http_openid:openid

True if OpenID is a validated OpenID associated with the current session. The scenario for which this predicate is designed is to allow an HTTP handler that requires a valid login to use the transparent code below.

handler(Request) :-
      openid_user(Request, OpenID, []),
      ...

If the user is not yet logged on a sequence of redirects will follow:

Show a page for login (default: page /openid/login), predicate reply_openid_login/1)
By default, the OpenID login page is a form that is submitted to the verify, which calls openid_verify/2.
openid_verify/2 does the following:
- Find the OpenID claimed identity and server
- Associate to the OpenID server
- redirects to the OpenID server for validation
The OpenID server will redirect here with the authetication information. This is handled by openid_authenticate/4.

Options:

login_url(Login): (Local) URL of page to enter OpenID information. Default is the handler for openid_login_page/1

See also: - openid_authenticate/4 produces errors if login is invalid or cancelled.