Merge branch 'handle_object_fetch_failures' into 'develop'

Handle object fetch failures gracefully

See merge request pleroma/pleroma!4015

5 files changed, 53 insertions, 46 deletions

diff --git a/lib/pleroma/object.ex b/lib/pleroma/object.ex
index fa5baf1a4..f2ba24abf 100644
--- a/lib/pleroma/object.ex
+++ b/lib/pleroma/object.ex
@@ -177,7 +177,10 @@ defmodule Pleroma.Object do
         ap_id
 
       Keyword.get(options, :fetch) ->
-        Fetcher.fetch_object_from_id!(ap_id, options)
+        case Fetcher.fetch_object_from_id(ap_id, options) do
+          {:ok, object} -> object
+          _ -> nil
+        end
 
       true ->
         get_cached_by_ap_id(ap_id)
diff --git a/lib/pleroma/object/fetcher.ex b/lib/pleroma/object/fetcher.ex
index cc3772563..af5642af4 100644
--- a/lib/pleroma/object/fetcher.ex
+++ b/lib/pleroma/object/fetcher.ex
@@ -72,20 +72,25 @@ defmodule Pleroma.Object.Fetcher do
            {:object, data, Object.normalize(activity, fetch: false)} do
       {:ok, object}
     else
-      {:allowed_depth, false} ->
-        {:error, "Max thread distance exceeded."}
+      {:allowed_depth, false} = e ->
+        log_fetch_error(id, e)
+        {:error, :allowed_depth}
 
-      {:containment, _} ->
-        {:error, "Object containment failed."}
+      {:containment, reason} = e ->
+        log_fetch_error(id, e)
+        {:error, reason}
 
-      {:transmogrifier, {:error, {:reject, e}}} ->
-        {:reject, e}
+      {:transmogrifier, {:error, {:reject, reason}}} = e ->
+        log_fetch_error(id, e)
+        {:reject, reason}
 
-      {:transmogrifier, {:reject, e}} ->
-        {:reject, e}
+      {:transmogrifier, {:reject, reason}} = e ->
+        log_fetch_error(id, e)
+        {:reject, reason}
 
-      {:transmogrifier, _} = e ->
-        {:error, e}
+      {:transmogrifier, reason} = e ->
+        log_fetch_error(id, e)
+        {:error, reason}
 
       {:object, data, nil} ->
         reinject_object(%Object{}, data)
@@ -96,14 +101,21 @@ defmodule Pleroma.Object.Fetcher do
       {:fetch_object, %Object{} = object} ->
         {:ok, object}
 
-      {:fetch, {:error, error}} ->
-        {:error, error}
+      {:fetch, {:error, reason}} = e ->
+        log_fetch_error(id, e)
+        {:error, reason}
 
       e ->
-        e
+        log_fetch_error(id, e)
+        {:error, e}
     end
   end
 
+  defp log_fetch_error(id, error) do
+    Logger.metadata(object: id)
+    Logger.error("Object rejected while fetching #{id} #{inspect(error)}")
+  end
+
   defp prepare_activity_params(data) do
     %{
       "type" => "Create",
@@ -117,26 +129,6 @@ defmodule Pleroma.Object.Fetcher do
     |> Maps.put_if_present("bcc", data["bcc"])
   end
 
-  def fetch_object_from_id!(id, options \\ []) do
-    with {:ok, object} <- fetch_object_from_id(id, options) do
-      object
-    else
-      {:error, %Tesla.Mock.Error{}} ->
-        nil
-
-      {:error, "Object has been deleted"} ->
-        nil
-
-      {:reject, reason} ->
-        Logger.info("Rejected #{id} while fetching: #{inspect(reason)}")
-        nil
-
-      e ->
-        Logger.error("Error while fetching #{id}: #{inspect(e)}")
-        nil
-    end
-  end
-
   defp make_signature(id, date) do
     uri = URI.parse(id)
 
@@ -227,8 +219,11 @@ defmodule Pleroma.Object.Fetcher do
             {:error, {:content_type, nil}}
         end
 
+      {:ok, %{status: code}} when code in [401, 403] ->
+        {:error, :forbidden}
+
       {:ok, %{status: code}} when code in [404, 410] ->
-        {:error, "Object has been deleted"}
+        {:error, :not_found}
 
       {:error, e} ->
         {:error, e}
diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 3b0140d96..3980ef7b8 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -1698,9 +1698,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
            Fetcher.fetch_and_contain_remote_object_from_id(first) do
       {:ok, false}
     else
-      {:error, {:ok, %{status: code}}} when code in [401, 403] -> {:ok, true}
-      {:error, _} = e -> e
-      e -> {:error, e}
+      {:error, _} -> {:ok, true}
     end
   end
 
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 68f3e1399..a4cf395f2 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -23,7 +23,6 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
 
   import Ecto.Query
 
-  require Logger
   require Pleroma.Constants
 
   @doc """
@@ -155,8 +154,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
         |> Map.put("context", replied_object.data["context"] || object["conversation"])
         |> Map.drop(["conversation", "inReplyToAtomUri"])
       else
-        e ->
-          Logger.warning("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
+        _ ->
           object
       end
     else
@@ -181,8 +179,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
       {:quoting?, _} ->
         object
 
-      e ->
-        Logger.warning("Couldn't fetch #{inspect(quote_url)}, error: #{inspect(e)}")
+      _ ->
         object
     end
   end
@@ -856,8 +853,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
            relative_object do
       Map.put(data, "object", external_url)
     else
-      {:fetch, e} ->
-        Logger.error("Couldn't fetch #{object} #{inspect(e)}")
+      {:fetch, _} ->
         data
 
       _ ->
diff --git a/lib/pleroma/workers/remote_fetcher_worker.ex b/lib/pleroma/workers/remote_fetcher_worker.ex
index d2a77aa17..d526a99cb 100644
--- a/lib/pleroma/workers/remote_fetcher_worker.ex
+++ b/lib/pleroma/workers/remote_fetcher_worker.ex
@@ -9,7 +9,22 @@ defmodule Pleroma.Workers.RemoteFetcherWorker do
 
   @impl Oban.Worker
   def perform(%Job{args: %{"op" => "fetch_remote", "id" => id} = args}) do
-    {:ok, _object} = Fetcher.fetch_object_from_id(id, depth: args["depth"])
+    case Fetcher.fetch_object_from_id(id, depth: args["depth"]) do
+      {:ok, _object} ->
+        :ok
+
+      {:error, :forbidden} ->
+        {:discard, :forbidden}
+
+      {:error, :not_found} ->
+        {:discard, :not_found}
+
+      {:error, :allowed_depth} ->
+        {:discard, :allowed_depth}
+
+      _ ->
+        :error
+    end
   end
 
   @impl Oban.Worker