4 files changed, 49 insertions, 2 deletions
diff --git a/lib/pleroma/conversation/participation.ex b/lib/pleroma/conversation/participation.ex
index f1e1a6958..acdee5517 100644
--- a/lib/pleroma/conversation/participation.ex
+++ b/lib/pleroma/conversation/participation.ex
@@ -99,4 +99,24 @@ defmodule Pleroma.Conversation.Participation do
   def get(id) do
     Repo.get(__MODULE__, id)
   end
+
+  def set_recipients(participation, user_ids) do
+    Repo.transaction(fn ->
+      query =
+        from(r in RecipientShip,
+          where: r.participation_id == ^participation.id
+        )
+
+      Repo.delete_all(query)
+
+      users =
+        from(u in User,
+          where: u.id in ^user_ids
+        )
+        |> Repo.all()
+
+      RecipientShip.create(users, participation)
+      :ok
+    end)
+  end
 end
diff --git a/lib/pleroma/web/mastodon_api/views/conversation_view.ex b/lib/pleroma/web/mastodon_api/views/conversation_view.ex
index 38bdec737..5adaecdb0 100644
--- a/lib/pleroma/web/mastodon_api/views/conversation_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/conversation_view.ex
@@ -12,7 +12,7 @@ defmodule Pleroma.Web.MastodonAPI.ConversationView do
   alias Pleroma.Web.MastodonAPI.StatusView
 
   def render("participation.json", %{participation: participation, user: user}) do
-    participation = Repo.preload(participation, conversation: :users)
+    participation = Repo.preload(participation, conversation: :users, recipients: [])
 
     last_activity_id =
       with nil <- participation.last_activity_id do
@@ -37,11 +37,20 @@ defmodule Pleroma.Web.MastodonAPI.ConversationView do
         as: :user
       })
 
+    recipients =
+      AccountView.render("accounts.json", %{
+        users: participation.recipients,
+        as: :user
+      })
+
     %{
       id: participation.id |> to_string(),
       accounts: accounts,
       unread: !participation.read,
-      last_status: last_status
+      last_status: last_status,
+      pleroma: %{
+        recipients: recipients
+      }
     }
   end
 end
diff --git a/lib/pleroma/web/pleroma_api/pleroma_api_controller.ex b/lib/pleroma/web/pleroma_api/pleroma_api_controller.ex
index b677892ed..759d8aef0 100644
--- a/lib/pleroma/web/pleroma_api/pleroma_api_controller.ex
+++ b/lib/pleroma/web/pleroma_api/pleroma_api_controller.ex
@@ -10,6 +10,7 @@ defmodule Pleroma.Web.PleromaAPI.PleromaAPIController do
   alias Pleroma.Conversation.Participation
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.MastodonAPI.StatusView
+  alias Pleroma.Web.MastodonAPI.ConversationView
   alias Pleroma.Repo
 
   def conversation_statuses(
@@ -46,4 +47,20 @@ defmodule Pleroma.Web.PleromaAPI.PleromaAPIController do
       |> render("index.json", %{activities: activities, for: user, as: :activity})
     end
   end
+
+  def update_conversation(
+        %{assigns: %{user: user}} = conn,
+        %{"id" => participation_id, "recipients" => recipients}
+      ) do
+    participation =
+      participation_id
+      |> Participation.get()
+
+    with true <- user.id == participation.user_id,
+         {:ok, _} <- Participation.set_recipients(participation, recipients) do
+      conn
+      |> put_view(ConversationView)
+      |> render("participation.json", %{participation: participation, user: user})
+    end
+  end
 end
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 40298538a..6cdef7e2f 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -263,6 +263,7 @@ defmodule Pleroma.Web.Router do
     scope [] do
       pipe_through(:oauth_write)
       get("/conversations/:id/statuses", PleromaAPIController, :conversation_statuses)
+      patch("/conversations/:id", PleromaAPIController, :update_conversation)
     end
   end