A driver for traditional CGI

[knut-forkalsrud]

When I recently moved my stuff to a new laptop I didn't want to install Apache. Valet covers my development environment needs, except for the occasional CGI script. It turns out Nginx doesn't have builtin (traditional) CGI support, only FastCGI. I'm not very proficient in PHP, but I took a stab at implementing a custom driver that would provide basic CGI support. What I ended up with is most likely not great, but I'll share it here. It may even make sense as a built-in feature for Valet.

First my custom driver in ~/.config/valet/Drivers/CgiValetDriver.php:

class CgiValetDriver extends ValetDriver
{
    public function serves($sitePath, $siteName, $uri)
    {
        return is_executable($sitePath.$uri) && preg_match("/\.cgi(\?.*)?$/", $uri);
    }

    public function isStaticFile($sitePath, $siteName, $uri)
    {
        return false;
    }

    public function frontControllerPath($sitePath, $siteName, $uri)
    {
        return __DIR__."/cgi.php";
    }
}

It delegates to my cgi.php in the same directory:

<?php

$descriptorspec = array(
   0 => array("pipe", "r"),
   1 => array("pipe", "w+b"),
   2 => fopen('php://stderr', 'w+b')
);


$executable = $valetSitePath."/".$uri;
$cwd = $valetSitePath;
$env = $_SERVER;

$process = proc_open($executable, $descriptorspec, $pipes, $cwd, $env);

if (is_resource($process)) {

    stream_copy_to_stream(fopen('php://input', 'r'), $pipes[0]);
    fclose($pipes[0]);

    while (($line = trim(fgets($pipes[1]))) !== false) {
        if (empty($line)) {
            break;
        }
        header($line);
    }
    stream_copy_to_stream($pipes[1], fopen('php://output', 'w+b'));
    fclose($pipes[1]);
    $return_value = proc_close($process);
}

?>

I tried my best to search for existing solutions, without much luck. Comments/criticism welcome!