Filter hook for checking registration information

[thefreefood]

I would like to prevent users from registering to my site if their email address is not from a specific domain. For this purpose and other similar types of restrictions on registration, it would be convenient to add a filter hook to wp_register.php that passes an array with username, password, and email address information and returns an errors array that is incorporated into $errors before the user is registered. Then, if a filter returns NULL, registration would proceed. This seems like it would be broadly useful.

[markjaquith]

User Registration Email filter and Error Filter

[markjaquith]

Agreed on the usefulness of this.

I whipped up a quick patch. The e-mail is passed through user_registration_email filter. The $errors array is passed through registration_errors filter.

So something like:

function user_emails_on_my_domain($email) {
	if ( strpos($email, '@mydomain.com') === false ) { // obviously use a better check than this!
		add_filter('registration_errors', create_function('$errors=array()', '$errors[\'user_email\'] = \'<strong>ERROR</strong>: This email does not end in "@domain.com"\'; return $errors;'));
	}
	return $email;
}

add_filter('user_registration_email', 'user_emails_on_my_domain');

Untested, but you get the idea. Going to have to be a 2.1 milestone.

[matt]

(In [4589]) Some new hooks on registration, fixes #2541