Adds a getAnnounceOpts callback to forward to the tracker

lib/torrent.js

@@ -90,6 +90,7 @@ function Torrent (torrentId, opts) {
   this.pieces = []
   this._selections = []
   this._critical = []
+  this._getExtraAnnounceOpts = opts.getExtraAnnounceOpts
 
   // for cleanup
   this._servers = []
@@ -280,7 +281,15 @@ Torrent.prototype._onSwarmListening = function () {
     peerId: self.client.peerId,
     port: self.client.torrentPort,
     rtcConfig: self.client._rtcConfig,
-    wrtc: self.client._wrtc
+    wrtc: self.client._wrtc,
+    getAnnounceOpts: function () {
+      return {
+        uploaded: self.uploaded,
+        downloaded: self.downloaded,
+        left: self.length - self.downloaded,
+        extraAnnounceOpts: self._getExtraAnnounceOpts && self._getExtraAnnounceOpts()
+      }
+    }
   })
   self.discovery.on('error', self._onError.bind(self))
   self.discovery.on('peer', self.addPeer.bind(self))