Merge branch 'show-media-endpoint-fixes' into 'develop'

MediaController OAuth scope assignments fix

See merge request pleroma/pleroma!2541

lib/pleroma/object.ex

@@ -138,12 +138,17 @@ def normalize(ap_id, true, options) when is_binary(ap_id) do
 
   def normalize(_, _, _), do: nil
 
-  # Owned objects can only be mutated by their owner
-  def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}),
-    do: actor == ap_id
+  # Owned objects can only be accessed by their owner
+  def authorize_access(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}) do
+    if actor == ap_id do
+      :ok
+    else
+      {:error, :forbidden}
+    end
+  end
 
-  # Legacy objects can be mutated by anybody
-  def authorize_mutation(%Object{}, %User{}), do: true
+  # Legacy objects can be accessed by anybody
+  def authorize_access(%Object{}, %User{}), do: :ok
 
   @spec get_cached_by_ap_id(String.t()) :: Object.t() | nil
   def get_cached_by_ap_id(ap_id) do

lib/pleroma/web/mastodon_api/controllers/fallback_controller.ex

@@ -20,6 +20,10 @@ def call(conn, {:error, :not_found}) do
     render_error(conn, :not_found, "Record not found")
   end
 
+  def call(conn, {:error, :forbidden}) do
+    render_error(conn, :forbidden, "Access denied")
+  end
+
   def call(conn, {:error, error_message}) do
     conn
     |> put_status(:bad_request)

lib/pleroma/web/mastodon_api/controllers/media_controller.ex

@@ -14,7 +14,8 @@ defmodule Pleroma.Web.MastodonAPI.MediaController do
   plug(Pleroma.Web.ApiSpec.CastAndValidate)
   plug(:put_view, Pleroma.Web.MastodonAPI.StatusView)
 
-  plug(OAuthScopesPlug, %{scopes: ["write:media"]})
+  plug(OAuthScopesPlug, %{scopes: ["read:media"]} when action == :show)
+  plug(OAuthScopesPlug, %{scopes: ["write:media"]} when action != :show)
 
   defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.MediaOperation
 
@@ -55,7 +56,7 @@ def create2(_conn, _data), do: {:error, :bad_request}
   @doc "PUT /api/v1/media/:id"
   def update(%{assigns: %{user: user}, body_params: %{description: description}} = conn, %{id: id}) do
     with %Object{} = object <- Object.get_by_id(id),
-         true <- Object.authorize_mutation(object, user),
+         :ok <- Object.authorize_access(object, user),
          {:ok, %Object{data: data}} <- Object.update_data(object, %{"name" => description}) do
       attachment_data = Map.put(data, "id", object.id)
 
@@ -66,13 +67,14 @@ def update(%{assigns: %{user: user}, body_params: %{description: description}} =
   def update(conn, data), do: show(conn, data)
 
   @doc "GET /api/v1/media/:id"
-  def show(conn, %{id: id}) do
-    with %Object{data: data, id: object_id} <- Object.get_by_id(id) do
+  def show(%{assigns: %{user: user}} = conn, %{id: id}) do
+    with %Object{data: data, id: object_id} = object <- Object.get_by_id(id),
+         :ok <- Object.authorize_access(object, user) do
       attachment_data = Map.put(data, "id", object_id)
 
       render(conn, "attachment.json", %{attachment: attachment_data})
     end
   end
 
-  def get_media(_conn, _data), do: {:error, :bad_request}
+  def show(_conn, _data), do: {:error, :bad_request}
 end

test/web/mastodon_api/controllers/media_controller_test.exs

@@ -9,9 +9,9 @@ defmodule Pleroma.Web.MastodonAPI.MediaControllerTest do
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
 
-  setup do: oauth_access(["write:media"])
-
   describe "Upload media" do
+    setup do: oauth_access(["write:media"])
+
     setup do
       image = %Plug.Upload{
         content_type: "image/jpg",
@@ -42,7 +42,7 @@ test "/api/v1/media", %{conn: conn, image: image} do
       assert object.data["actor"] == User.ap_id(conn.assigns[:user])
     end
 
-    test "/api/v2/media", %{conn: conn, image: image} do
+    test "/api/v2/media", %{conn: conn, user: user, image: image} do
       desc = "Description of the image"
 
       response =
@@ -53,6 +53,8 @@ test "/api/v2/media", %{conn: conn, image: image} do
 
       assert media_id = response["id"]
 
+      %{conn: conn} = oauth_access(["read:media"], user: user)
+
       media =
         conn
         |> get("/api/v1/media/#{media_id}")
@@ -61,12 +63,15 @@ test "/api/v2/media", %{conn: conn, image: image} do
       assert media["type"] == "image"
       assert media["description"] == desc
       assert media["id"]
+
       object = Object.get_by_id(media["id"])
-      assert object.data["actor"] == User.ap_id(conn.assigns[:user])
+      assert object.data["actor"] == user.ap_id
     end
   end
 
   describe "Update media description" do
+    setup do: oauth_access(["write:media"])
+
     setup %{user: actor} do
       file = %Plug.Upload{
         content_type: "image/jpg",
@@ -96,7 +101,9 @@ test "/api/v1/media/:id good request", %{conn: conn, object: object} do
     end
   end
 
-  describe "Get media by id" do
+  describe "Get media by id (/api/v1/media/:id)" do
+    setup do: oauth_access(["read:media"])
+
     setup %{user: actor} do
       file = %Plug.Upload{
         content_type: "image/jpg",
@@ -114,7 +121,7 @@ test "/api/v1/media/:id good request", %{conn: conn, object: object} do
       [object: object]
     end
 
-    test "/api/v1/media/:id", %{conn: conn, object: object} do
+    test "it returns media object when requested by owner", %{conn: conn, object: object} do
       media =
         conn
         |> get("/api/v1/media/#{object.id}")
@@ -124,5 +131,16 @@ test "/api/v1/media/:id", %{conn: conn, object: object} do
       assert media["type"] == "image"
       assert media["id"]
     end
+
+    test "it returns 403 if media object requested by non-owner", %{object: object, user: user} do
+      %{conn: conn, user: other_user} = oauth_access(["read:media"])
+
+      assert object.data["actor"] == user.ap_id
+      refute user.id == other_user.id
+
+      conn
+      |> get("/api/v1/media/#{object.id}")
+      |> json_response(403)
+    end
   end
 end