Merge branch 'support/oauth_fetch_token' into 'develop'

[#273] bugfix/273

See merge request pleroma/pleroma!502

lib/pleroma/plugs/oauth_plug.ex

@@ -1,30 +1,68 @@
 defmodule Pleroma.Plugs.OAuthPlug do
   import Plug.Conn
-  alias Pleroma.User
-  alias Pleroma.Repo
-  alias Pleroma.Web.OAuth.Token
+  import Ecto.Query
 
-  def init(options) do
-    options
-  end
+  alias Pleroma.{
+    User,
+    Repo,
+    Web.OAuth.Token
+  }
+
+  @realm_reg Regex.compile!("Bearer\:?\s+(.*)$", "i")
+
+  def init(options), do: options
 
   def call(%{assigns: %{user: %User{}}} = conn, _), do: conn
 
   def call(conn, _) do
-    token =
-      case get_req_header(conn, "authorization") do
-        ["Bearer " <> header] -> header
-        _ -> get_session(conn, :oauth_token)
-      end
-
-    with token when not is_nil(token) <- token,
-         %Token{user_id: user_id} <- Repo.get_by(Token, token: token),
-         %User{} = user <- Repo.get(User, user_id),
-         false <- !!user.info.deactivated do
-      conn
-      |> assign(:user, user)
+    with {:ok, token} <- fetch_token(conn),
+         {:ok, user} <- fetch_user(token) do
+      assign(conn, :user, user)
     else
       _ -> conn
     end
   end
+
+  # Gets user by token
+  #
+  @spec fetch_user(String.t()) :: {:ok, User.t()} | nil
+  defp fetch_user(token) do
+    query = from(q in Token, where: q.token == ^token, preload: [:user])
+
+    with %Token{user: %{info: %{deactivated: false} = _} = user} <- Repo.one(query) do
+      {:ok, user}
+    end
+  end
+
+  # Gets token from session by :oauth_token key
+  #
+  @spec fetch_token_from_session(Plug.Conn.t()) :: :no_token_found | {:ok, String.t()}
+  defp fetch_token_from_session(conn) do
+    case get_session(conn, :oauth_token) do
+      nil -> :no_token_found
+      token -> {:ok, token}
+    end
+  end
+
+  # Gets token from headers
+  #
+  @spec fetch_token(Plug.Conn.t()) :: :no_token_found | {:ok, String.t()}
+  defp fetch_token(%Plug.Conn{} = conn) do
+    headers = get_req_header(conn, "authorization")
+
+    with :no_token_found <- fetch_token(headers),
+         do: fetch_token_from_session(conn)
+  end
+
+  @spec fetch_token(Keyword.t()) :: :no_token_found | {:ok, String.t()}
+  defp fetch_token([]), do: :no_token_found
+
+  defp fetch_token([token | tail]) do
+    trimmed_token = String.trim(token)
+
+    case Regex.run(@realm_reg, trimmed_token) do
+      [_, match] -> {:ok, String.trim(match)}
+      _ -> fetch_token(tail)
+    end
+  end
 end