TYPO3 Core

The lately (4.1?) introduced possibily for testing config.linkVars is indeed useful but unfortunately doesn't allow any checking for GET var arrays (only array is respected to allow a whole array to pass) .

This is especially unfortunate because almost any frontend plugin will submit it's GET vars as an array - like &fe_plugin[fe_plugin_getvar]=value.

So I'd suggest to at least enhance linkVars to allow checking if a certain fe_plugin_getvar is allowed, which could be achieved with the attached patch.

With the patch, the TS
config.linkVar = fe_plugin(fe_plugin_getvar1 | fe_plugin_getvar1)
would result in the following:

1) if fe_plugin is a simple non-array GET var, the | will behave as an OR for allowed values (this is indeed the current behaviour without patching; I'm just mentioning it for completeness)
2) if fe_plugin is a GET var array, the | will behave as an OR for allowed array elements fe_plugin_var (i.e. a FE plugin's GET vars) but not it's values (for checking those, more work has still to be done).

Please notice: I found http://bugs.typo3.org/view.php?id=5010 to be stable under several test situations and very useful (indeed essential for avoiding serious performance issues with several linkVars in place). Since the same lines of code are affected, the attached patch includes 0005010_3.patch of #17002
(issue imported from #M5489)