Added fork API paremeter for a specific namespace

Browser interface allows forking to an owned grup.
This commit brings API up to speed by providing optional namespace
parameter to fork API. This allows forking to users and groups under
forker's control using their id or unique name.

Fixes #21591

1 files changed, 14 insertions, 2 deletions

diff --git a/lib/api/projects.rb b/lib/api/projects.rb
index a1fd598414a..d35ec73c8c1 100644
--- a/lib/api/projects.rb
+++ b/lib/api/projects.rb
@@ -189,16 +189,28 @@ module API
         end
       end
 
-      # Fork new project for the current user.
+      # Fork new project for the current user or provided namespace.
       #
       # Parameters:
       #   id (required) - The ID of a project
+      #   namespace (optional) - The ID or name of the namespace that the project will be forked into.
       # Example Request
       #   POST /projects/fork/:id
       post 'fork/:id' do
+        attrs = {}
+        namespace_id = params[:namespace]
+        if namespace_id.present?
+          namespace = Namespace.find_by(id: namespace_id) || Namespace.find_by_path_or_name(namespace_id)
+          if namespace.nil?
+            not_found!('Target Namespace')
+          end
+          authorize! :create_projects, namespace
+          attrs[:namespace] = namespace
+        end
         @forked_project =
           ::Projects::ForkService.new(user_project,
-                                      current_user).execute
+                                      current_user,
+                                      attrs).execute
         if @forked_project.errors.any?
           conflict!(@forked_project.errors.messages)
         else