#!/bin/bash 
# Author: Cpm
# License: GNU AGPLv3+
# Nagios plugin to check Forgejo version

function usage
{
 echo "Usage : $0"
}

function get_gitea_local_version
{
    local result

    local DOMAIN_URL="$1"
    
    result=$(curl -6 -s -X GET "${DOMAIN_URL}/api/v1/version" -H  "accept: application/json" | egrep -Eo "[[:digit:].-]+")

    echo "$result"
}   

function get_last_version_from_gitea
{
    local result

    local DOMAIN_URL="$1"
    local OWNER="$2"
    local REPO_NAME="$3"

    local result=$(curl -s -X GET "${DOMAIN_URL}/api/v1/repos/${OWNER}/${REPO_NAME}/releases" -H  "accept: application/json" | jshon |grep tag_name | head -1 | egrep -Eo "[[:digit:].-]+")

    echo "$result"
}

function get_forgejo_last_version
{
    local result

    result=$(get_last_version_from_gitea "https://codeberg.org" "forgejo" "forgejo")
    
    echo "$result"
}


#
if [ "$#" -ne 0 ]; then
    usage
else
    localVersion=$(get_gitea_local_version "https://forge.a-lec.org")
    #echo "Local version = $localVersion"
    
    lastVersion=$(get_forgejo_last_version)
    #echo "Last version    = $lastVersion"

    if [[ -z $localVersion ]]; then
        echo "Bad local version value."
    elif [[ -z $lastVersion ]]; then
        echo "Bad last version value."
    elif [ $localVersion = $lastVersion ]; then
        echo "OK"
        result=0
    else
        echo "WARNING : new version available, current is $localVersion, last is $lastVersion."
        result=1
    fi    
fi
exit $result