download coursera lecture videos

coursera-download.sh

#!/bin/bash

# download video by providing video url and cookie.
# saved file name will be from Content-Disposition
function download() {
	local url=$1
	local cookies=$2

	local filename=$(curl -I -L -s --cookie "$cookies" "$url" | grep Content-Disposition | python -c "import sys, urllib as ul; print ul.unquote(sys.stdin.read());" | awk -F\" '{print $2}')
	echo "start to download $filename"
	curl -L -o "$filename" --cookie "$cookies" "$url"
}

# extract all video links from page
function listUrls() {
	local page=$1
	local cookies=$2

	urls=$(curl -s --cookie "$cookies" "$page" | grep download.mp4 | awk -F\" '{print $4}')
	echo "$urls"
}

# download all videos on a page
function downloadAll() {
	local page=$1
	local cookies=$2

	local urls=$(listUrls "$page" "$cookies")
	for url in $urls ; do
  		download "$url" "$cookies"
	done
}

cat << EOF

HELP

firstly you need to run following to import functions to your current shell session :
>. ./coursera.sh

to download a single video , run (replace cookies with your own):
>download "https://class.coursera.org/artificialvision-001/lecture/download.mp4?lecture_id=41" "CAUTH=xxx"
1st param is video url, 2nd is the cookie needed to access this privileged url

to download all videos on lectures page, run :
>downloadAll "https://class.coursera.org/artificialvision-001/lecture" "CAUTH=XXX"
1st param is the page url that contains links to video url
2nd is the cookie needed to access this privileged url

cookies can be viewed and copied from chrome's developer tool

EOF