add protection against requesting direct service files

zefie_wtvp_minisrv/WTVShared.js

@@ -199,6 +199,37 @@ class WTVShared {
         return path.reverse().split(".")[0].reverse();
     }
 
+    getLineFromFile(filename, line_no, callback) {
+        var stream = this.fs.createReadStream(filename, {
+            flags: 'r',
+            encoding: 'utf-8',
+            fd: null,
+            bufferSize: 64 * 1024
+        });
+
+
+        var fileData = '';
+        stream.on('data', function (data) {
+            fileData += data;
+
+            // The next lines should be improved
+            var lines = fileData.split("\n");
+
+            if (lines.length >= +line_no) {
+                stream.destroy();
+                callback(null, lines[+line_no]);
+            }
+        });
+
+        stream.on('error', function () {
+            callback('Error', null);
+        });
+
+        stream.on('end', function () {
+            callback('File end reached without finding line', null);
+        });
+    }
+
     /**
      * Strips bad things from paths
      * @param {string} base Base path