Merge branch '11489-branded-appearance-to-ce' into 'master'

Branded appearance to CE

Closes #11489 

The difference with the EE version is only that there is no distinction between light and dark logos, though this wasn't used anyway. If this is fine, I'll create a MR on EE too.

TODO:
- [x] Copy docs
- [x] Make new screenshots
- [ ] Remove Custom Welcome message feature?

@rymai: I was unsure what labels to add to ping you, so I just ping you like this :wink: 

/cc @DouweM

See merge request !2927

2 files changed, 60 insertions, 2 deletions

diff --git a/app/controllers/admin/appearances_controller.rb b/app/controllers/admin/appearances_controller.rb
new file mode 100644
index 00000000000..26cf74e4849
--- /dev/null
+++ b/app/controllers/admin/appearances_controller.rb
@@ -0,0 +1,57 @@
+class Admin::AppearancesController < Admin::ApplicationController
+  before_action :set_appearance, except: :create
+
+  def show
+  end
+
+  def preview
+  end
+
+  def create
+    @appearance = Appearance.new(appearance_params)
+
+    if @appearance.save
+      redirect_to admin_appearances_path, notice: 'Appearance was successfully created.'
+    else
+      render action: 'show'
+    end
+  end
+
+  def update
+    if @appearance.update(appearance_params)
+      redirect_to admin_appearances_path, notice: 'Appearance was successfully updated.'
+    else
+      render action: 'show'
+    end
+  end
+
+  def logo
+    @appearance.remove_logo!
+
+    @appearance.save
+
+    redirect_to admin_appearances_path, notice: 'Logo was succesfully removed.'
+  end
+
+  def header_logos
+    @appearance.remove_header_logo!
+    @appearance.save
+
+    redirect_to admin_appearances_path, notice: 'Header logo was succesfully removed.'
+  end
+
+  private
+
+  # Use callbacks to share common setup or constraints between actions.
+  def set_appearance
+    @appearance = Appearance.last || Appearance.new
+  end
+
+  # Only allow a trusted parameter "white list" through.
+  def appearance_params
+    params.require(:appearance).permit(
+      :title, :description, :logo, :logo_cache, :header_logo, :header_logo_cache,
+      :updated_by
+    )
+  end
+end
diff --git a/app/controllers/uploads_controller.rb b/app/controllers/uploads_controller.rb
index 868b05929d7..509f4f412ca 100644
--- a/app/controllers/uploads_controller.rb
+++ b/app/controllers/uploads_controller.rb
@@ -55,14 +55,15 @@ class UploadsController < ApplicationController
       "user"    => User,
       "project" => Project,
       "note"    => Note,
-      "group"   => Group
+      "group"   => Group,
+      "appearance" => Appearance
     }
 
     upload_models[params[:model]]
   end
 
   def upload_mount
-    upload_mounts = %w(avatar attachment file)
+    upload_mounts = %w(avatar attachment file logo header_logo)
 
     if upload_mounts.include?(params[:mounted_as])
       params[:mounted_as]