FutureLearn Video downloader (with aria2c and resume support)

futurelearn_dl.sh

#!/bin/bash

#
# Usage:
#    > futurelearn_dl.sh login@email.com password course-name week-id
# Where *login@email.com* and *password* - your credentials
# ,*course-name* is the name from URL
# and *week-id* is the ID from the URL
#
# E.g. To download all videos from the page: https://www.futurelearn.com/courses/corpus-linguistics/todo/238
# Execute following command:
#    > futurelearn_dl.sh login@email.com password corpus-linguistics 238
#

email=$1
password=$2
course=$3
weekid=$4
HD=/hd

# Pulls the login page and strips out the auth token
authToken=`curl -s -L -c cookies.txt 'https://www.futurelearn.com/sign-in' | \
           ggrep -Po "(?<=authenticity_token\" value=\")([^\"]+)"`


function dlvid {
    vzid=`curl -s -b cookies.txt $1 | ggrep -Po '(?<=video-)[0-9]+'`
    vzurl=https://view.vzaar.com/${vzid}/download${HD}
    aria2c -c $vzurl
}

# Posts all the pre-URI-encoded stuff and appends the URI-encoded auth token
curl -X POST -s -L -e 'https://www.futurelearn.com/sign-in' -c cookies.txt -b cookies.txt \
    --data-urlencode email=$email \
    --data-urlencode password=$password \
    --data-urlencode authenticity_token=$authToken 'https://www.futurelearn.com/sign-in' > /dev/null

# Download Course page
curl -s -L -b cookies.txt https://www.futurelearn.com/courses/${course}/todo/${weekid} | \
    ggrep -B8 'headline.*video' | ggrep -o '/courses[^"]*' | \
    while read -r line; do
        url=https://www.futurelearn.com${line}
        dlvid $url
    done

how i use this