From c0327ff31f839e1beae59486bf92d7e1c4689b06 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Wed, 9 Mar 2022 08:46:05 +0100
Subject: [PATCH] Fix invalid language resulting in no fallback being set on
 statuses (#17722)

---
 app/helpers/languages_helper.rb       | 9 +++++++++
 app/services/post_status_service.rb   | 2 +-
 app/services/update_status_service.rb | 2 +-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/app/helpers/languages_helper.rb b/app/helpers/languages_helper.rb
index f22cc6d284..9be35ad8ee 100644
--- a/app/helpers/languages_helper.rb
+++ b/app/helpers/languages_helper.rb
@@ -241,6 +241,15 @@ module LanguagesHelper
     code
   end
 
+  def valid_locale_cascade(*arr)
+    arr.each do |str|
+      locale = valid_locale_or_nil(str)
+      return locale if locale.present?
+    end
+
+    nil
+  end
+
   def valid_locale?(locale)
     locale.present? && SUPPORTED_LOCALES.key?(locale.to_sym)
   end
diff --git a/app/services/post_status_service.rb b/app/services/post_status_service.rb
index b3bc4a0a29..7508c3b646 100644
--- a/app/services/post_status_service.rb
+++ b/app/services/post_status_service.rb
@@ -162,7 +162,7 @@ class PostStatusService < BaseService
       sensitive: @sensitive,
       spoiler_text: @options[:spoiler_text] || '',
       visibility: @visibility,
-      language: valid_locale_or_nil(@options[:language].presence || @account.user&.preferred_posting_language || I18n.default_locale),
+      language: valid_locale_cascade(@options[:language], @account.user&.preferred_posting_language, I18n.default_locale),
       application: @options[:application],
       rate_limit: @options[:with_rate_limit],
     }.compact
diff --git a/app/services/update_status_service.rb b/app/services/update_status_service.rb
index 93203bc494..973e6ddee9 100644
--- a/app/services/update_status_service.rb
+++ b/app/services/update_status_service.rb
@@ -94,7 +94,7 @@ class UpdateStatusService < BaseService
     @status.text         = @options[:text].presence || @options.delete(:spoiler_text) || '' if @options.key?(:text)
     @status.spoiler_text = @options[:spoiler_text] || '' if @options.key?(:spoiler_text)
     @status.sensitive    = @options[:sensitive] || @options[:spoiler_text].present? if @options.key?(:sensitive) || @options.key?(:spoiler_text)
-    @status.language     = valid_locale_or_nil(@options[:language] || @status.language || @status.account.user&.preferred_posting_language || I18n.default_locale)
+    @status.language     = valid_locale_cascade(@options[:language], @status.language, @status.account.user&.preferred_posting_language, I18n.default_locale)
     @status.edited_at    = Time.now.utc
 
     @status.save!