Merge branch 'develop' into feature/bulk-confirmation

[akkoma] / lib / pleroma / plugs / oauth_scopes_plug.ex

diff --git a/lib/pleroma/plugs/oauth_scopes_plug.ex b/lib/pleroma/plugs/oauth_scopes_plug.ex
index b508628a92dca12b90e197c1acf3a3ca3c66b4bc..b1a736d78ad2cf02727dd049769bc9937ae3f5c1 100644 (file)
--- a/lib/pleroma/plugs/oauth_scopes_plug.ex
+++ b/lib/pleroma/plugs/oauth_scopes_plug.ex
@@ -1,36 +1,37 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Plugs.OAuthScopesPlug do
   import Plug.Conn
   import Pleroma.Web.Gettext
 
-  @behaviour Plug
+  alias Pleroma.Config
+
+  use Pleroma.Web, :plug
 
   def init(%{scopes: _} = options), do: options
 
-  def call(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
+  @impl true
+  def perform(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
     op = options[:op] || :|
     token = assigns[:token]
 
-    cond do
-      is_nil(token) ->
-        conn
+    scopes = transform_scopes(scopes, options)
+    matched_scopes = (token && filter_descendants(scopes, token.scopes)) || []
 
-      op == :| && scopes -- token.scopes != scopes ->
+    cond do
+      token && op == :| && Enum.any?(matched_scopes) ->
         conn
 
-      op == :& && scopes -- token.scopes == [] ->
+      token && op == :& && matched_scopes == scopes ->
         conn
 
       options[:fallback] == :proceed_unauthenticated ->
-        conn
-        |> assign(:user, nil)
-        |> assign(:token, nil)
+        drop_auth_info(conn)
 
       true ->
-        missing_scopes = scopes -- token.scopes
+        missing_scopes = scopes -- matched_scopes
         permissions = Enum.join(missing_scopes, " #{op} ")
 
         error_message =
@@ -42,4 +43,35 @@ defmodule Pleroma.Plugs.OAuthScopesPlug do
         |> halt()
     end
   end
+
+  @doc "Drops authentication info from connection"
+  def drop_auth_info(conn) do
+    # To simplify debugging, setting a private variable on `conn` if auth info is dropped
+    conn
+    |> put_private(:authentication_ignored, true)
+    |> assign(:user, nil)
+    |> assign(:token, nil)
+  end
+
+  @doc "Keeps those of `scopes` which are descendants of `supported_scopes`"
+  def filter_descendants(scopes, supported_scopes) do
+    Enum.filter(
+      scopes,
+      fn scope ->
+        Enum.find(
+          supported_scopes,
+          &(scope == &1 || String.starts_with?(scope, &1 <> ":"))
+        )
+      end
+    )
+  end
+
+  @doc "Transforms scopes by applying supported options (e.g. :admin)"
+  def transform_scopes(scopes, options) do
+    if options[:admin] do
+      Config.oauth_admin_scopes(scopes)
+    else
+      scopes
+    end
+  end
 end