Parse HTTP Request in PHP

parse_http_request.php

<?php

function parse_http_request(string $request): array
{
    [$rawHeaders, $rawBody] = mb_split('\r\n\r\n', $request, 2);

    $rawHeaders = mb_split('\r\n', $rawHeaders);

    $requestLine = array_shift($rawHeaders);

    [$method, $path, $protocol] = mb_split(' ', $requestLine, 3);

    $headers = [];

    foreach ($rawHeaders as $rawHeader) {
        [$key, $value] = mb_split(':', $rawHeader, 2);

        if ( ! $key || ! $value) {
            continue;
        }

        $key = mb_trim($key);

        $key = mb_strtolower($key);

        if ( ! isset($headers[$key])) {
            $headers[$key] = [];
        }

        $headers[$key][] = mb_trim($value);
    }

    $contentType = $headers['content-type'][0] ?? 'application/octet-stream';

    if (mb_stripos($contentType, 'application/x-www-form-urlencoded') !== false) {
        $body = [];

        $pairs = mb_split('&', $rawBody);

        foreach ($pairs as $pair) {
            if (mb_stripos($pair, '=') !== false) {
                [$key, $value] = mb_split('=', $pair, 2);

                $body[urldecode($key)] = urldecode($value);
            }
        }
    } elseif (mb_stripos($contentType, 'multipart/form-data') !== false) {
        $body = [];

        $boundary = preg_match('/boundary=(.*)$/', $contentType, $matches) ? $matches[1] : '';

        if ($boundary) {
            $blocks = mb_split('--' . $boundary, $rawBody);

            foreach ($blocks as $block) {
                $block = mb_trim($block);

                if ( ! $block || $block === '--') {
                    continue;
                }

                [$blockHeaders, $blockBody] = mb_split('\r\n\r\n', $block, 2);

                if ( ! $blockHeaders || ! $blockBody) {
                    continue;
                }

                preg_match(
                    '/Content-Disposition: form-data; name="([^"]+)"(?:; filename="([^"]+)")?/', $blockHeaders,
                    $matches,
                );

                if ( ! $matches) {
                    continue;
                }

                $name = $matches[1] ?? null;

                if ( ! $name) {
                    continue;
                }

                $filename = $matches[2] ?? null;

                if ($filename) {
                    preg_match('/Content-Type: ([a-zA-Z0-9\-\/]+)/', $blockHeaders, $mimeMatches);

                    $tmpFile = tempnam(sys_get_temp_dir(), 'php');

                    $body[$name] = [
                        'name' => $filename,
                        'type' => $mimeMatches[1] ?? 'application/octet-stream',
                        'tmp_name' => $tmpFile,
                        'error' => UPLOAD_ERR_OK,
                        'size' => mb_strlen($blockBody),
                    ];

                    file_put_contents($tmpFile, $blockBody);
                } else {
                    $body[$name] = mb_trim($blockBody);
                }
            }
        }
    } elseif (mb_stripos($contentType, 'application/json') !== false) {
        $body = json_decode($rawBody, true) ?? [];
    } else {
        $body = $rawBody;
    }

    return compact('method', 'path', 'protocol', 'headers', 'body');
}

/**
 * Parsing URL-encoded Form.
 *
 * @example
 *    [
 *     "method" => "POST",
 *     "path" => "/users",
 *     "protocol" => "HTTP/1.1",
 *     "headers" => [
 *       "host" => [
 *         "example.com",
 *       ],
 *       "content-type" => [
 *         "application/x-www-form-urlencoded",
 *       ],
 *     ],
 *     "body" => [
 *       "name" => "Jane Doe",
 *       "age" => "25"
 *     ],
 *   ]
 */
parse_http_request(
    <<<FORM
    POST /users HTTP/1.1\r
    Host: example.com\r
    Content-Type: application/x-www-form-urlencoded\r
    \r
    name=Jane%20Doe&age=25
    FORM,
);


/**
 * Parsing JSON body.
 *
 * @example
 *    [
 *     "method" => "POST",
 *     "path" => "/users",
 *     "protocol" => "HTTP/1.1",
 *     "headers" => [
 *       "host" => [
 *         "example.com",
 *       ],
 *       "content-type" => [
 *         "application/json",
 *       ],
 *     ],
 *     "body" => [
 *       "name" => "John Doe",
 *       "age" => 24
 *     ],
 *   ]
 */
parse_http_request(
    <<<JSON
    POST /users HTTP/1.1\r
    Host: example.com\r
    Content-Type: application/json\r
    \r
    {"name":"John Doe","age":24}
    JSON,
);

/**
 * Parsing Multipart Form Data.
 *
 * @example
 *    [
 *     "method" => "POST",
 *     "path" => "/users",
 *     "protocol" => "HTTP/1.1",
 *     "headers" => [
 *       "host" => [
 *         "example.com",
 *       ],
 *       "content-type" => [
 *         "multipart/form-data; boundary=boundary123",
 *       ],
 *     ],
 *     "body" => [
 *       "name" => "Bad Doe",
 *       "age" => "26",
 *       "secret" => [
 *         "name" => "secret.txt",
 *         "type" => "text/plain",
 *         "tmp_name" => "/private/var/folders/fd/wjmd6ylx3zqczr6ptpvgfbw00000gp/T/php2pqSS9",
 *         "error" => 0,
 *         "size" => 12,
 *       ],
 *     ],
 *   ]
 */
parse_http_request(
    <<<MULTIPART
    POST /users HTTP/1.1\r
    Host: example.com\r
    Content-Type: multipart/form-data; boundary=boundary123\r
    \r
    --boundary123\r
    Content-Disposition: form-data; name="name"\r
    \r
    Bad Doe
    --boundary123\r
    Content-Disposition: form-data; name="age"\r
    \r
    25
    --boundary123\r
    Content-Disposition: form-data; name="secret"; filename="secret.txt"\r
    Content-Type: text/plain\r
    \r
    test content\r
    --boundary123--\r
    MULTIPART,
);

Peak stuff