killchannel maps a userID to its session goroutine's kill channel. It is accessed from HTTP request goroutines (Connect/Disconnect/logout/delete) and

InitializeS3Client creates or updates S3 client for a user

deleteKillChannel removes userID's entry, but only if it still maps to ch. A session goroutine passes the channel it captured at startup; if a newer s

DeleteMyClient removes a user's MyClient entry and clears any cached poll options associated with that user (best-effort; callers that only want to de

EnsureClientFromDB loads S3 config from DB and initializes client if enabled. Returns true if client is available.

RemoveClient removes S3 client for a user

routeRequest dispatches the request to the appropriate HTTP handler getUserIdParam extracts and validates userId from request params

jpegThumbnail resizes img to fit within width x height (preserving aspect ratio) and returns it JPEG-encoded. It encodes in memory, so there is no tem

Connects to Whatsapp Servers

Disconnects from Whatsapp websocket, does not log out device