DS Cam payload for GetSnapshot

[hquick81]

Hi,

first of all thx for the work on those DS nodes.

I want to use the DS cam node. I can use some functions but as far as i see it seems that no function is really implemented completely.

For example an HTTP call to

webapi/entry.cgi?api=SYNO.SurveillanceStation.Camera&version=8&method=GetSnapshot&_sid=BR7kAgsJL1dX21590MHN921500&cameraId=1

will get the current snapshot of camera 1. But currently when i use the DS Cam module with the GetSnapshot topic regardless of which payload i tried to use, the cameraId parameter is always missing in the HTTP call from node red to the Synology station.

What payload do i have to use for the GetSnapshot topic, that the HTTP call to the Synology station will be enhanced by the cameraId=1 parameter ? Or do I have to add sth. to the source code itself before i can do that ?

The functions with their parameters are described in the following document as well:

https://global.download.synology.com/download/Document/DeveloperGuide/Surveillance_Station_Web_API_v2.0.pdf

Thx and greetings

Holger

[draco2003]

If i put a json trigger before the DS Cam node with the following settings (your camera id may differ):
{
"cameraId": 10,
"preview": true,
"camStm": 1
}

This successfully requests the snapshot image, but crashes node red (haven't seen an error message anywhere other than server disconnected) since i don't think it knows what to do with the binary reponse from the server.

from tcpdump on the node-red box that makes the request, shows the headers of the synology box sending back the image:

Server: nginx
Date: Sat, 06 Jan 2018 05:46:56 GMT
Content-Type: image/jpeg
Content-Length: 81379
Connection: close
Cache-Control: max-age=2592000
Content-Disposition: inline; filename="snapshot.jpg"

I haven't tried modifying the code of this module yet, but maybe if we can do a base64 encode of the image around here: https://github.com/MattVador/node-red-contrib-syno/blob/master/ds/cam/ds-cam.js#L44
Then we'd be able to embed the string as a datauri in a dashboard template or email, etc..

Any help taking this to the next step would be great.

[MattVador]

This package is a node-red wrapper on syno npm package.
I have make a pull request (#40) to correct the behavior when response is anything other than text/plain.