Quick ugly script for bulk download of packt ebooks from your own account

packt-sync.pl

#!/usr/bin/perl
$| = 1;

use URI::Escape;
use LWP;
use JSON;

my $user = 'email@domain.com';
my $pw = 'my-password';
my $download_path = "/home/myuser/packt";

my $debug = 0;

my $ua = new LWP::UserAgent;

my $req = HTTP::Request->new( POST => "https://services.packtpub.com/auth-v1/users/tokens" );

my $login = {
    username => $user,
    password => $pw
};
my $content = encode_json($login);
$req->content($content);
$req->content_type("application/json");

my $res = $ua->request($req);

my $rinfo  = decode_json( $res->content );
my $atoken = $rinfo->{data}->{access};

my $offset  = 0;
my $max     = 0;
my $page    = 20;
my $baseurl = "https://services.packtpub.com/entitlements-v1/users/me/products?sort=createdAt:DESC&limit=$page";
my @results = ();

while ( !$max || $total < $max ) {
    print "Requesting at offset $offset";
    if ($max) {
        print ", total $max";
    }
    print "...";

    my $tmpurl = $baseurl . "&offset=$offset";
    my $req = HTTP::Request->new( GET => $tmpurl );
    $req->header( "Authorization" => "Bearer $atoken" );

    my $res   = $ua->request($req);
    my $rinfo = decode_json( $res->content );
    $max = $rinfo->{count};

    my @recs = @{ $rinfo->{data} };
    my $rcnt = scalar(@recs);

    print " received $rcnt answers.\n";
    $total += $rcnt;
    push( @results, @recs );

    $offset += $rcnt;
}

foreach my $book (@results) {
    my $name = $book->{productName};
    my $pid  = $book->{productId};

    my $fname = $name;
    $fname =~ s|\s*\[ebook\]\s*$||gio;
    $fname =~ s|/|_|gio;
    $fname =~ tr/[a-z0-9\-\.A-Z ]//cd;

    my $path = "$download_path/${fname}.pdf";
    if ( !-e $path ) {
        print "need to download $name\n";

        my $infourl = "https://services.packtpub.com/products-v1/products/$pid/files/pdf";
        my $req = HTTP::Request->new( GET => $infourl );
        $req->header( "Authorization" => "Bearer $atoken" );

        my $infores = $ua->request($req);
        my $pdfinfo = decode_json( $infores->content );

        my $pdfurl = $pdfinfo->{data};
        if ( $pdfurl =~ m|^http(s)+://|o ) {
            print "Downloading ($pdfurl).\n";
            my $dlreq = HTTP::Request->new( GET => $pdfurl );
            my $dlres = $ua->request($dlreq);
            if ( $dlres->is_success ) {
                open( my $out, ">${path}" );
                print $out $dlres->content;
                close($out);
            }
            else {
                print "Failed download: " . $res->as_string, "\n";
            }
        }
    }
    else {
        $debug && print "already have $path\n";
    }
}

Nice work!
How to download code, epub and mobi?
I tried changing pdf in "https://services.packtpub.com/products-v1/products/$pid/files/pdf" but no luck.

@zagrebzagreb do bear in mind that it also is hard coded to give the downloaded file a .pdf extension on line #71, regardless of the format you tell it to download on line #75.
You can either update this manually, use @davidcollom's modified version: https://gist.github.com/davidcollom/f7673bc4a6920535ac33f3027b8970fe , or use my alternate php downloader: https://gist.github.com/chappy84/c3b1533cec4ac0589b2dcc318b4e6606