modules/client: Add capabilities endpoint.

modules/Makefile.am

@@ -166,6 +166,7 @@ client_client_initialsync_la_SOURCES = client/initialsync.cc
 client_client_search_la_SOURCES = client/search.cc
 client_client_joined_groups_la_SOURCES = client/joined_groups.cc
 client_client_register_available_la_SOURCES = client/register_available.cc
+client_client_capabilities_la_SOURCES = client/capabilities.cc
 
 client_module_LTLIBRARIES = \
 	client/client_versions.la \
@@ -188,6 +189,7 @@ client_module_LTLIBRARIES = \
 	client/client_search.la \
 	client/client_joined_groups.la \
 	client/client_register_available.la \
+	client/client_capabilities.la \
 	###
 
 #

modules/client/capabilities.cc

@@ -0,0 +1,70 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2018 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.
+
+using namespace ircd;
+
+mapi::header
+IRCD_MODULE
+{
+	"Client 6 :Capabilities Negotiation"
+};
+
+resource
+capabilities_resource
+{
+	"/_matrix/client/r0/capabilities",
+	{
+		"(6.1) Gets information about the server's supported feature "
+		"set and other relevant capabilities. ",
+	}
+};
+
+resource::response
+get__capabilities(client &client, const resource::request &request)
+{
+	const bool m_change_password__enabled
+	{
+		mods::loaded("client_account")
+	};
+
+	return resource::response
+	{
+		client, json::members
+		{
+			{ "capabilities", json::members
+			{
+				{ "m.change_password", json::members
+				{
+					{ "enabled", m_change_password__enabled },
+				}},
+				{ "m.room_version", json::members
+				{
+					{ "default", "1" },
+					{ "available", json::members
+					{
+						{ "1", "stable"    },
+						{ "2", "unstable"  },
+						{ "3", "unstable"  },
+					}},
+				}},
+			}},
+		},
+	};
+}
+
+resource::method
+get_method
+{
+	capabilities_resource, "GET", get__capabilities,
+	{
+		get_method.REQUIRES_AUTH |
+		get_method.RATE_LIMITED
+	}
+};