#!/bin/bash -e
#
# Improved backup script for Ubiquiti UniFi controller
# original source: http://wiki.ubnt.com/UniFi#Automated_Backup
#

# must contain:
# username=<username>
# password=<password>
source ~/.unifi-backup

baseurl=https://localhost:8443
output=/root/backups/unifi
filename=`date +%Y%m%d%H%M`.unf
keep_days=1

# create output directory
mkdir -p $output

curl_cmd="curl --cookie /tmp/cookie --cookie-jar /tmp/cookie --insecure --silent --fail"

# authenticate against unifi controller 
if ! $curl_cmd --data '{"username":"'$username'","password":"'$password'"}' $baseurl/api/login > /dev/null; then
  echo Login failed
  exit 1
fi

# ask controller to do a backup, response contains the path to the backup file 
path=`$curl_cmd --data 'json={"cmd":"backup","days":"-1"}' $baseurl/api/s/default/cmd/system | sed -n 's/.*\(\/dl.*unf\).*/\1/p'`

# download the backup to the destinated output file 
$curl_cmd $baseurl$path -o $output/$filename

# logout 
$curl_cmd $baseurl/logout

# delete outdated backups
find $output -ctime +$keep_days -type f -delete

echo Backup successful