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@jvanbaarsen jvanbaarsen/app.rb
Created Sep 21, 2016

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Auto office joiner
#!/usr/bin/env ruby
# encoding: utf-8
require 'net/http'
require 'socket'
LAST_SEEN_TIME_OUT = 60 * 60 * 2 # 2 hours
ACCESS_TOKEN = "YOUR_ACCESS_TOKEN"
CHANNEL_ID = "YOUR_CHANNEL_ID"
CHANNEL_NAME="YOUR_CHANNEL_NAME"
TOKEN_OWNER = "SLACK_ID_OF_USER_THAT_OWNS_THE_TOKEN"
def current_ips
ips = []
raw_data = `nmap -sn #{ip_address}/24 | grep "scan report for" | awk '{print $5}'`
raw_data.each_line do |line|
ips << line.chomp
end
ips
end
def ip_address
ip = Socket.ip_address_list.detect{|intf| intf.ipv4_private?}
return if ip.nil?
ip.ip_address
end
def find_mac_for_ip(ip)
`arp -a | grep "(#{ip})" | awk '{print $4}'`.chomp.downcase
end
def known_devices
{
"e1:e5:c0:97:3d:0c" => "Jeroen",
"5d:2c:b1:62:d9:45" => "Bob",
"8f:70:a9:32:01:49" => "Michiel",
}
end
def users
{
"jeroen" => "xxx",
"bob" => "yyy",
"michiel" => "zzz",
}
end
def still_in_office?(last_seen)
return false if last_seen.nil?
# Is last seen within 4 hours
last_seen.to_i + (LAST_SEEN_TIME_OUT) > Time.now.to_i
end
def device_to_name(device_mac)
known_devices[device_mac] || "Unknown device: #{device_mac}"
end
def join_channel(user_token)
if user_token == TOKEN_OWNER
Net::HTTP.get(URI("https://slack.com/api/channels.join?token=#{ACCESS_TOKEN}&name=#{CHANNEL_NAME}"))
else
Net::HTTP.get(URI("https://slack.com/api/channels.invite?token=#{ACCESS_TOKEN}&channel=#{CHANNEL_ID}&user=#{user_token}"))
end
end
def leave_channel(user_token)
if user_token == TOKEN_OWNER
Net::HTTP.get(URI("https://slack.com/api/channels.leave?token=#{ACCESS_TOKEN}&channel=#{CHANNEL_ID}"))
else
Net::HTTP.get(URI("https://slack.com/api/channels.kick?token=#{ACCESS_TOKEN}&channel=#{CHANNEL_ID}&user=#{user_token}"))
end
end
@first_run ||= true
loop do
puts "=" * 20
@last_devices ||= {}
current_ips.each do |ip|
@last_devices[find_mac_for_ip(ip)] = Time.now
end
begin
if @first_run
p "Running on IP: #{ip_address}"
offline_devices = known_devices.reject { |device| @last_devices.include?(device) }
offline_devices.each do |device, name|
user_token = users[name.downcase]
leave_channel(user_token)
puts "#{name} was not in the office when the script started"
end
@first_run = false
end
@last_devices.each do |device, time|
unless known_devices.include?(device)
puts "Unknown device: #{device}"
next
end
user_token = users[device_to_name(device).downcase]
if user_token.nil?
puts "Unknown user: #{device_to_name(device).downcase} with device #{device}"
next
end
if still_in_office?(@last_devices[device])
join_channel(user_token)
puts "#{device_to_name(device)} is in the office"
else
@last_devices.delete(device)
leave_channel(user_token)
puts "#{device_to_name(device)} is not in the office"
end
end
rescue SocketError
puts "No network connection, retrying in 10 seconds"
end
end
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