Try to log in on startup

Maybe we have to change this in the future so that the server logs in
on a regular basis.

server/src/main/java/ctbrec/recorder/server/HttpServer.java

@@ -95,6 +95,7 @@ public class HttpServer {
         for (Site site : sites) {
             if (site.isEnabled()) {
                 site.init();
+                safeLogin(site);
             }
         }
         onlineMonitor = new OnlineMonitor(recorder);
@@ -102,6 +103,21 @@ public class HttpServer {
         startHttpServer();
     }
 
+    private void safeLogin(Site site) {
+        if (site.credentialsAvailable()) {
+            try {
+                boolean success = site.login();
+                if (success) {
+                    LOG.info("Successfully logged in to {}", site.getName());
+                } else {
+                    throw new RuntimeException("Login returned false");
+                }
+            } catch (Exception e) {
+                LOG.info("Login to {} failed", site.getName());
+            }
+        }
+    }
+
     private void createSites() {
         sites.add(new BongaCams());
         sites.add(new Cam4());