FEATURE: Translate full topics

assets/javascripts/discourse/components/show-original-content.gjs

@@ -0,0 +1,39 @@
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import { action } from "@ember/object";
+import { service } from "@ember/service";
+import DButton from "discourse/components/d-button";
+import concatClass from "discourse/helpers/concat-class";
+
+export default class ShowOriginalContent extends Component {
+  @service router;
+  @tracked active = true;
+
+  constructor() {
+    super(...arguments);
+    this.active = !new URLSearchParams(window.location.search).has("show");
+  }
+
+  @action
+  async showOriginal() {
+    this.active = !this.active;
+    window.location.search = this.active ? "" : `show=original`;
+  }
+
+  get title() {
+    return this.active
+      ? "translator.hide_translation"
+      : "translator.show_translation";
+  }
+
+  <template>
+    <div class="discourse-translator_toggle-original">
+      <DButton
+        @icon="language"
+        @title={{this.title}}
+        class={{concatClass "btn btn-default" (if this.active "active")}}
+        @action={{this.showOriginal}}
+      />
+    </div>
+  </template>
+}

assets/javascripts/discourse/initializers/extend-for-translate-button.js

@@ -5,6 +5,7 @@ import { withPluginApi } from "discourse/lib/plugin-api";
 import { i18n } from "discourse-i18n";
 import LanguageSwitcher from "../components/language-switcher";
 import ToggleTranslationButton from "../components/post-menu/toggle-translation-button";
+import ShowOriginalContent from "../components/show-original-content";
 import TranslatedPost from "../components/translated-post";
 
 function initializeTranslation(api) {
@@ -22,8 +23,9 @@ function initializeTranslation(api) {
       { before: ["search"] }
     );
   }
-
-  if (currentUser) {
+  if (siteSettings.experimental_topic_translation) {
+    api.renderInOutlet("topic-navigation", ShowOriginalContent);
+  } else {
     customizePostMenu(api);
   }
 }

assets/stylesheets/common/common.scss

@@ -2,3 +2,19 @@
   .fk-d-menu__inner-content {
   max-height: 50vh;
 }
+
+.topic-navigation.with-timeline .discourse-translator_toggle-original {
+  margin-bottom: 0.5em;
+}
+
+.topic-navigation.with-topic-progress
+  .discourse-translator_toggle-original
+  button {
+  height: 100%;
+}
+
+.discourse-translator_toggle-original {
+  button.active svg {
+    color: var(--tertiary);
+  }
+}

config/locales/server.en.yml

@@ -20,6 +20,7 @@ en:
     experimental_anon_language_switcher: "Enable experimental language switcher for anonymous users. This will allow anonymous users to switch between translated versions of Discourse and user-contributed content in topics."
     errors:
       set_locale_cookie_requirements: "The experimental language switcher for anonymous users requires the `set locale from cookie` site setting to be enabled."
+    experimental_topic_translation: "Enable experimental topic translation feature. This replaces existing post in-line translation with a button that allows users to translate the entire topic."
   translator:
     failed: "The translator is unable to translate this content (%{source_locale}) to the default language of this site (%{target_locale})."
     not_supported: "This language is not supported by the translator."

config/settings.yml

@@ -106,3 +106,6 @@ discourse_translator:
     default: false
     client: true
     validator: "LanguageSwitcherSettingValidator"
+  experimental_topic_translation:
+    default: false
+    client: true

lib/discourse_translator/translator_helper.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module DiscourseTranslator
+  module TranslatorHelper
+    def self.translated_value(original_value, model, scope)
+      return original_value if !SiteSetting.experimental_topic_translation
+      return original_value if scope.request.params["show"] == "original"
+
+      translated = model.custom_fields[TRANSLATED_CUSTOM_FIELD]
+      return original_value if (translated.blank? || translated[I18n.locale].blank?)
+
+      translated[I18n.locale]
+    end
+  end
+end

plugin.rb

@@ -47,4 +47,13 @@ module ::DiscourseTranslator
   add_to_serializer :post, :can_translate do
     scope.can_translate?(object)
   end
+
+  add_to_serializer :post, :cooked, respect_plugin_enabled: false do
+    return super() if cooked_hidden
+    DiscourseTranslator::TranslatorHelper.translated_value(super(), object, scope)
+  end
+
+  add_to_serializer :basic_topic, :fancy_title do
+    DiscourseTranslator::TranslatorHelper.translated_value(object.fancy_title, object, scope)
+  end
 end

spec/serializers/basic_topic_serializer_spec.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe BasicTopicSerializer do
+  let!(:guardian) { Guardian.new(user) }
+  let!(:original_title) { "FUS ROH DAAHHH" }
+  let!(:jap_title) { "フス・ロ・ダ・ア" }
+
+  describe "#fancy_title" do
+    fab!(:user) { Fabricate(:user, locale: "ja") }
+    fab!(:topic)
+
+    before do
+      topic.title = original_title
+      SiteSetting.experimental_topic_translation = true
+      I18n.locale = "ja"
+    end
+
+    def serialize_topic(guardian_user: user, params: {})
+      env = { "action_dispatch.request.parameters" => params, "REQUEST_METHOD" => "GET" }
+      request = ActionDispatch::Request.new(env)
+      guardian = Guardian.new(guardian_user, request)
+      BasicTopicSerializer.new(topic, scope: guardian)
+    end
+
+    it "returns original fancy_title when experimental_topic_translation is disabled" do
+      SiteSetting.experimental_topic_translation = false
+      topic.custom_fields[DiscourseTranslator::TRANSLATED_CUSTOM_FIELD] = { "ja" => jap_title }
+
+      expect(serialize_topic.fancy_title).to eq(original_title)
+    end
+
+    it "returns original fancy_title when show_original param is present" do
+      topic.custom_fields[DiscourseTranslator::TRANSLATED_CUSTOM_FIELD] = { "ja" => jap_title }
+      expect(serialize_topic(params: { "show" => "original" }).fancy_title).to eq(original_title)
+    end
+
+    it "returns original fancy_title when no translation exists" do
+      expect(serialize_topic.fancy_title).to eq(original_title)
+    end
+
+    it "returns original fancy_title when translation is blank for current locale" do
+      topic.custom_fields[DiscourseTranslator::TRANSLATED_CUSTOM_FIELD] = { "ja" => "" }
+      expect(serialize_topic.fancy_title).to eq(original_title)
+    end
+
+    it "returns translated title when translation exists for current locale" do
+      topic.custom_fields[DiscourseTranslator::TRANSLATED_CUSTOM_FIELD] = { "ja" => jap_title }
+      expect(serialize_topic.fancy_title).to eq(jap_title)
+    end
+  end
+end

spec/serializers/post_serializer_spec.rb

@@ -80,4 +80,44 @@
       end
     end
   end
+
+  describe "#cooked" do
+    def serialize_post(guardian_user: user, params: {})
+      env = { "action_dispatch.request.parameters" => params, "REQUEST_METHOD" => "GET" }
+      request = ActionDispatch::Request.new(env)
+      guardian = Guardian.new(guardian_user, request)
+      PostSerializer.new(post, scope: guardian)
+    end
+
+    before { SiteSetting.experimental_topic_translation = true }
+
+    it "returns original cooked when experimental_topic_translation is disabled" do
+      SiteSetting.experimental_topic_translation = false
+      original_cooked = post.cooked
+      expect(serialize_post.cooked).to eq(original_cooked)
+    end
+
+    it "returns original cooked when show=original param is present" do
+      original_cooked = post.cooked
+      I18n.locale = "ja"
+      post.custom_fields[DiscourseTranslator::TRANSLATED_CUSTOM_FIELD] = { "ja" => "こんにちは" }
+      expect(serialize_post(params: { "show" => "original" }).cooked).to eq(original_cooked)
+      expect(serialize_post(params: { "show" => "derp" }).cooked).to eq("こんにちは")
+    end
+
+    it "returns translated content based on locale" do
+      I18n.locale = "ja"
+      post.custom_fields[DiscourseTranslator::TRANSLATED_CUSTOM_FIELD] = {
+        "ja" => "こんにちは",
+        "es" => "Hola",
+      }
+      expect(serialize_post.cooked).to eq("こんにちは")
+    end
+
+    it "returns original cooked when plugin is disabled" do
+      SiteSetting.translator_enabled = false
+      original_cooked = post.cooked
+      expect(serialize_post.cooked).to eq(original_cooked)
+    end
+  end
 end