[FEATURE REQ] Support for Synology Download Station

[iblagoev]

Is your feature request related to a problem? Please describe.
Add support for Download Station.

Describe the solution you'd like
A way for Autobrr to send download events to Download Station.

Additional context
I've played around with their API and figured out the below endpoints in order to send a download event to DS.
Tested on DSM 7.2.1-69057 Update 3 and Download Station version 4.0.1-4709.

Link to an old doc for the DS API -> https://global.download.synology.com/download/Document/Software/DeveloperGuide/Package/DownloadStation/All/enu/Synology_Download_Station_Web_API.pdf

Based on the above doc we can get all the API endpoints by sending a GET request to /webapi/query.cgi?api=SYNO.API.Info:

curl -X GET "https://ip_or_fqdn_of_synology/webapi/query.cgi?api=SYNO.API.Info&version=1&method=query&query=ALL"

from there to authenticate the /webapi/auth.cgi?api=SYNO.API.Auth is used and version 7 (I guess for DSM 7 as anything below version 7 returns error 103 -> The requested method does not exist):

curl -X GET "https://ip_or_fqdn_of_synology/webapi/auth.cgi?api=SYNO.API.Auth&version=7&method=login&account=account_name&passwd=password&session=DownloadStation&format=sid

Output is:

{
    "data": {
        "account": "account_name",
        "device_id": "device_id",
        "ik_message": "",
        "is_portal_port": false,
        "sid": "oILR9wuTk7a0wEy3bR-WPAWxK2XiWQuHiU8gY1zkKOXjwFipEdjy5s_w0q03BLSgmfwh6OOVjUztLVYq94RgUV",
        "synotoken": "--------"
    },
    "success": true
}

From there we need to "keep/save" the sid as its used for auth on every other API endpoint.

I've tested against TL and to create a task the /webapi/DownloadStation/entry.cgi is used with the following parameters:

api = SYNO.DownloadStation2.Task
version = 2
type = url
url = url of torrent file
create_list = false (not sure of this, but it's a required parameter)
method = create
destination = destination folder

curl -X POST "https://ip_or_fqdn_of_synology/webapi/DownloadStation/entry.cgi?api=SYNO.DownloadStation2.Task&version=2&type=url&url=https://www.torrentleech.org/rss/download/id_of_torrent/rss_key/name_of.torrent&create_list=false&method=create&destination=dest_folder" \
-H "Content-Type: application/x-www-form-urlencoded" \
-d _sid=oILR9wuTk7a0wEy3bR-WPAWxK2XiWQuHiU8gY1zkKOXjwFipEdjy5s_w0q03BLSgmfwh6OOVjUztLVYq94RgUV

[zze0s]

Hey! Thanks for the detailed feature request! We'll consider implementing this in future versions 👍