Add missing ldap_group_links controller

app/controllers/groups/ldap_group_links_controller.rb

+class Groups::LdapGroupLinksController < ApplicationController
+  before_action :group
+  before_action :authorize_admin_group!
+
+  def create
+    ldap_group_link = @group.ldap_group_links.build(ldap_group_link_params)
+    if ldap_group_link.save
+      redirect_to :back, notice: 'New LDAP link saved'
+    else
+      redirect_to :back, alert: 'Could not create new LDAP link'
+    end
+  end
+
+  def destroy
+    @group.ldap_group_links.where(id: params[:id]).destroy_all
+    redirect_to :back, notice: 'LDAP link removed'
+  end
+
+  private
+
+  def group
+    @group ||= Group.find_by(path: params[:group_id])
+  end
+
+  def authorize_admin_group!
+    render_404 unless can?(current_user, :manage_group, group)
+  end
+
+  def ldap_group_link_params
+    params.require(:ldap_group_link).permit(:cn, :group_access)
+  end
+end
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