Set proxy settings automatically using work laptop

set_proxy_on_work_laptop.sh

#!/bin/bash

##########################################################################################
#              Set proxy settings automatically using work laptop (~/.bashrc)	             #
##########################################################################################
USERNAME="<<username>> or <<domain\username>>"
PASSWORD="password"
PROXY_ADDRESS="proxy domain address"
NO_PROXY_DOMAINS=".local,.example.com"
WORK_IP_RANGE="10.10.10.*"
##########################################################################################


function encodeUrl() {
    # encodeUrl <string>
    old_lc_collate=$LC_COLLATE
    LC_COLLATE=C

    local length="${#1}"
    for (( i = 0; i < length; i++ )); do
        local c="${1:i:1}"
        case $c in
            [a-zA-Z0-9.~_-]) printf "$c" ;;
            *) printf '%%%02X' "'$c" ;;
        esac
    done

    LC_COLLATE=$old_lc_collate
}

function isWork() {
    local IPs=$(ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1')
    local is_work=false
    for ip in $(echo ${IPs} | tr " " "\n")
    do
        if [[ ${ip} == ${WORK_IP_RANGE} ]]; then
            is_work=true
        fi
    done
    echo "${is_work}"
}

function setWorkProxy() {
    local PROXY_CREDENTIALS="$(encodeUrl ${USERNAME}):$(encodeUrl ${PASSWORD})"
    local PROXY_ADDRESS_WITH_CREDENTIALS="http://${PROXY_CREDENTIALS}@${PROXY_ADDRESS}"

    export http_proxy=$PROXY_ADDRESS_WITH_CREDENTIALS
    export https_proxy=$http_proxy
    export HTTP_PROXY=$http_proxy
    export HTTPS_PROXY=$http_proxy
    export no_proxy=${NO_PROXY_DOMAINS}
    export NO_PROXY=$no_proxy
    echo "==================== work proxy has been set ===================="
}

function unsetProxy() {
        unset http_proxy
        unset https_proxy
        unset HTTP_PROXY
        unset HTTPS_PROXY
        unset no_proxy
        unset NO_PROXY
}

function setProxy {
    if [[ $(isWork) == true ]]; then
        setWorkProxy
    else
        unsetProxy
    fi
}

setProxy