<?php

class ContactPageHooks
{
    public static function onBeforePageDisplay(OutputPage $out, Skin $skin)
    {
        // Only inject the recaptcha script on Special:Contact
        if ($skin->getRelevantTitle()->prefixedText == "Special:Contact") {
            $out->addScriptFile('https://www.google.com/recaptcha/api.js');
        }
    }
}