From 4a2538967caf5b0f9970cc5f973c16ea5d776aa3 Mon Sep 17 00:00:00 2001
From: Egor Kislitsyn <egor@kislitsyn.com>
Date: Tue, 24 Mar 2020 20:18:27 +0400
Subject: [PATCH] Support pagination in conversations

---
 CHANGELOG.md                                    |  3 +++
 lib/pleroma/web/activity_pub/activity_pub.ex    |  2 +-
 .../controllers/pleroma_api_controller.ex       | 10 +++++-----
 .../controllers/pleroma_api_controller_test.exs | 17 +++++++++++++++++
 4 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15a073c64..905364d7e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Mastodon API: Support for `include_types` in `/api/v1/notifications`.
 </details>
 
+### Fixed
+- Support pagination in conversations API
+
 ## [2.0.0] - 2019-03-08
 ### Security
 - Mastodon API: Fix being able to request enourmous amount of statuses in timelines leading to DoS. Now limited to 40 per request.
diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 30e282840..351d1bdb8 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -696,7 +696,7 @@ def move(%User{} = origin, %User{} = target, local \\ true) do
     end
   end
 
-  defp fetch_activities_for_context_query(context, opts) do
+  def fetch_activities_for_context_query(context, opts) do
     public = [Constants.as_public()]
 
     recipients =
diff --git a/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex b/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
index dae7f0f2f..edb071baa 100644
--- a/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
+++ b/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
@@ -110,12 +110,11 @@ def conversation(%{assigns: %{user: user}} = conn, %{"id" => participation_id})
   end
 
   def conversation_statuses(
-        %{assigns: %{user: user}} = conn,
+        %{assigns: %{user: %{id: user_id} = user}} = conn,
         %{"id" => participation_id} = params
       ) do
-    with %Participation{} = participation <-
-           Participation.get(participation_id, preload: [:conversation]),
-         true <- user.id == participation.user_id do
+    with %Participation{user_id: ^user_id} = participation <-
+           Participation.get(participation_id, preload: [:conversation]) do
       params =
         params
         |> Map.put("blocking_user", user)
@@ -124,7 +123,8 @@ def conversation_statuses(
 
       activities =
         participation.conversation.ap_id
-        |> ActivityPub.fetch_activities_for_context(params)
+        |> ActivityPub.fetch_activities_for_context_query(params)
+        |> Pleroma.Pagination.fetch_paginated(Map.put(params, "total", false))
         |> Enum.reverse()
 
       conn
diff --git a/test/web/pleroma_api/controllers/pleroma_api_controller_test.exs b/test/web/pleroma_api/controllers/pleroma_api_controller_test.exs
index 32250f06f..8bf7eb3be 100644
--- a/test/web/pleroma_api/controllers/pleroma_api_controller_test.exs
+++ b/test/web/pleroma_api/controllers/pleroma_api_controller_test.exs
@@ -169,6 +169,23 @@ test "/api/v1/pleroma/conversations/:id/statuses" do
     id_one = activity.id
     id_two = activity_two.id
     assert [%{"id" => ^id_one}, %{"id" => ^id_two}] = result
+
+    {:ok, %{id: id_three}} =
+      CommonAPI.post(other_user, %{
+        "status" => "Bye!",
+        "in_reply_to_status_id" => activity.id,
+        "in_reply_to_conversation_id" => participation.id
+      })
+
+    assert [%{"id" => ^id_two}, %{"id" => ^id_three}] =
+             conn
+             |> get("/api/v1/pleroma/conversations/#{participation.id}/statuses?limit=2")
+             |> json_response(:ok)
+
+    assert [%{"id" => ^id_three}] =
+             conn
+             |> get("/api/v1/pleroma/conversations/#{participation.id}/statuses?min_id=#{id_two}")
+             |> json_response(:ok)
   end
 
   test "PATCH /api/v1/pleroma/conversations/:id" do