WWDC 2018 PDF / HD video downloading script

wwdc18.sh

#!/bin/bash

#Setup the environnement
mkdir wwdc2018
cd wwdc2018
mkdir tmp_download
cd tmp_download

#Extract IDs
echo "Downloading the index"
wget -q https://developer.apple.com/videos/wwdc2018/ -O index.html
#	find parts of the document where data-released=true, all the way to the first H4 header where title of that talk is 
#	then find lines containing "videos/play/wwdc2018", then remove all chars except session number, then clean duplicated lines
cat index.html | sed -n '/data-released=\"true\"/,/\<h4/p' | grep videos/play/wwdc2018 | sed -e 's/.*wwdc2018\///' -e 's/\/\"\>//' | sed '$!N; /^\(.*\)\n\1$/!P; D' > ../downloadData

rm index.html

#Iterate through the talk IDs
while read -r line
do
	#Download the page with the real download URL and the talk name
	wget -q "https://developer.apple.com/videos/play/wwdc2018/$line/" -O webpage

	#We grab the title of the page then clean it up
	talkName=$(cat webpage | grep "<title" | sed -e "s/.*\<title\>//" -e "s/ \- WWDC 2018.*//")

	#We grep "_hd_" which bring up the download URL, then some cleanup
	#If we were to want SD video, all we would have to do is replace _hd_ by _sd_
	dlURL=$(cat webpage | grep _hd_ | sed -e "s/.*href\=//" -e "s/\>.*//" -e "s/\"//g")
	pdfURL=$(cat webpage | grep .pdf | grep devstreaming | sed -e "s/.*href\=//" -e "s/\>.*//" -e "s/\"//g"  -e "s/ .*$//g")

	rm webpage

	#Is there a video URL?
	if [ -z "$dlURL" ]; then
		echo
	else
		echo "Video $line ($talkName)"
		echo "	url: $dlURL"
		#Great, we download the file
		wget -c "$dlURL" -O "../$line - $talkName.mp4"
	fi

	#Is there a PDF URL?
	if [ -z "$pdfURL" ]; then
		echo
	else
		echo "PDF $line ($talkName)"
		echo "	url: $pdfURL"
		#Great, we download the file
		wget -c "$pdfURL" -O "../$line - $talkName.pdf"
	fi

done < "../downloadData"

#cleanup
cd ..
rm -rf tmp_download
rm downloadData