From f4e3f335efb2d81a84d86434afb022b52481979a Mon Sep 17 00:00:00 2001
From: friendica <info@friendica.com>
Date: Wed, 12 Sep 2012 18:53:20 -0700
Subject: [PATCH] don't allow followers to get a post through unless it's a tag
 deliver

---
 include/items.php | 91 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 73 insertions(+), 18 deletions(-)

diff --git a/include/items.php b/include/items.php
index 2f5b5f1f79..f70e96fcbe 100755
--- a/include/items.php
+++ b/include/items.php
@@ -1256,6 +1256,59 @@ function tag_deliver($uid,$item_id) {
 
 
 
+function tgroup_check($uid,$item) {
+
+	$a = get_app();
+
+	$mention = false;
+
+	// check that the message originated elsewhere and is a top-level post
+
+	if(($item['wall']) || ($item['origin']) || ($item['uri'] != $item['parent-uri']))
+		return false;
+
+
+	$u = q("select * from user where uid = %d limit 1",
+		intval($uid)
+	);
+	if(! count($u))
+		return false;
+
+	$community_page = (($u[0]['page-flags'] == PAGE_COMMUNITY) ? true : false);
+	$prvgroup = (($u[0]['page-flags'] == PAGE_PRVGROUP) ? true : false);
+
+
+	$link = normalise_link($a->get_baseurl() . '/profile/' . $u[0]['nickname']);
+
+	// Diaspora uses their own hardwired link URL in @-tags
+	// instead of the one we supply with webfinger
+
+	$dlink = normalise_link($a->get_baseurl() . '/u/' . $u[0]['nickname']);
+
+	$cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism',$item['body'],$matches,PREG_SET_ORDER);
+	if($cnt) {
+		foreach($matches as $mtch) {
+			if(link_compare($link,$mtch[1]) || link_compare($dlink,$mtch[1])) {
+				$mention = true;
+				logger('tgroup_check: mention found: ' . $mtch[2]);
+			}
+		}
+	}
+
+	if(! $mention)
+		return false;
+
+	if((! $community_page) && (! $prvgroup))
+		return false;
+
+
+
+	return true;
+
+}
+
+
+
 
 
 
@@ -1812,6 +1865,12 @@ function consume_feed($xml,$importer,&$contact, &$hub, $datedir = 0, $pass = 0)
 				if($pass == 1)
 					continue;
 
+				// not allowed to post
+
+				if($contact['rel'] == CONTACT_IS_FOLLOWER)
+					continue;
+
+
 				// Have we seen it? If not, import it.
 
 				$item_id  = $item->get_id();
@@ -2086,6 +2145,14 @@ function consume_feed($xml,$importer,&$contact, &$hub, $datedir = 0, $pass = 0)
 					$datarray['owner-avatar'] = $contact['thumb'];
 				}
 
+				// We've allowed "followers" to reach this point so we can decide if they are 
+				// posting an @-tag delivery, which followers are allowed to do for certain
+				// page types. Now that we've parsed the post, let's check if it is legit. Otherwise ignore it. 
+
+				if(($contact['rel'] == CONTACT_IS_FOLLOWER) && (! tgroup_check($importer['uid'],$datarray)))
+					continue;
+
+
 				$r = item_store($datarray);
 				continue;
 
@@ -2708,15 +2775,6 @@ function local_delivery($importer,$data) {
 				}
 
 
-				// TODO: make this next part work against both delivery threads of a community post
-
-//				if((! link_compare($datarray['author-link'],$importer['url'])) && (! $community)) {
-//					logger('local_delivery: received relay claiming to be from ' . $importer['url'] . ' however comment author url is ' . $datarray['author-link'] ); 
-					// they won't know what to do so don't report an error. Just quietly die.
-//					return 0;
-//				}					
-
-				// our user with $importer['importer_uid'] is the owner
 
 				$own = q("select name,url,thumb from contact where uid = %d and self = 1 limit 1",
 					intval($importer['importer_uid'])
@@ -2786,15 +2844,6 @@ function local_delivery($importer,$data) {
 					}
 				}
 
-// 				if($community) {
-//					$newtag = '@[url=' . $a->get_baseurl() . '/profile/' . $importer['nickname'] . ']' . $importer['username'] . '[/url]';
-//					if(! stristr($datarray['tag'],$newtag)) {
-//						if(strlen($datarray['tag']))
-//							$datarray['tag'] .= ',';
-//						$datarray['tag'] .= $newtag;
-//					}
-//				}
-
 
 				$posted_id = item_store($datarray);
 				$parent = 0;
@@ -2864,6 +2913,9 @@ function local_delivery($importer,$data) {
 				$item_id  = $item->get_id();
 				$datarray = get_atom_elements($feed,$item);
 
+				if($importer['rel'] == CONTACT_IS_FOLLOWER)
+					continue;
+
 				$r = q("SELECT `uid`, `last-child`, `edited`, `body` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 					dbesc($item_id),
 					intval($importer['importer_uid'])
@@ -3098,6 +3150,9 @@ function local_delivery($importer,$data) {
 				$datarray['owner-avatar'] = $importer['thumb'];
 			}
 
+			if(($importer['rel'] == CONTACT_IS_FOLLOWER) && (! tgroup_check($importer['importer_uid'],$datarray)))
+				continue;
+
 			$posted_id = item_store($datarray);
 
 			if(stristr($datarray['verb'],ACTIVITY_POKE)) {