Discard useless inbox messages

index.php

@@ -182,7 +182,7 @@
 		//	Number of users
 		$totalItems = count( $following_files );
 
-		//	Create a list of all the followers
+		//	Create a list of all accounts being followed
 		$items = array();
 		foreach ( $following_files as $following_file ) {
 			$following = json_decode( file_get_contents( $following_file ), true );
@@ -242,16 +242,33 @@
 		//	Some servers are very chatty. They send lots of irrelevant messages.
 		//	Before even bothering to validate them, we can delete them.
 
-		//	Lemmy sends lots of announce messages. The object contains details of what the message is.
+		//	Messages from accounts which aren't being followed.
-		if ( is_array( $inbox_message["object"] ) ) { 
+		//	Some servers send delete messages about users we don't follow.
+		//	Lemmy sends messages even after unfollowing or blocking a channel
 
-			if ( match( $inbox_message["object"]["type"]  ) {
+		//	Get a list of every account we follow
-				"Follow", "Undo", "Dislike", "Like" => true,
+		//	Get all the files 
-				default => false,
+		$following_files = glob( $directories["following"] . "/*.json");
-			} ) {
+		
-				//	Discard it, no further processing.
+		//	Create a list of all accounts being followed
-				die();
+		$following_ids = array();
-			}
+		foreach ( $following_files as $following_file ) {
+			$following = json_decode( file_get_contents( $following_file ), true );
+			$following_ids[] = $following["id"];
+		}
+
+		//	Is this from someone we follow?
+		in_array( $inbox_message["actor"], $following_ids ) ? $from_following = true: $from_following = false;
+
+		//	Has the user has been specifically CC'd?
+		if ( isset( $inbox_message["cc"] ) ) {
+			$reply = in_array( "https://{$server}/{$username}", $inbox_message["cc"] );
+		} else {
+			$reply = false;
+		}
+
+		if ( !$reply && !$from_following ) {
+			die();
 		}
  
 		//	Save any Follow, Create, Update, Announce, Like messages