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php-aselect

A-Select agent library in php

This code was originally written by Hans Zandbelt.

See example.php for an example of how to use the agent library. Note that library functions start with an "as_" prefix.

Configuration

All library function calls require a parameter array containing configuration data. Two entries are relevant:

  • client - containing client parameters:
    • app_id - A-Select application identifier to be used for this application
    • key - key to sign requests with (if signing is required)
  • server - containing server parameters (obtained from the A-select server administrator)
    • url - A-Select server URL
    • server_id - A-Select server identifier

if the authentication succeeded, as_process will return an array that looks like:

[uid] => john
[organization] => Example Organisation
[attributes] => Array
    (
        [urn:mace:dir:attribute-def:sn] => Array
            (
                [0] => Doe
            )

        [urn:mace:dir:attribute-def:mail] => Array
            (
                [0] => [email protected]
                [1] => [email protected]
            )

        [urn:mace:dir:attribute-def:givenName] => Array
            (
                [0] => John
            )

        [urn:mace:dir:attribute-def:uid] => Array
            (
                [0] => john
            )
    )

Caveats

Upon succesful authentication, i.e. as_process returns something different from NULL, a session variable should be set that avoids calling verify_credentials each time this file is accessed. This is dependant on the session management used by your application, i.e. use session_start and set an "authenticated" variable in $_SESSION

Also, your apploication should redirect to a "clean" URL to avoid unnecessary re-authentication when users reload the page.

Test

You can easily test the example script using a php 5.4 build-in web server by running the following command and pointing your browser to http://localhost:8080/example.php

$ php -S localhost:8080
PHP 5.4.17 Development Server started at Fri Jul 19 16:33:25 2013
Listening on http://localhost:8080
Document root is /path/to/php-aselect
Press Ctrl-C to quit.
[Fri Jul 19 16:33:30 2013] ::1:51099 [302]: /
[Fri Jul 19 16:33:35 2013] ::1:51102 [200]: /?rid=ffd5f592bd398c6ce812a1b3ec5340b6&a-select-server=sp.example.org&aselect_credentials=P/71M8qjygd3Pem8HFP/81ERDPECYrS9W1JxqEN1nSoH6vFuaLOc0wKIuvb5XhYgXn6sbFXHVdhoNqe6/Xjn-ZluJoFFIzV96fPPs20mnSCN5TFoyKaJMNkn6rVEepUtSxPDsjs/B1vphqVdHmWGaq62mi2wfi/W7FiW/floZUw_
[Fri Jul 19 16:33:58 2013] ::1:51106 [302]: /?request=logout

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