Add directory listing feature

src/Orbit/Config.php

@@ -17,4 +17,6 @@ class Config
     public $verbose = false;
 
     public $root_dir = ".";
+    public $index_file = "index.gmi";
+    public $enable_directory_index = true;
 }

src/Orbit/Response.php

@@ -49,8 +49,12 @@ class Response
             if (false === $fp) {
                 throw new \Exception("Error reading file '{$this->filepath}'");
             }
-            while (!feof($fp)) {
-                fwrite($client, fread($fp, 8192));
+
+            $result = 1;
+            while (!feof($fp) && $result) {
+                // If the client cancels, bail out before trying large files
+                // So, result will be 0 if the client cancels (broken socket)
+                $result = fwrite($client, fread($fp, 8192));
             }
             return $size;
         } else {

src/Orbit/Server.php

@@ -131,14 +131,33 @@ class Server
             }
 
             // Check if index file exists
-            if (file_exists($resource_path . DIRECTORY_SEPARATOR . "index.gmi")) {
-                $resource_path = $resource_path . "/index.gmi";
+            if (file_exists($resource_path . DIRECTORY_SEPARATOR . $this->config->index_file)) {
+                $resource_path = $resource_path . DIRECTORY_SEPARATOR . $this->config->index_file;
+            } else {
+                if (!$this->config->enable_directory_index) {
+                    $response->setStatus(Response::STATUS_BAD_REQUEST);
+                    $response->setMeta('Path not available');
+                    return $response;
+                } else {
+                    $response->setStatus(Response::STATUS_SUCCESS);
+                    $response->setMeta('text/gemini');
+                    $response->setBody($this->makeDirectoryIndex($resource_path, $dir));
+                    return $response;
+                }
             }
         }
 
-        if (file_exists($resource_path)) {
+        // File exists and is world readable
+        if (file_exists($resource_path) && (fileperms($resource_path) & 0x0004)) {
             $response->setStatus(Response::STATUS_SUCCESS);
+
             $pathinfo = pathinfo($resource_path);
+            if (!isset($pathinfo['extension'])) {
+                $response->setStatus(Response::STATUS_TEMPORARY_FAILURE);
+                $response->setMeta('Error reading resource');
+                return $response;
+            }
+
             if ($pathinfo['extension'] == 'gmi' || $pathinfo['extension'] == 'gemini') {
                 $response->setMeta('text/gemini');
             } elseif ($pathinfo['extension'] == 'md' || $pathinfo['extension'] == 'markdown') {
@@ -179,6 +198,37 @@ class Server
         return sprintf('tls://%s:%s', $this->config->host, $this->config->port);
     }
 
+    public function makeDirectoryIndex($path, $root)
+    {
+        $files = glob($path . "*");
+
+        $body = "# Directory listing " . str_replace($root, '', $path) . "\n\n";
+        $body .= "=> " . str_replace($root, '', dirname($path)) . " ..\n";
+
+        foreach ($files as $file) {
+            $relative_path = str_replace($path, '', $file);
+
+            $is_dir = false;
+            if (is_dir($file)) {
+                $is_dir = true;
+                $size = '';
+            } else {
+                $size = filesize($file);
+            }
+
+            $body .= sprintf(
+                "=> %s%s %s%s%s\n",
+                urlencode($relative_path),
+                ($is_dir ? '/' : ''),
+                $relative_path,
+                ($is_dir ? '/' : ''),
+                ($size ? " ($size)" : '')
+            );
+        }
+
+        return $body;
+    }
+
     private function generateCert()
     {
         // Certificate data