user_profile.pl -- User Profile Management

This module implements user profile management, in particular for managing authentication and authorization for HTTP servers. It mainly defines the interface that can be used within an HTTP application.

The actual storage is left to a plugin providing the backend implementation. Backend choices may depend on integration needs with other services, scale of the site (number of users), distribution, ease of installation.

The typical setup sequence is

:- use_module(library(http/user_profile)).
:- use_module(library(http/impl/profile_prolog)).
:- set_setting(user_profile:backend, impl_profile_prolog).

:- multifile
        user_profile:attribute/3.

user_profile:attribute_type(name, string, []).
...

 profile_open_db(+Options) is det

Open the profile database. Must be called before any of the other profile API predicates. Options depend on the used backend.

 profile_create(?ProfileID, +Attributes) is det

Create a new user profile with the given initial attributes.

Arguments:

Attributes

- is a list of Name(Value) terms.

 profile_canonical_value(+Attribute, +ValueIn, -Value) is det

True when Value is the canonical value for Attribute that satisfies the type constraint for Attribute.

Errors

- type_error(Type, ValueIn) if the type is wrong

- existence_error(profile_attribute, Attribute) if the attribute is unknown.

 current_profile(?ProfileID) is nondet

True when ProfileID is a currently known user profile.

 current_profile(?ProfileID, -Attributes:dict) is nondet

True when ProfileID is a currently known user profile with the given attributes.

 profile_property(?ProfileID, ?Property:compound) is nondet

True when the user with ProfileID has Property. Property is a term Name(Value).

 set_profile(+ProfileID, +Attribute) is det

 set_profile(+ProfileID, +Attribute, -Modified) is det

Set an attribute of the profile.

Arguments:

Attribute	- is a term Name(Value)
Modified	- is unified with a boolean, indicating whether or not the value was modified.

 profile_remove(+ProfileID) is det

Completely destroy a profile.

 profile_remove(+ProfileID, +Attribute) is det

Remove an attribute from a profile.

 profile_add_session(+ProfileID, +SessionID, +Options) is det

Associate a profile with a session (login). Options defined are:

timeout(+Seconds)

Max idle time for the session.

persistent(+Boolean)

If true, store the session association persistently, such that a server restart maintains the login.

 profile_refresh_session(+ProfileID, +SessionID) is det

Update the last access time for the indicated session.

 profile_remove_session(+ProfileID, +SessionID) is det

Remove the association of a profile with a session (logout).

 profile_session(?ProfileID, ?SessionID) is nondet

True when ProfileID is associated (logged in) with SessionID.

 error:has_type(+Type, +Value) is semidet[multifile]

True if Value satisfies Type. This implementation extends the type logic defined in library(error) with some types that commonly apply to user profiles.

To be done

- : extend with e.g., zip, country, phone, date

 attribute(?Attribute, ?Type, ?Options) is nondet[multifile]

Multifile hook that defines that the profile attribute Attribute must have the type Type. Type are types as defined by must_be/2 from library(error). Options defined are:

access(+Access)

Defines whether or not the user can update the attribute value. Access is one of rw (default) or ro.

hidden(+Boolean)

If true, the attribute is not displayed in the user profile.

default(+Value)

Assumed default if the value is unknown.