patriciomacadden/simple_gravatar

require 'digest'

module SimpleGravatar
  DEFAULT_OPTIONS = {
    default: nil,
    forcedefault: false,
    rating: :g,
    secure: false,
    size: 48
  }

  def gravatar_url(email, options = {})
    options = DEFAULT_OPTIONS.merge options
    secure = options.delete :secure

    unless options[:forcedefault]
      options.delete :forcedefault
    end

    gravatar_id = Digest::MD5.hexdigest email.to_s.downcase

    params = options.collect { |k, v| "#{k}=#{v}" }.join '&'

    url = if secure
      'https://secure.gravatar.com/avatar'
    else
      'http://gravatar.com/avatar'
    end

    "#{url}/#{gravatar_id}.png?#{params}"
  end
end