方法和用户的Restlet授权-RestletAuthorizationbyMethodANDUser

In fact, I think that you should leverage the role support of Restlet. In fact, Restlet provides two additional elements regarding security:

事实上,我认为你应该利用Restlet的角色支持。事实上,Restlet提供了两个有关安全性的附加元素:

• Verifier that actually authenticates the user based on provided credentials within the request

验证程序实际上根据请求中提供的凭据对用户进行身份验证

• Enroler that loads the roles of the authenticated user.

Enroler加载经过身份验证的用户的角色。

Here is a sample for a basic authentication:

以下是基本身份验证的示例:

@Override
public Restlet createInboundRoot() {
    Router router = (...)

    Verifier verify = new MyVerifier(...);
    Enroler enroler = new MyEnroler(...);

    ChallengeAuthenticator guard = new ChallengeAuthenticator(getContext(),
            ChallengeScheme.HTTP_BASIC, "connector");
    guard.setVerifier(verifier);
    guard.serEnrole(enroler);
    guard.setNext(router);

    return guard;
}

The implementation of the Verifier looks like this:

Verifier的实现如下所示:

public class MyVerifier extends SecretVerifier {
    public int verify(String identifier, char[] secret)
                     throws IllegalArgumentException {
        ApplicationUser user = loadUser(identifier);
        //user contains both user hints and roles
        if (user!=null
              && compare(user.getPassword().toCharArray(), secret)) {
            Request request = Request.getCurrent();
            request.getClientInfo().setUser(user);
            return SecretVerifier.RESULT_VALID;
        } else {
            return SecretVerifier.RESULT_INVALID;
        }
    }
}

The implementation of the Enroler looks like this:

Enroler的实现如下:

public class MyEnroler implements Enroler {
    public void enrole(ClientInfo clientInfo) {
        Request request = Request.getCurrent();
        User user = request.getClientInfo().getUser();
        if (user!=null) {
            List roles = user.getRoles();
            if (roles!=null) {
                for (UserRole userRole : roles) {
                    // example of role creation
                    Role role = new Role(userRole.getName(), "");
                    clientInfo.getRoles().add(role);
                }
            }
        }
    }
}

Then within the resources, you can check the roles available within the Restlet request to determine if the authenticated user is allowed to execute the method:

然后在资源中,您可以检查Restlet请求中可用的角色,以确定是否允许经过身份验证的用户执行该方法:

public MyServerResource extends ServerResource {
    private boolean hasRole(String expectedRole) {
        List roles = request.getClientInfo().getRoles();
        for (Role role : roles) {
            if (role.getName().equals(expectedRole)) {
                return true;
            }
        }
        return false;
    }

    private void checkRole(String role) {
        if (!hasRole(role)) {
            throw new ResourceException(
               Status.CLIENT_ERROR_FORBIDDEN);
        }
    }

    @Get
    public Representation getElement() {
        checkRole("read");
    }

    @Put
    public void updateElement(Representation repr) {
        checkRole("update");
    }

    @Delete
    public void deleteElement() {
        checkRole("delete");
    }
}

This approach is a bit intrusive. You could also have something more general but based on the HTTP method used and roles. For this, we need to implement a custom Authorizer and register it like this:

这种方法有点干扰。您还可以使用更一般的东西,但基于使用的HTTP方法和角色。为此,我们需要实现一个自定义Authorizer并将其注册为:

    Router router = (...)

    Authorizer authorizer = new MyAuthorizer();
    authorizer.setNext(router);

    Verifier verify = new MyVerifier(...);
    Enroler enroler = new MyEnroler(...);

    ChallengeAuthenticator guard = new ChallengeAuthenticator(getContext(),
            ChallengeScheme.HTTP_BASIC, "connector");
    guard.setVerifier(verifier);
    guard.serEnrole(enroler);
    guard.setNext(authorizer);

    return guard;
}

The implementation of this Authorizer could be something like that:

这个Authorizer的实现可能是这样的:

public class MyAuthorizer extends Authorizer {
    private String[] getRoles = new String[] { "read"};
    private String[] putRoles = new String[] { "update"};
    private String[] deleteRoles = new String[] { "delete"};

    private boolean hasRoles(String[] expectedRoles) {
        List roles = request.getClientInfo().getRoles();
        for (String expectedRole : expectedRoles) {
            for (Role role : roles) {
                if (role.getName().equals(expectedRole)) {
                    return true;
                }
            }
        }
        return false;
    }

    private void checkRoles(String[] roles) {
        if (!hasRole(roles)) {
            throw new ResourceException(
               Status.CLIENT_ERROR_FORBIDDEN);
        }
    }

    public boolean authorize(Request request, Response response) {
        if (!request.getClientInfo().isAuthenticated()) {
            throw new ResourceException(
               Status.CLIENT_ERROR_FORBIDDEN);
        }

        if ("GET".equals(request.getMethod().getName())) {
            checkRoles(getRoles);
        } else if ("PUT".equals(request.getMethod().getName())) {
            checkRoles(putRoles);
        } else if ("DELETE".equals(request.getMethod().getName())) {
            checkRoles(deleteRoles);
        }

        return false;
    }
}

Hope it helps you, Thierry

希望它对你有帮助,蒂埃里