3 files changed, 21 insertions, 4 deletions
diff --git a/xmpp-vala/CMakeLists.txt b/xmpp-vala/CMakeLists.txt
index fba9966d..faff9e79 100644
--- a/xmpp-vala/CMakeLists.txt
+++ b/xmpp-vala/CMakeLists.txt
@@ -68,6 +68,7 @@ SOURCES
     "src/module/xep/0280_message_carbons.vala"
     "src/module/xep/0313_message_archive_management.vala"
     "src/module/xep/0333_chat_markers.vala"
+    "src/module/xep/0334_message_processing_hints.vala"
     "src/module/xep/0363_http_file_upload.vala"
     "src/module/xep/0368_srv_records_tls.vala"
     "src/module/xep/0380_explicit_encryption.vala"
diff --git a/xmpp-vala/src/module/xep/0085_chat_state_notifications.vala b/xmpp-vala/src/module/xep/0085_chat_state_notifications.vala
index e1106597..5a9b0914 100644
--- a/xmpp-vala/src/module/xep/0085_chat_state_notifications.vala
+++ b/xmpp-vala/src/module/xep/0085_chat_state_notifications.vala
@@ -21,11 +21,12 @@ public class Module : XmppStreamModule {
     /**
     * "A message stanza that does not contain standard messaging content [...] SHOULD be a state other than <active/>" (0085, 5.6)
     */
-    public void send_state(XmppStream stream, Jid jid, string state) {
-        MessageStanza message = new MessageStanza();
-        message.to = jid;
-        message.type_ = MessageStanza.TYPE_CHAT;
+    public void send_state(XmppStream stream, Jid jid, string message_type, string state) {
+        MessageStanza message = new MessageStanza() { to=jid, type_=message_type };
         message.stanza.put_node(new StanzaNode.build(state, NS_URI).add_self_xmlns());
+
+        MessageProcessingHints.set_message_hint(message, MessageProcessingHints.HINT_NO_STORE);
+
         stream.get_module(MessageModule.IDENTITY).send_message(stream, message);
     }
 
diff --git a/xmpp-vala/src/module/xep/0334_message_processing_hints.vala b/xmpp-vala/src/module/xep/0334_message_processing_hints.vala
new file mode 100644
index 00000000..352e03ac
--- /dev/null
+++ b/xmpp-vala/src/module/xep/0334_message_processing_hints.vala
@@ -0,0 +1,15 @@
+namespace Xmpp.Xep.MessageProcessingHints {
+
+private const string NS_URI = "urn:xmpp:hints";
+
+private const string HINT_NO_PERMANENT_STORE = "no-permanent-store";
+private const string HINT_NO_STORE = "no-store";
+private const string HINT_NO_COPY = "no-copy";
+private const string HINT_STORE = "store";
+
+public static void set_message_hint(MessageStanza message, string message_hint) {
+    StanzaNode hint_node = (new StanzaNode.build(message_hint, NS_URI)).add_self_xmlns();
+    message.stanza.put_node(hint_node);
+}
+
+}