org.surfnet.oaaas.resource.AbstractResource.java Source code

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Here is the source code for org.surfnet.oaaas.resource.AbstractResource.java

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/*
 * Copyright 2012 SURFnet bv, The Netherlands
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.surfnet.oaaas.resource;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import javax.inject.Inject;
import javax.persistence.EntityExistsException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.Validator;
import javax.ws.rs.core.Response;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;
import org.surfnet.oaaas.auth.AuthorizationServerFilter;
import org.surfnet.oaaas.auth.OAuth2Validator;
import org.surfnet.oaaas.model.*;
import org.surfnet.oaaas.repository.ExceptionTranslator;

/**
 * Abstract resource that defines common functionality.
 */
public class AbstractResource {

    public static final String SCOPE_READ = "read";
    public static final String SCOPE_WRITE = "write";

    private static final Logger LOG = LoggerFactory.getLogger(AbstractResource.class);

    private final static String LINE_SEPARATOR = System.getProperty("line.separator");

    @Inject
    private ExceptionTranslator exceptionTranslator;

    @Inject
    protected Validator validator;

    public Response buildErrorResponse(Exception e) {
        final Throwable jpaException = exceptionTranslator.translate(e);
        Response.Status s;
        String reason;
        if (jpaException instanceof EntityExistsException) {
            s = Response.Status.BAD_REQUEST;
            reason = "Violating unique constraints";
        } else if (jpaException instanceof ConstraintViolationException) {
            ConstraintViolationException constraintViolationException = (ConstraintViolationException) jpaException;
            return buildViolationErrorResponse(constraintViolationException.getConstraintViolations());
        } else {
            s = Response.Status.INTERNAL_SERVER_ERROR;
            reason = "Internal server error";
        }
        LOG.info("Responding with error '" + s + "', '" + reason + "'. Cause attached.", e);
        return Response.status(s).entity(reason).build();
    }

    protected Response buildViolationErrorResponse(Set<ConstraintViolation<?>> violations) {
        ValidationErrorResponse responseBody = new ValidationErrorResponse(violations);
        return Response.status(Response.Status.BAD_REQUEST).entity(responseBody).build();
    }

    protected String getUserId(HttpServletRequest request) {
        VerifyTokenResponse verifyTokenResponse = (VerifyTokenResponse) request
                .getAttribute(AuthorizationServerFilter.VERIFY_TOKEN_RESPONSE);
        return verifyTokenResponse.getPrincipal().getName();
    }

    protected void validate(AbstractEntity entity) {
        Set<ConstraintViolation<AbstractEntity>> validate = validator.validate(entity);
        if (!CollectionUtils.isEmpty(validate)) {
            throw new ConstraintViolationException((Set) validate);
        }
    }

    public String generateRandom() {
        return UUID.randomUUID().toString();
    }

    public Response validateScope(HttpServletRequest request, List<String> requiredScopes) {
        VerifyTokenResponse verifyTokenResponse = (VerifyTokenResponse) request
                .getAttribute(AuthorizationServerFilter.VERIFY_TOKEN_RESPONSE);
        List<String> grantedScopes = verifyTokenResponse.getScopes();
        for (String requiredScope : requiredScopes) {
            if (!grantedScopes.contains(requiredScope)) {
                LOG.debug("Resource required scopes ({}) which the client has not been granted ({})",
                        requiredScopes, grantedScopes);
                return Response.status(HttpServletResponse.SC_BAD_REQUEST)
                        .entity(new ErrorResponse(OAuth2Validator.ValidationResponse.SCOPE_NOT_VALID.getValue(),
                                OAuth2Validator.ValidationResponse.SCOPE_NOT_VALID.getDescription()))
                        .build();
            }
        }
        return null;
    }
}