Grails filters with static resources?

I'm converting an old school Java filter to a Grails filter. (The filter is recording access to particular static image.)

The problem is, I can't get it fire! Does Grails support filters in front of static resources?

class EmailImageFilters {
    def filters = {
        emailFilter(uri: '开发者_运维问答/images/**') {
            log.info "email filter ${new Date()}"
            before = {
                return true;
            }
        }
    } 
}

I am using the UIPerformance plugin, but it's not turned on in development mode.

Grails 1.3.5

I can get it to fire when:

emailFilter(controller: '*', action: '*') {

but I need it to be through static resources; e.g. /images

Suggestions?

Static resources aren't served by a controller, so Grails filters (which are wrappers for Spring controller interceptors) won't fire for requests for them. You need to register a servlet filter in web.xml to process static resources.

Create a class in src/java or src/groovy that implements javax.servlet.Filter, then run grails install-templates and edit src/templates/war/web.xml to register it, something like

<filter>
   <filter-name>myFilter</filter-name>
   <filter-class>com.mycompany.myapp.MyFilter</filter-class>
</filter>

<filter-mapping>
   <filter-name>myFilter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>

Change the value of url-pattern to be more specific if you don't want it to fire for all requests.