Script to download all attachments from a basecamp project

import_attachment_basecamp.rb

require 'faraday'
require 'faraday_middleware'

url_project = 'https://ciblonet.basecamphq.com'
project_id = 3684800
user_name = 'shingara'
password = 'xxxx'

class Attachment

  def initialize(conn, attachment)
    @conn = conn
    @attachment = attachment
  end

  def collection
    @attachment['collection'].to_s
  end

  def dir
    Dir.mkdir(collection) unless Dir.exists?(collection)
    collection
  end

  def fetch
    File.new(File.join(dir, @attachment['name']), 'w').write(@conn.get(@attachment['download_url']).body)
  end
end

class Attachments
  def initialize(conn, project_id, step=nil)
    @conn = conn
    @project_id = project_id
    @attachments_index = 100
    @step = step
  end

  def url
    if @step
      "/projects/#{@project_id}/attachments.xml?n=#{@step}"
    else
      "/projects/#{@project_id}/attachments.xml"
    end
  end

  def entries
    @entries ||= @conn.get(url) do |req|
      req.headers['Accept'] = 'application/xml'
      req.headers['Content-Type'] = 'application/xml'
    end.body['attachments']
  end

  def fetch
    entries.each do |attachment|
      Attachment.new(@conn, attachment).fetch
    end
  end

  def more?
    entries.size > 99
  end
end


class FetchAttachments

  def self.execute(conn, project_id)
    a = Attachments.new(conn, project_id)
    a.fetch
    step = 100
    while a.more?
      a = Attachments.new(conn, project_id, step)
      a.fetch
      step += 100
    end
  end
end

con = Faraday.new(:url => url_project) do |builder|
  builder.use Faraday::Request::BasicAuthentication, user_name, password
  builder.use Faraday::Response::Logger
  builder.response :xml,  :content_type => /\bxml$/
  builder.use Faraday::Adapter::NetHttp
end

FetchAttachments.execute(con, project_id)