pagecontent/app/controllers/page_contents_controller.rb

class PageContentsController < OrbitAdminController
  require 'uri'

  IMG_INFO = {}

  def index
    params = OrbitHelper.params
    if params["wiki"].present?
      page = WikiPage.where(:uid => params["wiki"].to_s).first
      page.view_count += 1
      page.save
      name = page.name rescue ""
      html = page.content rescue ""
      url_to_edit = OrbitHelper.user_can_edit?(page) ? "/admin/wiki_pages/#{page.id}/edit?page_id=#{page.page.id.to_s}" : ""
    else
      page = Page.where(:page_id => params[:page_id].to_s).first
      name = page.name rescue ""
      html = page.page_contexts.order(:version=>-1).first.content rescue ""
      url_to_edit = OrbitHelper.user_can_edit?(page) ? "/admin/page_contents/new?page_id=#{page.id.to_s}" : ""
    end
    request = OrbitHelper.request
    meta_desc = html.nil? ? "" : ActionView::Base.full_sanitizer.sanitize(html)[0..200]
    doc = Nokogiri::HTML( html )
    img_srcs = doc.css('img').map{ |i| i['src'] }.compact
    metas = [{"property" => "og:description", "content" => meta_desc},{"property" => "og:type", "content" => "Article"}]
    if img_srcs.count > 0
      img_src = img_srcs[0]
      metas << {"property" => "og:image", "content" => URI.join(request.base_url, URI.encode(img_src)).to_s}
      if img_src.start_with?('/')
        img_src_path = File.join('public', img_src)
        img_src_path = URI.decode(img_src_path)
        if File.exist?(img_src_path)
          image = MiniMagick::Image.open(img_src_path)
          if image[:width]
            metas << {"property" => "og:image:width", "content" => image[:width].to_s}
          end
          if image[:height]
            metas << {"property" => "og:image:height", "content" => image[:height].to_s}
          end
        end
      else
        res = get_response(URI.parse(img_src))
        image = IMG_INFO[img_src]
        if image.nil?
          if res.code == "200"
            image_file = Tempfile.new
            image_file.binmode
            image_file.write(res.body)
            begin
              image = MiniMagick::Image.open(image_file.path)
              IMG_INFO[img_src] = {width: image[:width], height: image[:height]}
              if image[:width]
                metas << {"property" => "og:image:width", "content" => image[:width].to_s}
              end
              if image[:height]
                metas << {"property" => "og:image:height", "content" => image[:height].to_s}
              end
              image_file.close
              image_file.unlink
            rescue MiniMagick::Invalid => e
              puts ["src = #{img_src}", e.to_s]
            end
          else
            IMG_INFO[img_src] = {}
          end
        else
          if image[:width]
            metas << {"property" => "og:image:width", "content" => image[:width].to_s}
          end
          if image[:height]
            metas << {"property" => "og:image:height", "content" => image[:height].to_s}
          end
        end
      end
    end
    OrbitHelper.render_meta_tags(metas)

    {
      "html" => html,
      "title" => name,
      "view_count" => (page.view_count rescue ""),
      "view-count-head" =>t('page_content.view_count'),
      "url_to_edit" => url_to_edit
    }
  end

private
  def net_http_get_response(uri,headers={})
    port = uri.port
    host = uri.host
    http = Net::HTTP.new(host, port)
    scheme = uri.scheme
    if scheme == "https" || port.to_i == 443
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
      http.use_ssl = true
    end
    http.open_timeout = 5
    relative_path = (uri.path.blank? ? "/" : uri.path)
    if !relative_path.start_with?("http") && !relative_path.start_with?("/")
      relative_path = "/" + relative_path
    end
    relative_path = relative_path.sub(/^\/\.\.\/(\.\.\/)*/,'/')
    while relative_path.include?("/../") do
      relative_path = relative_path.gsub(/\/[^\/]+\/\.\.\//,'/')
    end
    relative_path = relative_path.gsub('//','/')
    relative_path = URI.decode(relative_path)
    relative_path += (uri.query.blank? ? '' : "?#{URI.decode(uri.query)}")
    res = http.get(relative_path.gsub(" ","%20"))
    if res.code == "400"
      res = http.get(URI.encode(relative_path.gsub(" ","%20")))
    end
    res.uri = uri
    res
  end
  def get_response(uri)
    res = net_http_get_response(uri)
    if res.code == "301" || res.code == "302"
      location = res['Location']
      cookie = res['Set-Cookie']  
      headers = {
        'Cookie' => cookie.to_s
      }
      if location[0] == "/"
          uri = URI.parse("#{uri.scheme}://#{uri.host}#{location}")
      else
          uri = URI.parse(location)
      end
      res = net_http_get_response(uri,headers)
    end
    return res
  end
end