store normalized urls

src/main/java/com/commafeed/backend/dao/FeedDAO.java

@@ -14,6 +14,7 @@ import javax.persistence.criteria.SetJoin;
 import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.lang.StringUtils;
 
+import com.commafeed.backend.feeds.FeedUtils;
 import com.commafeed.backend.model.Feed;
 import com.commafeed.backend.model.FeedSubscription;
 import com.commafeed.backend.model.FeedSubscription_;
@@ -74,6 +75,14 @@ public class FeedDAO extends GenericDAO<Feed> {
 		if (feed != null && StringUtils.equals(url, feed.getUrl())) {
 			return feed;
 		}
+
+		String normalized = FeedUtils.normalizeURL(url);
+		feeds = findByField(Feed_.normalizedUrlHash, DigestUtils.sha1Hex(normalized));
+		feed = Iterables.getFirst(feeds, null);
+		if (feed != null && StringUtils.equals(normalized, feed.getNormalizedUrl())) {
+			return feed;
+		}
+
 		return null;
 	}
 

src/main/java/com/commafeed/backend/feeds/FeedRefreshTaskGiver.java

@@ -12,6 +12,7 @@ import javax.annotation.PreDestroy;
 import javax.enterprise.context.ApplicationScoped;
 import javax.inject.Inject;
 
+import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.lang.time.DateUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -158,6 +159,9 @@ public class FeedRefreshTaskGiver {
 	}
 
 	public void giveBack(Feed feed) {
+		String normalized = FeedUtils.normalizeURL(feed.getUrl());
+		feed.setNormalizedUrl(normalized);
+		feed.setNormalizedUrlHash(DigestUtils.sha1Hex(normalized));
 		giveBackQueue.add(feed);
 	}
 

src/main/java/com/commafeed/backend/feeds/FeedUtils.java

@@ -87,11 +87,25 @@ public class FeedUtils {
 		return encoding;
 	}
 
+	/**
+	 * Normalize the url. The resulting url is not meant to be used but rather
+	 * as a mean to identify a feed and avoid duplicates
+	 */
 	public static String normalizeURL(String url) {
 		if (url == null) {
 			return null;
 		}
-		return URLCanonicalizer.getCanonicalURL(url);
+		String normalized = URLCanonicalizer.getCanonicalURL(url);
+		if (normalized == null) {
+			return url;
+		}
+		normalized = normalized.toLowerCase();
+
+		if (normalized.startsWith("https")) {
+			normalized = "http" + normalized.substring(5);
+		}
+		normalized = normalized.replace("feeds2.feedburner.com", "feeds.feedburner.com");
+		return normalized;
 	}
 
 	/**

src/main/java/com/commafeed/backend/model/Feed.java

@@ -34,6 +34,12 @@ public class Feed extends AbstractModel {
 
 	@Column(length = 40, nullable = false)
 	private String urlHash;
+	
+	@Column(length = 2048, nullable = false)
+	private String normalizedUrl;
+	
+	@Column(length = 40, nullable = false)
+	private String normalizedUrlHash;
 
 	/**
 	 * The url of the website, extracted from the feed
@@ -315,4 +321,20 @@ public class Feed extends AbstractModel {
 		this.urgent = urgent;
 	}
 
+	public String getNormalizedUrl() {
+		return normalizedUrl;
+	}
+
+	public void setNormalizedUrl(String normalizedUrl) {
+		this.normalizedUrl = normalizedUrl;
+	}
+
+	public String getNormalizedUrlHash() {
+		return normalizedUrlHash;
+	}
+
+	public void setNormalizedUrlHash(String normalizedUrlHash) {
+		this.normalizedUrlHash = normalizedUrlHash;
+	}
+
 }

src/main/java/com/commafeed/backend/services/FeedService.java

@@ -8,6 +8,7 @@ import javax.inject.Inject;
 import org.apache.commons.codec.digest.DigestUtils;
 
 import com.commafeed.backend.dao.FeedDAO;
+import com.commafeed.backend.feeds.FeedUtils;
 import com.commafeed.backend.model.Feed;
 
 @Singleton
@@ -20,9 +21,12 @@ public class FeedService {
 	public Feed findOrCreate(String url) {
 		Feed feed = feedDAO.findByUrl(url);
 		if (feed == null) {
+			String normalized = FeedUtils.normalizeURL(url);
 			feed = new Feed();
 			feed.setUrl(url);
 			feed.setUrlHash(DigestUtils.sha1Hex(url));
+			feed.setNormalizedUrl(normalized);
+			feed.setNormalizedUrlHash(DigestUtils.sha1Hex(normalized));
 			feedDAO.saveOrUpdate(feed);
 		}
 		return feed;