在Jersey 1.18.1請求過濾器中獲取資源注釋

Question

我正在實現一個用戶授權模塊，該模塊將使用（新）注釋應用於資源方法。
為此，我創建了一個Jersey（請求）過濾器，在其中需要獲取批注以允許/禁止資源操作。

我正在將Dropwizard 0.7.1與Jersey 1.18.1一起使用

資源類：

@Path("/v1/users/registration")
@Produces(MediaType.APPLICATION_JSON)
@Api(value = "/users/registration")
public class UserRegistrationResource {
    @POST
    @AuthorizedFor(Realm.SOCIAL) // The custom annotation class
    public SessionModel register(
            @Valid
            @ApiParam(value = "New user to be registered", required = true)
            NewUser user) throws Exception {

        // Some logic
    ...
    }
}

過濾器類：

@Provider
public class AuthorizationFilter implements ContainerRequestFilter {

    @Context
    AbstractMethod method;

    @Override
    public ContainerRequest filter(ContainerRequest request) {

    // At this point, the method parameter is null :(

    Realm realm = null;
        User user = Context.get(Session.class).getUser();
        for (Annotation annotation : method.getAnnotations()) {
            if (AuthorizedFor.class == annotation.annotationType()) {
                realm = ((AuthorizedFor) annotation).value();
            }
        }
        if (realm != null) {
            for (Realm userRealm : user.getRole().getAllowedRealms()) {
                if (userRealm.equals(realm)) {
                    return request;
                }
            }
        }
        throw new ApiException(ResponseCode.UNAUTHORIZED);
    }
}

提供者類：

@Provider
public class AbstractMethodProvider extends AbstractHttpContextInjectable<AbstractMethod> implements InjectableProvider<Context, Parameter> {

    @Override
    public Injectable<AbstractMethod> getInjectable(ComponentContext ic, Context context, Parameter parameter) {
        if (parameter.getParameterType() == AbstractMethod.class) {
            return this;
        }
        return null;
    }

    @Override
    public ComponentScope getScope() {
        return ComponentScope.PerRequest;
    }

    @Override
    public AbstractMethod getValue(HttpContext context) {
        return context.getUriInfo().getMatchedMethod();
    }
}

過濾器和提供程序初始化代碼：

environment.jersey().getResourceConfig().getContainerRequestFilters().add(new AuthorizationFilter());
environment.jersey().register(new AbstractMethodProvider());

我也嘗試在過濾器中注入HttpContext。 它不是null，但是getUriInfo（）。getMatchedMethod（）是null。
是否有更好的方法在Jersey請求過濾器中獲取資源方法注釋？

Answer 1

您可以實現ResourceFilterFactory來獲取AbstractMethod。

public class AuthorizationFilterFactory implements ResourceFilterFactory {

    @Override
    public List<ResourceFilter> create(AbstractMethod abstractMethod) {
        return Arrays.asList(this.createAuthorizationFilter(abstractMethod));
    }

    private ResourceFilter createAuthorizationFilter(final AbstractMethod abstractMethod) {
        return new ResourceFilter() {
            @Override
            public ContainerRequestFilter getRequestFilter() {
                return new AuthorizationFilter(abstractMethod);
            }

            @Override
            public ContainerResponseFilter getResponseFilter() {
                return null;
            }
        };
    }
}

因此，您的AuthorizationFilter將如下所示：

@Provider
public class AuthorizationFilter implements ContainerRequestFilter {

    private final AbstractMethod method;

    public AuthorizationFilter(AbstractMethod method) {
        this.method = method;
    }

    @Override
    public ContainerRequest filter(ContainerRequest request) {
        Realm realm = null;
        User user = Context.get(Session.class).getUser();
        for (Annotation annotation : method.getAnnotations()) {
            if (AuthorizedFor.class == annotation.annotationType()) {
                realm = ((AuthorizedFor) annotation).value();
            }
        }
        if (realm != null) {
            for (Realm userRealm : user.getRole().getAllowedRealms()) {
                if (userRealm.equals(realm)) {
                    return request;
                }
            }
        }
        throw new ApiException(ResponseCode.UNAUTHORIZED);
    }
}

要注冊您的工廠：

environment.jersey().getResourceConfig().getResourceFilterFactories().add(new AuthorizationFilterFactory());