Add project export API implementation

app/models/project.rb

@@ -1560,7 +1560,7 @@ class Project < ActiveRecord::Base
   def export_path
     return nil unless namespace.present? || hashed_storage?(:repository)
 
-    File.join(Gitlab::ImportExport.storage_path, disk_path)
+    Gitlab::ImportExport::Shared.new(self).archive_path
   end
 
   def export_project_path
@@ -1578,8 +1578,7 @@ class Project < ActiveRecord::Base
   end
 
   def export_in_progress?
-    shared = Gitlab::ImportExport::Shared.new(relative_path: File.join(disk_path, 'work'))
-    File.directory?(shared.export_path)
+    Gitlab::ImportExport::Shared.new(self).active_export_count > 0
   end
 
   def remove_exports

app/services/projects/import_export/export_service.rb

@@ -2,7 +2,7 @@ module Projects
   module ImportExport
     class ExportService < BaseService
       def execute(_options = {})
-        @shared = Gitlab::ImportExport::Shared.new(relative_path: File.join(project.disk_path, 'work'))
+        @shared = Gitlab::ImportExport::Shared.new(project)
         save_all
       end
 

lib/api/api.rb

@@ -138,6 +138,7 @@ module API
     mount ::API::PagesDomains
     mount ::API::Pipelines
     mount ::API::PipelineSchedules
+    mount ::API::ProjectExport
     mount ::API::ProjectImport
     mount ::API::ProjectHooks
     mount ::API::Projects

lib/api/project_export.rb

+module API
+  class ProjectExport < Grape::API
+    before do
+      not_found! unless Gitlab::CurrentSettings.current_application_settings.project_export_enabled?
+      authorize_admin_project
+    end
+
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
+    resource :projects, requirements: { id: %r{[^/]+} } do
+      desc 'Get export status' do
+        success Entities::ProjectExportStatus
+      end
+      get ':id/export' do
+        present user_project, with: Entities::ProjectExportStatus
+      end
+
+      desc 'Download export'
+      get ':id/export/download' do
+        path = user_project.export_project_path
+
+        render_api_error!('404 Not found or has expired', 404) unless path
+
+        present_file!(path, File.basename(path), 'application/gzip')
+      end
+
+      desc 'Start export'
+      post ':id/export' do
+        user_project.add_export_job(current_user: current_user)
+
+        accepted!
+      end
+    end
+  end
+end

lib/gitlab/import_export/importer.rb

@@ -9,7 +9,7 @@ module Gitlab
         @archive_file = project.import_source
         @current_user = project.creator
         @project = project
-        @shared = Gitlab::ImportExport::Shared.new(relative_path: path_with_namespace)
+        @shared = Gitlab::ImportExport::Shared.new(project)
       end
 
       def execute

lib/gitlab/import_export/shared.rb

 module Gitlab
   module ImportExport
     class Shared
-      attr_reader :errors, :opts
+      attr_reader :errors, :project
 
-      def initialize(opts)
-        @opts = opts
+      def initialize(project)
+        @project = project
         @errors = []
       end
 
+      def active_export_count
+        Dir[File.join(archive_path, '*')].count { |name| File.directory?(name) }
+      end
+
       def export_path
         @export_path ||= Gitlab::ImportExport.export_path(relative_path: relative_path)
       end
@@ -31,11 +35,15 @@ module Gitlab
       private
 
       def relative_path
-        File.join(opts[:relative_path], SecureRandom.hex)
+        File.join(relative_archive_path, SecureRandom.hex)
       end
 
       def relative_archive_path
-        File.join(opts[:relative_path], '..')
+        if @project.is_a?(Project)
+          @project.disk_path
+        else
+          @project[:relative_path]
+        end
       end
 
       def error_out(message, caller)