WWDC2015's videos downloader

wwdc2015.sh

#!/bin/bash

############################################################################
# Automated WWDC 2015 videos downloader script
# Cristian Grau @SaroFR
############################################################################

function showPercentage {
	sleep 5
	currentsize=0
        while [ $currentsize -lt $remotesize ]
        do
                currentsize=`ls -la $filename |tr -s " "|cut -d" " -f5`
                percent=$[$currentsize*100/$remotesize]
                echo -ne "-> Downloading $remotesize bytes from $1.   $percent%\r"
                sleep 0.5

                currentsize=`ls -la $filename |tr -s " "|cut -d" " -f5`
                percent=$[$currentsize*100/$remotesize]
                echo -ne "-> Downloading $remotesize bytes from $1..  $percent%\r"
                sleep 0.5

                currentsize=`ls -la $filename |tr -s " "|cut -d" " -f5`
                percent=$[$currentsize*100/$remotesize]
                echo -ne "-> Downloading $remotesize bytes from $1... $percent%\r"
                sleep 0.5
        done

	echo -e "-> Downloading $remotesize bytes from $1... [\033[38;5;40mSUCCESS\033[39m]"
}

function resume {
	curl --silent -C - --remote-name $1 &
	showPercentage $1
}

function download {
        curl --silent --remote-name $1 &
	showPercentage $1
}

if [ $# -eq 0 ]; then
	echo "Usage: `basename $0` (SD | HD) [-e <excluded-id>]..."
	exit 1
fi

quality=`echo $1 | tr '[:lower:]' '[:upper:]'`

if [ $quality != "SD" ] && [ $quality != "HD" ]; then
	echo "Usage: `basename $0` (SD | HD) [-e <excluded-id>]..."
        exit 1
fi

excludedIds=""

shift
while [ $# -gt 1 ]
do
	opt=$1
	case $opt in
		-e|--exclude)
			excludedIds="$excludedIds | grep -v $2"
			shift
		;;
		*)
			echo "Invalid parameter $opt"
			exit 2
		;;
	esac
	shift
done

echo -n "-> Checking available videos... "

command="curl --silent https://developer.apple.com/videos/wwdc/2015/| tr -d \"\t\" |grep \"?id=\" | grep \"^<a href\" $excludedIds"
files=`eval $command`

echo "Found `echo $files | sed -e $'s/a> /a>;/g' | tr ";" "\n" | wc -l | tr -d " "` "

for fileId in `echo $files | sed -e $'s/a> /a>;/g' | tr ";" "\n" | cut -d"=" -f3 | cut -d"\"" -f1 | sort -n`
do
	url=`echo https://developer.apple.com/videos/wwdc/2015/?id=$fileId`
	if [ $quality == "SD" ]; then
		remotefile=`curl --silent \`echo $url\` | grep "SD" | tr -d "\t" | cut -d"\"" -f4 | cut -d"?" -f1`
	else
		remotefile=`curl --silent \`echo $url\` | grep "HD" | tr -d "\t" | cut -d"\"" -f8 | cut -d"?" -f1`
	fi
	filename=`echo $remotefile | cut -d"/" -f9`

	echo -n "-> Checking $filename... "
        remotesize=`curl -sI $remotefile | grep "Content-Length" | cut -d" " -f2 | sed 's/.$//'`

	if [ -f $filename ] ; then
		localsize=`ls -la $filename | tr -s " " | cut -d" " -f5`
		
		if [ $remotesize -gt $localsize ]; then
                        echo -e "[\033[38;5;196mSIZE DOESN'T MATCH\033[39m]"
                        echo "-> Resuming download..."
                        resume $remotefile
                elif [ $remotesize -lt $localsize ]; then
                        echo -e "[\033[38;5;196mWRONG SIZE\033[39m]"
                        echo "-> Restarting download..."
                        rm $filename
                        download $remotefile
                else
                        echo -e "[\033[38;5;40mALREADY DOWNLOADED\033[39m]"
                fi

	else
		echo -e "[\033[38;5;196mDOESN'T EXIST\033[39m]"
		download $remotefile
	fi
done