fix snapshot to use nat address

Author: Gia Thanh Vuong

lib/modules/device.js

@@ -635,8 +635,10 @@ OnvifDevice.prototype._mediaGetSnapshotUri = function() {
 				this.services.media.getSnapshotUri(params, (error, result) => {
 					if(!error) {
 						try {
-							profile['snapshot'] = result['data']['GetSnapshotUriResponse']['MediaUri']['Uri'];
-						} catch(e) {}
+              let snapshotUri = result['data']['GetSnapshotUriResponse']['MediaUri']['Uri'];
+              snapshotUri = this._getSnapshotUri(snapshotUri);
+							profile['snapshot'] = snapshotUri;
+						} catch(e) { console.log(e);}
 					}
 					profile_index ++;
 					getSnapshotUri();
@@ -668,4 +670,17 @@ OnvifDevice.prototype._getUri = function(directUri) {
   return newUri;
 }
 
+OnvifDevice.prototype._getSnapshotUri = function(directUri) {
+  if (!this.keepAddr) return directUri;
+  const base = mUrl.parse('http://' + this.address);
+  const parts = mUrl.parse(directUri);
+  const newParts = {
+    protocol: parts.protocol,
+    host: base.host,
+    pathname: base.pathname + parts.pathname
+  }; 
+  const newUri = mUrl.format(newParts);
+  return newUri;
+}
+
 module.exports = OnvifDevice;