在页面呈现后，将 nofollow 属性添加到每个具有外部 link 的 <a> 标签

Question

客户要求我们的 sitecore 解决方案中所有指向外部页面的链接都应具有 nofollow 属性。我应该使用哪个管道来访问响应 html（在将链接与标记一起发送到浏览器之前更改链接）？或者有没有更好的解决方案来完成这个？

JavaScript 在这里没有太大帮助，因为我不确定是否所有搜索引擎都能够运行 JavaScript.

RenderField 处理器也不可用，因为我们的代码中有很多自定义标签

Answer 1

您可以使用 Sitecore.Pipelines.HttpRequest 并在 ExecuteRequest 之后打补丁。

此时您已经完全呈现 html，包括来自 HTML 缓存的所有缓存组件。

编辑添加示例：

#region Using
using System;
using System.IO;

using Sitecore.Pipelines.HttpRequest;

#endregion

namespace MySpace.Sitecore.Pipelines
{

    public class MyProcessor : HttpRequestProcessor
    {

        public override void Process(HttpRequestArgs args)
        {

            if (!global::Sitecore.Context.PageMode.IsPageEditor)
            {
                if (!args.Context.Request.RawUrl.Contains(".") || (args.Context.Request.RawUrl.ToLower().Contains(".aspx") && !args.Context.Request.RawUrl.ToLower().StartsWith("/sitecore")))
                {
                    args.Context.Response.Filter = new MyInterestFilter(args.Context.Response.Filter);
                }
            }
        }

        #region Stream filter

        public class MyInterestFilter : Stream
        {

            public MyInterestFilter(Stream sink)
            {
                _sink = sink;
            }

            private Stream _sink;

            #region Properites

            public override bool CanRead
            {
                get { return true; }
            }

            public override bool CanSeek
            {
                get { return true; }
            }

            public override bool CanWrite
            {
                get { return true; }
            }

            public override void Flush()
            {
                _sink.Flush();
            }

            public override long Length
            {
                get { return 0; }
            }

            private long _position;

            public override long Position
            {
                get { return _position; }
                set { _position = value; }
            }

            #endregion

            #region Methods

            public override int Read(byte[] buffer, int offset, int count)
            {
                return _sink.Read(buffer, offset, count);
            }

            public override long Seek(long offset, SeekOrigin origin)
            {
                return _sink.Seek(offset, origin);
            }

            public override void SetLength(long value)
            {
                _sink.SetLength(value);
            }

            public override void Close()
            {
                _sink.Close();
            }

            public override void Write(byte[] buffer, int offset, int count)
            {
                byte[] data = new byte[count];
                Buffer.BlockCopy(buffer, offset, data, 0, count);
                string html = System.Text.Encoding.Default.GetString(buffer);

                html = MyReplace(html);

                byte[] outdata = System.Text.Encoding.Default.GetBytes(html);
                _sink.Write(outdata, 0, outdata.GetLength(0));
            }

            public static string MyReplace(string html)
            {

                 html = html.Replace("TESTSTRING", "REPLACEDTESTSTRING");

                return html;
            }

            #endregion

        }

        #endregion

    }
}

并在 App_Config 包含目录中设置补丁文件，如下所示：

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
      <httpRequestBegin>
        <processor type="MySpace.Sitecore.Pipelines.MyProcessor, MySpace.Sitecore" patch:after="processor[@type='Sitecore.Pipelines.HttpRequest.ExecuteRequest, Sitecore.Kernel']"/>
      </httpRequestBegin>
    </pipelines>
  </sitecore>
</configuration>

在页面呈现后，将 nofollow 属性添加到每个具有外部 link 的 <a> 标签

Add nofollow attribute to each <a> tag with external link after the page was rendered

sitecore

sitecore6

sitecore7

sitecore7.2