4 files changed, 33 insertions, 5 deletions
diff --git a/src/xmpp/message.c b/src/xmpp/message.c
index 2a6ad234..47cf35d7 100644
--- a/src/xmpp/message.c
+++ b/src/xmpp/message.c
@@ -326,6 +326,7 @@ message_send_chat_omemo(const char *const jid, uint32_t sid, GList *keys,
     if (muc) {
         id = connection_create_stanza_id("muc");
         message = xmpp_message_new(ctx, STANZA_TYPE_GROUPCHAT, jid, id);
+        stanza_attach_origin_id(ctx, message, id);
     } else {
         id = connection_create_stanza_id("msg");
         message = xmpp_message_new(ctx, STANZA_TYPE_CHAT, jid, id);
@@ -442,23 +443,24 @@ message_send_private(const char *const fulljid, const char *const msg, const cha
     xmpp_stanza_release(message);
 }
 
-void
+char*
 message_send_groupchat(const char *const roomjid, const char *const msg, const char *const oob_url)
 {
     xmpp_ctx_t * const ctx = connection_get_ctx();
     char *id = connection_create_stanza_id("muc");
 
     xmpp_stanza_t *message = xmpp_message_new(ctx, STANZA_TYPE_GROUPCHAT, roomjid, id);
+    stanza_attach_origin_id(ctx, message, id);
     xmpp_message_set_body(message, msg);
 
-    free(id);
-
     if (oob_url) {
         stanza_attach_x_oob_url(ctx, message, oob_url);
     }
 
     _send_message_stanza(message);
     xmpp_stanza_release(message);
+
+    return id;
 }
 
 void
@@ -687,6 +689,14 @@ _handle_groupchat(xmpp_stanza_t *const stanza)
 {
     xmpp_ctx_t *ctx = connection_get_ctx();
     char *message = NULL;
+
+    const char *id = xmpp_stanza_get_id(stanza);
+
+    xmpp_stanza_t *origin = xmpp_stanza_get_child_by_ns(stanza, STANZA_NS_STABLE_ID);
+    if (origin && g_strcmp0(xmpp_stanza_get_name(origin), STANZA_NAME_ORIGIN_ID) == 0) {
+        id = xmpp_stanza_get_attribute(origin, STANZA_ATTR_ID);
+    }
+
     const char *room_jid = xmpp_stanza_get_from(stanza);
     Jid *jid = jid_create(room_jid);
 
@@ -750,7 +760,7 @@ _handle_groupchat(xmpp_stanza_t *const stanza)
         sv_ev_room_history(jid->barejid, jid->resourcepart, timestamp, message, omemo);
         g_date_time_unref(timestamp);
     } else {
-        sv_ev_room_message(jid->barejid, jid->resourcepart, message, omemo);
+        sv_ev_room_message(jid->barejid, jid->resourcepart, message, id, omemo);
     }
 
     xmpp_free(ctx, message);
diff --git a/src/xmpp/stanza.c b/src/xmpp/stanza.c
index f4fd8aa8..615de44f 100644
--- a/src/xmpp/stanza.c
+++ b/src/xmpp/stanza.c
@@ -2417,6 +2417,21 @@ stanza_create_pubsub_configure_submit(xmpp_ctx_t *ctx, const char *const id, con
     return iq;
 }
 
+xmpp_stanza_t*
+stanza_attach_origin_id(xmpp_ctx_t *ctx, xmpp_stanza_t *stanza, const char *const id)
+{
+    xmpp_stanza_t *origin_id = xmpp_stanza_new(ctx);
+    xmpp_stanza_set_name(origin_id, STANZA_NAME_ORIGIN_ID);
+    xmpp_stanza_set_ns(origin_id, STANZA_NS_STABLE_ID);
+    xmpp_stanza_set_attribute(origin_id, STANZA_ATTR_ID, id);
+
+    xmpp_stanza_add_child(stanza, origin_id);
+
+    xmpp_stanza_release(origin_id);
+
+    return stanza;
+}
+
 static void
 _stanza_add_unique_id(xmpp_stanza_t *stanza, char *prefix)
 {
diff --git a/src/xmpp/stanza.h b/src/xmpp/stanza.h
index eaf76a27..e5e17ba4 100644
--- a/src/xmpp/stanza.h
+++ b/src/xmpp/stanza.h
@@ -102,6 +102,7 @@
 #define STANZA_NAME_URL "url"
 #define STANZA_NAME_COMMAND "command"
 #define STANZA_NAME_CONFIGURE "configure"
+#define STANZA_NAME_ORIGIN_ID "origin-id"
 
 // error conditions
 #define STANZA_NAME_BAD_REQUEST "bad-request"
@@ -196,6 +197,7 @@
 #define STANZA_NS_OMEMO "eu.siacs.conversations.axolotl"
 #define STANZA_NS_OMEMO_DEVICELIST "eu.siacs.conversations.axolotl.devicelist"
 #define STANZA_NS_OMEMO_BUNDLES "eu.siacs.conversations.axolotl.bundles"
+#define STANZA_NS_STABLE_ID "urn:xmpp:sid:0"
 
 #define STANZA_DATAFORM_SOFTWARE "urn:xmpp:dataforms:softwareinfo"
 
@@ -238,6 +240,7 @@ xmpp_stanza_t* stanza_attach_hints_no_store(xmpp_ctx_t *ctx, xmpp_stanza_t *stan
 xmpp_stanza_t* stanza_attach_hints_store(xmpp_ctx_t *ctx, xmpp_stanza_t *stanza);
 xmpp_stanza_t* stanza_attach_receipt_request(xmpp_ctx_t *ctx, xmpp_stanza_t *stanza);
 xmpp_stanza_t* stanza_attach_x_oob_url(xmpp_ctx_t *ctx, xmpp_stanza_t *stanza, const char *const url);
+xmpp_stanza_t* stanza_attach_origin_id(xmpp_ctx_t *ctx, xmpp_stanza_t *stanza, const char *const id);
 
 xmpp_stanza_t* stanza_create_room_join_presence(xmpp_ctx_t *const ctx,
     const char *const full_room_jid, const char *const passwd);
diff --git a/src/xmpp/xmpp.h b/src/xmpp/xmpp.h
index 39877bc2..54a56f02 100644
--- a/src/xmpp/xmpp.h
+++ b/src/xmpp/xmpp.h
@@ -144,7 +144,7 @@ char* message_send_chat_otr(const char *const barejid, const char *const msg, gb
 char* message_send_chat_pgp(const char *const barejid, const char *const msg, gboolean request_receipt);
 char* message_send_chat_omemo(const char *const jid, uint32_t sid, GList *keys, const unsigned char *const iv, size_t iv_len, const unsigned char *const ciphertext, size_t ciphertext_len, gboolean request_receipt, gboolean muc);
 void message_send_private(const char *const fulljid, const char *const msg, const char *const oob_url);
-void message_send_groupchat(const char *const roomjid, const char *const msg, const char *const oob_url);
+char* message_send_groupchat(const char *const roomjid, const char *const msg, const char *const oob_url);
 void message_send_groupchat_subject(const char *const roomjid, const char *const subject);
 void message_send_inactive(const char *const jid);
 void message_send_composing(const char *const jid);