output

supercow@stout:~$ puppet apply /tmp/test.pp
Notice: Compiled catalog for stout.4c in environment production in 0.05 seconds
Notice: /Stage[main]//Ssh_authorized_key[supercow@doppelbock]/ensure: current_value absent, should be present (noop)
Notice: /Stage[main]//Ssh_authorized_key[supercow@Kriek]/ensure: current_value absent, should be present (noop)
Notice: /Stage[main]//Ssh_authorized_key[supercow@stout]/ensure: current_value absent, should be present (noop)
Notice: Class[Main]: Would have triggered 'refresh' from 3 events
Notice: Stage[main]: Would have triggered 'refresh' from 1 events
Notice: Finished catalog run in 0.03 seconds

sshauth_to_hash.rb

# Returns a hash of an ssh_authorized_key resource from a file

Puppet::Parser::Functions::newfunction(
  :sshauth_to_hash, :type => :rvalue,
  :doc => "Returns an array of hashes suitable for create_resources to create ssh_authorized_key resources"
) do |vals|
    ret = nil
    file = vals[0]
    unless Puppet::Util.absolute_path?(file)
      raise Puppet::ParseError, "Files must be fully qualified"
    end

    if FileTest.exists?(file)
      keyfile = File.read(file)
      ret = Hash.new
      keyfile.each do |str_key_line|
        key_line = str_key_line.split(/\s/)
        key = Hash.new
        key['ensure'] = 'present'
        key['type'] = key_line[0]
        key['key'] = key_line[1]
        ret[key_line[2]] = key
      end
    end

    if ret
      ret
    else
      raise Puppet::ParseError, "Could not find any files from #{vals.join(", ")}"
    end
end

test.pp

$keys = sshauth_to_hash('/home/supercow/.ssh/authorized_keys')
create_resources('ssh_authorized_key',$keys,{ 'noop' => true, 'user' => 'root' })