mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

package main

import "fmt"
import "bufio"
import "os"
import "strings"

const (
	ACTION = iota
	USER
	HOST
	PASSWORD
)

func main() {
	stdin := bufio.NewScanner(os.Stdin)
	for stdin.Scan() {
		parts := strings.SplitN(stdin.Text(), ":", 4)
		switch parts[ACTION] {
			case "auth":
				if parts[USER] == "someone" {
					fmt.Printf("1\n")
					continue
				}
				
			default: fmt.Printf("0\n")
		}
	}
}