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-rw-r--r--config/application.rb1
-rw-r--r--config/environments/production.rb12
-rw-r--r--config/i18n-tasks.yml1
-rw-r--r--config/initializers/content_security_policy.rb45
-rw-r--r--config/initializers/cors.rb4
-rw-r--r--config/initializers/doorkeeper.rb2
-rw-r--r--config/initializers/locale.rb6
-rw-r--r--config/locales/doorkeeper.en.yml2
-rw-r--r--config/locales/en.yml5
-rw-r--r--config/locales/ja.yml2
-rw-r--r--config/locales/pl.yml2
-rw-r--r--config/locales/simple_form.en.yml6
-rw-r--r--config/locales/simple_form.ja.yml1
-rw-r--r--config/locales/simple_form.pl.yml5
-rw-r--r--config/navigation.rb6
-rw-r--r--config/routes.rb16
-rw-r--r--config/settings.yml11
-rw-r--r--config/themes.yml3
-rw-r--r--config/webpack/configuration.js57
-rw-r--r--config/webpack/generateLocalePacks.js94
-rw-r--r--config/webpack/rules/babel.js1
-rw-r--r--config/webpack/rules/css.js1
-rw-r--r--config/webpack/shared.js75
-rw-r--r--config/webpacker.yml1
24 files changed, 251 insertions, 108 deletions
diff --git a/config/application.rb b/config/application.rb
index 74006f5fa..150fdce6c 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -10,6 +10,7 @@ require_relative '../app/lib/exceptions'
 require_relative '../lib/paperclip/lazy_thumbnail'
 require_relative '../lib/paperclip/gif_transcoder'
 require_relative '../lib/paperclip/video_transcoder'
+require_relative '../lib/paperclip/audio_transcoder'
 require_relative '../lib/mastodon/snowflake'
 require_relative '../lib/mastodon/version'
 require_relative '../lib/devise/ldap_authenticatable'
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 70baa6ad1..7a07a8eb0 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -95,10 +95,14 @@ Rails.application.configure do
   config.action_mailer.delivery_method = ENV.fetch('SMTP_DELIVERY_METHOD', 'smtp').to_sym
 
   config.action_dispatch.default_headers = {
-    'Server'                 => 'Mastodon',
-    'X-Frame-Options'        => 'DENY',
-    'X-Content-Type-Options' => 'nosniff',
-    'X-XSS-Protection'       => '1; mode=block',
+    'Server'                  => 'Mastodon',
+    'X-Frame-Options'         => 'DENY',
+    'X-Content-Type-Options'  => 'nosniff',
+    'X-XSS-Protection'        => '1; mode=block',
+    'Referrer-Policy'         => 'same-origin',
+    'Strict-Transport-Security' => 'max-age=63072000; includeSubDomains; preload',
+    'X-Clacks-Overhead' => 'GNU Natalie Nguyen'
+
   }
 
   config.x.otp_secret = ENV.fetch('OTP_SECRET')
diff --git a/config/i18n-tasks.yml b/config/i18n-tasks.yml
index 1bcac154b..b2a621e85 100644
--- a/config/i18n-tasks.yml
+++ b/config/i18n-tasks.yml
@@ -59,4 +59,5 @@ ignore_unused:
   - 'errors.429'
   - 'admin.accounts.roles.*'
   - 'admin.action_logs.actions.*'
+  - 'themes.*'
   - 'statuses.attached.*'
diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
index 59cfbba17..12b764a5a 100644
--- a/config/initializers/content_security_policy.rb
+++ b/config/initializers/content_security_policy.rb
@@ -2,29 +2,32 @@
 # For further information see the following documentation
 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
 
-base_host     = Rails.configuration.x.web_domain
-assets_host   = Rails.configuration.action_controller.asset_host
-assets_host ||= "http#{Rails.configuration.x.use_https ? 's' : ''}://#{base_host}"
+if Rails.env.production?
+  assets_host = Rails.configuration.action_controller.asset_host || "https://#{ENV['WEB_DOMAIN'] || ENV['LOCAL_DOMAIN']}"
+  data_hosts = [assets_host]
 
-Rails.application.config.content_security_policy do |p|
-  p.base_uri        :none
-  p.default_src     :none
-  p.frame_ancestors :none
-  p.font_src        :self, assets_host
-  p.img_src         :self, :https, :data, :blob, assets_host
-  p.style_src       :self, :unsafe_inline, assets_host
-  p.media_src       :self, :https, :data, assets_host
-  p.frame_src       :self, :https
-  p.manifest_src    :self, assets_host
-
-  if Rails.env.development?
-    webpacker_urls = %w(ws http).map { |protocol| "#{protocol}#{Webpacker.dev_server.https? ? 's' : ''}://#{Webpacker.dev_server.host_with_port}" }
-
-    p.connect_src :self, :blob, assets_host, Rails.configuration.x.streaming_api_base_url, *webpacker_urls
-    p.script_src  :self, :unsafe_inline, :unsafe_eval, assets_host
+  if ENV['S3_ENABLED'] == 'true'
+    attachments_host = ENV['S3_ALIAS_HOST'] || ENV['S3_CLOUDFRONT_HOST'] || ENV['S3_HOSTNAME'] || "s3-#{ENV['S3_REGION'] || 'us-east-1'}.amazonaws.com"
+  elsif ENV['SWIFT_ENABLED'] == 'true'
+    attachments_host = ENV['SWIFT_OBJECT_URL']
   else
-    p.connect_src :self, :blob, assets_host, Rails.configuration.x.streaming_api_base_url
-    p.script_src  :self, assets_host
+    attachments_host = nil
+  end
+  data_hosts << attachments_host unless attachments_host.nil?
+
+  Rails.application.config.content_security_policy do |p|
+    p.base_uri        :none
+    p.default_src     :none
+    p.frame_ancestors :none
+    p.script_src      :self, assets_host
+    p.font_src        :self, assets_host
+    p.img_src         :self, :data, :blob, *data_hosts
+    p.style_src       :self, :unsafe_inline, assets_host
+    p.media_src       :self, :data, *data_hosts
+    p.frame_src       :self, :https
+    p.worker_src      :self, assets_host
+    p.connect_src     :self, :blob, Rails.configuration.x.streaming_api_base_url, *data_hosts
+    p.manifest_src    :self, assets_host
   end
 end
 
diff --git a/config/initializers/cors.rb b/config/initializers/cors.rb
index 55f8c9c91..bc782bc76 100644
--- a/config/initializers/cors.rb
+++ b/config/initializers/cors.rb
@@ -30,5 +30,9 @@ Rails.application.config.middleware.insert_before 0, Rack::Cors do
       headers: :any,
       methods: [:post],
       credentials: false
+    resource '/assets/*', headers: :any, methods: [:get, :head, :options]
+    resource '/stylesheets/*', headers: :any, methods: [:get, :head, :options]
+    resource '/javascripts/*', headers: :any, methods: [:get, :head, :options]
+    resource '/packs/*', headers: :any, methods: [:get, :head, :options]
   end
 end
diff --git a/config/initializers/doorkeeper.rb b/config/initializers/doorkeeper.rb
index 367eead6a..2a963b32b 100644
--- a/config/initializers/doorkeeper.rb
+++ b/config/initializers/doorkeeper.rb
@@ -58,6 +58,7 @@ Doorkeeper.configure do
   optional_scopes :write,
                   :'write:accounts',
                   :'write:blocks',
+                  :'write:bookmarks',
                   :'write:conversations',
                   :'write:favourites',
                   :'write:filters',
@@ -71,6 +72,7 @@ Doorkeeper.configure do
                   :read,
                   :'read:accounts',
                   :'read:blocks',
+                  :'read:bookmarks',
                   :'read:favourites',
                   :'read:filters',
                   :'read:follows',
diff --git a/config/initializers/locale.rb b/config/initializers/locale.rb
new file mode 100644
index 000000000..04ed31646
--- /dev/null
+++ b/config/initializers/locale.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+I18n.load_path += Dir[Rails.root.join('app', 'javascript', 'flavours', '*', 'names.{rb,yml}').to_s]
+I18n.load_path += Dir[Rails.root.join('app', 'javascript', 'flavours', '*', 'names', '*.{rb,yml}').to_s]
+I18n.load_path += Dir[Rails.root.join('app', 'javascript', 'skins', '*', '*', 'names.{rb,yml}').to_s]
+I18n.load_path += Dir[Rails.root.join('app', 'javascript', 'skins', '*', '*', 'names', '*.{rb,yml}').to_s]
diff --git a/config/locales/doorkeeper.en.yml b/config/locales/doorkeeper.en.yml
index f1fe03716..211b210d7 100644
--- a/config/locales/doorkeeper.en.yml
+++ b/config/locales/doorkeeper.en.yml
@@ -119,6 +119,7 @@ en:
       read: read all your account's data
       read:accounts: see accounts information
       read:blocks: see your blocks
+      read:bookmarks: see your bookmarks
       read:favourites: see your favourites
       read:filters: see your filters
       read:follows: see your follows
@@ -131,6 +132,7 @@ en:
       write: modify all your account's data
       write:accounts: modify your profile
       write:blocks: block accounts and domains
+      write:bookmarks: bookmark statuses
       write:favourites: favourite statuses
       write:filters: create filters
       write:follows: follow people
diff --git a/config/locales/en.yml b/config/locales/en.yml
index e56008a89..bf06dc9ad 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -399,6 +399,9 @@ en:
       hero:
         desc_html: Displayed on the frontpage. At least 600x100px recommended. When not set, falls back to server thumbnail
         title: Hero image
+      hide_followers_count:
+        desc_html: Do not show followers count on user profiles
+        title: Hide followers count
       mascot:
         desc_html: Displayed on multiple pages. At least 293×205px recommended. When not set, falls back to default mascot
         title: Mascot image
@@ -640,6 +643,7 @@ en:
     copy: Copy
     order_by: Order by
     save_changes: Save changes
+    use_this: Use this
     validation_errors:
       one: Something isn't quite right yet! Please review the error below
       other: Something isn't quite right yet! Please review %{count} errors below
@@ -867,6 +871,7 @@ en:
     edit_profile: Edit profile
     export: Data export
     featured_tags: Featured hashtags
+    flavours: Flavours
     identity_proofs: Identity proofs
     import: Import
     migrate: Account migration
diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index f68df9710..f13dbdb68 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -640,6 +640,7 @@ ja:
     copy: コピー
     order_by: 並び順
     save_changes: 変更を保存
+    use_this: これを使う
     validation_errors:
       one: エラーが発生しました! 以下のエラーを確認してください
       other: エラーが発生しました! 以下の%{count}個のエラーを確認してください
@@ -866,6 +867,7 @@ ja:
     edit_profile: プロフィールを編集
     export: データのエクスポート
     featured_tags: 注目のハッシュタグ
+    flavours: フレーバー
     identity_proofs: Identity proofs
     import: データのインポート
     migrate: アカウントの引っ越し
diff --git a/config/locales/pl.yml b/config/locales/pl.yml
index f3da82b1c..e67a55edb 100644
--- a/config/locales/pl.yml
+++ b/config/locales/pl.yml
@@ -649,6 +649,7 @@ pl:
     copy: Kopiuj
     order_by: Uporządkuj według
     save_changes: Zapisz zmiany
+    use_this: Użyj tego
     validation_errors:
       few: Coś jest wciąż nie tak! Przejrzyj %{count} poniższe błędy
       many: Coś jest wciąż nie tak! Przejrzyj %{count} poniższych błędów
@@ -884,6 +885,7 @@ pl:
     edit_profile: Edytuj profil
     export: Eksportowanie danych
     featured_tags: Wyróżnione hashtagi
+    flavours: Odmiany
     identity_proofs: Dowody tożsamości
     import: Importowanie danych
     migrate: Migracja konta
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index 3faaa6ac7..ad9ae7417 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -34,7 +34,7 @@ en:
         setting_hide_network: Who you follow and who follows you will not be shown on your profile
         setting_noindex: Affects your public profile and status pages
         setting_show_application: The application you use to toot will be displayed in the detailed view of your toots
-        setting_theme: Affects how Mastodon looks when you're logged in from any device.
+        setting_skin: Reskins the selected Mastodon flavour
         username: Your username will be unique on %{domain}
         whole_word: When the keyword or phrase is alphanumeric only, it will only be applied if it matches the whole word
       featured_tag:
@@ -100,12 +100,14 @@ en:
         setting_display_media_hide_all: Hide all
         setting_display_media_show_all: Show all
         setting_expand_spoilers: Always expand toots marked with content warnings
+        setting_favourite_modal: Show confirmation dialog before favouriting (applies to Glitch flavour only)
+        setting_hide_followers_count: Hide your followers count
         setting_hide_network: Hide your network
         setting_noindex: Opt-out of search engine indexing
         setting_reduce_motion: Reduce motion in animations
         setting_show_application: Disclose application used to send toots
+        setting_skin: Skin
         setting_system_font_ui: Use system's default font
-        setting_theme: Site theme
         setting_unfollow_modal: Show confirmation dialog before unfollowing someone
         severity: Severity
         type: Import type
diff --git a/config/locales/simple_form.ja.yml b/config/locales/simple_form.ja.yml
index 87ffe9d14..2cade4301 100644
--- a/config/locales/simple_form.ja.yml
+++ b/config/locales/simple_form.ja.yml
@@ -100,6 +100,7 @@ ja:
         setting_display_media_hide_all: 非表示
         setting_display_media_show_all: 表示
         setting_expand_spoilers: 閲覧注意としてマークされたトゥートを常に展開する
+        setting_favourite_modal: お気に入りをする前に確認ダイアログを表示する
         setting_hide_network: 繋がりを隠す
         setting_noindex: 検索エンジンによるインデックスを拒否する
         setting_reduce_motion: アニメーションの動きを減らす
diff --git a/config/locales/simple_form.pl.yml b/config/locales/simple_form.pl.yml
index abc2c17a9..cf624697c 100644
--- a/config/locales/simple_form.pl.yml
+++ b/config/locales/simple_form.pl.yml
@@ -34,7 +34,7 @@ pl:
         setting_hide_network: Informacje o tym, kto Cię śledzi i kogo śledzisz nie będą widoczne
         setting_noindex: Wpływa na widoczność strony profilu i Twoich wpisów
         setting_show_application: W informacjach o wpisie będzie widoczna informacja o aplikacji, z której został wysłany
-        setting_theme: Zmienia wygląd Mastodona po zalogowaniu z dowolnego urządzenia.
+        setting_skin: Zmienia wygląd używanej odmiany Mastodona
         username: Twoja nazwa użytkownika będzie niepowtarzalna na %{domain}
         whole_word: Jeśli słowo lub fraza składa się jedynie z liter lub cyfr, filtr będzie zastosowany tylko do pełnych wystąpień
       featured_tag:
@@ -101,12 +101,13 @@ pl:
         setting_display_media_hide_all: Ukryj wszystko
         setting_display_media_show_all: Pokaż wszystko
         setting_expand_spoilers: Zawsze rozwijaj wpisy oznaczone ostrzeżeniem o zawartości
+        setting_favourite_modal: Pytaj o potwierdzenie przed dodaniem do ulubionych
         setting_hide_network: Ukryj swoją sieć
         setting_noindex: Nie indeksuj mojego profilu w wyszukiwarkach internetowych
         setting_reduce_motion: Ogranicz ruch w animacjach
         setting_show_application: Informuj o aplikacji z której wysłano wpisy
+        setting_skin: Motyw
         setting_system_font_ui: Używaj domyślnej czcionki systemu
-        setting_theme: Motyw strony
         setting_unfollow_modal: Pytaj o potwierdzenie przed cofnięciem śledzenia
         severity: Priorytet
         type: Importowane dane
diff --git a/config/navigation.rb b/config/navigation.rb
index dd5825867..553a672ed 100644
--- a/config/navigation.rb
+++ b/config/navigation.rb
@@ -17,6 +17,12 @@ SimpleNavigation::Configuration.run do |navigation|
       settings.item :identity_proofs, safe_join([fa_icon('key fw'), t('settings.identity_proofs')]), settings_identity_proofs_path, highlights_on: %r{/settings/identity_proofs*}, if: proc { current_account.identity_proofs.exists? }
     end
 
+    primary.item :flavours, safe_join([fa_icon('paint-brush fw'), t('settings.flavours')]), settings_flavours_url do |flavours|
+      Themes.instance.flavours.each do |flavour|
+        flavours.item flavour.to_sym, safe_join([fa_icon('star fw'), t("flavours.#{flavour}.name", default: flavour)]), settings_flavour_url(flavour)
+      end
+    end
+
     primary.item :relationships, safe_join([fa_icon('users fw'), t('settings.relationships')]), relationships_url
     primary.item :filters, safe_join([fa_icon('filter fw'), t('filters.index.title')]), filters_path, highlights_on: %r{/filters}
     primary.item :invites, safe_join([fa_icon('user-plus fw'), t('invites.title')]), invites_path, if: proc { Setting.min_invite_role == 'user' }
diff --git a/config/routes.rb b/config/routes.rb
index 1ea6490b0..260ea63ab 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -89,6 +89,7 @@ Rails.application.routes.draw do
 
   namespace :settings do
     resource :profile, only: [:show, :update]
+
     resource :preferences, only: [:show, :update]
     resource :notifications, only: [:show, :update]
     resource :import, only: [:show, :create]
@@ -116,6 +117,8 @@ Rails.application.routes.draw do
       end
     end
 
+    resources :flavours, only: [:index, :show, :update], param: :flavour
+
     resource :delete, only: [:show, :destroy]
     resource :migration, only: [:show, :update]
 
@@ -274,6 +277,9 @@ Rails.application.routes.draw do
           resource :favourite, only: :create
           post :unfavourite, to: 'favourites#destroy'
 
+          resource :bookmark, only: :create
+          post :unbookmark, to: 'bookmarks#destroy'
+
           resource :mute, only: :create
           post :unmute, to: 'mutes#destroy'
 
@@ -312,8 +318,13 @@ Rails.application.routes.draw do
       resources :follows,      only: [:create]
       resources :media,        only: [:create, :update]
       resources :blocks,       only: [:index]
-      resources :mutes,        only: [:index]
+      resources :mutes,        only: [:index] do
+        collection do
+          get 'details'
+        end
+      end
       resources :favourites,   only: [:index]
+      resources :bookmarks,    only: [:index]
       resources :reports,      only: [:create]
       resources :filters,      only: [:index, :create, :show, :update, :destroy]
       resources :endorsements, only: [:index]
@@ -338,10 +349,11 @@ Rails.application.routes.draw do
         end
       end
 
-      resources :notifications, only: [:index, :show] do
+      resources :notifications, only: [:index, :show, :destroy] do
         collection do
           post :clear
           post :dismiss # Deprecated
+          delete :destroy_multiple
         end
 
         member do
diff --git a/config/settings.yml b/config/settings.yml
index 4f05519a5..c4359f573 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -2,7 +2,7 @@
 # important settings can be changed from the admin interface.
 
 defaults: &defaults
-  site_title: Mastodon
+  site_title: 'dev.glitch.social'
   site_short_description: ''
   site_description: ''
   site_extended_description: ''
@@ -13,23 +13,26 @@ defaults: &defaults
   profile_directory: true
   closed_registrations_message: ''
   open_deletion: true
+  timeline_preview: false
   min_invite_role: 'admin'
-  timeline_preview: true
   show_staff_badge: true
   default_sensitive: false
   hide_network: false
   unfollow_modal: false
   boost_modal: false
+  favourite_modal: false
   delete_modal: true
   auto_play_gif: false
   display_media: 'default'
   expand_spoilers: false
   preview_sensitive_media: false
   reduce_motion: false
-  show_application: true
+  show_application: false
   system_font_ui: false
   noindex: false
-  theme: 'default'
+  hide_followers_count: false
+  flavour: 'glitch'
+  skin: 'default'
   aggregate_reblogs: true
   notification_emails:
     follow: false
diff --git a/config/themes.yml b/config/themes.yml
deleted file mode 100644
index 9c21c9459..000000000
--- a/config/themes.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-default: styles/application.scss
-contrast: styles/contrast.scss
-mastodon-light: styles/mastodon-light.scss
diff --git a/config/webpack/configuration.js b/config/webpack/configuration.js
index 80a094c72..926af9b39 100644
--- a/config/webpack/configuration.js
+++ b/config/webpack/configuration.js
@@ -1,15 +1,61 @@
 // Common configuration for webpacker loaded from config/webpacker.yml
 
-const { resolve } = require('path');
+const { basename, dirname, extname, join, resolve } = require('path');
 const { env } = require('process');
 const { safeLoad } = require('js-yaml');
-const { readFileSync } = require('fs');
+const { lstatSync, readFileSync } = require('fs');
+const glob = require('glob');
 
 const configPath = resolve('config', 'webpacker.yml');
 const settings = safeLoad(readFileSync(configPath), 'utf8')[env.RAILS_ENV || env.NODE_ENV];
+const flavourFiles = glob.sync('app/javascript/flavours/*/theme.yml');
+const skinFiles = glob.sync('app/javascript/skins/*/*');
+const flavours = {};
 
-const themePath = resolve('config', 'themes.yml');
-const themes = safeLoad(readFileSync(themePath), 'utf8');
+const core = function () {
+  const coreFile = resolve('app', 'javascript', 'core', 'theme.yml');
+  const data = safeLoad(readFileSync(coreFile), 'utf8');
+  if (!data.pack_directory) {
+    data.pack_directory = dirname(coreFile);
+  }
+  return data.pack ? data : {};
+}();
+
+for (let i = 0; i < flavourFiles.length; i++) {
+  const flavourFile = flavourFiles[i];
+  const data = safeLoad(readFileSync(flavourFile), 'utf8');
+  data.name = basename(dirname(flavourFile));
+  data.skin = {};
+  if (!data.pack_directory) {
+    data.pack_directory = dirname(flavourFile);
+  }
+  if (data.locales) {
+    data.locales = join(dirname(flavourFile), data.locales);
+  }
+  if (data.pack && typeof data.pack === 'object') {
+    flavours[data.name] = data;
+  }
+}
+
+for (let i = 0; i < skinFiles.length; i++) {
+  const skinFile = skinFiles[i];
+  let skin = basename(skinFile);
+  const name = basename(dirname(skinFile));
+  if (!flavours[name]) {
+    continue;
+  }
+  const data = flavours[name].skin;
+  if (lstatSync(skinFile).isDirectory()) {
+    data[skin] = {};
+    const skinPacks = glob.sync(join(skinFile, '*.{css,scss}'));
+    for (let j = 0; j < skinPacks.length; j++) {
+      const pack = skinPacks[j];
+      data[skin][basename(pack, extname(pack))] = pack;
+    }
+  } else if ((skin = skin.match(/^(.*)\.s?css$/i))) {
+    data[skin[1]] = { common: skinFile };
+  }
+}
 
 function removeOuterSlashes(string) {
   return string.replace(/^\/*/, '').replace(/\/*$/, '');
@@ -31,7 +77,8 @@ const output = {
 
 module.exports = {
   settings,
-  themes,
+  core,
+  flavours,
   env: {
     CDN_HOST: env.CDN_HOST,
     NODE_ENV: env.NODE_ENV,
diff --git a/config/webpack/generateLocalePacks.js b/config/webpack/generateLocalePacks.js
index b71cf2ade..09fba4a18 100644
--- a/config/webpack/generateLocalePacks.js
+++ b/config/webpack/generateLocalePacks.js
@@ -1,52 +1,66 @@
+// A message from upstream:
+// ========================
 // To avoid adding a lot of boilerplate, locale packs are
 // automatically generated here. These are written into the tmp/
 // directory and then used to generate locale_en.js, locale_fr.js, etc.
 
-const fs = require('fs');
-const path = require('path');
+// Glitch note:
+// ============
+// This code has been entirely rewritten to support glitch flavours.
+// However, the underlying process is exactly the same.
+
+const { existsSync, readdirSync, writeFileSync } = require('fs');
+const { join, resolve } = require('path');
 const rimraf = require('rimraf');
 const mkdirp = require('mkdirp');
+const { flavours } = require('./configuration.js');
+
+module.exports = Object.keys(flavours).reduce(function (map, entry) {
+  const flavour = flavours[entry];
+  if (!flavour.locales) {
+    return map;
+  }
+  const locales = readdirSync(flavour.locales).filter(
+    filename => /\.js(?:on)?$/.test(filename) && !/defaultMessages|whitelist|index/.test(filename)
+  );
+  const outPath = resolve('tmp', 'locales', entry);
 
-const localesJsonPath = path.join(__dirname, '../../app/javascript/mastodon/locales');
-const locales = fs.readdirSync(localesJsonPath).filter(filename => {
-  return /\.json$/.test(filename) &&
-    !/defaultMessages/.test(filename) &&
-    !/whitelist/.test(filename);
-}).map(filename => filename.replace(/\.json$/, ''));
-
-const outPath = path.join(__dirname, '../../tmp/packs');
-
-rimraf.sync(outPath);
-mkdirp.sync(outPath);
-
-const outPaths = [];
-
-locales.forEach(locale => {
-  const localePath = path.join(outPath, `locale_${locale}.js`);
-  const baseLocale = locale.split('-')[0]; // e.g. 'zh-TW' -> 'zh'
-  const localeDataPath = [
-    // first try react-intl
-    `../../node_modules/react-intl/locale-data/${baseLocale}.js`,
-    // then check locales/locale-data
-    `../../app/javascript/mastodon/locales/locale-data/${baseLocale}.js`,
-    // fall back to English (this is what react-intl does anyway)
-    '../../node_modules/react-intl/locale-data/en.js',
-  ].filter(filename => fs.existsSync(path.join(outPath, filename)))
-    .map(filename => filename.replace(/..\/..\/node_modules\//, ''))[0];
-
-  const localeContent = `//
-// locale_${locale}.js
+  rimraf.sync(outPath);
+  mkdirp.sync(outPath);
+
+  locales.forEach(function (locale) {
+    const localeName = locale.replace(/\.js(?:on)?$/, '');
+    const localePath = join(outPath, `${localeName}.js`);
+    const baseLocale = localeName.split('-')[0]; // e.g. 'zh-TW' -> 'zh'
+    const localeDataPath = [
+      // first try react-intl
+      `node_modules/react-intl/locale-data/${baseLocale}.js`,
+      // then check locales/locale-data
+      `app/javascript/locales/locale-data/${baseLocale}.js`,
+      // fall back to English (this is what react-intl does anyway)
+      'node_modules/react-intl/locale-data/en.js',
+    ].filter(
+      filename => existsSync(filename)
+    ).map(
+      filename => filename.replace(/(?:node_modules|app\/javascript)\//, '')
+    )[0];
+    const localeContent = `//
+// locales/${entry}/${localeName}.js
 // automatically generated by generateLocalePacks.js
 //
-import messages from '../../app/javascript/mastodon/locales/${locale}.json';
-import localeData from ${JSON.stringify(localeDataPath)};
-import { setLocale } from '../../app/javascript/mastodon/locales';
-setLocale({messages, localeData});
-`;
-  fs.writeFileSync(localePath, localeContent, 'utf8');
-  outPaths.push(localePath);
-});
 
-module.exports = outPaths;
+import messages from '../../../${flavour.locales}/${locale.replace(/\.js$/, '')}';
+import localeData from '${localeDataPath}';
+import { setLocale } from 'locales';
 
+setLocale({
+  localeData,
+  messages,
+});
+`;
+    writeFileSync(localePath, localeContent, 'utf8');
+    map[`locales/${entry}/${localeName}`] = localePath;
+  });
 
+  return map;
+}, {});
diff --git a/config/webpack/rules/babel.js b/config/webpack/rules/babel.js
index 2fc245c43..4d25748ee 100644
--- a/config/webpack/rules/babel.js
+++ b/config/webpack/rules/babel.js
@@ -12,6 +12,7 @@ module.exports = {
     {
       loader: 'babel-loader',
       options: {
+        sourceRoot: 'app/javascript',
         cacheDirectory: join(settings.cache_path, 'babel-loader'),
         cacheCompression: env.NODE_ENV === 'production',
         compact: env.NODE_ENV === 'production',
diff --git a/config/webpack/rules/css.js b/config/webpack/rules/css.js
index 27905a617..9553cb55b 100644
--- a/config/webpack/rules/css.js
+++ b/config/webpack/rules/css.js
@@ -21,6 +21,7 @@ module.exports = {
     {
       loader: 'sass-loader',
       options: {
+        includePaths: ['app/javascript'],
         fiber: require('fibers'),
         implementation: require('sass'),
         sourceMap: true,
diff --git a/config/webpack/shared.js b/config/webpack/shared.js
index cb4e5a85f..b6e2537b1 100644
--- a/config/webpack/shared.js
+++ b/config/webpack/shared.js
@@ -5,33 +5,56 @@ const { basename, dirname, join, relative, resolve } = require('path');
 const { sync } = require('glob');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 const AssetsManifestPlugin = require('webpack-assets-manifest');
-const extname = require('path-complete-extname');
-const { env, settings, themes, output } = require('./configuration');
+const { env, settings, core, flavours, output } = require('./configuration.js');
 const rules = require('./rules');
-const localePackPaths = require('./generateLocalePacks');
+const localePacks = require('./generateLocalePacks');
+
+function reducePacks (data, into = {}) {
+  if (!data.pack) {
+    return into;
+  }
+  Object.keys(data.pack).reduce((map, entry) => {
+    const pack = data.pack[entry];
+    if (!pack) {
+      return map;
+    }
+    const packFile = typeof pack === 'string' ? pack : pack.filename;
+    if (packFile) {
+      map[data.name ? `flavours/${data.name}/${entry}` : `core/${entry}`] = resolve(data.pack_directory, packFile);
+    }
+    return map;
+  }, into);
+  if (data.name) {
+    Object.keys(data.skin).reduce((map, entry) => {
+      const skin = data.skin[entry];
+      const skinName = entry;
+      if (!skin) {
+        return map;
+      }
+      Object.keys(skin).reduce((map, entry) => {
+        const packFile = skin[entry];
+        if (!packFile) {
+          return map;
+        }
+        map[`skins/${data.name}/${skinName}/${entry}`] = resolve(packFile);
+        return map;
+      }, into);
+      return map;
+    }, into);
+  }
+  return into;
+}
+
+const entries = Object.assign(
+  { locales: resolve('app', 'javascript', 'locales') },
+  localePacks,
+  reducePacks(core),
+  Object.keys(flavours).reduce((map, entry) => reducePacks(flavours[entry], map), {})
+);
 
-const extensionGlob = `**/*{${settings.extensions.join(',')}}*`;
-const entryPath = join(settings.source_path, settings.source_entry_path);
-const packPaths = sync(join(entryPath, extensionGlob));
 
 module.exports = {
-  entry: Object.assign(
-    packPaths.reduce((map, entry) => {
-      const localMap = map;
-      const namespace = relative(join(entryPath), dirname(entry));
-      localMap[join(namespace, basename(entry, extname(entry)))] = resolve(entry);
-      return localMap;
-    }, {}),
-    localePackPaths.reduce((map, entry) => {
-      const localMap = map;
-      localMap[basename(entry, extname(entry, extname(entry)))] = resolve(entry);
-      return localMap;
-    }, {}),
-    Object.keys(themes).reduce((themePaths, name) => {
-      themePaths[name] = resolve(join(settings.source_path, themes[name]));
-      return themePaths;
-    }, {})
-  ),
+  entry: entries,
 
   output: {
     filename: 'js/[name]-[chunkhash].js',
@@ -43,7 +66,7 @@ module.exports = {
 
   optimization: {
     runtimeChunk: {
-      name: 'common',
+      name: 'locales',
     },
     splitChunks: {
       cacheGroups: {
@@ -51,7 +74,9 @@ module.exports = {
         vendors: false,
         common: {
           name: 'common',
-          chunks: 'all',
+          chunks (chunk) {
+            return !(chunk.name in entries);
+          },
           minChunks: 2,
           minSize: 0,
           test: /^(?!.*[\\\/]node_modules[\\\/]react-intl[\\\/]).+$/,
diff --git a/config/webpacker.yml b/config/webpacker.yml
index 4ad78a190..9accd6152 100644
--- a/config/webpacker.yml
+++ b/config/webpacker.yml
@@ -26,6 +26,7 @@ default: &default
     - .tiff
     - .ico
     - .svg
+    - .gif
     - .eot
     - .otf
     - .ttf