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✏️ Editing: marshal_uri_from_sapi.php

<?php

declare(strict_types=1);

namespace Laminas\Diactoros;

use function array_change_key_case;
use function array_key_exists;
use function explode;
use function implode;
use function is_array;
use function ltrim;
use function preg_match;
use function preg_replace;
use function strlen;
use function strpos;
use function strtolower;
use function substr;

/**
 * Marshal a Uri instance based on the values presnt in the $_SERVER array and headers.
 *
 * @param array $server SAPI parameters
 * @param array $headers HTTP request headers
 */
function marshalUriFromSapi(array $server, array $headers) : Uri
{
    /**
     * Retrieve a header value from an array of headers using a case-insensitive lookup.
     *
     * @param array $headers Key/value header pairs
     * @param mixed $default Default value to return if header not found
     * @return mixed
     */
    $getHeaderFromArray = function (string $name, array $headers, $default = null) {
        $header  = strtolower($name);
        $headers = array_change_key_case($headers, CASE_LOWER);
        if (array_key_exists($header, $headers)) {
            $value = is_array($headers[$header]) ? implode(', ', $headers[$header]) : $headers[$header];
            return $value;
        }

return $default;
    };

/**
     * Marshal the host and port from HTTP headers and/or the PHP environment.
     *
     * @return array Array of two items, host and port, in that order (can be
     *     passed to a list() operation).
     */
    $marshalHostAndPort = function (array $headers, array $server) use ($getHeaderFromArray) : array {
        /**
        * @param string|array $host
        * @return array Array of two items, host and port, in that order (can be
        *     passed to a list() operation).
        */
        $marshalHostAndPortFromHeader = function ($host) {
            if (is_array($host)) {
                $host = implode(', ', $host);
            }

$port = null;

// works for regname, IPv4 & IPv6
            if (preg_match('|\:(\d+)$|', $host, $matches)) {
                $host = substr($host, 0, -1 * (strlen($matches[1]) + 1));
                $port = (int) $matches[1];
            }

return [$host, $port];
        };

/**
        * @return array Array of two items, host and port, in that order (can be
        *     passed to a list() operation).
        */
        $marshalIpv6HostAndPort = function (array $server, ?int $port) : array {
            $host = '[' . $server['SERVER_ADDR'] . ']';
            $port = $port ?: 80;
            if ($port . ']' === substr($host, strrpos($host, ':') + 1)) {
                // The last digit of the IPv6-Address has been taken as port
                // Unset the port so the default port can be used
                $port = null;
            }
            return [$host, $port];
        };

static $defaults = ['', null];

$forwardedHost = $getHeaderFromArray('x-forwarded-host', $headers, false);
        if ($forwardedHost !== false) {
            return $marshalHostAndPortFromHeader($forwardedHost);
        }

$host = $getHeaderFromArray('host', $headers, false);
        if ($host !== false) {
            return $marshalHostAndPortFromHeader($host);
        }

if (! isset($server['SERVER_NAME'])) {
            return $defaults;
        }

$host = $server['SERVER_NAME'];
        $port = isset($server['SERVER_PORT']) ? (int) $server['SERVER_PORT'] : null;

if (! isset($server['SERVER_ADDR'])
            || ! preg_match('/^\[[0-9a-fA-F\:]+\]$/', $host)
        ) {
            return [$host, $port];
        }

// Misinterpreted IPv6-Address
        // Reported for Safari on Windows
        return $marshalIpv6HostAndPort($server, $port);
    };

/**
     * Detect the path for the request
     *
     * Looks at a variety of criteria in order to attempt to autodetect the base
     * request path, including:
     *
     * - IIS7 UrlRewrite environment
     * - REQUEST_URI
     * - ORIG_PATH_INFO
     *
     * From Laminas\Http\PhpEnvironment\Request class
     */
    $marshalRequestPath = function (array $server) : string {
        // IIS7 with URL Rewrite: make sure we get the unencoded url
        // (double slash problem).
        $iisUrlRewritten = $server['IIS_WasUrlRewritten'] ?? null;
        $unencodedUrl    = $server['UNENCODED_URL'] ?? '';
        if ('1' === $iisUrlRewritten && ! empty($unencodedUrl)) {
            return $unencodedUrl;
        }

$requestUri = $server['REQUEST_URI'] ?? null;

if ($requestUri !== null) {
            return preg_replace('#^[^/:]+://[^/]+#', '', $requestUri);
        }

$origPathInfo = $server['ORIG_PATH_INFO'] ?? null;
        if (empty($origPathInfo)) {
            return '/';
        }

return $origPathInfo;
    };

$uri = new Uri('');

// URI scheme
    $scheme = 'http';
    $marshalHttpsValue = function ($https) : bool {
        if (is_bool($https)) {
            return $https;
        }

if (! is_string($https)) {
            throw new Exception\InvalidArgumentException(sprintf(
                'SAPI HTTPS value MUST be a string or boolean; received %s',
                gettype($https)
            ));
        }

return 'on' === strtolower($https);
    };
    if (array_key_exists('HTTPS', $server)) {
        $https = $marshalHttpsValue($server['HTTPS']);
    } elseif (array_key_exists('https', $server)) {
        $https = $marshalHttpsValue($server['https']);
    } else {
        $https = false;
    }

if ($https
        || strtolower($getHeaderFromArray('x-forwarded-proto', $headers, '')) === 'https'
    ) {
        $scheme = 'https';
    }
    $uri = $uri->withScheme($scheme);

// Set the host
    [$host, $port] = $marshalHostAndPort($headers, $server);
    if (! empty($host)) {
        $uri = $uri->withHost($host);
        if (! empty($port)) {
            $uri = $uri->withPort($port);
        }
    }

// URI path
    $path = $marshalRequestPath($server);

// Strip query string
    $path = explode('?', $path, 2)[0];

// URI query
    $query = '';
    if (isset($server['QUERY_STRING'])) {
        $query = ltrim($server['QUERY_STRING'], '?');
    }

// URI fragment
    $fragment = '';
    if (strpos($path, '#') !== false) {
        [$path, $fragment] = explode('#', $path, 2);
    }

return $uri
        ->withPath($path)
        ->withFragment($fragment)
        ->withQuery($query);
}

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