This is a Puppetfile that will automatically download all supported+approved modules from the forge

Puppetfile

#!/usr/bin/ruby
require 'puppet_forge'

# Example of a module from an internal repo co-existing with forge modules.
#mod 'splunk',
#  :git => 'https://internal.git.server/example/puppet-splunk.git',
#  :commit => '3ca47046a86aef9fbfdf58cc7b418d8e7254ecb9'

@dependencies = []
@approved     = []
@supported    = []

def populate_module_dependencies(forge_module)
  forge_module.current_release.metadata['dependencies'].each do |dependency|
    @dependencies << dependency['name']
  end
end

def add_modules()
  modules = (@dependencies << @approved << @supported).flatten
  modules.compact.uniq.each do |dependency|
    mod dependency.sub('-','/')
  end
end

def populate_supported_modules
  PuppetForge::Module.where( supported: 'true' ).unpaginated.each do |supported|
    @supported << "#{supported.owner.username}/#{supported.name}"
    populate_module_dependencies supported
  end
end

def populate_approved_modules
  PuppetForge::Module.where( endorsements: 'approved' ).unpaginated.each do |approved|
    @approved << "#{approved.owner.username}/#{approved.name}"
    populate_module_dependencies approved
  end
end

populate_supported_modules
populate_approved_modules
add_modules

You can test this locally with the following:

gem install puppet_forge
gem install r10k
git clone git@gist.github.com:/940f75d82e7acb21babc.git
cd 940f75d82e7acb21babc/
r10k puppetfile install -v debug
ls -l ./modules