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POHow can a Jersey InjectableProvider depend on the AbstractMethod of the resource?
 

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  1. POHow can a Jersey InjectableProvider depend on the AbstractMethod of the resource?
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    <p>I have a <code>ResourceFilterFactory</code> that returns a <code>ContainerRequestFilter</code> if an annotation is present on the <code>AbstractMethod</code>.</p> <p>The filter reads a cookie or API key and checks that it is still valid, and sets a property on the request. The check is expensive, so I only want it to occur when the annotation is present.</p> <p>I want to inject the resulting object into my resource, but it seems that injection happens before <code>ResourceFilterFactory</code> filters are applied. If I add the filter to the <code>ResourceConfig</code> as a <code>PROPERTY_CONTAINER_REQUEST_FILTERS</code>, then it happens before the injection, but it does not have access to the <code>AbstractMethod</code>.</p> <p>How do I bridge the gap, so that the filter is applied and the field is injected only if the method has the annotation?</p> <p>My code looks something like this. <code>AuthFilter</code> is called after <code>UserIdProvider</code>, so <code>c.getProperties().get(USER_ID_PROPERTY)</code> is always <code>null</code>.</p> <pre><code>public class AuthFilter implements ContainerRequestFilter { public ContainerRequest filter(ContainerRequest request) { Integer userId = …; // expensive lookup request.getProperties().set(USER_ID_PROPERTY, userId); return request; } } public class AuthFilterFactory implements ResourceFilterFactory { // … public List&lt;ResourceFilter&gt; create(AbstractMethod am) { if (am.isAnnotationPresent(RequireAuth.class) || am.getResource().isAnnotationPresent(RequireAuth.class)) { return Collections.singletonList(new ResourceFilter() { public ContainerRequestFilter getRequestFilter() { return authFilter; } }); } else { return null } } } </code></pre> <p>InjectableProvider:</p> <pre><code>@Provider public class UserIdProvider implements InjectableProvider&lt;UserId, Parameter&gt; { public ComponentScope getScope() { return ComponentScope.PerRequest; } public Injectable&lt;? extends Object&gt; getInjectable(ComponentContext ic, UserId a, final Parameter t) { return new AbstractHttpContextInjectable&lt;Integer&gt;() { public Integer getValue(HttpContext c) { return (Integer) c.getProperties().get(USER_ID_PROPERTY); } } } } </code></pre> <p>Resource:</p> <pre><code>@Path("/user") public class UserResource { @UserId Integer userId; // userId should only be set on this method @GET @RequireAuth public UserDetails get() { // … } // the auth filter should not be called for this method @POST @Path("/login") public String login() { // … } } </code></pre>
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    1. COSo you need a filter that runs after the request has been matched, but before the matched resources have been instantiated. This isn't possible with Jersey 1.x afaik, not sure about Jersey 2.x
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