Friday, March 23, 2012

Re: HTML-safety best practices

Okay that makes sense, thanks for the help!

-Dave

On Mar 21, 9:48 am, Thomas Broyer <t.bro...@gmail.com> wrote:
> On Wednesday, March 21, 2012 4:15:10 PM UTC+1, dhoffer wrote:
>
> > I have a few questions about this.
>
> > If I change to:
>
> > interface Template extends SafeHtmlTemplates {
> >         @Template("<img src=\"{0}\"/>")
> >         SafeHtml img(SafeUri safeUri);
> > }
>
> > 1. How does the template know to call asString() on the safeUri
> > instance?
>
> SafeHtmlTemplates knows about SafeUri (remember the warning it outputs when
> you use String? ;-) )
>
> > 2. With this change I now have the same problem but in the SafeUri
> > implementation.  How do I take a URL variable and sanitize it so it's
> > safe?
>
> UriUtils.fromString()http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/googl...)
>
> > Or because these URL's come from the server can I just declare
> > them safe by convention.
>
> No. Only those URLs that are hard-coded in your client-side app can be
> trusted.
>
> > 3.  How do I get rid of the compiler warning?  Once I've manually made
> > these safe is there a way to annotate the @Template usage so the
> > compiler knows it's safe?
>
> The only way to shut the generator up is to use SafeUri and SafeStyles when
> it tells you to do so.

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