added generic headers to http notification

Author: AntonioG70

roda-core/roda-core/src/main/java/org/roda/core/common/notifications/HTTPNotificationProcessor.java

@@ -108,6 +108,12 @@ private boolean post(String endpoint, String content, int timeout) {
       httppost
         .setEntity(new StringEntity(content, ContentType.create("application/json", RodaConstants.DEFAULT_ENCODING)));
 
+      String key = RodaCoreFactory.getRodaConfigurationAsString("core.notification.header.key");
+      String value = RodaCoreFactory.getRodaConfigurationAsString("core.notification.header.value");
+      if (key != null && !key.isEmpty() && value != null && !value.isEmpty()) {
+        httppost.setHeader(key, value);
+      }
+
       HttpResponse response = httpclient.execute(httppost);
       if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
         success = false;

roda-core/roda-core/src/main/resources/config/roda-core.properties

@@ -254,6 +254,8 @@ core.notification.template_path = mail/templates/
 core.notification.ingest_subject = RODA ingest process finished - {RESULT}
 core.notification.default_subject = RODA process finished - {RESULT}
 core.notification.package = org.roda.core.plugins.base.notifications
+#core.notification.header.key =
+#core.notification.header.value =
 
 # parameter.notification.EmailGenericException.enable = true
 # parameter.notification.EmailGenericException.to = test@roda.com