ircd:Ⓜ️:room: Add aliases interface.

include/ircd/m/room.h

@@ -85,4 +85,5 @@ namespace ircd::m
 #include "room/head.h"
 #include "room/auth.h"
 #include "room/power.h"
+#include "room/aliases.h"
 #include "room/stats.h"

include/ircd/m/room/aliases.h

@@ -0,0 +1,34 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_M_ROOM_MEMBERS_H
+
+/// Interface to the aliases
+///
+/// This interface focuses specifically on room aliases. These are aliases contained
+/// in a room's state.
+///
+struct ircd::m::room::aliases
+{
+	using closure_bool = std::function<bool (const alias &)>;
+
+	m::room room;
+
+	bool for_each(const string_view &server, const closure_bool &) const;
+	bool for_each(const closure_bool &) const;
+	bool has(const alias &) const;
+	size_t count(const string_view &server) const;
+	size_t count() const;
+
+	aliases(const m::room &room)
+	:room{room}
+	{}
+};

include/ircd/m/room/room.h

@@ -37,6 +37,7 @@ struct ircd::m::room
 	struct head;
 	struct auth;
 	struct power;
+	struct aliases;
 	struct stats;
 
 	using id = m::id::room;

ircd/m_room.cc

@@ -2359,6 +2359,103 @@ ircd::m::room::auth::make_refs(const auth &a,
 	return call(a, out, t, u);
 }
 
+//
+// room::aliases
+//
+
+size_t
+ircd::m::room::aliases::count()
+const
+{
+	return count(string_view{});
+}
+
+size_t
+ircd::m::room::aliases::count(const string_view &server)
+const
+{
+	size_t ret(0);
+	for_each(server, [&ret](const auto &a)
+	{
+		++ret;
+		return true;
+	});
+
+	return ret;
+}
+
+bool
+ircd::m::room::aliases::has(const alias &alias)
+const
+{
+	return !for_each(alias.host(), [&alias]
+	(const id::room_alias &a)
+	{
+		assert(a.host() == alias.host());
+		return a == alias? false : true; // false to break on found
+	});
+}
+
+bool
+ircd::m::room::aliases::for_each(const closure_bool &closure)
+const
+{
+	const room::state state
+	{
+		room
+	};
+
+	return state.for_each("m.room.aliases", room::state::keys_bool{[this, &closure]
+	(const string_view &state_key)
+	{
+		return for_each(state_key, closure);
+	}});
+}
+
+bool
+ircd::m::room::aliases::for_each(const string_view &server,
+                                 const closure_bool &closure)
+const
+{
+	if(!server)
+		return for_each(closure);
+
+	const room::state state
+	{
+		room
+	};
+
+	const event::idx &event_idx
+	{
+		state.get(std::nothrow, "m.room.aliases", server)
+	};
+
+	if(!event_idx)
+		return true;
+
+	bool ret{true};
+	m::get(std::nothrow, event_idx, "content", [&closure, &ret]
+	(const json::object &content)
+	{
+		const json::array &aliases
+		{
+			content["aliases"]
+		};
+
+		for(auto it(begin(aliases)); it != end(aliases) && ret; ++it)
+		{
+			const json::string &alias(*it);
+			if(!valid(m::id::ROOM_ALIAS, alias))
+				continue;
+
+			if(!closure(alias))
+				ret = false;
+		}
+	});
+
+	return ret;
+}
+
 //
 // room::power
 //

modules/console.cc

@@ -7080,6 +7080,39 @@ console_cmd__room__visible(opt &out, const string_view &line)
 	return true;
 }
 
+bool
+console_cmd__room__aliases(opt &out, const string_view &line)
+{
+	const params param{line, " ",
+	{
+		"room_id", "server"
+	}};
+
+	const auto &room_id
+	{
+		m::room_id(param.at(0))
+	};
+
+	const string_view &server
+	{
+		param["server"]
+	};
+
+	const m::room::aliases aliases
+	{
+		room_id
+	};
+
+	aliases.for_each(server, [&out]
+	(const m::room::alias &alias)
+	{
+		out << alias << std::endl;
+		return true;
+	});
+
+	return true;
+}
+
 bool
 console_cmd__room__members(opt &out, const string_view &line)
 {