facebook favicon fetcher

src/main/java/com/commafeed/CommaFeedModule.java

@@ -13,6 +13,7 @@ import com.commafeed.backend.cache.NoopCacheService;
 import com.commafeed.backend.cache.RedisCacheService;
 import com.commafeed.backend.favicon.AbstractFaviconFetcher;
 import com.commafeed.backend.favicon.DefaultFaviconFetcher;
+import com.commafeed.backend.favicon.FacebookFaviconFetcher;
 import com.commafeed.backend.favicon.YoutubeFaviconFetcher;
 import com.google.inject.AbstractModule;
 import com.google.inject.Provides;
@@ -40,6 +41,7 @@ public class CommaFeedModule extends AbstractModule {
 
 		Multibinder<AbstractFaviconFetcher> multibinder = Multibinder.newSetBinder(binder(), AbstractFaviconFetcher.class);
 		multibinder.addBinding().to(YoutubeFaviconFetcher.class);
+		multibinder.addBinding().to(FacebookFaviconFetcher.class);
 		multibinder.addBinding().to(DefaultFaviconFetcher.class);
 	}
 }

src/main/java/com/commafeed/backend/favicon/FacebookFaviconFetcher.java

@@ -0,0 +1,79 @@
+package com.commafeed.backend.favicon;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+
+import com.commafeed.backend.HttpGetter;
+import com.commafeed.backend.HttpGetter.HttpResult;
+import com.commafeed.backend.model.Feed;
+
+@Slf4j
+@RequiredArgsConstructor(onConstructor = @__({ @Inject }))
+@Singleton
+public class FacebookFaviconFetcher extends AbstractFaviconFetcher {
+
+	private final HttpGetter getter;
+
+	@Override
+	public byte[] fetch(Feed feed) {
+		String url = feed.getUrl();
+
+		if (!url.toLowerCase().contains("www.facebook.com")) {
+			return null;
+		}
+
+		String userName = extractUserName(url);
+		if (userName == null) {
+			return null;
+		}
+
+		String iconUrl = String.format("https://graph.facebook.com/%s/picture?type=square&height=16", userName);
+
+		byte[] bytes = null;
+		String contentType = null;
+
+		try {
+			log.debug("Getting Facebook user's icon, {}", url);
+
+			HttpResult iconResult = getter.getBinary(iconUrl, TIMEOUT);
+			bytes = iconResult.getContent();
+			contentType = iconResult.getContentType();
+		} catch (Exception e) {
+			log.debug("Failed to retrieve YouTube icon", e);
+		}
+
+		if (!isValidIconResponse(bytes, contentType)) {
+			bytes = null;
+		}
+		return bytes;
+	}
+
+	private String extractUserName(String url) {
+		URI uri = null;
+		try {
+			uri = new URI(url);
+		} catch (URISyntaxException e) {
+			log.debug("could not parse url", e);
+			return null;
+		}
+		List<NameValuePair> params = URLEncodedUtils.parse(uri, StandardCharsets.UTF_8.name());
+		for (NameValuePair param : params) {
+			if ("id".equals(param.getName())) {
+				return param.getValue();
+			}
+		}
+		return null;
+	}
+
+}