How to safely embed JSON with </script> in HTML document?
In a Rails 3.1 app, how can I safely embed some JSON data into an HTML document?
Suppose I have this in a controller action:
@tags = [
{name:"tag1", color:"green"},
{name:"</script><b>I can do something bad here</b>", color:"red"}
]
And this in a corresponding view:
<script type="text/javascript" charset="utf-8">
//<![CDATA[
var tags_list = <%= @tags.to_json %>;
// ]]>
</script>
Then I get this in resulting HTML:
var tags_list = [
{"name":"tag1","color":"green"},
{"name":"</script><b>I can do something bad here</b>","color":"red"}
];
which triggers a SyntaxError: Unexpected token & in Chrome
If I remove the Rails' default HTML escaping with <%=raw tags.to_json %> , then it returns this:
var tags_list = [
{"name":"tag1","color":"green"},
{"name":"</script><b>I can do something bad here</b>","color":"red"}
];
which, of course, breaks the HTML document with </script> .
Can I somehow tell to_json() method to return something more like this:
var tags_list = [
{"name":"tag1","color":"green"},
{"name":"</script><b>I can do something bad here</b>","color":"red"}
];
I asked this question on rubyonrails-talk mailing list, and I understand now that some people think that's a very bad idea to begin with, but in my case it works very nicely, as long as there are no HTML special chars in the data. So I just want to make the string returned by to_json HTML safe and still have JavaScript parse it properly.
UPDATE: Based on @coreyward comment, I did make it a JS string literal, and that seems to be working great now. Its not quite as elegant of a solution as I was hoping for, but its not too bad either. Here is the code that is working for me:
<% tags = [{name:"tag1", color:"green"}, {name:"</script><b>I can nndo something bad here</b>", color:"red"}] %>
<script type="text/javascript" charset="utf-8">
//<![CDATA[
var tags_list = $.parseJSON('<%=j tags.to_json.html_safe %>');
// ]]>
</script>
which results in:
<script type="text/javascript" charset="utf-8">
//<![CDATA[
var tags_list = $.parseJSON('[{"name":"tag1","color":"green"},{"name":"</script><b>I can nndo something bad here</b>","color":"red"}]');
// ]]>
</script>
Your code using just @tags.to_json works in rails3, if you enable it with:
ActiveSupport.escape_html_entities_in_json = true
Otherwise, your other option is this:
var tags_list = <%= raw @tags.to_json.gsub("</", "</") %>;
This saves the client having to parse the whole thing through $
顺便说一句，这工作，但不是在我看来很好的解决方案：
<script type="text/javascript" charset="utf-8">
//<![CDATA[
var tags_list = <%=raw @tags.to_json.gsub('/', '/') %>;
// ]]>
</script>
I think that if you try this it will work:
var tags_list = "<%== @tags.to_json.gsub('/', '/') %>";
(Notice the double == and the " ")
链接地址: http://www.djcxy.com/p/47928.html