Adfly Bypass Script

#!/bin/bash

USER_AGENT="Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.28 (KHTML, like Gecko) Chrome/26.0.1397.2 Safari/537.28"
ADFLY=$1

if [ "$ADFLY" == "" ]; then
    echo "Usage: adfly <link>"
    echo "Works on every adfly link"
    exit 0
fi

ADFLY=$(echo "$ADFLY" | sed 's~http[s]*://~~g')

target_encoded=$(curl -s --user-agent "$USER_AGENT" $ADFLY | grep "var ysmm" | cut -d \' -f 2)
strlen=$(expr length "$target_encoded")

chunk1=""
chunk2=""

for i in $(seq 0 $strlen);
do
    if [ $((i%2)) -eq 0 ]; then
        chunk2=$chunk2"${target_encoded:$i:1}"
    else
        chunk1="${target_encoded:$i:1}"$chunk1
    fi
done

target_base64=$chunk2"$chunk1"
target=$(echo $target_base64 | base64 -d)

subnum=$((strlen-2))

target=${target:2:$subnum}

echo "$ADFLY -> $target"