/*
* Copyright 2012 Nodeable Inc
*
* 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.streamreduce.util;
import com.streamreduce.ProviderIdConstants;
import com.streamreduce.core.model.Connection;
import com.streamreduce.core.service.exception.InvalidCredentialsException;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;
import org.apache.abdera.Abdera;
import org.apache.abdera.model.Entry;
import org.apache.abdera.parser.Parser;
import org.springframework.util.Assert;
import javax.ws.rs.core.MediaType;
import java.io.IOException;
import java.io.StringReader;
import java.net.URL;
import java.util.List;
/**
* FeedClient provides necessary methods for interacting with feeds.
*/
public class FeedClient extends ExternalIntegrationClient {
private String feedUrl = null;
public FeedClient(Connection connection) {
super(connection);
this.feedUrl = connection.getUrl();
Assert.isTrue(connection.getProviderId().equals(ProviderIdConstants.FEED_PROVIDER_ID));
}
/**
* {@inheritDoc}
*/
@Override
public void validateConnection() throws InvalidCredentialsException, IOException {
URL url = new URL(feedUrl);
try (XmlReader xmlReader = new XmlReader(url)) {
SyndFeed rssFeed = new SyndFeedInput().build(xmlReader);
rssFeed.getEntries();
} catch (FeedException e) {
throw new RuntimeException("Unable to read syndication from " + url.toString(), e);
} catch (Exception e) {
throw new RuntimeException("Encountered exception reading feed from " + url.toString(), e);
}
}
/**
* Returns the available feed entries.
*
* @return the feed entries
*/
public List<Entry> getFeedEntries() {
String rawActivityResponse;
String username = getConnectionCredentials().getIdentity();
String password = getConnectionCredentials().getCredential();
try {
rawActivityResponse = HTTPUtils.openUrl(feedUrl, "GET", null, MediaType.APPLICATION_ATOM_XML, username,
password, null, null);
} catch (Exception e) {
LOGGER.error("Error retrieving the feed activity using " +
(username != null ? username : "anonymous") +
" for: " + feedUrl, e);
return null;
}
Abdera abdera = new Abdera();
Parser parser = abdera.getParser();
org.apache.abdera.model.Document<org.apache.abdera.model.Feed> rssDoc = parser
.parse(new StringReader(rawActivityResponse));
org.apache.abdera.model.Feed rssFeed = rssDoc.getRoot();
return rssFeed.getEntries();
}
}