feat(ap): handle Undo(Like) inbound activity

crates/adapters/activitypub-base/src/activities.rs

@@ -279,6 +279,20 @@ impl Activity for UndoActivity {
                     tracing::info!(ap_id = %ap_id_str, "undo Add (watchlist remove)");
                 }
             }
+            "Like" => {
+                if let Some(obj_url_str) = self.object.get("object").and_then(|o| o.as_str())
+                    && let Ok(obj_url) = Url::parse(obj_url_str)
+                    && obj_url.host_str().unwrap_or("") == data.domain
+                {
+                    data.object_handler
+                        .on_unlike(&obj_url, self.actor.inner())
+                        .await
+                        .unwrap_or_else(|e| {
+                            tracing::warn!(error = %e, "failed to process unlike");
+                        });
+                }
+                tracing::info!(actor = %self.actor.inner(), "received Undo(Like)");
+            }
             other => {
                 tracing::debug!(kind = %other, "ignoring Undo of unknown activity type");
             }