From 6b407872b402b72dba48bece5fa69ca5af54f2f0 Mon Sep 17 00:00:00 2001
From: "Haelwenn (lanodan) Monnier" <contact@hacktivis.me>
Date: Mon, 25 Mar 2019 22:19:57 +0100
Subject: [PATCH] mastodon_api_controller.ex: Use min_id in link header instead
 of since_id

---
 .../mastodon_api/mastodon_api_controller.ex   | 21 ++++++++++++-------
 .../mastodon_api_controller_test.exs          |  6 +++---
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index 4d0caecf4..5cc19e68f 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -199,15 +199,20 @@ def custom_emojis(conn, _params) do
   defp add_link_headers(conn, method, activities, param \\ nil, params \\ %{}) do
     params =
       conn.params
-      |> Map.drop(["since_id", "max_id"])
+      |> Map.drop(["since_id", "max_id", "min_id"])
       |> Map.merge(params)
 
     last = List.last(activities)
-    first = List.first(activities)
 
     if last do
-      min = last.id
-      max = first.id
+      max_id = last.id
+
+      limit =
+        params
+        |> Map.get("limit", "20")
+        |> String.to_integer()
+
+      min_id = Enum.at(activities, limit * -1)
 
       {next_url, prev_url} =
         if param do
@@ -216,13 +221,13 @@ defp add_link_headers(conn, method, activities, param \\ nil, params \\ %{}) do
               Pleroma.Web.Endpoint,
               method,
               param,
-              Map.merge(params, %{max_id: min})
+              Map.merge(params, %{max_id: max_id})
             ),
             mastodon_api_url(
               Pleroma.Web.Endpoint,
               method,
               param,
-              Map.merge(params, %{since_id: max})
+              Map.merge(params, %{min_id: min_id})
             )
           }
         else
@@ -230,12 +235,12 @@ defp add_link_headers(conn, method, activities, param \\ nil, params \\ %{}) do
             mastodon_api_url(
               Pleroma.Web.Endpoint,
               method,
-              Map.merge(params, %{max_id: min})
+              Map.merge(params, %{max_id: max_id})
             ),
             mastodon_api_url(
               Pleroma.Web.Endpoint,
               method,
-              Map.merge(params, %{since_id: max})
+              Map.merge(params, %{min_id: min_id})
             )
           }
         end
diff --git a/test/web/mastodon_api/mastodon_api_controller_test.exs b/test/web/mastodon_api/mastodon_api_controller_test.exs
index d9bcbf5a9..f506a847d 100644
--- a/test/web/mastodon_api/mastodon_api_controller_test.exs
+++ b/test/web/mastodon_api/mastodon_api_controller_test.exs
@@ -1371,7 +1371,7 @@ test "getting followers, pagination", %{conn: conn} do
     assert id2 == follower2.id
 
     assert [link_header] = get_resp_header(res_conn, "link")
-    assert link_header =~ ~r/since_id=#{follower2.id}/
+    assert link_header =~ ~r/min_id=#{follower2.id}/
     assert link_header =~ ~r/max_id=#{follower2.id}/
   end
 
@@ -1450,7 +1450,7 @@ test "getting following, pagination", %{conn: conn} do
     assert id2 == following2.id
 
     assert [link_header] = get_resp_header(res_conn, "link")
-    assert link_header =~ ~r/since_id=#{following2.id}/
+    assert link_header =~ ~r/min_id=#{following2.id}/
     assert link_header =~ ~r/max_id=#{following2.id}/
   end
 
@@ -2261,7 +2261,7 @@ test "preserves parameters in link headers", %{conn: conn} do
 
       assert [link_header] = get_resp_header(conn, "link")
       assert link_header =~ ~r/media_only=true/
-      assert link_header =~ ~r/since_id=#{notification2.id}/
+      assert link_header =~ ~r/min_id=#{notification2.id}/
       assert link_header =~ ~r/max_id=#{notification1.id}/
     end
   end