<div>Hi Bernhard,</div><div><br></div><div>I have a long experience with Smarty and tried a couple of other template engines. Most of them is nothing but PHP written in PHP.</div><div>There are some brilliant exclusions like Slim and Haml in Ruby but both are not implemented in PHP completely.</div>
<div>I consider phtml to be the best option for templates. One can say it is weird for designers but any other non-HTML syntax is weird for designers either.</div><div>It's just my humble opinion. :)</div><div><br></div>
<div>---</div><div>Victor</div><br><div class="gmail_quote">On Tue, Oct 9, 2012 at 5:06 PM, Bernhard Posselt <span dir="ltr"><<a href="mailto:nukeawhale@gmail.com" target="_blank">nukeawhale@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi guys,<br>
<br>
I've ran into multiple problems with the current template engine setup.<br>
<br>
* Lack of documenation:<br>
Since these are only used by Owncloud, we have to maintain the<br>
documentation on the template engine. Using a third party engine would<br>
simplify documentation since we only would have to document how this is<br>
built into Owncloud. Not to mention that there isnt actually any<br>
documentation about the current templating engine at all from what Ive<br>
found (<a href="http://api.owncloud.org/classes/OCP.Template.html" target="_blank">http://api.owncloud.org/classes/OCP.Template.html</a>)<br>
<br>
* Lack of template inheritance:<br>
Currently we can only organize templates by splitting them into<br>
different parts and including them in a Top-Down like fashion. Template<br>
inheritance solves this kinds of problems (an example:<br>
<a href="https://docs.djangoproject.com/en/dev/topics/templates/#template-inheritance" target="_blank">https://docs.djangoproject.com/en/dev/topics/templates/#template-inheritance</a>)<br>
<br>
* Weird and unsafe XSS escaping:<br>
Most important topic for me. We currently escape values when they're<br>
assigned to a template like $tpl->assign('var', $var). If you dont want<br>
to invoke the XSS protection on the variable, you use<br>
$tpl->assign('var', $var, false) which is really weird and non obvious.<br>
Also: What do we escape? IIRC variables and arrays, but what about<br>
objects? We at the news app pass an array with objects to the template<br>
layer. Are the properties escaped? If they are, this could lead to<br>
potential weird behaviour, not to speak of the performance impact<br>
(reflection). As you see, theres no sane way to do XSS escaping when<br>
passing values to the template layer.<br>
<br>
The solution? Easy: escape the values when they are printed to the<br>
template. Most template engines forbid you to use PHP in the templates<br>
(which is a good decision) and provide their own print statements like<br>
Django's {{ variable }} or Rail's <%= variable %>. All printed values<br>
are automatically escaped by default! If you want to prevent escaping<br>
you just use a filter like {{ var|safe }}. The word safe alone gets me<br>
thinking: why is it called safe? What are the risks?<br>
<br>
* Allowing PHP code in templates:<br>
This is not only a security problem stated by the previous point, but<br>
also an invitation to code mess. Allowing PHP code in the template<br>
tempts people to disregard the MVC principles (like for instance doing<br>
database queries in the templates, we have that problem too, I admit),<br>
which makes your templates really inflexible and really hard to change.<br>
Everytime I try to clean up our templates or adjust them, I give up in<br>
frustration because I'd have to adjust all templates, some of which are<br>
generated in a recursive way and thus also very complicated to understand.<br>
<br>
Coming from Django I've looked at two similar engines:<br>
<br>
<a href="http://www.h2o-template.org/" target="_blank">http://www.h2o-template.org/</a><br>
<a href="http://twig.sensiolabs.org/" target="_blank">http://twig.sensiolabs.org/</a><br>
<br>
Both have good documentation, Twig doesnt do autoescaping but theres a<br>
block for that. I'm curious about other suggestions, and it would also<br>
be fine if they could be reviewed from a security context.<br>
<br>
PS: Sorry for the long post, here's a potato<br>
<a href="http://efr0702.files.wordpress.com/2012/03/potato-b.jpg" target="_blank">http://efr0702.files.wordpress.com/2012/03/potato-b.jpg</a><br>
<br>
Cheers<br>
<br>
Bernhard Posselt<br>
<br>
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</blockquote></div><br>