allow uploading favicon in appearance settings

app/controllers/admin/appearances_controller.rb

@@ -41,6 +41,13 @@ class Admin::AppearancesController < Admin::ApplicationController
     redirect_to admin_appearances_path, notice: 'Header logo was succesfully removed.'
   end
+  def favicon
+    @appearance.remove_favicon!
+    @appearance.save
+
+    redirect_to admin_appearances_path, notice: 'Favicon was succesfully removed.'
+  end
+
   private
   # Use callbacks to share common setup or constraints between actions.
@@ -61,6 +68,8 @@ class Admin::AppearancesController < Admin::ApplicationController
       logo_cache
       header_logo
       header_logo_cache
+      favicon
+      favicon_cache
       new_project_guidelines
       updated_by
     ]

app/controllers/concerns/uploads_actions.rb

@@ -2,7 +2,7 @@ module UploadsActions
   include Gitlab::Utils::StrongMemoize
   include SendFileUpload
-  UPLOAD_MOUNTS = %w(avatar attachment file logo header_logo).freeze
+  UPLOAD_MOUNTS = %w(avatar attachment file logo header_logo favicon).freeze
   def create
     link_to_file = UploadService.new(model, params[:file], uploader_class).execute

app/models/appearance.rb

@@ -14,6 +14,7 @@ class Appearance < ActiveRecord::Base
   mount_uploader :logo,         AttachmentUploader
   mount_uploader :header_logo,  AttachmentUploader
+  mount_uploader :favicon,      FaviconUploader
   # Overrides CacheableAttributes.current_without_cache
   def self.current_without_cache

app/views/admin/appearances/_form.html.haml

@@ -55,6 +55,23 @@
       .hint
         Guidelines parsed with #{link_to "GitLab Flavored Markdown", help_page_path('user/markdown'), target: '_blank'}.
+  %fieldset.app_logo
+    %legend
+      Favicon:
+  .form-group
+    = f.label :favicon, 'Favicon', class: 'control-label'
+    .col-sm-10
+      - if @appearance.favicon?
+        = image_tag @appearance.favicon.default_without_format_conversion.url, class: 'appearance-light-logo-preview'
+        - if @appearance.persisted?
+          %br
+          = link_to 'Remove favicon', favicon_admin_appearances_path, data: { confirm: "Favicon will be removed. Are you sure?"}, method: :delete, class: "btn btn-remove btn-sm remove-logo"
+        %hr
+      = f.hidden_field :favicon_cache
+      = f.file_field :favicon, class: ''
+      .hint
+        Maximum file size is 1MB. The resulting favicons will be cropped to be square and scaled down to a size of 32x32 px.
+
   .form-actions
     = f.submit 'Save', class: 'btn btn-save append-right-10'
     - if @appearance.persisted?

config/routes/admin.rb

@@ -102,6 +102,7 @@ namespace :admin do
       get :preview_sign_in
       delete :logo
       delete :header_logos
+      delete :favicon
     end
   end

config/routes/uploads.rb

@@ -17,7 +17,7 @@ scope path: :uploads do
   # Appearance
   get "-/system/:model/:mounted_as/:id/:filename",
       to:           "uploads#show",
-      constraints:  { model: /appearance/, mounted_as: /logo|header_logo/, filename: /.+/ }
+      constraints:  { model: /appearance/, mounted_as: /logo|header_logo|favicon/, filename: /.+/ }
   # Project markdown uploads
   get ":namespace_id/:project_id/:secret/:filename",

db/migrate/20170925184228_add_favicon_to_appearances.rb

+class AddFaviconToAppearances < ActiveRecord::Migration
+  DOWNTIME = false
+
+  def change
+    add_column :appearances, :favicon, :string
+  end
+end

db/schema.rb

@@ -38,6 +38,7 @@ ActiveRecord::Schema.define(version: 20180529152628) do
     t.integer "cached_markdown_version"
     t.text "new_project_guidelines"
     t.text "new_project_guidelines_html"
+    t.string "favicon"
   end
   create_table "application_setting_terms", force: :cascade do |t|