From e17c71a38963cfed2fbcff4872a2a44be028f4eb Mon Sep 17 00:00:00 2001
From: Atsuko Karagi <atsuko.karagi@localhost>
Date: Mon, 19 Dec 2022 20:32:16 +0000
Subject: [PATCH] Respect restrict_unauthenticated in /api/v1/accounts/lookup

---
 CHANGELOG.md                                  |  3 ++
 .../api_spec/operations/account_operation.ex  |  1 +
 .../controllers/account_controller.ex         |  9 ++--
 .../controllers/account_controller_test.exs   | 44 +++++++++++++++++++
 4 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3930a25ec..73346617e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - Admin scopes will be dropped on create
 - Rich media will now backoff for 20 minutes after a failure
 
+### Fixed 
+- /api/v1/accounts/lookup will now respect restrict\_unauthenticated
+
 ### Upgrade notes
 - Ensure `config :tesla, :adapter` is either unset, or set to `{Tesla.Adapter.Finch, name: MyFinch}` in your .exs config
 - Pleroma-FE will need to be updated to handle the new /api/v1/pleroma endpoints for  custom emoji
diff --git a/lib/pleroma/web/api_spec/operations/account_operation.ex b/lib/pleroma/web/api_spec/operations/account_operation.ex
index a89f9570e..894ad5db0 100644
--- a/lib/pleroma/web/api_spec/operations/account_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/account_operation.ex
@@ -432,6 +432,7 @@ def lookup_operation do
       ],
       responses: %{
         200 => Operation.response("Account", "application/json", Account),
+        401 => Operation.response("Error", "application/json", ApiError),
         404 => Operation.response("Error", "application/json", ApiError)
       }
     }
diff --git a/lib/pleroma/web/mastodon_api/controllers/account_controller.ex b/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
index 5afbcd0dd..678ec3a80 100644
--- a/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
@@ -32,14 +32,14 @@ defmodule Pleroma.Web.MastodonAPI.AccountController do
 
   plug(Pleroma.Web.ApiSpec.CastAndValidate)
 
-  plug(:skip_auth when action in [:create, :lookup])
+  plug(:skip_auth when action in [:create])
 
   plug(:skip_public_check when action in [:show, :statuses])
 
   plug(
     OAuthScopesPlug,
     %{fallback: :proceed_unauthenticated, scopes: ["read:accounts"]}
-    when action in [:show, :followers, :following]
+    when action in [:show, :followers, :following, :lookup]
   )
 
   plug(
@@ -521,8 +521,9 @@ def blocks(%{assigns: %{user: user}} = conn, params) do
   end
 
   @doc "GET /api/v1/accounts/lookup"
-  def lookup(conn, %{acct: nickname} = _params) do
-    with %User{} = user <- User.get_by_nickname(nickname) do
+  def lookup(%{assigns: %{user: for_user}} = conn, %{acct: nickname} = _params) do
+    with %User{} = user <- User.get_by_nickname(nickname),
+         :visible <- User.visible_for(user, for_user) do
       render(conn, "show.json",
         user: user,
         skip_visibility_check: true
diff --git a/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
index 29e34546e..bbede76e9 100644
--- a/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
@@ -1919,6 +1919,50 @@ test "account lookup", %{conn: conn} do
       |> json_response_and_validate_schema(404)
   end
 
+  test "account lookup with restrict unauthenticated profiles for local" do
+    clear_config([:restrict_unauthenticated, :profiles, :local], true)
+
+    user = insert(:user, local: true)
+    reading_user = insert(:user)
+
+    conn =
+      build_conn()
+      |> get("/api/v1/accounts/lookup?acct=#{user.nickname}")
+
+    assert json_response_and_validate_schema(conn, 401)
+
+    conn =
+      build_conn()
+      |> assign(:user, reading_user)
+      |> assign(:token, insert(:oauth_token, user: reading_user, scopes: ["read:accounts"]))
+      |> get("/api/v1/accounts/lookup?acct=#{user.nickname}")
+
+    assert %{"id" => id} = json_response_and_validate_schema(conn, 200)
+    assert id == user.id
+  end
+
+  test "account lookup with restrict unauthenticated profiles for remote" do
+    clear_config([:restrict_unauthenticated, :profiles, :remote], true)
+
+    user = insert(:user, nickname: "user@example.com", local: false)
+    reading_user = insert(:user)
+
+    conn =
+      build_conn()
+      |> get("/api/v1/accounts/lookup?acct=#{user.nickname}")
+
+    assert json_response_and_validate_schema(conn, 401)
+
+    conn =
+      build_conn()
+      |> assign(:user, reading_user)
+      |> assign(:token, insert(:oauth_token, user: reading_user, scopes: ["read:accounts"]))
+      |> get("/api/v1/accounts/lookup?acct=#{user.nickname}")
+
+    assert %{"id" => id} = json_response_and_validate_schema(conn, 200)
+    assert id == user.id
+  end
+
   test "create a note on a user" do
     %{conn: conn} = oauth_access(["write:accounts", "read:follows"])
     other_user = insert(:user)