com.baby.web.DisconnectController.java Source code

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Here is the source code for com.baby.web.DisconnectController.java

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/*
 * Copyright 2012 the original author or authors.
 *
 * 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 com.baby.web;

import java.util.HashSet;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.social.connect.ConnectionKey;
import org.springframework.social.connect.ConnectionRepository;
import org.springframework.social.connect.UsersConnectionRepository;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * Spring MVC controller for handling deauthorization callbacks from Facebook as described at https://developers.facebook.com/docs/authentication/.
 * Handles a POST request to /disconnect/facebook with a single signed_request parameter, extracts the Facebook user ID from the signed_request,
 * then removes all connections for the given Facebook user.
 * @author habuma
 */
//@Controller
@RequestMapping("/disconnect/facebook")
public class DisconnectController {

    private final static Log logger = LogFactory.getLog(DisconnectController.class);

    private final SignedRequestDecoder signedRequestDecoder;

    private final UsersConnectionRepository usersConnectionRepository;

    /**
     * Constructs a DisconnectController.
     * @param connectionRepository the current user's {@link ConnectionRepository} needed to persist connections; must be a proxy to a request-scoped bean
     * @param applicationSecret the application's secret as assigned by Facebook at registration time. Used to validate signed_request.
     */
    @Autowired
    public DisconnectController(UsersConnectionRepository usersConnectionRepository, String applicationSecret) {
        this.usersConnectionRepository = usersConnectionRepository;
        this.signedRequestDecoder = new SignedRequestDecoder(applicationSecret);
    }

    @RequestMapping(method = RequestMethod.POST)
    public ResponseEntity<String> disconnect(@RequestParam("signed_request") String signedRequest) {
        try {
            String userId = getUserId(signedRequest);
            logger.info(
                    "Deauthorization request received for Facebook User ID: " + userId + "; Removing connections.");
            Set<String> providerUserIds = new HashSet<String>();
            providerUserIds.add(userId);
            Set<String> localUserIds = usersConnectionRepository.findUserIdsConnectedTo("facebook",
                    providerUserIds);
            for (String localUserId : localUserIds) {
                ConnectionRepository connectionRepository = usersConnectionRepository
                        .createConnectionRepository(localUserId);
                logger.info("  Removing Facebook connection for local user '" + localUserId + "'");
                connectionRepository.removeConnection(new ConnectionKey("facebook", userId));
            }
            return new ResponseEntity<String>(HttpStatus.NO_CONTENT);
        } catch (SignedRequestException e) {
            return new ResponseEntity<String>(HttpStatus.BAD_REQUEST);
        }
    }

    private String getUserId(String signedRequest) throws SignedRequestException {
        return (String) signedRequestDecoder.decodeSignedRequest(signedRequest).get("user_id");
    }

}