Hi,
If you only want to override the AuthenticationStrategy, you can do
something like that within your ShiroWebModule:
protected void configureShiroWeb()
{
[...]
bind( ModularRealmAuthenticator.class );
bind( Authenticator.class ).to(
ModularRealmAuthenticator.class );
bind( AuthenticationStrategy.class ).to(
<your_custom_strategy> );
}
Because there is no direct dependency to the AuthenticationStrategy from the
SecurityManager or the other shiro objects bound to Guice, only binding it
will do nothing as nobody depends on it. So you must bind all the necessary
objects to obtain a connected dependency graph (which generally starts from
the SecurityManager or the Environment), for the AuthenticationStrategy it
is simply:
SecutityManager -> Authenticator -> AuthenticationStrategy
And if in your graph, one of the "intermediary" node (like the Authenticator
in the example above) is a class of your own (and thus will not be heard by
the TypeListener), then you don't need the type listener just inject all
needed shiro objects with @Inject they'll be available for injection if you
bind your class within the private ShiroWebModule.
Another subtlety to be carefull about: if you're familiar to Guice you may
wonder why the binding to the Authenticator is done like:
bind( ModularRealmAuthenticator.class );
bind( Authenticator.class ).to(
ModularRealmAuthenticator.class );
instead of just:
bind( Authenticator.class ).to(
ModularRealmAuthenticator.class );
Because when omitting the first line Guice will have to create a Just In
Time binding for the ModularRealmAuthenticator class (as the second line is
in fact just a link between injection keys, it does not define a concrete
binding). The JIT binding created will not be considered part of the
ShiroModule, and because this module is private, the type listener won't
listen on ModularRealmAuthenticator and thus nothing will be injected on its
instances.
So to sum-up, recommandations could be:
* Ensure to have a connected dependency graph.
* No JIT bindings.
Regards.
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