Handling HTTPS connection timeout #70

* sets timeout for HTTPS request connection to 10 seconds
* in case of SocketTimeoutException throw warning and fall back to HTTP

src/main/java/net/imagej/updater/util/AvailableSites.java

@@ -38,10 +38,7 @@
 
 import javax.net.ssl.SSLHandshakeException;
 import java.io.IOException;
-import java.net.HttpURLConnection;
-import java.net.ProtocolException;
-import java.net.URL;
-import java.net.UnknownHostException;
+import java.net.*;
 import java.util.*;
 
 /**
@@ -71,6 +68,7 @@ public static void checkHTTPSSupport(LogService log) {
 		}
 		try {
 			connection.setRequestMethod("HEAD");
+			connection.setConnectTimeout(10000);
 		} catch (ProtocolException e) {
 			e.printStackTrace();
 		}
@@ -91,6 +89,13 @@ public static void checkHTTPSSupport(LogService log) {
 			if(log != null) log.warn(msg);
 			else System.out.println("[WARNING] " + msg);
 		}
+		catch(SocketTimeoutException e) {
+			secureMode = false;
+			String msg = "Timeout while trying to update securely via HTTPS. Will fall back to HTTP. This is a security risk. " +
+					"Please contact your system administrator to enable communication via HTTPS.";
+			if(log != null) log.warn(msg);
+			else System.out.println("[WARNING] " + msg);
+		}
 		catch (IOException e) {
 			e.printStackTrace();
 		}