Merge branch 'openapi/validation-plug' into 'develop'

Ignore unexpected query params and ENUM values

Closes #1719

See merge request pleroma/pleroma!2468

config/config.exs

@@ -653,6 +653,8 @@ config :pleroma, :restrict_unauthenticated,
   profiles: %{local: false, remote: false},
   activities: %{local: false, remote: false}
 
+config :pleroma, Pleroma.Web.ApiSpec.CastAndValidate, strict: false
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{Mix.env()}.exs"

config/description.exs

@@ -3195,5 +3195,19 @@ config :pleroma, :config_description, [
         ]
       }
     ]
+  },
+  %{
+    group: :pleroma,
+    key: Pleroma.Web.ApiSpec.CastAndValidate,
+    type: :group,
+    children: [
+      %{
+        key: :strict,
+        type: :boolean,
+        description:
+          "Enables strict input validation (useful in development, not recommended in production)",
+        suggestions: [false]
+      }
+    ]
   }
 ]

config/dev.exs

@@ -52,6 +52,8 @@ config :pleroma, Pleroma.Repo,
   hostname: "localhost",
   pool_size: 10
 
+config :pleroma, Pleroma.Web.ApiSpec.CastAndValidate, strict: true
+
 if File.exists?("./config/dev.secret.exs") do
   import_config "dev.secret.exs"
 else

config/test.exs

@@ -96,6 +96,8 @@ config :pleroma, Pleroma.Emails.NewUsersDigestEmail, enabled: true
 
 config :pleroma, Pleroma.Plugs.RemoteIp, enabled: false
 
+config :pleroma, Pleroma.Web.ApiSpec.CastAndValidate, strict: true
+
 if File.exists?("./config/test.secret.exs") do
   import_config "test.secret.exs"
 else

docs/configuration/cheatsheet.md

@@ -924,4 +924,8 @@ Restrict access for unauthenticated users to timelines (public and federate), us
   * `remote`
 * `activities` - statuses
   * `local`
-  * `remote`
+  * `remote`
+
+## Pleroma.Web.ApiSpec.CastAndValidate
+
+* `:strict` a boolean, enables strict input validation (useful in development, not recommended in production). Defaults to `false`.

lib/pleroma/web/api_spec/cast_and_validate.ex

@@ -0,0 +1,139 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2019-2020 Moxley Stratton, Mike Buhot <https://github.com/open-api-spex/open_api_spex>, MPL-2.0
+# Copyright © 2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ApiSpec.CastAndValidate do
+  @moduledoc """
+  This plug is based on [`OpenApiSpex.Plug.CastAndValidate`]
+  (https://github.com/open-api-spex/open_api_spex/blob/master/lib/open_api_spex/plug/cast_and_validate.ex).
+  The main difference is ignoring unexpected query params instead of throwing
+  an error and a config option (`[Pleroma.Web.ApiSpec.CastAndValidate, :strict]`)
+  to disable this behavior. Also, the default rendering error module
+  is `Pleroma.Web.ApiSpec.RenderError`.
+  """
+
+  @behaviour Plug
+
+  alias Plug.Conn
+
+  @impl Plug
+  def init(opts) do
+    opts
+    |> Map.new()
+    |> Map.put_new(:render_error, Pleroma.Web.ApiSpec.RenderError)
+  end
+
+  @impl Plug
+  def call(%{private: %{open_api_spex: private_data}} = conn, %{
+        operation_id: operation_id,
+        render_error: render_error
+      }) do
+    spec = private_data.spec
+    operation = private_data.operation_lookup[operation_id]
+
+    content_type =
+      case Conn.get_req_header(conn, "content-type") do
+        [header_value | _] ->
+          header_value
+          |> String.split(";")
+          |> List.first()
+
+        _ ->
+          nil
+      end
+
+    private_data = Map.put(private_data, :operation_id, operation_id)
+    conn = Conn.put_private(conn, :open_api_spex, private_data)
+
+    case cast_and_validate(spec, operation, conn, content_type, strict?()) do
+      {:ok, conn} ->
+        conn
+
+      {:error, reason} ->
+        opts = render_error.init(reason)
+
+        conn
+        |> render_error.call(opts)
+        |> Plug.Conn.halt()
+    end
+  end
+
+  def call(
+        %{
+          private: %{
+            phoenix_controller: controller,
+            phoenix_action: action,
+            open_api_spex: private_data
+          }
+        } = conn,
+        opts
+      ) do
+    operation =
+      case private_data.operation_lookup[{controller, action}] do
+        nil ->
+          operation_id = controller.open_api_operation(action).operationId
+          operation = private_data.operation_lookup[operation_id]
+
+          operation_lookup =
+            private_data.operation_lookup
+            |> Map.put({controller, action}, operation)
+
+          OpenApiSpex.Plug.Cache.adapter().put(
+            private_data.spec_module,
+            {private_data.spec, operation_lookup}
+          )
+
+          operation
+
+        operation ->
+          operation
+      end
+
+    if operation.operationId do
+      call(conn, Map.put(opts, :operation_id, operation.operationId))
+    else
+      raise "operationId was not found in action API spec"
+    end
+  end
+
+  def call(conn, opts), do: OpenApiSpex.Plug.CastAndValidate.call(conn, opts)
+
+  defp cast_and_validate(spec, operation, conn, content_type, true = _strict) do
+    OpenApiSpex.cast_and_validate(spec, operation, conn, content_type)
+  end
+
+  defp cast_and_validate(spec, operation, conn, content_type, false = _strict) do
+    case OpenApiSpex.cast_and_validate(spec, operation, conn, content_type) do
+      {:ok, conn} ->
+        {:ok, conn}
+
+      # Remove unexpected query params and cast/validate again
+      {:error, errors} ->
+        query_params =
+          Enum.reduce(errors, conn.query_params, fn
+            %{reason: :unexpected_field, name: name, path: [name]}, params ->
+              Map.delete(params, name)
+
+            %{reason: :invalid_enum, name: nil, path: path, value: value}, params ->
+              path = path |> Enum.reverse() |> tl() |> Enum.reverse() |> list_items_to_string()
+              update_in(params, path, &List.delete(&1, value))
+
+            _, params ->
+              params
+          end)
+
+        conn = %Conn{conn | query_params: query_params}
+        OpenApiSpex.cast_and_validate(spec, operation, conn, content_type)
+    end
+  end
+
+  defp list_items_to_string(list) do
+    Enum.map(list, fn
+      i when is_atom(i) -> to_string(i)
+      i -> i
+    end)
+  end
+
+  defp strict?, do: Pleroma.Config.get([__MODULE__, :strict], false)
+end

lib/pleroma/web/api_spec/render_error.ex

@@ -17,6 +17,9 @@ defmodule Pleroma.Web.ApiSpec.RenderError do
   def call(conn, errors) do
     errors =
       Enum.map(errors, fn
+        %{name: nil, reason: :invalid_enum} = err ->
+          %OpenApiSpex.Cast.Error{err | name: err.value}
+
         %{name: nil} = err ->
           %OpenApiSpex.Cast.Error{err | name: List.last(err.path)}
 

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

@@ -27,7 +27,7 @@ defmodule Pleroma.Web.MastodonAPI.AccountController do
   alias Pleroma.Web.OAuth.Token
   alias Pleroma.Web.TwitterAPI.TwitterAPI
 
-  plug(OpenApiSpex.Plug.CastAndValidate, render_error: Pleroma.Web.ApiSpec.RenderError)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
 
   plug(:skip_plug, [OAuthScopesPlug, EnsurePublicOrAuthenticatedPlug] when action == :create)
 

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

@@ -22,7 +22,7 @@ defmodule Pleroma.Web.MastodonAPI.AppController do
 
   plug(OAuthScopesPlug, %{scopes: ["read"]} when action == :verify_credentials)
 
-  plug(OpenApiSpex.Plug.CastAndValidate)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
 
   @local_mastodon_name "Mastodon-Local"
 

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

@@ -5,7 +5,7 @@
 defmodule Pleroma.Web.MastodonAPI.CustomEmojiController do
   use Pleroma.Web, :controller
 
-  plug(OpenApiSpex.Plug.CastAndValidate)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
 
   plug(
     :skip_plug,

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

@@ -8,7 +8,7 @@ defmodule Pleroma.Web.MastodonAPI.DomainBlockController do
   alias Pleroma.Plugs.OAuthScopesPlug
   alias Pleroma.User
 
-  plug(OpenApiSpex.Plug.CastAndValidate)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
   defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.DomainBlockOperation
 
   plug(

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

@@ -13,7 +13,7 @@ defmodule Pleroma.Web.MastodonAPI.NotificationController do
 
   @oauth_read_actions [:show, :index]
 
-  plug(OpenApiSpex.Plug.CastAndValidate, render_error: Pleroma.Web.ApiSpec.RenderError)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
 
   plug(
     OAuthScopesPlug,

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

@@ -9,7 +9,7 @@ defmodule Pleroma.Web.MastodonAPI.ReportController do
 
   action_fallback(Pleroma.Web.MastodonAPI.FallbackController)
 
-  plug(OpenApiSpex.Plug.CastAndValidate, render_error: Pleroma.Web.ApiSpec.RenderError)
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
   plug(OAuthScopesPlug, %{scopes: ["write:reports"]} when action == :create)
 
   defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.ReportOperation