Change module settings via API

[nurkka]

Hi,

the output of a CKEditor field is postprocessed by the MarkupHTMLPurifier module, which has no configuration settings in the backend. I want to tweak the html output, so I'm trying to change the MarkupHTMLPurifier settings. The easiest method would be, to change one line in MarkupHTMLPurifier.module, but I want to be save when updating ProcessWire. So I had the idea to change the module settings on runtime. To achieve that, I wrote following module:

class configModifer extends WireData implements Module {

	public static function getModuleInfo() {
		return array(
			'title' => 'Config Modifier Test',
			'version' => 1,
			'summary' => 'This module tries to change the settings of another module on runtime.',
			'singular' => true,
			'autoload' => true,
		);
	}
	
	public function init() {
		$this->addHookBefore('Inputfield::render', $this, 'beforeInputFieldRender');
	}
	
	public function beforeInputFieldRender (HookEvent $event) {
		$purifier = wire()->modules->get('MarkupHTMLPurifier');
		$purifier->set('HTML.Doctype', 'HTML 4.01 Transitional');
	}

}

Unfortunately this doesn't work. The Hook is called, but it doesn't change the settings of MarkupHTMLPurifier.

How can I change the module settings of MarkupHTMLPurifier on runtime? Or is there another way to achieve that?

Thanks in advance.
 

[LostKobrakai]

Edit:

Should have read completely before posting, but I can say, that probably your hook is wrong. CKEditor is using a iframe for it's content, so there shouldn't be a inputfield present. 

[nurkka]

You're right, it was the wrong hook. Now I'm using InputfieldCKEditor::processInput, but still don't get the right instance of MarkupHTMLPurifier.

Next, I took a closer look at the code of InputfieldCKEditor.module and I tried to replace the hook method:

public function ___processInput(WireInputData $input) {

	$value = trim($input[$this->name]);
	if($value == self::PLACEHOLDER_TEXT) return $this; // ignore value

	$value = $this->purifyValue($value);

	if($value != $this->attr('value')) {
		$this->trackChange('value');
		$this->setAttribute('value', $value);
	}

	return $this;
}

The MarkupHTMLPurifier module is instantiated in the $this->purifyValue()-Method:

if(is_null(self::$purifier)) self::$purifier = $this->wire('modules')->get('MarkupHTMLPurifier');

Is there any way to get self::$purifier from »outside«, i.e. from a hook method?

If not, is it possible to replace the whole processInput-Method and call a custom instance of MarkupHTMLPurifier? I tried to do that, but it didn't work:

public function hookMethod (HookEvent $event) {

	$this->message("Hook InputfieldCKEditor::processInput"); // the hook is called correctly

	$event->replace = true; // force replace the hook method

	$field = $event->object;
	$arguments = $event->arguments;

// now I tried to adapt the code of the original method, but it didn't work.

	$value = trim($event->arguments[$field->name]);
	if($value == self::PLACEHOLDER_TEXT) return $field;

	$value = $field->purifyValue($value);

	if($value != $field->attr('value')) {
		$field->trackChange('value');
		$field->setAttribute('value', $value);
	}

	return $field;
	
}

I think that must be possible, but how is it done correctly?