Per-channel sync

Discord no longer seems to support per-guild sync, but per-channel sync
was added. Switch to that syncing user lists on channel join.

Fixes: #201

Signed-off-by: Artem Savkov <artem.savkov@gmail.com>

src/discord-handlers.c

@@ -800,6 +800,28 @@ void discord_handle_message(struct im_connection *ic, json_value *minfo,
   }
 }
 
+static void parse_list_update_item(struct im_connection *ic,
+                                   const char *guild_id, const char *op,
+                                   json_value *item)
+{
+  discord_data *dd = ic->proto_data;
+  json_value *member = json_o_get(item, "member");
+  json_value *uinfo = json_o_get(member, "user");
+  json_value *pinfo = json_o_get(member, "presence");
+
+  if (g_strcmp0(op, "DELETE") == 0) {
+    discord_handle_user(ic, uinfo, guild_id, ACTION_DELETE);
+  } else {
+    user_info *user = get_user(dd, json_o_str(uinfo, "id"), guild_id,
+                               SEARCH_ID);
+    if (user == NULL) {
+      discord_handle_user(ic, uinfo, guild_id, ACTION_CREATE);
+    }
+
+    discord_handle_presence(ic, pinfo, guild_id);
+  }
+}
+
 gboolean discord_parse_message(struct im_connection *ic, gchar *buf, guint64 size)
 {
   discord_data *dd = ic->proto_data;
@@ -944,6 +966,33 @@ gboolean discord_parse_message(struct im_connection *ic, gchar *buf, guint64 siz
         discord_handle_presence(ic, pinfo, id);
       }
     }
+  } else if (g_strcmp0(event, "GUILD_MEMBER_LIST_UPDATE") == 0) {
+    json_value *data = json_o_get(js, "d");
+    json_value *ops = json_o_get(data, "ops");
+    const char *guild_id = json_o_str(data, "guild_id");
+
+    if (ops != NULL && ops->type == json_array) {
+      for (int oidx = 0; oidx < ops->u.array.length; oidx++) {
+        const char *op = json_o_str(ops->u.array.values[oidx], "op");
+
+        if (g_strcmp0(op, "SYNC") == 0) {
+          json_value *items = json_o_get(ops->u.array.values[oidx], "items");
+          if (items != NULL && items->type == json_array) {
+            for (int iidx = 0; iidx < items->u.array.length; iidx++) {
+              json_value *item = items->u.array.values[iidx];
+              if (item != NULL && json_o_get(item, "member") != NULL) {
+                parse_list_update_item(ic, guild_id, op, item);
+              }
+            }
+          }
+        } else {
+          json_value *item = json_o_get(ops->u.array.values[oidx], "item");
+          if (item != NULL && json_o_get(item, "member") != NULL) {
+            parse_list_update_item(ic, guild_id, op, item);
+          }
+        }
+      }
+    }
   } else if (g_strcmp0(event, "VOICE_STATE_UPDATE") == 0) {
     json_value *vsinfo = json_o_get(js, "d");
     discord_handle_voice_state(ic, vsinfo, json_o_str(vsinfo, "guild_id"));

src/discord-websockets.c

@@ -98,6 +98,16 @@ void discord_ws_sync_server(discord_data *dd, const char *id)
   g_string_free(buf, TRUE);
 }
 
+void discord_ws_sync_channel(discord_data *dd, const char *guild_id,
+                             const char *channel_id, unsigned int members)
+{
+  GString *buf = g_string_new("");
+  g_string_printf(buf, "{\"op\":%d,\"d\":{\"guild_id\":\"%s\",\"typing\":true,\"activities\":true,\"channels\":{\"%s\":[[0,%u]]}}}",
+                  OPCODE_REQUEST_SYNC_CHANNEL, guild_id, channel_id, members);
+  discord_ws_send_payload(dd, buf->str, buf->len);
+  g_string_free(buf, TRUE);
+}
+
 static gboolean discord_ws_heartbeat_timeout(gpointer data, gint fd,
                                              b_input_condition cond)
 {

src/discord-websockets.h

@@ -29,7 +29,9 @@ typedef enum {
   OPCODE_INVALID_SESSION,
   OPCODE_HELLO,
   OPCODE_HEARTBEAT_ACK,
-  OPCODE_REQUEST_SYNC
+  OPCODE_REQUEST_SYNC,
+  OPCODE_UNKNOWN,
+  OPCODE_REQUEST_SYNC_CHANNEL
 } discord_opcode;
 
 gboolean discord_ws_keepalive_loop(gpointer data, gint fd,
@@ -40,3 +42,5 @@ void discord_ws_cleanup(discord_data *dd);
 void discord_ws_set_status(struct im_connection *ic, gchar *status,
     gchar *message);
 void discord_ws_sync_server(discord_data *dd, const char *id);
+void discord_ws_sync_channel(discord_data *dd, const char *guild_id,
+                             const char *channel_id, unsigned int members);

src/discord.c

@@ -195,6 +195,7 @@ struct groupchat *discord_chat_do_join(struct im_connection *ic,
   if (cinfo != NULL && cinfo->type == CHANNEL_TEXT) {
     sinfo = cinfo->to.channel.sinfo;
     gc = imcb_chat_new(ic, cinfo->to.channel.name);
+    discord_ws_sync_channel(dd, sinfo->id, cinfo->id, 0);
 
     if (is_auto_join) {
       imcb_chat_name_hint(gc, room);