Ignore certain messages. Prevent duplicate updates being saved

index.php

@@ -296,6 +296,12 @@
 			//	Some servers are very chatty. They send lots of irrelevant messages.
 			//	Before even bothering to validate them, we can delete them.
 
+			//	This server doesn't handle Add, Remove, or Reject
+			//	See https://www.w3.org/wiki/ActivityPub/Primer
+			if ( "Add" == $inbox_type || "Remove" == $inbox_type || "Reject" == $inbox_type ) { 
+				die(); 
+			}
+
 			//	Messages from accounts which aren't being followed.
 			//	Some servers send delete messages about users we don't follow.
 			//	Lemmy sends messages even after unfollowing or blocking a channel
@@ -335,6 +341,7 @@
 				$reply = false;
 			}
 
+			//	As long as one of these is true, the server will process it
 			if ( !$reply && !$from_following && !$from_follower ) {
 				//	Don't bother processing it at all.
 				die();
@@ -1750,11 +1757,6 @@ HTML;
 				break;
 			}
 		}
-		
-		//	If the message is valid, save the message in `/data/inbox/`
-		$uuid = uuid( $message );
-		$filename = $uuid . "." . urlencode( $type ) . ".json";
-		file_put_contents( $directories["inbox"] . "/{$filename}", json_encode( $message ) );
 	}
 
 //	"One to stun, two to kill, three to make sure"