如果ResourceFilterFactory
注释ContainerRequestFilter
存在于AbstractMethod
.
过滤器读取 cookie 或 API 密钥并检查它是否仍然有效,并在请求上设置一个属性。检查是昂贵的,所以我只希望它在注释存在时发生。
我想将生成的对象注入到我的资源中,但似乎注入发生在ResourceFilterFactory
应用过滤器之前。如果我将过滤器ResourceConfig
作为.PROPERTY_CONTAINER_REQUEST_FILTERS
AbstractMethod
如何弥合差距,以便仅在方法具有注释时应用过滤器并注入字段?
我的代码看起来像这样。AuthFilter
被调用后UserIdProvider
,c.getProperties().get(USER_ID_PROPERTY)
总是如此null
。
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<ResourceFilter> 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
}
}
}
InjectableProvider:
@Provider
public class UserIdProvider implements InjectableProvider<UserId, Parameter> {
public ComponentScope getScope() {
return ComponentScope.PerRequest;
}
public Injectable<? extends Object> getInjectable(ComponentContext ic, UserId a, final Parameter t) {
return new AbstractHttpContextInjectable<Integer>() {
public Integer getValue(HttpContext c) {
return (Integer) c.getProperties().get(USER_ID_PROPERTY);
}
}
}
}
资源:
@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() {
// …
}
}