Setup Phabricator import

This sets up all the basics for importing Phabricator tasks into
GitLab issues.

To import all tasks from a Phabricator instance into GitLab, we'll
import all of them into a new project that will have its repository
disabled.

The import is hooked into a regular ProjectImport setup, but similar
to the GitHub parallel importer takes care of all the imports itself.

In this iteration, we're importing each page of tasks in a separate
sidekiq job.

The first thing we do when requesting a new page of tasks is schedule
the next page to be imported. But to avoid deadlocks, we only allow a
single job per worker type to run at the same time.

For now we're only importing basic Issue information, this should be
extended to richer information.

1 files changed, 35 insertions, 0 deletions

diff --git a/app/controllers/import/phabricator_controller.rb b/app/controllers/import/phabricator_controller.rb
new file mode 100644
index 00000000000..d1c04817689
--- /dev/null
+++ b/app/controllers/import/phabricator_controller.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class Import::PhabricatorController < Import::BaseController
+  include ImportHelper
+
+  before_action :verify_import_enabled
+
+  def new
+  end
+
+  def create
+    @project = Gitlab::PhabricatorImport::ProjectCreator
+                 .new(current_user, import_params).execute
+
+    if @project&.persisted?
+      redirect_to @project
+    else
+      @name = params[:name]
+      @path = params[:path]
+      @errors = @project&.errors&.full_messages || [_("Invalid import params")]
+
+      render :new
+    end
+  end
+
+  def verify_import_enabled
+    render_404 unless phabricator_import_enabled?
+  end
+
+  private
+
+  def import_params
+    params.permit(:path, :phabricator_server_url, :api_token, :name, :namespace_id)
+  end
+end