rich text editing, prevent embeded javascript code

Question

I made a website using the famous symfony framework. I wanted to add rich editing feature to it. And I found TinyMCE editor. But there comed a problem: how about the user embed some javascript code into the content? such as alert('hello world').

I tested wordpress, which is a very famous blog software. It faces the same problem. example .

It is no big deal if some one embed an alert script. But what if they embed some dangerous code? Have you encountered the same problem? Should I use markdown instead of html? Any good widget for markdown editing?

Answer 1

最好使用现有的库来清理您的用户输入，即html purifier项目： http : //htmlpurifier.org/似乎维护得很好。

Answer 2

Don't allow any embedded javascript in your user input. This is easy to clean out either on the client or the server. Have a "white list" of HTML tags you support, and remove any event listener attributes from whatever you do allow.