Do not add the "next" key to likes.json if there is no more items

lib/pleroma/web/activity_pub/views/object_view.ex

@@ -66,8 +66,10 @@ defmodule Pleroma.Web.ActivityPub.ObjectView do
       "orderedItems" => items
     }
 
-    if offset < total do
+    if offset + length(items) < total do
       Map.put(map, "next", "#{iri}?page=#{page + 1}")
+    else
+      map
     end
   end
 end

test/support/factory.ex

@@ -182,8 +182,8 @@ defmodule Pleroma.Factory do
     }
   end
 
-  def like_activity_factory do
-    note_activity = insert(:note_activity)
+  def like_activity_factory(attrs \\ %{}) do
+    note_activity = attrs[:note_activity] || insert(:note_activity)
     object = Object.normalize(note_activity)
     user = insert(:user)
 

test/web/activity_pub/activity_pub_controller_test.exs

@@ -180,18 +180,65 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
   end
 
   describe "/object/:uuid/likes" do
-    test "it returns the like activities in a collection", %{conn: conn} do
+    setup do
       like = insert(:like_activity)
       like_object_ap_id = Object.normalize(like).data["id"]
-      uuid = String.split(like_object_ap_id, "/") |> List.last()
 
+      uuid =
+        like_object_ap_id
+        |> String.split("/")
+        |> List.last()
+
+      [id: like.data["id"], uuid: uuid]
+    end
+
+    test "it returns the like activities in a collection", %{conn: conn, id: id, uuid: uuid} do
       result =
         conn
         |> put_req_header("accept", "application/activity+json")
         |> get("/objects/#{uuid}/likes")
         |> json_response(200)
 
-      assert List.first(result["first"]["orderedItems"])["id"] == like.data["id"]
+      assert List.first(result["first"]["orderedItems"])["id"] == id
+      assert result["type"] == "OrderedCollection"
+      assert result["totalItems"] == 1
+      refute result["first"]["next"]
+    end
+
+    test "it does not crash when page number is exceeded total pages", %{conn: conn, uuid: uuid} do
+      result =
+        conn
+        |> put_req_header("accept", "application/activity+json")
+        |> get("/objects/#{uuid}/likes?page=2")
+        |> json_response(200)
+
+      assert result["type"] == "OrderedCollectionPage"
+      assert result["totalItems"] == 1
+      refute result["next"]
+      assert Enum.empty?(result["orderedItems"])
+    end
+
+    test "it contains the next key when likes count is more than 10", %{conn: conn} do
+      note = insert(:note_activity)
+      insert_list(11, :like_activity, note_activity: note)
+
+      uuid =
+        note
+        |> Object.normalize()
+        |> Map.get(:data)
+        |> Map.get("id")
+        |> String.split("/")
+        |> List.last()
+
+      result =
+        conn
+        |> put_req_header("accept", "application/activity+json")
+        |> get("/objects/#{uuid}/likes?page=1")
+        |> json_response(200)
+
+      assert result["totalItems"] == 11
+      assert length(result["orderedItems"]) == 10
+      assert result["next"]
     end
   end