4 files changed, 56 insertions, 0 deletions
diff --git a/lib/pleroma/conversation.ex b/lib/pleroma/conversation.ex
index bc97b39ca..fb0dfedca 100644
--- a/lib/pleroma/conversation.ex
+++ b/lib/pleroma/conversation.ex
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Conversation do
   alias Pleroma.Conversation.Participation
+  alias Pleroma.Conversation.Participation.RecipientShip
   alias Pleroma.Repo
   alias Pleroma.User
   use Ecto.Schema
@@ -39,6 +40,15 @@ defmodule Pleroma.Conversation do
     Repo.get_by(__MODULE__, ap_id: ap_id)
   end
 
+  def maybe_set_recipients(participation, activity) do
+    participation = Repo.preload(participation, :recipients)
+
+    if participation.recipients |> Enum.empty?() do
+      recipients = User.get_all_by_ap_id(activity.recipients)
+      RecipientShip.create(recipients, participation)
+    end
+  end
+
   @doc """
   This will
   1. Create a conversation if there isn't one already
@@ -60,6 +70,7 @@ defmodule Pleroma.Conversation do
           {:ok, participation} =
             Participation.create_for_user_and_conversation(user, conversation, opts)
 
+          maybe_set_recipients(participation, activity)
           participation
         end)
 
diff --git a/lib/pleroma/conversation/participation.ex b/lib/pleroma/conversation/participation.ex
index 77b3f61e9..121efb671 100644
--- a/lib/pleroma/conversation/participation.ex
+++ b/lib/pleroma/conversation/participation.ex
@@ -5,6 +5,7 @@
 defmodule Pleroma.Conversation.Participation do
   use Ecto.Schema
   alias Pleroma.Conversation
+  alias Pleroma.Conversation.Participation.RecipientShip
   alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
@@ -17,6 +18,9 @@ defmodule Pleroma.Conversation.Participation do
     field(:read, :boolean, default: false)
     field(:last_activity_id, Pleroma.FlakeId, virtual: true)
 
+    has_many(:recipient_ships, RecipientShip)
+    has_many(:recipients, through: [:recipient_ships, :user])
+
     timestamps()
   end
 
diff --git a/lib/pleroma/conversation/participation_recipient_ship.ex b/lib/pleroma/conversation/participation_recipient_ship.ex
new file mode 100644
index 000000000..27c0c89cd
--- /dev/null
+++ b/lib/pleroma/conversation/participation_recipient_ship.ex
@@ -0,0 +1,34 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Conversation.Participation.RecipientShip do
+  use Ecto.Schema
+
+  alias Pleroma.Conversation.Participation
+  alias Pleroma.User
+  alias Pleroma.Repo
+
+  import Ecto.Changeset
+
+  schema "conversation_participation_recipient_ships" do
+    belongs_to(:user, User, type: Pleroma.FlakeId)
+    belongs_to(:participation, Participation)
+  end
+
+  def creation_cng(struct, params) do
+    struct
+    |> cast(params, [:user_id, :participation_id])
+    |> validate_required([:user_id, :participation_id])
+  end
+
+  def create(%User{} = user, participation), do: create([user], participation)
+
+  def create(users, participation) do
+    Enum.each(users, fn user ->
+      %__MODULE__{}
+      |> creation_cng(%{user_id: user.id, participation_id: participation.id})
+      |> Repo.insert!()
+    end)
+  end
+end
diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index 6e2fd3af8..a021e77f0 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -450,6 +450,13 @@ defmodule Pleroma.User do
     Repo.get_by(User, ap_id: ap_id)
   end
 
+  def get_all_by_ap_id(ap_ids) do
+    from(u in __MODULE__,
+      where: u.ap_id in ^ap_ids
+    )
+    |> Repo.all()
+  end
+
   # This is mostly an SPC migration fix. This guesses the user nickname by taking the last part
   # of the ap_id and the domain and tries to get that user
   def get_by_guessed_nickname(ap_id) do