com.appspot.bitlyminous.handler.twitter.ScanLinkHandler.java Source code

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Here is the source code for com.appspot.bitlyminous.handler.twitter.ScanLinkHandler.java

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/*
 * Copyright 2010 Nabeel Mukhtar 
 * 
 * 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.appspot.bitlyminous.handler.twitter;

import java.util.List;
import java.util.Set;
import java.util.logging.Level;

import com.appspot.bitlyminous.constant.ApplicationConstants;
import com.appspot.bitlyminous.constant.ApplicationResources;
import com.appspot.bitlyminous.gateway.GoogleSafeBrowsingGateway;
import com.rosaloves.bitlyj.Bitly;
import com.rosaloves.bitlyj.Url;

import twitter4j.Status;
import twitter4j.StatusUpdate;

/**
 * The Class ScanLinkHandler.
 */
public class ScanLinkHandler extends AbstractTwitterHandler {

    /**
     * Instantiates a new scan link handler.
     * 
     * @param context the context
     */
    public ScanLinkHandler(TwitterContext context) {
        super(context);
    }

    /* (non-Javadoc)
     * @see com.appspot.bitlyminous.handler.twitter.TwitterHandler#execute(twitter4j.Status)
     */
    @Override
    public StatusUpdate execute(Status tweet) {
        try {
            List<String> shortUrls = extractBitlyUrls(tweet.getText());
            if (!shortUrls.isEmpty()) {
                Set<Url> longUrls = getBitlyClient()
                        .call(Bitly.expand(shortUrls.toArray(new String[shortUrls.size()])));
                GoogleSafeBrowsingGateway gateway = getGoogleSafeBrowsingGateway();
                for (Url url : longUrls) {
                    if (!isEmpty(url.getLongUrl())) {
                        if (gateway.isBlacklisted(url.getLongUrl())) {
                            StatusUpdate reply = new StatusUpdate(ApplicationResources.getLocalizedString(
                                    "com.appspot.bitlyminous.message.badurl",
                                    new String[] { "@" + tweet.getUser().getScreenName(),
                                            trimText(tweet.getText(), 20),
                                            ApplicationConstants.GOOGLE_SAFE_BROWSING_REF_URL }));
                            reply.setInReplyToStatusId(tweet.getId());
                            return reply;
                        }
                        if (gateway.isMalwarelisted(url.getLongUrl())) {
                            StatusUpdate reply = new StatusUpdate(ApplicationResources.getLocalizedString(
                                    "com.appspot.bitlyminous.message.badurl",
                                    new String[] { "@" + tweet.getUser().getScreenName(),
                                            trimText(tweet.getText(), 20),
                                            ApplicationConstants.GOOGLE_SAFE_BROWSING_REF_URL }));
                            reply.setInReplyToStatusId(tweet.getId());
                            return reply;
                        }
                    }
                }
            }
        } catch (Exception e) {
            logger.log(Level.SEVERE, "Error while scanning urls.", e);
        }
        return null;
    }

    /**
     * Gets the google safe browsing gateway.
     * 
     * @return the google safe browsing gateway
     */
    protected GoogleSafeBrowsingGateway getGoogleSafeBrowsingGateway() {
        return new GoogleSafeBrowsingGateway(ApplicationConstants.GOOGLE_SAFE_BROWSING_API_KEY, true);
    }

}