1/*  Part of SWISH
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@cs.vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (C): 2017, VU University Amsterdam
    7			 CWI Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   32    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(swish_authenticate,
   37          [ authenticate/2,                     % +Request, -Authentity
   38            user_property/2                     % +Authentity, ?Property
   39          ]).   40:- use_module(library(http/http_wrapper)).   41:- use_module(library(debug)).   42:- use_module(library(broadcast)).   43
   44:- use_module(config).

 authenticate(+Request, -Identity:dict) is det

Establish the identity behind the HTTP Request. There are two scenarios.

• The entire server is protected using HTTP authentication. In this case this predicate may throw an HTTP challenge or a forbidden exception.
• The server allows for mixed anonymous and logged in usage. Login may use HTTP or federated login (oauth2).

throws

- http_reply(_) HTTP authentication and permission exceptions if config-available/auth_http_always.pl is enabled.

   68authenticate(Request, Auth) :-
   69    http_peer(Request, Peer),
   70    http_auth(Request, HTTPAuth),
   71    profile_auth(Request, ProfileAuth),
   72    Auth2 = HTTPAuth.put(ProfileAuth).put(peer, Peer),
   73    identity(Request, Auth2, Auth),
   74    debug(authenticate, 'Identity: ~p', [Auth]).
   75
   76:- multifile
   77    swish_config:user_info/3,
   78    swish_config:authenticate/2,
   79    swish_config:user_profile/2.   80
   81http_auth(Request, Auth) :-
   82    (   swish_config:authenticate(Request, User)   % throws http_reply(_)
   83    ->  true
   84    ;   swish_config:user_info(Request, local, UserInfo),
   85        User = UserInfo.get(user)
   86    ),
   87    !,
   88    Auth = auth{user:User, identity_provider:local, external_identity:User}.
   89http_auth(_Request, auth{}).
   90
   91profile_auth(Request, Auth) :-
   92    swish_config:user_profile(Request, Profile),
   93    Pattern = _{ identity_provider: _,
   94                 external_identity: _,
   95                 profile_id:_},
   96    Pattern :< Profile,
   97    Auth = auth{}.put(Pattern).
   98profile_auth(_, auth{}).
   99
  100identity(Request, Auth0, Auth) :-
  101    _{identity_provider:Provider, external_identity:ExtID} :< Auth0,
  102    !,
  103    (   swish_config:user_info(Request, Provider, UserInfo),
  104        is_dict(UserInfo, Tag),
  105        (   var(Tag)
  106        ->  Tag = user_info
  107        ;   true
  108        )
  109    ->  true
  110    ;   UserInfo = user_info{}
  111    ),
  112    atomic_list_concat([Provider,ExtID], :, Identity),
  113    Auth = Auth0.put(_{identity:Identity, user_info:UserInfo}).
  114identity(_, Auth, Auth).

 user_property(+Identity, ?Property) is nondet

True when Identity has Property. Defined properties are:

peer(Atom)

Remote IP address

identity(Atom)

Identity as provided by some identity provider

identity_provider(Atom)

Subsystem that identified the user

external_identity(Atom)

Identity as provided by the identity_provider

profile_id(Atom)

Identifier of the profile we have on this user.

login(Atom)

Same as identity_provider(Atom)

name(Atom)

Name associated with the identity

email(Atom)

Email associated with the identity

  138user_property(Identity, Property) :-
  139    current_user_property(Property, How),
  140    user_property_impl(Property, How, Identity).
  141
  142user_property_impl(Property, dict, Identity) :- !,
  143    Property =.. [Name,Value],
  144    Value = Identity.get(Name).
  145user_property_impl(Property, broadcast, Identity) :-
  146    broadcast_request(identity_property(Identity, Property)).
  147user_property_impl(login(By), _, Identity) :-
  148    By = Identity.get(identity_provider).
  149
  150
  151current_user_property(peer(_Atom),                dict).
  152current_user_property(identity(_Atom),            dict).
  153current_user_property(external_identity(_String), dict).
  154current_user_property(identity_provider(_Atom),   dict).
  155current_user_property(profile_id(_Atom),          dict).
  156current_user_property(avatar(_String),            dict).
  157
  158current_user_property(login(_IdProvider),         derived).
  159current_user_property(name(_Name),                broadcast).
  160current_user_property(email(_Email),              broadcast).
  161
  162
  163		 /*******************************
  164		 *        PENGINE HOOKS		*
  165		 *******************************/

 pengines:authentication_hook(+Request, +Application, -User)

Is called from the /pengine/create request to establish the logged in user.

  172:- multifile pengines:authentication_hook/3.  173
  174pengines:authentication_hook(Request, _Application, User) :-
  175    authenticate(Request, User)