Template Conditionals

This is essentially a more restrictive version of my PHP in Templates plugin.  The restrictions aim to make this a "safe" plugin to use, that is, doesn't allow arbitrary PHP execution, but still gives the benefits of template conditionals.

You may notice that this still uses the "phptpl" name, and thus, is incompatible with the PHP in Templates plugin.  Both plugins are very similar though.  The differences between this and the other plugin are:

• Admins cannot enter PHP code using <?php ?> tags
• Conditionals in <if> and <elseif> tags are checked to ensure that they are "safe" (see below)
• file_get_contents function has been removed from the allowable <func ...>...</func> shortcuts
• There's a new <?=...?> tag to print out the result of a "safe" PHP expression; although this is a tag, only PHP expressions may exist inside (do not terminate expressions with a semicolon), so you cannot nest other tags inside this
  Example (prints 123654321):
  HTML Code

  123<?=substr("987654321", 3)?>

  ---

• There's also a new <setvar name>...</setvar> tag which can set variables; for safety reasons, these are actually stored in a $tplvars array.  Examples:
  (just prints some text)
  
  HTML Code

  <setvar uselesstext>"some text"</setvar> {$tplvars['uselesstext']}

  ---

  (prints out the username of the user with UID of 2)
  

  HTML Code

  <setvar user2>get_user(2)</setvar> <func htmlspecialchars_uni>{$tplvars['user2']['username']}</func>

  ---

v1.0-1.3 of this plugin is based off v1.7 of PHP in Templates.
As of v1.8, PHP 5.3 or later is required.
This plugin can be used with the Admin Security plugin.

"Safe expressions"
This plugin implements "safe expression" checking; essentially, this does impose a bit of a performance hit, but, on the other hand, tries to ensure no "bad PHP" gets executed.
For more information on what I consider to be a "safe expression", see my blog post here.
For the purposes of this plugin, all valid PHP expressions are allowed, as long as they don't infringe on any of the following conditions:

• no assignment/modification operators (=, +=, |=, ++ etc) allowed
• no statements such as include, exit, eval etc are allowed
• no special constants such as PHP_OS, PHP_LIBDIR etc are allowed
• backtick (`) operator not allowed
• heredoc type strings not allowed (takes too much effort to handle) - use double quoted strings instead
• double quoted strings may not contain the "{" character (takes too much effort to handle) - use string concatenation instead
• array and object typecasting not allowed
• no variable functions or method calls allowed
• single line comments (//, #) not allowed
• only some functions are allowed - see inc/plugins/phptpl_allowed_funcs.txt for a list of allowed functions
  

[ZiNgA BuRgA]

str_replace isn't a valid function allowable inside the <func> tag

(03-14-2010 10:12 AM)ZiNgA BuRgA Wrote:  The functions available, with the shortcut, are:
htmlspecialchars, htmlspecialchars_uni, intval, file_get_contents, floatval, urlencode, rawurlencode, addslashes, stripslashes, trim, crc32, ltrim, rtrim, chop, md5, nl2br, strrev, strtoupper, strtolower, my_strtoupper, my_strtolower, alt_trow, get_friendly_size, filesize, strlen, my_strlen, my_wordwrap, random_str, unicode_chr, bin2hex, str_rot13, str_shuffle, strip_tags, ucfirst, ucwords, basename, dirname, unhtmlentities

Try

Code:

<?=str_replace("\n", ', ', $post['fid6'])?>

---

[Victor]

Simple 2 words: Thank you.

[ZiNgA BuRgA]

Updated to v1.7 - fixes a possible function call exploit.

[ahstanford]

How would I get the following to work?

Code:

<if {$mybb->user['avatar']} != '' then> <div class="avatar" style="background-image:url('{$mybb->user['avatar']}');"></div> </if>

---

[RateU]

Something like this:

Code:

<if $mybb->user['avatar'] != '' then><div class="avatar" style="background-image:url('{$mybb->user['avatar']}');"></div></if>

---

[ahstanford]

(12-12-2012 06:08 AM)RateU Wrote:  Something like this:

Code:

<if $mybb->user['avatar'] != '' then><div class="avatar" style="background-image:url('{$mybb->user['avatar']}');"></div></if>

---

Ah, thanks. Just had to drop those curly brackets.

[charafweb]

Hi,
Is this plugin doesn't slow down the board?
Thanks

[ZiNgA BuRgA]

What?
Define "slow down the board".

[charafweb]

(01-31-2013 09:25 AM)ZiNgA BuRgA Wrote:  What?
Define "slow down the board".

what I mean: is this plugin does not affect (negatively) site performance (by adding a lot of work to CPU) when used many times in templates? (I hope I'm clear now)

sorry for my bad english.

[ZiNgA BuRgA]

It depends on what you mean by "a lot of work" (PHP script execution time? additional CPU cycles? memory usage?), as well as what you mean by "used many times" (ten instances? a hundred instances? what templates? what code?).

Pretty much all plugins will have a negative effect on site performance.  It's up to you whether you think the trade off is worth it.