#!/bin/bash

        proxy_add=https://proxy61.iitd.ac.in/cgi-bin/proxy.cgi

        read -rp "Enter IITD username: " username
        read -rsp "Enter IITD password: " password

        unsetProxy()
        {
                unset http_proxy
                unset https_proxy
                unset ftp_proxy
        }

        getsessionid()
        {
                session_id=`curl $proxy_add -s -k --no-progress-bar --connect-timeout 15| grep -m 1 sessionid[\"=[:alpha:]\ ]*[[:digit:]]* | grep -oh "\"[[:digit:]][[:alnum:]]*\"" | sed 's|"||' | sed 's|"||' `
                #echo "Session ID: $session_id"
        }

        logout()
        {
                curl -d "sessionid=$session_id&action=logout" $proxy_add -k -s >/dev/null
                if [ ${#ifAlreadyLoggedIn} = 0 ]; then
                                echo -e "Enjoy!"
                else
                                echo -e "proxy logout!!" ;
                fi

                exit 0
        }

        login()
        {
                logintext=`curl -d "sessionid=$session_id&action=Validate&userid=$username&pass=$password" $proxy_add -k -s`
                #echo $logintext
                ifAlreadyLoggedIn=`echo $logintext | grep -v "already logged in"`
                if [ ${#ifAlreadyLoggedIn} = 0 ]; then
                                echo "Already logged in"
                                exit 0
                fi
        }

        #trap logout SIGINT

        retries=1000
        islogout=1;

        mainloop()
        {
                unsetProxy
                getsessionid
                login
                iflogin=`echo $logintext | grep "logged in successfully"`
                if [ ${#iflogin} = 0 ] ;then
                        echo "error in login"
                        sleep 10
                        mainloop
                else
                        echo "proxy login "
                        while true; do
                                sleep 120
                                refreshtext=`curl -d "sessionid=$session_id&action=Refresh" $proxy_add -k -s`
                                ifrefresh=`echo $refreshtext | grep "logged in successfully"`
                                if [ ${#ifrefresh} = 0 ] ;
                                        then
                                        curl -d "sessionid=$session_id&action=logout" $proxy_add -k -s >/dev/null
                                        mainloop
                                fi
                        done
                fi
        }

        trap logout EXIT
        mainloop