gitlab-org--gitlab-foss/app/controllers/projects/application_controller.rb

class Projects::ApplicationController < ApplicationController
  before_action :project
  before_action :repository
  layout 'project'

  def authenticate_user!
    # Restrict access to Projects area only
    # for non-signed users
    if !current_user
      id = params[:project_id] || params[:id]
      project_with_namespace = "#{params[:namespace_id]}/#{id}"
      @project = Project.find_with_namespace(project_with_namespace)

      return if @project && @project.public?
    end

    super
  end

  def require_branch_head
    unless @repository.branch_names.include?(@ref)
      redirect_to(
        namespace_project_tree_path(@project.namespace, @project, @ref),
        notice: "This action is not allowed unless you are on a branch"
      )
    end
  end

  private

  def apply_diff_view_cookie!
    view = params[:view] || cookies[:diff_view]
    cookies.permanent[:diff_view] = params[:view] = view if view
  end

  def builds_enabled
    return render_404 unless @project.builds_enabled?
  end
end