallback cannot contain the "/" and "\\" characters.');
        }

$output = sprintf('%s; filename="%s"', $disposition, str_replace('"', '\\"', $filenameFallback));

if ($filename !== $filenameFallback) {
            $output .= sprintf("; filename*=utf-8''%s", rawurlencode($filename));
        }

return $output;
    }

/**
     * Returns the calculated value of the cache-control header.
     *
     * This considers several other headers and calculates or modifies the
     * cache-control header to a sensible, conservative value.
     *
     * @return string
     */
    protected function computeCacheControlValue()
    {
        if (!$this->cacheControl) {
            if ($this->has('Last-Modified') || $this->has('Expires')) {
                return 'private, must-revalidate'; // allows for heuristic expiration (RFC 7234 Section 4.2.2) in the case of "Last-Modified"
            }

// conservative by default
            return 'no-cache, private';
        }

$header = $this->getCacheControlHeader();
        if (isset($this->cacheControl['public']) || isset($this->cacheControl['private'])) {
            return $header;
        }

// public if s-maxage is defined, private otherwise
        if (!isset($this->cacheControl['s-maxage'])) {
            return $header.', private';
        }

return $header;
    }

private function initDate()
    {
        $now = \DateTime::createFromFormat('U', time());
        $now->setTimezone(new \DateTimeZone('UTC'));
        $this->set('Date', $now->format('D, d M Y H:i:s').' GMT');
    }
}