Prefs / view parameter escaping
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                 Key: SHINDIG-89
                 URL: https://issues.apache.org/jira/browse/SHINDIG-89
             Project: Shindig
          Issue Type: Improvement
          Components: Features
            Reporter: Kevin Brown
            Assignee: Kevin Brown


Currently, we do not escape gadgets.Prefs or gadgets.views parameters.

This could potentially result in exploits of data by malicious outside sites.

To remedy this, I propose the attached patch.

As it stands, the spec is silent on the escaping issue, but in practice 
gmodules.com already does this escaping for user prefs and I suspect that other 
container sites do as well.

I've also included an unescaping mechanism that I think should ultimately be 
proposed to the spec discussion group, but that's a later issue.

Feedback is much appreciated. If no one objects, I'll commit this change 
tomorrow morning.

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