support zot location independent urls

Zotlabs/Lib/ActivityStreams.php

@@ -263,24 +263,8 @@ class ActivityStreams {
 		return self::fetch($url);
 	}
 
-	static function fetch($url) {
-		$redirects = 0;
-		if(! check_siteallowed($url)) {
-			logger('blacklisted: ' . $url);
-			return null;
-		}
-		logger('fetch: ' . $url, LOGGER_DEBUG);
-		$x = z_fetch_url($url, true, $redirects,
-			[ 'headers' => [ 'Accept: application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"' ]]);
-		if($x['success']) {
-			$y = json_decode($x['body'],true);
-			logger('returned: ' . json_encode($y,JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));
-			return json_decode($x['body'], true);
-		}
-		else {
-			logger('fetch failed: ' . $url);
-		}
-		return null;
+	static function fetch($url,$channel = null) {
+		return Activity::fetch($url,$channel);
 	}
 
 	static function is_an_actor($s) {