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LightOpenID Quick Start

Sign-on with OpenID is a two step process:

  1. Step one is authentication with the provider:

    $openid = new LightOpenID('my-host.example.org');

$openid->identity = 'ID supplied by the user';

header('Location: ' . $openid->authUrl());

    The provider then sends various parameters via GET, one of which is openid_mode.

  2. Step two is verification:

    $openid = new LightOpenID('my-host.example.org');

if ($openid->mode) {
  echo $openid->validate() ? 'Logged in.' : 'Failed!';
}

Notes:

Change 'my-host.example.org' to your domain name. Do NOT use $_SERVER['HTTP_HOST'] for that, unless you know what you're doing.

Optionally, you can set $returnUrl and $realm (or $trustRoot, which is an alias). The default values for those are:

$openid->realm = (!empty($_SERVER['HTTPS']) ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'];
$openid->returnUrl = $openid->realm . $_SERVER['REQUEST_URI'];

If you don't know their meaning, refer to any OpenID tutorial, or specification.

Basic configuration options:

name description
identity Sets (or gets) the identity supplied by an user. Set it before calling authUrl(), and get after validate().
returnUrl Users will be redirected to this url after they complete authentication with their provider. Default: current url.
realm The realm user is signing into. Providers usually say "You are sgning into $realm". Must be in the same domain as returnUrl. Usually, this should be the host part of your site's url. And that's the default.
required and optional Attempts to fetch more information about an user. See Common AX attributes.
verify_peer When using https, attempts to verify peer's certificate. See CURLOPT_SSL_VERIFYPEER.
cainfo and capath When verify_peer is true, sets the CA info file and directory. See CURLOPT_SSL_CAINFO and CURLOPT_SSL_CAPATH.

AX and SREG extensions are supported:

To use them, specify $openid->required and/or $openid->optional before calling $openid->authUrl(). These are arrays, with values being AX schema paths (the 'path' part of the URL). For example:

$openid->required = array('namePerson/friendly', 'contact/email');
$openid->optional = array('namePerson/first');

Note that if the server supports only SREG or OpenID 1.1, these are automaticaly mapped to SREG names, so that user doesn't have to know anything about the server. To get the values, use $openid->getAttributes().

Common AX attributes

Here is a list of the more common AX attributes (from axschema.org):

Name Meaning
namePerson/friendly Alias/Username
contact/email Email
namePerson Full name
birthDate Birth date
person/gender Gender
contact/postalCode/home Postal code
contact/country/home Country
pref/language Language
pref/timezone Time zone

Note that even if you mark some field as required, there is no guarantee that you'll get any information from a provider. Not all providers support all of these attributes, and some don't support these extensions at all.

Google, for example, completely ignores optional parameters, and for the required ones, it supports, according to it's website:

  • namePerson/first (first name)
  • namePerson/last (last name)
  • contact/country/home
  • contact/email
  • pref/language