[PLUG] Packt free ebook grabber script

A while back, Pennth (Rachel) mentioned yet another Packt free ebook that I'd just missed out on, and I got to Googling. I eventually found the script below (and attached), though I then did some additional hackery (I wanted to grab epub and mobi, not just pdf). I've been running this on my Raspberry Pi IRC host for some weeks now via cron, and it seems to be working well. I didn't write this, just mutilated it and am running it, but it seems pretty clean and simple, and I've gotten good results.

Like most FOSS licenses, if it breaks you can keep both pieces.

~/packt » crontab -l

0 14 * * * /home/forge/packt/fetch.sh >> /tmp/cron_output

~/packt » cat fetch.sh

#!/bin/bash

export PATH=/bin:/usr/bin:$PATH

# Login Credentials

USERNAME=""

PASSWORD=""

CREDENTIALS_FILE="$HOME/.packt"

# Options

DOWNLOAD=$PACKT_DOWNLOAD

DOWNLOAD_PATH="$HOME/packt"

# Log running information

echo "Date: $(date)"

if [ -z "$DOWNLOAD" ]; then

DOWNLOAD="Y"

if [ -f $CREDENTIALS_FILE ];

then

credentials_base64=`cat $CREDENTIALS_FILE`

credentials=`echo $credentials_base64 | base64 --decode`

USERNAME=`echo $credentials | awk -F":" '{print $1}'`

PASSWORD=`echo $credentials | awk -F":" '{print $2}'`

if [ -z "$USERNAME" ] || [ -z $PASSWORD ]

then

echo "Please enter your Packt username (email): "

read USERNAME

echo "Please enter your Packt password: "

read PASSWORD

credentials_base64=`echo "$USERNAME:$PASSWORD" | base64`

echo $credentials_base64 > $CREDENTIALS_FILE

chmod 400 $CREDENTIALS_FILE

echo "Your credentials was saved to $CREDENTIALS_FILE in base64 encoded format."

# Constant

TMP_FILE="/tmp/free-learning.txt"

URL_LOGIN="https://www.packtpub.com"

COMMAND_LOGIN="curl -s -i -X POST -d email=$USERNAME&password=$PASSWORD&op=Login&form_id=packt_user_login_form $URL_LOGIN"

URL_FREE_LEARNING="https://www.packtpub.com/packt/offers/free-learning"

COMMAND_FREE_LEARNING="curl -s -X GET $URL_FREE_LEARNING"

response_login=$($COMMAND_LOGIN > $TMP_FILE)

login_cookie=$(cat $TMP_FILE | grep Set-Cookie | tail -1 | grep -Po "Set-Cookie: (SESS_live=*\w*)" | cut -d\ -f2)

if [[ -z "$login_cookie" ]]; then

login_cookie=$(cat $TMP_FILE | grep Set-Cookie | tail -2 | grep -Po "Set-Cookie: (SESS_live=*\w*)" | cut -d\ -f2)

response_freelearning=$($COMMAND_FREE_LEARNING)

book_title=$(echo $response_freelearning | grep -Po "(?<=<div class=\"dotd-title\"> <h2> )[\w .-]+(?= <\/h2> <\/div>)")

book_href=$(echo $response_freelearning | grep -Po "(?<=<a href="" \/-]+(?=\" class=\"twelve-days-claim\")")

book_number=$(echo $book_href | cut -d/ -f3)

book_url=$URL_LOGIN$book_href

echo "Today's free book: $book_title"

echo "Claim url: $book_url"

COMMAND_CLAIM_FREE_BOOK="curl -i -s --cookie $login_cookie $book_url"

$COMMAND_CLAIM_FREE_BOOK > /dev/null 2>&1

if [ "Y" = "$DOWNLOAD" ]; then

mkdir -p $DOWNLOAD_PATH

URL_DOWNLOAD_BOOK="https://www.packtpub.com/ebook_download/$book_number/pdf"

BOOK_LOCATION="$DOWNLOAD_PATH"/"$book_title".pdf

COMMAND_DOWNLOAD_BOOK="curl -s -i --cookie $login_cookie $URL_DOWNLOAD_BOOK"

echo "Downloading PDF to $BOOK_LOCATION..."

$COMMAND_DOWNLOAD_BOOK > "$BOOK_LOCATION"

echo "Downloaded PDF to $BOOK_LOCATION"

URL_epub_DOWNLOAD_BOOK="https://www.packtpub.com/ebook_download/$book_number/epub"

BOOK_epub_LOCATION="$DOWNLOAD_PATH"/"$book_title".epub

COMMAND_DOWNLOAD_epub_BOOK="curl -s -i --cookie $login_cookie $URL_epub_DOWNLOAD_BOOK"

echo "Downloading epub to $BOOK_epub_LOCATION..."

$COMMAND_DOWNLOAD_epub_BOOK > "$BOOK_epub_LOCATION"

echo "Downloaded epub to $BOOK_epub_LOCATION"

URL_mobi_DOWNLOAD_BOOK="https://www.packtpub.com/ebook_download/$book_number/mobi"

BOOK_mobi_LOCATION="$DOWNLOAD_PATH"/"$book_title".mobi

COMMAND_DOWNLOAD_mobi_BOOK="curl -s -i --cookie $login_cookie $URL_mobi_DOWNLOAD_BOOK"

echo "Downloading mobi to $BOOK_mobi_LOCATION..."

$COMMAND_DOWNLOAD_mobi_BOOK > "$BOOK_mobi_LOCATION"

echo "Downloaded mobi to $BOOK_mobi_LOCATION"

else

echo "Free book has added to your Packt account."