configurable user agent string (#825)

config.dev.yml

@@ -67,6 +67,9 @@ app:
   # announcement string displayed on the main page
   announcement:
   
+  # user-agent string that will be used by the http client, leave empty for the default one
+  userAgent:
+  
 # Database connection
 # -------------------  
 # for MySQL

config.yml.example

@@ -68,6 +68,9 @@ app:
   # announcement string displayed on the main page
   announcement:
   
+  # user-agent string that will be used by the http client, leave empty for the default one
+  userAgent:
+  
 # Database connection
 # -------------------  
 # for MySQL

src/main/java/com/commafeed/CommaFeedConfiguration.java

@@ -142,6 +142,8 @@ public class CommaFeedConfiguration extends Configuration {
 		@Valid
 		private String announcement;
 
+		private String userAgent;
+
 		public Date getUnreadThreshold() {
 			int keepStatusDays = getKeepStatusDays();
 			return keepStatusDays > 0 ? DateUtils.addDays(new Date(), -1 * keepStatusDays) : null;

src/main/java/com/commafeed/backend/HttpGetter.java

@@ -70,7 +70,10 @@ public class HttpGetter {
 
 	@Inject
 	public HttpGetter(CommaFeedConfiguration config) {
-		this.userAgent = String.format("CommaFeed/%s (https://github.com/Athou/commafeed)", config.getVersion());
+		this.userAgent = config.getApplicationSettings().getUserAgent();
+		if (this.userAgent == null) {
+			this.userAgent = String.format("CommaFeed/%s (https://github.com/Athou/commafeed)", config.getVersion());
+		}
 	}
 
 	public HttpResult getBinary(String url, int timeout) throws ClientProtocolException, IOException, NotModifiedException {