Bash script to find the top AFK in a drawpile server and KICK them

drawpile-afk-kick.sh

#!/bin/sh

# Drawpile Admin API URL. Alternatively use pubsrvproxy for safety.
API=http://localhost:27780/api

# Minimun free slots to begin AFK KICK
MINSLOTS=3

# Number of AFK users to KICK
NUM2KICK=5

# Minutes to be considered AFK
MINAFK=60

# Message to be given before KICK format(name, seconds afk)
MESSAGE="%s, you have been AFK kicked by the administrator for being %(%H:%M)T hours away."

# Should we log the kicks to console?
LOG=1


# Get the session ids with almost no slots for only public boards
sessions=$(curl -s $API/sessions | jq -c '[.[]
  | select(.hasPassword == false and .maxUserCount - .userCount < '$MINSLOTS')
  | .id]')


# Exit if there is no sessions full
if [ "$sessions" = "[]" ]; then
        exit
fi


# Don't overwhelm Admin
sleep .5


# Pick top non mod non op AFK
users=$(curl -s $API/users | jq '.
  | map(.afk = (.lastActive | split("+")[0] + "Z" | now - fromdate))
  | sort_by(-.afk)
  |
  [ .[]
    | select(.session | IN('${sessions:1:-1}'))
    | select(.mod == false and .op == false and .afk > 60*'$MINAFK')
    | [.id, .session, .name, .afk]
    | join("|")
  ] [:'$NUM2KICK'] []' )


# Avoid any action if the above failed
if [ $? -ne 0 ]; then
    exit 1;
fi

# If no users to kick, notify
if [ "$users" = "" ]; then
    if [ "$LOG" -ne "0" ]; then
        printf "FULL without AFK\n"
    fi
    exit
fi


# Notify and Kick
while IFS=$'\n' read line; do
  IFS='|' read -r id session name afk <<<"${line:1:-1}"

  afk=${afk%.*}
  
  # Output for logging
  if [ "$LOG" -ne "0" ]; then
          printf "KICK %s/%s\t%s\t%(%HH:%MM:%SS)T\t%s\n" "$session" "$id" "$afk" "$afk" "$name"
  fi

  url="$API/sessions/$session/$id"
  msg=$(printf "$MESSAGE" "$name" "$afk")
  curl -s -H 'Content-Type: application/json' -X PUT -d '{"message":"'"$msg"'"}' "$url" -o /dev/null
  sleep .5
  curl -s -X DELETE "$url" -o /dev/null
  sleep 1

done <<<"$users"

x-drawpile-afk-kick.service

[Unit]
Description=Drawpile afk users kick service

[Service]
Type=oneshot
ExecStart=drawpile-afk-kick.sh

[Install]
WantedBy=multi-user.target

x-drawpile-afk-kick.timer

[Timer]
OnCalendar=*:0/15

[Install]
WantedBy=timers.target