public static function get_allowed_domains() {
		$domains = array(
			site_url(),
			'creativecommons.org',
			'inkscape.org',
			'sodipodi.sourceforge.net',
			'w3.org',
		);

		$domains = apply_filters('blobmimes_svg_allowed_domains', $domains);
		if (!is_array($domains) || !count($domains)) {
			return array();
		}

		// Sanitize the list before moving on.
		foreach ($domains as $k=>$domain) {
			if (false === ($domains[$k] = static::sanitize_domain($domain))) {
				unset($domains[$k]);
			}
		}

		// Pre-sorting will speed up looped checks.
		$domains = array_unique($domains);
		sort($domains);
		return $domains;
	}