fix home feed

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/Contacts.swift

@@ -214,10 +214,15 @@ func is_friend_event(_ ev: NostrEvent, our_pubkey: String, contacts: Contacts) -
         return true
     }
     
-    let pks = ev.referenced_pubkeys
+    let pks = get_referenced_id_set(tags: ev.tags, key: "p")
+    
+    // reply to self
+    if pks.count == 0 {
+        return true
+    }
     
     // allow reply-to-self-or-friend case
-    if pks.count == 1 && contacts.is_friend(pks[0].ref_id) {
+    if pks.count == 1 && contacts.is_friend(pks.first!.ref_id) {
         return true
     }
     

damus/Nostr/NostrEvent.swift

@@ -19,7 +19,7 @@ struct KeyEvent {
     let relay_url: String
 }
 
-struct ReferencedId: Identifiable {
+struct ReferencedId: Identifiable, Hashable {
     let ref_id: String
     let relay_id: String?
     let key: String
@@ -364,6 +364,18 @@ func get_referenced_ids(tags: [[String]], key: String) -> [ReferencedId] {
     }
 }
 
+func get_referenced_id_set(tags: [[String]], key: String) -> Set<ReferencedId> {
+    return tags.reduce(into: Set()) { (acc, tag) in
+        if tag.count >= 2 && tag[0] == key {
+            var relay_id: String? = nil
+            if tag.count >= 3 {
+                relay_id = tag[2]
+            }
+            acc.insert(ReferencedId(ref_id: tag[1], relay_id: relay_id, key: key))
+        }
+    }
+}
+
 func make_first_contact_event(keypair: Keypair) -> NostrEvent? {
     guard let privkey = keypair.privkey else {
         return nil