Convert authentication plug-in system to an extension point

[Nicklas Nordborg]

Instead of specifying a class name (and jar path if patched with #1575) the base.config can simply reference the id of an extensions to that extension point. If only a single extension exists, that extension should be used automatically. The change also mean that the authenticator interface should be changed.

[Nicklas Nordborg]

​http://www.mail-archive.com/basedb-devel@lists.sourceforge.net/msg00445.html

[Nicklas Nordborg]

(In [6423]) References #1599: Convert authentication plug-in system to an extension point

Created extension point for authentication. Extensions should implement the AuthenticationAction interface. The old Authenticator interface is deprecated but it should not be difficult to convert existing authenticators to the new system. Login information is now sent using LoginRequest object via the AuthenticationContext object.

[Nicklas Nordborg]

(In [6424]) References #1599: Convert authentication plug-in system to an extension point

Avoid calling deprecated methods.

Added OldAuthenticationWrapperFactory for backwards compatibility with old external authentication implementations.

[Nicklas Nordborg]

(In [6425]) References #1599: Convert authentication plug-in system to an extension point

Re-designed the authentication process a bit to make it possible to return more information about the authentication back to the core.

Authentication managers should now return a AutheniticatedUser object instead of AuthenticationInformation (which is deprecated).

Introduced AuthenticationMethod which is stored in the SessionControl for potential use by client applications to allow/disallow user actions based on the authentication method used.

Introduced ExtraUserInformation which also allow extended properties to be synchronized with user accounts.

[Nicklas Nordborg]

(In [6426]) References #1599: Convert authentication plug-in system to an extension point

Adding extension point for customizing the login form.

[Nicklas Nordborg]

(In [6427]) References #1599: Convert authentication plug-in system to an extension point

Adding some more capabilities to the AuthenticationContext, SessionControl and LoginRequest that makes it possible to query for a list of users and internal login based on the user id (saves a query to the database).

[Nicklas Nordborg]

(In [6428]) References #1599: Convert authentication plug-in system to an extension point

Added a boolean flag to extended-properties.xml file to make it possible to mark some properties as editable by an administrator only.

[Nicklas Nordborg]

(In [6429]) References #1599: Convert authentication plug-in system to an extension point

Updated documentation.

[Nicklas Nordborg]

(In [6437]) References #1599: Convert authentication plug-in system to an extension point

Need to override login method in PluginSessionControl to prevent a plug-in from swithcing to another user.