Module: CdnHelpers::HtmlRewriter

Defined in:
lib/cdn_helpers.rb

Class Method Summary collapse

Class Method Details

.process_asset_url(href, file_path, public_root_path, logger) ⇒ Object 



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# File 'lib/cdn_helpers.rb', line 49

def self.process_asset_url(href, file_path, public_root_path, logger)
  local_url = Pathname.new(href)
  url_prefix = "/"
  if local_url.relative?
    logger.warn "We don't yet support relative paths to assets: #{local_url}"
    return href
  else
    local_url = local_url.to_s[(url_prefix.length - 1)..-1] if local_url.to_s.index(url_prefix) == 0
    file_path = public_root_path.join(local_url[1..-1]).cleanpath.relative_path_from(public_root_path).to_s
  end
  return "#{url_prefix[0..-2]}#{CdnHelpers::AssetPath.hash_file("/" + file_path, public_root_path, logger)}"
end

.process_document(html, file_path, public_root_path, asset_hosts, logger) ⇒ Object 



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# File 'lib/cdn_helpers.rb', line 62

def self.process_document(html, file_path, public_root_path, asset_hosts, logger)
  to_handle = {
    "link[rel=stylesheet]" => "href",
    "script[src]" => "src",
    "img" => "src",
    'link[rel="shortcut icon"]' => "href"
  }
  
  to_handle.each do |selector, attribute|        
    html.search(selector).each do |elem|
      if URI.parse(elem[attribute]).scheme.nil?
        elem[attribute] = asset_hosts.sample + process_asset_url(elem[attribute], file_path, public_root_path, logger)
      end
    end
  end
  
  # The contents of any style elements should be processed as CSS files
  require 'stringio'
  html.search('style').each do |elem|
    pseudo_css_file = StringIO.new(elem.content)
    processed_css = CssRewriter.process_css_file(logger, pseudo_css_file, file_path, public_root_path, asset_hosts.sample + "/")
    elem.content = processed_css
  end

  html
end

.rewrite_file(logger, file_path, public_root_path, asset_hosts) ⇒ Object 



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# File 'lib/cdn_helpers.rb', line 42

def self.rewrite_file(logger, file_path, public_root_path, asset_hosts)
  html_content = open(file_path).read
  html = Nokogiri::HTML.parse(html_content)
  process_document(html, file_path, public_root_path, asset_hosts, logger)  
  File.open(file_path, 'w') { |f| f << html.to_s }
end