FetLife picture downloader

#!/usr/bin/env perl
# Download all FetLife pictures from a profile.
#
# Usage instructions:
# * Fill in the constants.
# * Make a folder named "images".
# * Run the script.

use strict;
use warnings;
use WWW::Mechanize;

use constant {
    USERNAME => 'username',
    PASSWORD => 'password',
    USERID   => 'fetlife-userid'
};

my $mech = WWW::Mechanize->new();

main($mech);

sub login {
    my $mech = shift;

    $mech->get('https://fetlife.com/login');

    $mech->submit_form(
        with_fields => {
            'nickname_or_email' => USERAME,
            'password' => PASSWORD
        }
    );
}

sub getPicturesOf {
    my $mech = shift;
    my $uid = shift;

    $mech->get("https://fetlife.com/users/$uid/pictures");

    my $next = $mech->find_link(text_regex => qr/Next /);
    while (defined($next)) {
        $next = $next->url;
        downloadPictures($mech, $uid);
        $mech->get("https://fetlife.com/$next");
        $next = $mech->find_link(text_regex => qr/Next /);
    }
    downloadPictures($mech, $uid);
}

sub downloadPictures {
    my $mech = shift;
    my $uid = shift;

    my @images = $mech->find_all_images(url_regex => qr{https://flpics\d.a.ssl.fastly.net/\d+/$uid/});

    map {
        my $imgurl = $_->url;
        $imgurl =~ s/\d+\.jpg$/720.jpg/;
        if ($imgurl =~ m{/([^/]+)$}) {
            print "Downloading $1\n";
            $mech->get($imgurl, ":content_file" => "images/$1");
        } else {
            print "No go.\n";
        }
    } @images;

}

sub main {
    my $mech = shift;

    login($mech);
    getPicturesOf($mech, USERID);
}