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## $Id$
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006 CERN.
##
## CDS Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## CDS Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#include "cdspage.wml" \
title="Access Control Engine API" \
navbar_name="hacking-webaccess" \
navtrail_previous_links="<a class=navtrail href=<WEBURL>/hacking/>Hacking CDS Invenio</a> &gt; <a class=navtrail href=<WEBURL>/hacking/webaccess/index.html>WebAccess Internals</a> " \
navbar_select="hacking-webaccess-engine-api"
<p>Version <: print generate_pretty_revision_date_string('$Id$'); :>
<pre>
CDS Invenio Access Control Engine can be called from within your Python programs
via both a regular Python API and CLI.
In addition the you get an explanation of the program flow.
Contents:
1. Regular API
2. Command Line Interface
3. Program Flow
4. External login methods
1. Regular API
Description:
There is not very much information in the database at the moment.
More can be added on demand.
Information on these will be added when time allows it.
Signature:
def acc_authorize_action(id_user, name_action, dict={}, **arguments):
""" Check if user is allowed to perform action
with given list of arguments.
Return (0, message) if authentication succeeds, (error_code, error_message) if it fails.
The arguments are as follows:
id_user - id of the user to be authorized in the database
name_action - the name of the action
arguments - dictionary with keyword=value pairs created automatically
by python on the extra arguments. these depend on the
given action. """
Examples:
>>> # import the functions from module
>>> # change this to your local settings...
>>> from invenio.access_control_engine import *
>>> # authorize user 109 for action WebSearch_search with collection="LHC"
>>> acc_authorize_action(109, 'cfgwebsearch', collection="LHC")
(0, "User authorized")
>>> # authorize user 109 for action WebSearch_search with collection="fail this"
>>> acc_authorize_action(109, 'cfgwebsearch', collection="fail this")
(8, "Error (8): Incorrect keyword given for specified action.")
>>> # authorize user 109 for action BibFormat_modify with format="htmlbrief"
>>> acc_authorize_action(109, 'cfgbibformat', format="htmlbrief")
(0, "User authorized")
2. Command Line Interface
Description:
The Command Line Interface uses the regular API of acc_authorize_action.
Signature:
authaction id_user name_action keyword1 value1 keyword2 value2 ...
""" See description from function acc_authorize_action.
id_user - id of user to be authorized
name_action - name of the action
keyword1 - first keyword like in the keyword=value pairs,
same rules for the following ones.
always one word.
value1 - value that belongs in a pair with the corresponding keyword,
same rules for the following ones.
add quotes if it is more that one word.
the keyword=value pairs are collected in a dictionary
"""
Examples:
These are the same ones as for the regular API:
$ authaction 109 cfgwebsearch collection LHC
0 - User authorized
$ authaction 109 cfgwebsearch collection 'fail this'
8 - Error (8): Incorrect keyword given for specified action.
$ authaction 109 cfgbibformat format htmlbrief
0 - User authorized
3. Program Flow
this is a quick explanation of the different tasks
performed by the authorization engine.
I. find information for the action
use admin API to find info.
II. see if user is a superadmin
query the database for connection between user and role superadmin.
-> authorize if yes
III. check if the user exists and find all of the users roles and create string with the ids
query the database and build string of ids
-> don't authorize if no roles
IV. try to authorize without arguments
action without arguments: query database
-> authorize if yes
action with optional arguments
-> authorize if yes
V. create list of keyword=value pairs to query the database
run through dictionary and create string for adding to database query
VI. find all table entries from the database
query the database for table entries
create list of the tuples and sort it
-> don't authorize if no entries
-> authorize if only 1 argument and result
VII. combine entries and try to satisfy authorization
dictionary with the arguments as keys, all values 0
run throught the list created in VI
if moving on to new authorization
check dictionary values
-> authorize if combination found
reset values to 0 if not found
set dictionary[keyword] to 1.
(countinue loop)
VIII. all the above failed
-> authorization failed
4. External login methods
If you want to call defined external loginmethods, it can be done by:
import invenio.external_authentication
example_method = invenio.external_authentication.example()
example_method.auth_user("testuser", "testpassword")
Example is here a class used as an example, which must contain the method
auth_user.
</pre>

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