Change “Translate” button to only show up when a translation backend is configured (#19434)

* Change “Translate” button to only show up when a translation backend is configured

Fixes #19346

* Add `translation` attribute to /api/v2/instance to expose whether the translation feature is enabled

Fixes #19328

5 files changed, 13 insertions, 2 deletions

diff --git a/app/javascript/mastodon/components/status_content.js b/app/javascript/mastodon/components/status_content.js
index 6ad3e018a..0ed79e658 100644
--- a/app/javascript/mastodon/components/status_content.js
+++ b/app/javascript/mastodon/components/status_content.js
@@ -6,7 +6,7 @@ import Permalink from './permalink';
 import classnames from 'classnames';
 import PollContainer from 'mastodon/containers/poll_container';
 import Icon from 'mastodon/components/icon';
-import { autoPlayGif, languages as preloadedLanguages } from 'mastodon/initial_state';
+import { autoPlayGif, languages as preloadedLanguages, translationEnabled } from 'mastodon/initial_state';
 
 const MAX_HEIGHT = 642; // 20px * 32 (+ 2px padding at the top)
 
@@ -181,7 +181,7 @@ class StatusContent extends React.PureComponent {
     const hidden = this.props.onExpandedToggle ? !this.props.expanded : this.state.hidden;
     const renderReadMore = this.props.onClick && status.get('collapsed');
     const renderViewThread = this.props.showThread && status.get('in_reply_to_id') && status.get('in_reply_to_account_id') === status.getIn(['account', 'id']);
-    const renderTranslate = this.context.identity.signedIn && this.props.onTranslate && ['public', 'unlisted'].includes(status.get('visibility')) && status.get('contentHtml').length > 0 && status.get('language') !== null && intl.locale !== status.get('language');
+    const renderTranslate = translationEnabled && this.context.identity.signedIn && this.props.onTranslate && ['public', 'unlisted'].includes(status.get('visibility')) && status.get('contentHtml').length > 0 && status.get('language') !== null && intl.locale !== status.get('language');
     const language = preloadedLanguages.find(lang => lang[0] === status.get('language'));
     const languageName = language ? language[2] : status.get('language');
 
diff --git a/app/javascript/mastodon/initial_state.js b/app/javascript/mastodon/initial_state.js
index f9843f7f8..bb05dafdf 100644
--- a/app/javascript/mastodon/initial_state.js
+++ b/app/javascript/mastodon/initial_state.js
@@ -77,6 +77,7 @@
  * @property {boolean} use_blurhash
  * @property {boolean=} use_pending_items
  * @property {string} version
+ * @property {boolean} translation_enabled
  */
 
 /**
@@ -125,6 +126,7 @@ export const unfollowModal = getMeta('unfollow_modal');
 export const useBlurhash = getMeta('use_blurhash');
 export const usePendingItems = getMeta('use_pending_items');
 export const version = getMeta('version');
+export const translationEnabled = getMeta('translation_enabled');
 export const languages = initialState?.languages;
 
 export default initialState;
diff --git a/app/lib/translation_service.rb b/app/lib/translation_service.rb
index 526e26ae5..285f30939 100644
--- a/app/lib/translation_service.rb
+++ b/app/lib/translation_service.rb
@@ -17,6 +17,10 @@ class TranslationService
     end
   end
 
+  def self.configured?
+    ENV['DEEPL_API_KEY'].present? || ENV['LIBRE_TRANSLATE_ENDPOINT'].present?
+  end
+
   def translate(_text, _source_language, _target_language)
     raise NotImplementedError
   end
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index ba446854c..02e45a92e 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -31,6 +31,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       timeline_preview: Setting.timeline_preview,
       activity_api_enabled: Setting.activity_api_enabled,
       single_user_mode: Rails.configuration.x.single_user_mode,
+      translation_enabled: TranslationService.configured?,
     }
 
     if object.current_account
diff --git a/app/serializers/rest/instance_serializer.rb b/app/serializers/rest/instance_serializer.rb
index 7d00b20ba..606e7d831 100644
--- a/app/serializers/rest/instance_serializer.rb
+++ b/app/serializers/rest/instance_serializer.rb
@@ -72,6 +72,10 @@ class REST::InstanceSerializer < ActiveModel::Serializer
         min_expiration: PollValidator::MIN_EXPIRATION,
         max_expiration: PollValidator::MAX_EXPIRATION,
       },
+
+      translation: {
+        enabled: TranslationService.configured?,
+      },
     }
   end