细粒度的认证与的Restlet

Question

我要揭露使用的Restlet具有细粒度认证的资源。我ServerResource应该通过GET只对经过验证的成员（使用基本身份验证）accessable。然而，使用POST请求应可也没有任何身份验证呼叫者。

在为了clearify： 的http：//路径/ MYAPP /用户不允许任何人利用POST注册，但只有注册会员应该可以GET所有用户的列表。

我很遗憾没有多少成的Restlet，我只能用粗糙的身份验证整个Restlets或Routers找到例子。

那么，如何使资源可选的认证和检查他们在每个方法的水平？

提前感谢！

Answer 1

要做好的Restlet 2.0（我假设你使用的是2.0，因为你提到ServerResource）基本身份验证，则需要使用ChallengeAuthenticator。如果这个配置了optional = true则认证将只如果调用ChallengeAuthenticator.challenge()请求。

您可以创建与authenticate()方法您的应用程序，并调用这个只要你需要访问资源要保护：

应用：

package example;

import org.restlet.*;
import org.restlet.data.ChallengeScheme;
import org.restlet.routing.Router;
import org.restlet.security.*;

public class ExampleApp extends Application {

    private ChallengeAuthenticator authenticatior;

    private ChallengeAuthenticator createAuthenticator() {
        Context context = getContext();
        boolean optional = true;
        ChallengeScheme challengeScheme = ChallengeScheme.HTTP_BASIC;
        String realm = "Example site";

        // MapVerifier isn't very secure; see docs for alternatives
        MapVerifier verifier = new MapVerifier();
        verifier.getLocalSecrets().put("user", "password".toCharArray());

        ChallengeAuthenticator auth = new ChallengeAuthenticator(context, optional, challengeScheme, realm, verifier) {
            @Override
            protected boolean authenticate(Request request, Response response) {
                if (request.getChallengeResponse() == null) {
                    return false;
                } else {
                    return super.authenticate(request, response);
                }
            }
        };

        return auth;
    }

    @Override
    public Restlet createInboundRoot() {
        this.authenticatior = createAuthenticator();

        Router router = new Router();
        router.attach("/user", UserResource.class);

        authenticatior.setNext(router);
        return authenticatior;
    }

    public boolean authenticate(Request request, Response response) {
        if (!request.getClientInfo().isAuthenticated()) {
            authenticatior.challenge(response, false);
            return false;
        }
        return true;
    }

}

资源：

package example;

import org.restlet.data.MediaType;
import org.restlet.representation.EmptyRepresentation;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.resource.ServerResource;

public class UserResource extends ServerResource {

    @Override
    public Representation get() {
        ExampleApp app = (ExampleApp) getApplication();
        if (!app.authenticate(getRequest(), getResponse())) {
            // Not authenticated
            return new EmptyRepresentation();
        }

        // Generate list of users
        // ...
    }     

    @Override
    public Representation post(Representation entity) {
        // Handle post
        // ...
    }

}

Answer 2

我目前正在使用的Restlet v2.0.10。

与ChallengeAuthenticator.isOptional()的问题是，它是全有或全无。由@ sea36上面提供的答案的替代是重写ChallengeAuthenticator.beforeHandle()要么执行认证或跳过它根据请求的方法。例如，该资源将在下文仅当使用GET方法要求身份验证。

应用：

package example;

import org.restlet.*;
import org.restlet.data.ChallengeScheme;
import org.restlet.routing.Router;
import org.restlet.security.ChallengeAuthenticator;
import org.restlet.security.MapVerifier;

public class ExampleApp extends Application {

    private ChallengeAuthenticator createAuthenticator() {
        Context context = getContext();
        ChallengeScheme challengeScheme = ChallengeScheme.HTTP_BASIC;
        String realm = "Example site";

        // MapVerifier isn't very secure; see docs for alternatives
        MapVerifier verifier = new MapVerifier();
        verifier.getLocalSecrets().put("user", "password".toCharArray());

        ChallengeAuthenticator authOnGet = new ChallengeAuthenticator(context, challengeScheme, realm) {
            @Override
            protected int beforeHandle(Request request, Response response) {
                if (request.getMethod() == Method.GET)
                    return super.beforeHandle(request, response);

                response.setStatus(Status.SUCCESS_OK);
                return CONTINUE;
            }
        };

        return authOnGet;
    }

    @Override
    public Restlet createInboundRoot() {
        ChallengeAuthenticator userResourceWithAuth = createAuthenticator();
        userResourceWithAuth.setNext(UserResource.class);

        Router router = new Router();
        router.attach("/user", userResourceWithAuth);

        return router;
    }

}

资源：

package example;

import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.representation.Representation;
import org.restlet.resource.ServerResource;

public class UserResource extends ServerResource {

    @Get
    public Representation listUsers() {
        // retrieve list of users and generate response
        // ...
    }     

    @Post
    public void register(Representation entity) {
        // handle post
        // ...
    }
}

请注意，这个例子适用于GET只认证是由路由器处理的UserResource而不是其他资源的政策。