webmention.rb

  def set_from_html(html)

    parser = Hpricot(html)

    title = parser.at("title")
    self.title ||= ActionView::Base.full_sanitizer.sanitize(title.inner_html).strip unless title.blank?

    meta = parser.at("meta[@name='description']") || parser.at("meta[@property='og:description']") || parser.at("meta[@itemprop=description]") || parser.at("meta[@name='Description']")
    self.excerpt ||= meta[:content] unless meta.nil?

    author = parser.at("a[@rel=author]")
    unless author.blank?
      self.author_name ||= ActionView::Base.full_sanitizer.sanitize(author.inner_html).strip
      self.author_url ||= source_base_url(author[:href])
    end

    author_icon = author.at("img")
    self.author_avatar_url ||= source_base_url(author_icon[:src]) unless author_icon.nil?

    icon = parser.at("link[@rel=apple-touch-icon-precomposed]") || parser.at("link[@rel=apple-touch-icon]")
    self.author_avatar_url ||= source_base_url(icon[:href]) unless icon.nil?
    
    self.kind = "reply" unless parser.at("[@rel=in-reply-to]").nil?
  end
  
  def source_base_url(url)
    URI.join(self.source_uri.gsub(URI.parse(self.source_uri).request_uri, ""), url).to_s
  end