PHP Gemini Client

gemini.php

<?php

// This is a simple PHP script that can be used to fetch a Gemini URL and return the contents.

// Example usage:

try {
    echo gemini_get_contents('gemini://gemini.circumlunar.space');
} catch(Exception $e) {
    echo $e->getMessage();
}


function gemini_get_contents($url, $redirectIndex = 0){
    if($redirectIndex > 5){
        throw new Exception("Too many redirects.");
    }
    $hostname = parse_url($url, PHP_URL_HOST);
    $port = parse_url($url, PHP_URL_PORT);
    if (!$port) {
        $port = 1965;
    }
    $context = stream_context_create(['ssl' => ['verify_peer' => false]]);
    $socket = stream_socket_client('ssl://' . $hostname . ':' . $port, $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $context);
    if (!$socket) {
        throw new Exception("$errstr ($errno)");
    }
    $request = $url . "\r\n";
    fwrite($socket, $request);
    $response = '';
    while (!feof($socket)) {
        $data = fgets($socket);
        $response .= $data;
    }
    $status_code = substr($response, 0, 2);
    switch($status_code){
        case 10:
        case 11:
            throw new Exception("Server requested input. Not supported.");
            break;
        case 20:
            $response = substr($response, strpos($response, "\n")+1);
            break;
        case 30:
        case 31:
            $url = substr($response, 3, -2);
            return gemini_get_contents($url, $redirectIndex + 1);
            break;
        case 40:
            throw new Exception("Temporary failure.");
            break;
        case 41:
            throw new Exception("Server unavailable.");
            break;
        case 42:
            throw new Exception("CGI error.");
            break;
        case 43:
            throw new Exception("Proxy error.");
            break;
        case 44:
            throw new Exception("Slow down.");
            break;
        case 50:
            throw new Exception("Permanent failure.");
            break;
        case 51:
            throw new Exception("Not found.");
            break;
        case 52:
            throw new Exception("Gone.");
            break;
        case 53:
            throw new Exception("Proxy request refused.");
            break;
        case 59:
            throw new Exception("Bad request.");
            break;
        case 60:
            throw new Exception("Client certificate required.");
            break;
        case 61:
            throw new Exception("Certificate not authorized.");
            break;
        case 62:
            throw new Exception("Certificate not valid.");
            break;
        default:
            throw new Exception("Invalid response code.");
            break;
    }
    fclose($socket);
    return $response;
}


?>