Add initial proof-of-concept

.gitignore

@@ -0,0 +1 @@
+vendor

bin/orbit

@@ -0,0 +1,105 @@
+#!/usr/bin/env php
+<?php
+
+// Certificate data:
+$dn = array(
+    "countryName" => "UK",
+    "stateOrProvinceName" => "Somerset",
+    "localityName" => "Glastonbury",
+    "organizationName" => "The Brain Room Limited",
+    "organizationalUnitName" => "PHP Documentation Team",
+    "commonName" => "Wez Furlong",
+    "emailAddress" => "wez@example.com"
+);
+
+// Generate certificate
+$privkey = openssl_pkey_new();
+$cert    = openssl_csr_new($dn, $privkey);
+$cert    = openssl_csr_sign($cert, null, $privkey, 365);
+
+// Generate PEM file
+# Optionally change the passphrase from 'comet' to whatever you want, or leave it empty for no passphrase
+$pem_passphrase = 'comet';
+$pem = array();
+openssl_x509_export($cert, $pem[0]);
+openssl_pkey_export($privkey, $pem[1], $pem_passphrase);
+$pem = implode($pem);
+
+// Save PEM file
+$pemfile = './server.pem';
+file_put_contents($pemfile, $pem);
+
+$context = stream_context_create();
+
+// local_cert must be in PEM format
+stream_context_set_option($context, 'ssl', 'local_cert', $pemfile);
+// Pass Phrase (password) of private key
+stream_context_set_option($context, 'ssl', 'passphrase', $pem_passphrase);
+
+stream_context_set_option($context, 'ssl', 'allow_self_signed', true);
+stream_context_set_option($context, 'ssl', 'verify_peer', false);
+
+// Create the server socket
+$server = stream_socket_server('ssl://0.0.0.0:1965', $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN, $context);
+
+while (true) {
+    //$buffer = '';
+    print "waiting...";
+    $client = @stream_socket_accept($server);
+
+    if ($client) {
+        print "accepted " . stream_socket_get_name($client, true) . "\n";
+        $request = stream_get_line($client, 1024, "\r\n");
+        // Read until CRLF
+        //while(!preg_match('/\r\n/', $buffer) )
+        //    $buffer .= fread($client, 2046);
+        print(View::hexView($request));
+
+        // Respond to client
+        $response = implode("\r\n", ['20 text/gemini', 'Thanks for all the fish']);
+        fwrite($client,  $response);
+        fclose($client);
+    } else {
+        print "error.\n";
+    }
+}
+
+class View
+{
+    /**
+     * View hex chars of string
+     *
+     * Outputs a listing of hexidecimal values in 16 byte rows
+     *
+     * @param mixed $text Input text
+     * @return string
+     */
+    public static function hexView($text)
+    {
+        $num            = 16;
+        $outStr         = '';
+        $printableChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+            . 'abcdefghijklmnopqrstuvwxyz'
+            . '0123456789~!@#$%^&*()_+-={}|[]\:";\'<>?,./';
+
+        $charCount = strlen($text);
+        for ($i = 0; $i < $charCount; $i += $num) {
+            $printStr = '';
+            for ($j = 0; $j < $num; $j++) {
+                $char = substr($text, $i+$j, 1);
+
+                $outStr .= sprintf("%02X", ord($char)) . " ";
+
+                if (ord($char) >= 32 && ord($char) < 127) {
+                    $printStr .= $char;
+                } else {
+                    $printStr .= ".";
+                }
+            }
+
+            $outStr .= " | " . $printStr . "\n";
+        }
+
+        return $outStr;
+    }
+}