Refactor conversation function in MastodonAPIController to use a View
[akkoma] / lib / pleroma / web / mastodon_api / mastodon_api_controller.ex
index 88e0249a60672bdd0613d85ff51c3dc21559b816..d5b6a943f24bee28441d0ee5f89760c54e25e42b 100644 (file)
@@ -5,25 +5,31 @@
 defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   use Pleroma.Web, :controller
 
+  alias Ecto.Changeset
   alias Pleroma.Activity
   alias Pleroma.Config
+  alias Pleroma.Conversation.Participation
   alias Pleroma.Filter
   alias Pleroma.Notification
   alias Pleroma.Object
   alias Pleroma.Repo
+  alias Pleroma.ScheduledActivity
   alias Pleroma.Stats
   alias Pleroma.User
   alias Pleroma.Web
   alias Pleroma.Web.ActivityPub.ActivityPub
-  alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.ActivityPub.Visibility
   alias Pleroma.Web.CommonAPI
   alias Pleroma.Web.MastodonAPI.AccountView
+  alias Pleroma.Web.MastodonAPI.AppView
+  alias Pleroma.Web.MastodonAPI.ConversationView
   alias Pleroma.Web.MastodonAPI.FilterView
   alias Pleroma.Web.MastodonAPI.ListView
   alias Pleroma.Web.MastodonAPI.MastodonAPI
   alias Pleroma.Web.MastodonAPI.MastodonView
+  alias Pleroma.Web.MastodonAPI.NotificationView
   alias Pleroma.Web.MastodonAPI.ReportView
+  alias Pleroma.Web.MastodonAPI.ScheduledActivityView
   alias Pleroma.Web.MastodonAPI.StatusView
   alias Pleroma.Web.MediaProxy
   alias Pleroma.Web.OAuth.App
@@ -51,16 +57,9 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     with cs <- App.register_changeset(%App{}, app_attrs),
          false <- cs.changes[:client_name] == @local_mastodon_name,
          {:ok, app} <- Repo.insert(cs) do
-      res = %{
-        id: app.id |> to_string,
-        name: app.client_name,
-        client_id: app.client_id,
-        client_secret: app.client_secret,
-        redirect_uri: app.redirect_uris,
-        website: app.website
-      }
-
-      json(conn, res)
+      conn
+      |> put_view(AppView)
+      |> render("show.json", %{app: app})
     end
   end
 
@@ -132,6 +131,14 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     json(conn, account)
   end
 
+  def verify_app_credentials(%{assigns: %{user: _user, token: token}} = conn, _) do
+    with %Token{app: %App{} = app} <- Repo.preload(token, :app) do
+      conn
+      |> put_view(AppView)
+      |> render("short.json", %{app: app})
+    end
+  end
+
   def user(%{assigns: %{user: for_user}} = conn, %{"id" => nickname_or_id}) do
     with %User{} = user <- User.get_cached_by_nickname_or_id(nickname_or_id),
          true <- User.auth_active?(user) || user.id == for_user.id || User.superuser?(for_user) do
@@ -161,6 +168,9 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
       },
       stats: Stats.get_stats(),
       thumbnail: Web.base_url() <> "/instance/thumbnail.jpeg",
+      languages: ["en"],
+      registrations: Pleroma.Config.get([:instance, :registrations_open]),
+      # Extra (not present in Mastodon):
       max_toot_chars: Keyword.get(instance, :limit)
     }
 
@@ -173,14 +183,15 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
 
   defp mastodonized_emoji do
     Pleroma.Emoji.get_all()
-    |> Enum.map(fn {shortcode, relative_url} ->
+    |> Enum.map(fn {shortcode, relative_url, tags} ->
       url = to_string(URI.merge(Web.base_url(), relative_url))
 
       %{
         "shortcode" => shortcode,
         "static_url" => url,
         "visible_in_picker" => true,
-        "url" => url
+        "url" => url,
+        "tags" => String.split(tags, ",")
       }
     end)
   end
@@ -280,7 +291,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def user_statuses(%{assigns: %{user: reading_user}} = conn, params) do
-    with %User{} = user <- Repo.get(User, params["id"]) do
+    with %User{} = user <- User.get_by_id(params["id"]) do
       activities = ActivityPub.fetch_user_activities(user, reading_user, params)
 
       conn
@@ -314,7 +325,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def get_status(%{assigns: %{user: user}} = conn, %{"id" => id}) do
-    with %Activity{} = activity <- Repo.get(Activity, id),
+    with %Activity{} = activity <- Activity.get_by_id(id),
          true <- Visibility.visible_for_user?(activity, user) do
       conn
       |> put_view(StatusView)
@@ -323,7 +334,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def get_context(%{assigns: %{user: user}} = conn, %{"id" => id}) do
-    with %Activity{} = activity <- Repo.get(Activity, id),
+    with %Activity{} = activity <- Activity.get_by_id(id),
          activities <-
            ActivityPub.fetch_activities_for_context(activity.data["context"], %{
              "blocking_user" => user,
@@ -359,6 +370,55 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     end
   end
 
+  def scheduled_statuses(%{assigns: %{user: user}} = conn, params) do
+    with scheduled_activities <- MastodonAPI.get_scheduled_activities(user, params) do
+      conn
+      |> add_link_headers(:scheduled_statuses, scheduled_activities)
+      |> put_view(ScheduledActivityView)
+      |> render("index.json", %{scheduled_activities: scheduled_activities})
+    end
+  end
+
+  def show_scheduled_status(%{assigns: %{user: user}} = conn, %{"id" => scheduled_activity_id}) do
+    with %ScheduledActivity{} = scheduled_activity <-
+           ScheduledActivity.get(user, scheduled_activity_id) do
+      conn
+      |> put_view(ScheduledActivityView)
+      |> render("show.json", %{scheduled_activity: scheduled_activity})
+    else
+      _ -> {:error, :not_found}
+    end
+  end
+
+  def update_scheduled_status(
+        %{assigns: %{user: user}} = conn,
+        %{"id" => scheduled_activity_id} = params
+      ) do
+    with %ScheduledActivity{} = scheduled_activity <-
+           ScheduledActivity.get(user, scheduled_activity_id),
+         {:ok, scheduled_activity} <- ScheduledActivity.update(scheduled_activity, params) do
+      conn
+      |> put_view(ScheduledActivityView)
+      |> render("show.json", %{scheduled_activity: scheduled_activity})
+    else
+      nil -> {:error, :not_found}
+      error -> error
+    end
+  end
+
+  def delete_scheduled_status(%{assigns: %{user: user}} = conn, %{"id" => scheduled_activity_id}) do
+    with %ScheduledActivity{} = scheduled_activity <-
+           ScheduledActivity.get(user, scheduled_activity_id),
+         {:ok, scheduled_activity} <- ScheduledActivity.delete(scheduled_activity) do
+      conn
+      |> put_view(ScheduledActivityView)
+      |> render("show.json", %{scheduled_activity: scheduled_activity})
+    else
+      nil -> {:error, :not_found}
+      error -> error
+    end
+  end
+
   def post_status(conn, %{"status" => "", "media_ids" => media_ids} = params)
       when length(media_ids) > 0 do
     params =
@@ -379,12 +439,27 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
         _ -> Ecto.UUID.generate()
       end
 
-    {:ok, activity} =
-      Cachex.fetch!(:idempotency_cache, idempotency_key, fn _ -> CommonAPI.post(user, params) end)
+    scheduled_at = params["scheduled_at"]
 
-    conn
-    |> put_view(StatusView)
-    |> try_render("status.json", %{activity: activity, for: user, as: :activity})
+    if scheduled_at && ScheduledActivity.far_enough?(scheduled_at) do
+      with {:ok, scheduled_activity} <-
+             ScheduledActivity.create(user, %{"params" => params, "scheduled_at" => scheduled_at}) do
+        conn
+        |> put_view(ScheduledActivityView)
+        |> render("show.json", %{scheduled_activity: scheduled_activity})
+      end
+    else
+      params = Map.drop(params, ["scheduled_at"])
+
+      {:ok, activity} =
+        Cachex.fetch!(:idempotency_cache, idempotency_key, fn _ ->
+          CommonAPI.post(user, params)
+        end)
+
+      conn
+      |> put_view(StatusView)
+      |> try_render("status.json", %{activity: activity, for: user, as: :activity})
+    end
   end
 
   def delete_status(%{assigns: %{user: user}} = conn, %{"id" => id}) do
@@ -455,7 +530,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def bookmark_status(%{assigns: %{user: user}} = conn, %{"id" => id}) do
-    with %Activity{} = activity <- Repo.get(Activity, id),
+    with %Activity{} = activity <- Activity.get_by_id(id),
          %User{} = user <- User.get_by_nickname(user.nickname),
          true <- Visibility.visible_for_user?(activity, user),
          {:ok, user} <- User.bookmark(user, activity.data["object"]["id"]) do
@@ -466,7 +541,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def unbookmark_status(%{assigns: %{user: user}} = conn, %{"id" => id}) do
-    with %Activity{} = activity <- Repo.get(Activity, id),
+    with %Activity{} = activity <- Activity.get_by_id(id),
          %User{} = user <- User.get_by_nickname(user.nickname),
          true <- Visibility.visible_for_user?(activity, user),
          {:ok, user} <- User.unbookmark(user, activity.data["object"]["id"]) do
@@ -502,21 +577,19 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def notifications(%{assigns: %{user: user}} = conn, params) do
-    notifications = Notification.for_user(user, params)
-
-    result =
-      notifications
-      |> Enum.map(fn x -> render_notification(user, x) end)
-      |> Enum.filter(& &1)
+    notifications = MastodonAPI.get_notifications(user, params)
 
     conn
     |> add_link_headers(:notifications, notifications)
-    |> json(result)
+    |> put_view(NotificationView)
+    |> render("index.json", %{notifications: notifications, for: user})
   end
 
   def get_notification(%{assigns: %{user: user}} = conn, %{"id" => id} = _params) do
     with {:ok, notification} <- Notification.get(user, id) do
-      json(conn, render_notification(user, notification))
+      conn
+      |> put_view(NotificationView)
+      |> render("show.json", %{notification: notification, for: user})
     else
       {:error, reason} ->
         conn
@@ -590,7 +663,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def favourited_by(conn, %{"id" => id}) do
-    with %Activity{data: %{"object" => %{"likes" => likes}}} <- Repo.get(Activity, id) do
+    with %Activity{data: %{"object" => %{"likes" => likes}}} <- Activity.get_by_id(id) do
       q = from(u in User, where: u.ap_id in ^likes)
       users = Repo.all(q)
 
@@ -603,7 +676,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def reblogged_by(conn, %{"id" => id}) do
-    with %Activity{data: %{"object" => %{"announcements" => announces}}} <- Repo.get(Activity, id) do
+    with %Activity{data: %{"object" => %{"announcements" => announces}}} <- Activity.get_by_id(id) do
       q = from(u in User, where: u.ap_id in ^announces)
       users = Repo.all(q)
 
@@ -654,7 +727,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def followers(%{assigns: %{user: for_user}} = conn, %{"id" => id} = params) do
-    with %User{} = user <- Repo.get(User, id),
+    with %User{} = user <- User.get_by_id(id),
          followers <- MastodonAPI.get_followers(user, params) do
       followers =
         cond do
@@ -671,7 +744,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def following(%{assigns: %{user: for_user}} = conn, %{"id" => id} = params) do
-    with %User{} = user <- Repo.get(User, id),
+    with %User{} = user <- User.get_by_id(id),
          followers <- MastodonAPI.get_friends(user, params) do
       followers =
         cond do
@@ -696,17 +769,8 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def authorize_follow_request(%{assigns: %{user: followed}} = conn, %{"id" => id}) do
-    with %User{} = follower <- Repo.get(User, id),
-         {:ok, follower} <- User.maybe_follow(follower, followed),
-         %Activity{} = follow_activity <- Utils.fetch_latest_follow(follower, followed),
-         {:ok, follow_activity} <- Utils.update_follow_state(follow_activity, "accept"),
-         {:ok, _activity} <-
-           ActivityPub.accept(%{
-             to: [follower.ap_id],
-             actor: followed,
-             object: follow_activity.data["id"],
-             type: "Accept"
-           }) do
+    with %User{} = follower <- User.get_by_id(id),
+         {:ok, follower} <- CommonAPI.accept_follow_request(follower, followed) do
       conn
       |> put_view(AccountView)
       |> render("relationship.json", %{user: followed, target: follower})
@@ -719,16 +783,8 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def reject_follow_request(%{assigns: %{user: followed}} = conn, %{"id" => id}) do
-    with %User{} = follower <- Repo.get(User, id),
-         %Activity{} = follow_activity <- Utils.fetch_latest_follow(follower, followed),
-         {:ok, follow_activity} <- Utils.update_follow_state(follow_activity, "reject"),
-         {:ok, _activity} <-
-           ActivityPub.reject(%{
-             to: [follower.ap_id],
-             actor: followed,
-             object: follow_activity.data["id"],
-             type: "Reject"
-           }) do
+    with %User{} = follower <- User.get_by_id(id),
+         {:ok, follower} <- CommonAPI.reject_follow_request(follower, followed) do
       conn
       |> put_view(AccountView)
       |> render("relationship.json", %{user: followed, target: follower})
@@ -741,12 +797,26 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def follow(%{assigns: %{user: follower}} = conn, %{"id" => id}) do
-    with %User{} = followed <- Repo.get(User, id),
+    with %User{} = followed <- User.get_by_id(id),
+         false <- User.following?(follower, followed),
          {:ok, follower, followed, _} <- CommonAPI.follow(follower, followed) do
       conn
       |> put_view(AccountView)
       |> render("relationship.json", %{user: follower, target: followed})
     else
+      true ->
+        followed = User.get_cached_by_id(id)
+
+        {:ok, follower} =
+          case conn.params["reblogs"] do
+            true -> CommonAPI.show_reblogs(follower, followed)
+            false -> CommonAPI.hide_reblogs(follower, followed)
+          end
+
+        conn
+        |> put_view(AccountView)
+        |> render("relationship.json", %{user: follower, target: followed})
+
       {:error, message} ->
         conn
         |> put_resp_content_type("application/json")
@@ -755,7 +825,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def follow(%{assigns: %{user: follower}} = conn, %{"uri" => uri}) do
-    with %User{} = followed <- Repo.get_by(User, nickname: uri),
+    with %User{} = followed <- User.get_by_nickname(uri),
          {:ok, follower, followed, _} <- CommonAPI.follow(follower, followed) do
       conn
       |> put_view(AccountView)
@@ -769,9 +839,8 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def unfollow(%{assigns: %{user: follower}} = conn, %{"id" => id}) do
-    with %User{} = followed <- Repo.get(User, id),
-         {:ok, _activity} <- ActivityPub.unfollow(follower, followed),
-         {:ok, follower, _} <- User.unfollow(follower, followed) do
+    with %User{} = followed <- User.get_by_id(id),
+         {:ok, follower} <- CommonAPI.unfollow(follower, followed) do
       conn
       |> put_view(AccountView)
       |> render("relationship.json", %{user: follower, target: followed})
@@ -779,7 +848,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def mute(%{assigns: %{user: muter}} = conn, %{"id" => id}) do
-    with %User{} = muted <- Repo.get(User, id),
+    with %User{} = muted <- User.get_by_id(id),
          {:ok, muter} <- User.mute(muter, muted) do
       conn
       |> put_view(AccountView)
@@ -793,7 +862,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def unmute(%{assigns: %{user: muter}} = conn, %{"id" => id}) do
-    with %User{} = muted <- Repo.get(User, id),
+    with %User{} = muted <- User.get_by_id(id),
          {:ok, muter} <- User.unmute(muter, muted) do
       conn
       |> put_view(AccountView)
@@ -814,7 +883,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def block(%{assigns: %{user: blocker}} = conn, %{"id" => id}) do
-    with %User{} = blocked <- Repo.get(User, id),
+    with %User{} = blocked <- User.get_by_id(id),
          {:ok, blocker} <- User.block(blocker, blocked),
          {:ok, _activity} <- ActivityPub.block(blocker, blocked) do
       conn
@@ -829,7 +898,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def unblock(%{assigns: %{user: blocker}} = conn, %{"id" => id}) do
-    with %User{} = blocked <- Repo.get(User, id),
+    with %User{} = blocked <- User.get_by_id(id),
          {:ok, blocker} <- User.unblock(blocker, blocked),
          {:ok, _activity} <- ActivityPub.unblock(blocker, blocked) do
       conn
@@ -950,12 +1019,14 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def favourites(%{assigns: %{user: user}} = conn, params) do
-    activities =
+    params =
       params
       |> Map.put("type", "Create")
       |> Map.put("favorited_by", user.ap_id)
       |> Map.put("blocking_user", user)
-      |> ActivityPub.fetch_public_activities()
+
+    activities =
+      ActivityPub.fetch_activities([], params)
       |> Enum.reverse()
 
     conn
@@ -965,7 +1036,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def bookmarks(%{assigns: %{user: user}} = conn, _) do
-    user = Repo.get(User, user.id)
+    user = User.get_by_id(user.id)
 
     activities =
       user.bookmarks
@@ -1022,7 +1093,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     accounts
     |> Enum.each(fn account_id ->
       with %Pleroma.List{} = list <- Pleroma.List.get(id, user),
-           %User{} = followed <- Repo.get(User, account_id) do
+           %User{} = followed <- User.get_by_id(account_id) do
         Pleroma.List.follow(list, followed)
       end
     end)
@@ -1034,7 +1105,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     accounts
     |> Enum.each(fn account_id ->
       with %Pleroma.List{} = list <- Pleroma.List.get(id, user),
-           %User{} = followed <- Repo.get(Pleroma.User, account_id) do
+           %User{} = followed <- Pleroma.User.get_by_id(account_id) do
         Pleroma.List.unfollow(list, followed)
       end
     end)
@@ -1090,9 +1161,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def index(%{assigns: %{user: user}} = conn, _params) do
-    token =
-      conn
-      |> get_session(:oauth_token)
+    token = get_session(conn, :oauth_token)
 
     if user && token do
       mastodon_emoji = mastodonized_emoji()
@@ -1120,7 +1189,8 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
             auto_play_gif: false,
             display_sensitive_media: false,
             reduce_motion: false,
-            max_toot_chars: limit
+            max_toot_chars: limit,
+            mascot: "/images/pleroma-fox-tan-smol.png"
           },
           rights: %{
             delete_others_notice: present?(user.info.is_moderator),
@@ -1129,7 +1199,8 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
           compose: %{
             me: "#{user.id}",
             default_privacy: user.info.default_scope,
-            default_sensitive: false
+            default_sensitive: false,
+            allow_content_types: Config.get([:instance, :allowed_post_formats])
           },
           media_attachments: %{
             accept_content_types: [
@@ -1191,6 +1262,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
       |> render("index.html", %{initial_state: initial_state, flavour: flavour})
     else
       conn
+      |> put_session(:return_to, conn.request_path)
       |> redirect(to: "/web/login")
     end
   end
@@ -1247,16 +1319,22 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     "glitch"
   end
 
-  def login(conn, %{"code" => code}) do
+  def login(%{assigns: %{user: %User{}}} = conn, _params) do
+    redirect(conn, to: local_mastodon_root_path(conn))
+  end
+
+  @doc "Local Mastodon FE login init action"
+  def login(conn, %{"code" => auth_token}) do
     with {:ok, app} <- get_or_make_app(),
-         %Authorization{} = auth <- Repo.get_by(Authorization, token: code, app_id: app.id),
+         %Authorization{} = auth <- Repo.get_by(Authorization, token: auth_token, app_id: app.id),
          {:ok, token} <- Token.exchange_token(app, auth) do
       conn
       |> put_session(:oauth_token, token.token)
-      |> redirect(to: "/web/getting-started")
+      |> redirect(to: local_mastodon_root_path(conn))
     end
   end
 
+  @doc "Local Mastodon FE callback action"
   def login(conn, _) do
     with {:ok, app} <- get_or_make_app() do
       path =
@@ -1269,8 +1347,18 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
           scope: Enum.join(app.scopes, " ")
         )
 
-      conn
-      |> redirect(to: path)
+      redirect(conn, to: path)
+    end
+  end
+
+  defp local_mastodon_root_path(conn) do
+    case get_session(conn, :return_to) do
+      nil ->
+        mastodon_api_path(conn, :index, ["getting-started"])
+
+      return_to ->
+        delete_session(conn, :return_to)
+        return_to
     end
   end
 
@@ -1310,7 +1398,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   def relationship_noop(%{assigns: %{user: user}} = conn, %{"id" => id}) do
     Logger.debug("Unimplemented, returning unmodified relationship")
 
-    with %User{} = target <- Repo.get(User, id) do
+    with %User{} = target <- User.get_by_id(id) do
       conn
       |> put_view(AccountView)
       |> render("relationship.json", %{user: user, target: target})
@@ -1327,45 +1415,6 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     json(conn, %{})
   end
 
-  def render_notification(user, %{id: id, activity: activity, inserted_at: created_at} = _params) do
-    actor = User.get_cached_by_ap_id(activity.data["actor"])
-    parent_activity = Activity.get_create_by_object_ap_id(activity.data["object"])
-    mastodon_type = Activity.mastodon_notification_type(activity)
-
-    response = %{
-      id: to_string(id),
-      type: mastodon_type,
-      created_at: CommonAPI.Utils.to_masto_date(created_at),
-      account: AccountView.render("account.json", %{user: actor, for: user})
-    }
-
-    case mastodon_type do
-      "mention" ->
-        response
-        |> Map.merge(%{
-          status: StatusView.render("status.json", %{activity: activity, for: user})
-        })
-
-      "favourite" ->
-        response
-        |> Map.merge(%{
-          status: StatusView.render("status.json", %{activity: parent_activity, for: user})
-        })
-
-      "reblog" ->
-        response
-        |> Map.merge(%{
-          status: StatusView.render("status.json", %{activity: parent_activity, for: user})
-        })
-
-      "follow" ->
-        response
-
-      _ ->
-        nil
-    end
-  end
-
   def get_filters(%{assigns: %{user: user}} = conn, _) do
     filters = Filter.get_filters(user)
     res = FilterView.render("filters.json", filters: filters)
@@ -1427,6 +1476,23 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
 
   # fallback action
   #
+  def errors(conn, {:error, %Changeset{} = changeset}) do
+    error_message =
+      changeset
+      |> Changeset.traverse_errors(fn {message, _opt} -> message end)
+      |> Enum.map_join(", ", fn {_k, v} -> v end)
+
+    conn
+    |> put_status(422)
+    |> json(%{error: error_message})
+  end
+
+  def errors(conn, {:error, :not_found}) do
+    conn
+    |> put_status(404)
+    |> json(%{error: "Record not found"})
+  end
+
   def errors(conn, _) do
     conn
     |> put_status(500)
@@ -1491,7 +1557,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def status_card(%{assigns: %{user: user}} = conn, %{"id" => status_id}) do
-    with %Activity{} = activity <- Repo.get(Activity, status_id),
+    with %Activity{} = activity <- Activity.get_by_id(status_id),
          true <- Visibility.visible_for_user?(activity, user) do
       data =
         StatusView.render(
@@ -1520,6 +1586,31 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     end
   end
 
+  def conversations(%{assigns: %{user: user}} = conn, params) do
+    participations = Participation.for_user_with_last_activity_id(user, params)
+
+    conversations =
+      Enum.map(participations, fn participation ->
+        ConversationView.render("participation.json", %{participation: participation, user: user})
+      end)
+
+    conn
+    |> add_link_headers(:conversations, participations)
+    |> json(conversations)
+  end
+
+  def conversation_read(%{assigns: %{user: user}} = conn, %{"id" => participation_id}) do
+    with %Participation{} = participation <-
+           Repo.get_by(Participation, id: participation_id, user_id: user.id),
+         {:ok, participation} <- Participation.mark_as_read(participation) do
+      participation_view =
+        ConversationView.render("participation.json", %{participation: participation, user: user})
+
+      conn
+      |> json(participation_view)
+    end
+  end
+
   def try_render(conn, target, params)
       when is_binary(target) do
     res = render(conn, target, params)