From 67448469ae727ff8b0bce5faf32424ce164d81a2 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 28 Dec 2020 00:56:45 -0800
Subject: [PATCH] ircd::m::event::append: Add visibility query support w/
 option.

---
 include/ircd/m/event/append.h |  1 +
 matrix/event_append.cc        | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/ircd/m/event/append.h b/include/ircd/m/event/append.h
index 351235992..cc8157293 100644
--- a/include/ircd/m/event/append.h
+++ b/include/ircd/m/event/append.h
@@ -50,6 +50,7 @@ struct ircd::m::event::append::opts
 	bool query_txnid {true};
 	bool query_prev_state {true};
 	bool query_redacted {true};
+	bool query_visible {false};
 };
 
 inline
diff --git a/matrix/event_append.cc b/matrix/event_append.cc
index 40eb8168b..a5f806786 100644
--- a/matrix/event_append.cc
+++ b/matrix/event_append.cc
@@ -104,6 +104,18 @@ ircd::m::event::append::append(json::stack::object &object,
 	if(opts.event_filter && !m::match(*opts.event_filter, event))
 		return false;
 
+	if(opts.query_visible && opts.user_id && !visible(event, *opts.user_id))
+	{
+		log::debug
+		{
+			log, "Not sending event %s because not visible to %s.",
+			string_view{event.event_id},
+			string_view{*opts.user_id},
+		};
+
+		return false;
+	}
+
 	const bool has_event_idx
 	{
 		opts.event_idx && *opts.event_idx