in lib/omniauth/strategies/ldap.rb [61:69]
def filter(adaptor)
if adaptor.filter and !adaptor.filter.empty?
username = Net::LDAP::Filter.escape(@options[:name_proc].call(request['username']))
Net::LDAP::Filter.construct(adaptor.filter % { username: username })
else
Net::LDAP::Filter.equals(adaptor.uid, @options[:name_proc].call(request['username']))
end
end