#!/bin/bash

cd "$(dirname "$0")"
BASEPATH=/app/wsusoffline/
if [ ! -d ../temp ]; then
   mkdir ../temp
fi
wget --timestamping --directory-prefix="../static" \
    "http://download.wsusoffline.net/StaticDownloadLink-recent.txt"

diff --strip-trailing-cr \
    "../static/StaticDownloadLink-this.txt" \
    "../static/StaticDownloadLink-recent.txt" > /dev/null

if (( $? == 0 )); then
    echo "The installed version of WSUS Offline Update is up-to-date."
    exit 0;
else
    URL=$(cat ../static/StaticDownloadLink-recent.txt)
    echo Updating WSUS Offline Update..!
    cd ../temp/
    wget -q $URL
    HASH=$(echo $URL |sed 's/\.zip/_hashes.txt/')
    wget -q $HASH
    FILE=$(echo $URL |sed 's/http:\/\/download.wsusoffline.net\///')
    HASH=$(echo $FILE|sed 's/\.zip/_hashes.txt/')
    if [[ -f $FILE ]]; then
        SHA256=$(sha256sum ../temp/$FILE | awk '{print $1}')
            if [[ $(grep -c "$SHA256,$FILE" $HASH) -gt 0 ]]; then
                echo Download validated
                cd ../temp/
                if [[ -d wsusoffline ]]; then
                    rm -r wsusoffline
                fi
                unzip -q $FILE
                cd ..
                cp -av temp/wsusoffline/* $BASEPATH
                else
                        echo Download failed
                        if [[ -f ../temp/$FILE ]]; then
                                rm -v ../temp/$FILE
                        fi
                        if [[ -f ../temp/$HASH ]]; then
                                rm -v ../temp/$HASH
                        fi
                        if [[ -d ../temp/wsusoffline ]]; then
                                rm -r ../temp/wsusoffline/
                        fi
            fi
    fi
fi
cd $BASEPATH
# cleanup
if [ -d ../temp ]; then
   rm -rf ../temp
fi

find ../ -name '*.sh' -print0 | xargs -0 chmod +x
echo "${CRON} /bin/sh /cron/run.sh" > /cron/crontab
/bin/sh /cron/run.sh