Improve readability

lib/pleroma/config/deprecation_warnings.ex

@@ -23,7 +23,7 @@ defmodule Pleroma.Config.DeprecationWarnings do
   def check_simple_policy_tuples do
     has_strings =
       Config.get([:mrf_simple])
-      |> Enum.any?(fn {_, v} -> Enum.any?(v, fn e -> is_binary(e) end) end)
+      |> Enum.any?(fn {_, v} -> Enum.any?(v, &is_binary/1) end)
 
     if has_strings do
       Logger.warn("""
@@ -81,8 +81,7 @@ defmodule Pleroma.Config.DeprecationWarnings do
   end
 
   def check_quarantined_instances_tuples do
-    has_strings =
-      Config.get([:instance, :quarantined_instances]) |> Enum.any?(fn e -> is_binary(e) end)
+    has_strings = Config.get([:instance, :quarantined_instances]) |> Enum.any?(&is_binary/1)
 
     if has_strings do
       Logger.warn("""
@@ -119,8 +118,7 @@ defmodule Pleroma.Config.DeprecationWarnings do
   end
 
   def check_transparency_exclusions_tuples do
-    has_strings =
-      Config.get([:mrf, :transparency_exclusions]) |> Enum.any?(fn e -> is_binary(e) end)
+    has_strings = Config.get([:mrf, :transparency_exclusions]) |> Enum.any?(&is_binary/1)
 
     if has_strings do
       Logger.warn("""

lib/pleroma/web/activity_pub/mrf/reject_non_public.ex

@@ -47,7 +47,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.RejectNonPublic do
 
   @impl true
   def describe,
-    do: {:ok, %{mrf_rejectnonpublic: Config.get(:mrf_rejectnonpublic) |> Enum.into(%{})}}
+    do: {:ok, %{mrf_rejectnonpublic: Config.get(:mrf_rejectnonpublic) |> Map.new()}}
 
   @impl true
   def config_description do

lib/pleroma/web/activity_pub/mrf/simple_policy.ex

@@ -262,14 +262,16 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
     mrf_simple_excluded =
       Config.get(:mrf_simple)
-      |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn {v, _} -> v in exclusions end)} end)
+      |> Enum.map(fn {rule, instances} ->
+        {rule, Enum.reject(instances, fn {host, _} -> host in exclusions end)}
+      end)
 
     mrf_simple =
       mrf_simple_excluded
-      |> Enum.map(fn {k, v} ->
-        {k, Enum.map(v, fn {instance, _} -> instance end)}
+      |> Enum.map(fn {rule, instances} ->
+        {rule, Enum.map(instances, fn {host, _} -> host end)}
       end)
-      |> Enum.into(%{})
+      |> Map.new()
 
     # This is for backwards compatibility. We originally didn't sent
     # extra info like a reason why an instance was rejected/quarantined/etc.
@@ -277,12 +279,19 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
     # to add an extra "info" key.
     mrf_simple_info =
       mrf_simple_excluded
-      |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn {_, reason} -> reason == "" end)} end)
-      |> Enum.reject(fn {_, v} -> v == [] end)
-      |> Enum.map(fn {k, l} ->
-        {k, l |> Enum.map(fn {i, r} -> {i, %{"reason" => r}} end) |> Enum.into(%{})}
+      |> Enum.map(fn {rule, instances} ->
+        {rule, Enum.reject(instances, fn {_, reason} -> reason == "" end)}
       end)
-      |> Enum.into(%{})
+      |> Enum.reject(fn {_, instances} -> instances == [] end)
+      |> Enum.map(fn {rule, instances} ->
+        instances =
+          instances
+          |> Enum.map(fn {host, reason} -> {host, %{"reason" => reason}} end)
+          |> Map.new()
+
+        {rule, instances}
+      end)
+      |> Map.new()
 
     {:ok, %{mrf_simple: mrf_simple, mrf_simple_info: mrf_simple_info}}
   end

lib/pleroma/web/activity_pub/mrf/user_allow_list_policy.ex

@@ -37,7 +37,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.UserAllowListPolicy do
   def describe do
     mrf_user_allowlist =
       Config.get([:mrf_user_allowlist], [])
-      |> Enum.into(%{}, fn {k, v} -> {k, length(v)} end)
+      |> Map.new(fn {k, v} -> {k, length(v)} end)
 
     {:ok, %{mrf_user_allowlist: mrf_user_allowlist}}
   end

lib/pleroma/web/activity_pub/mrf/vocabulary_policy.ex

@@ -39,7 +39,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicy do
 
   @impl true
   def describe,
-    do: {:ok, %{mrf_vocabulary: Pleroma.Config.get(:mrf_vocabulary) |> Enum.into(%{})}}
+    do: {:ok, %{mrf_vocabulary: Pleroma.Config.get(:mrf_vocabulary) |> Map.new()}}
 
   @impl true
   def config_description do

lib/pleroma/web/mastodon_api/views/instance_view.ex

@@ -95,22 +95,19 @@ defmodule Pleroma.Web.MastodonAPI.InstanceView do
       {:ok, data} = MRF.describe()
 
       data
-      |> Map.merge(%{
-        quarantined_instances:
-          quarantined
-          |> Enum.map(fn {instance, _reason} -> instance end)
-      })
+      |> Map.put(
+        :quarantined_instances,
+        Enum.map(quarantined, fn {instance, _reason} -> instance end)
+      )
       # This is for backwards compatibility. We originally didn't sent
       # extra info like a reason why an instance was rejected/quarantined/etc.
       # Because we didn't want to break backwards compatibility it was decided
       # to add an extra "info" key.
-      |> Map.merge(%{
-        quarantined_instances_info: %{
+      |> Map.put(:quarantined_instances_info, %{
         "quarantined_instances" =>
           quarantined
           |> Enum.map(fn {instance, reason} -> {instance, %{"reason" => reason}} end)
-            |> Enum.into(%{})
-        }
+          |> Map.new()
       })
     else
       %{}