Implement atom feeds

src/main/scala/app/ControllerBase.scala

@@ -143,6 +143,9 @@ case class Context(settings: SystemSettingsService.SystemSettings, loginAccount:
 
   lazy val currentPath = request.getRequestURI.substring(request.getContextPath.length)
 
+  lazy val baseURL = request.getRequestURL.substring(0, request.getRequestURL.length - request.getRequestURI.length) + path
+  lazy val host = request.getServerName
+
   /**
    * Get object from cache.
    *

src/main/scala/app/IndexController.scala

@@ -46,6 +46,11 @@ trait IndexControllerBase extends ControllerBase {
     redirect("/")
   }
 
+  get("/activities.atom"){
+    contentType = "application/atom+xml; type=feed"
+    xml.feed(getRecentActivities())
+  }
+
   /**
    * Set account information into HttpSession and redirect.
    */

src/main/scala/view/helpers.scala

@@ -15,6 +15,11 @@ object helpers extends AvatarImageProvider with LinkConverter with RequestCache
    */
   def datetime(date: Date): String = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date)
 
+  /**
+   * Format java.util.Date to "yyyy-MM-dd'T'hh:mm:ss'Z'".
+   */
+  def datetimeRFC3339(date: Date): String = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss'Z'").format(date).replaceAll("(\\d\\d)(\\d\\d)$","$1:$2")
+
   /**
    * Format java.util.Date to "yyyy-MM-dd".
    */