1 files changed, 239 insertions, 0 deletions
diff --git a/plugins/mod_external_services.lua b/plugins/mod_external_services.lua
new file mode 100644
index 00000000..6b46f890
--- /dev/null
+++ b/plugins/mod_external_services.lua
@@ -0,0 +1,239 @@
+
+local dt = require "util.datetime";
+local base64 = require "util.encodings".base64;
+local hashes = require "util.hashes";
+local st = require "util.stanza";
+local jid = require "util.jid";
+local array = require "util.array";
+local set = require "util.set";
+
+local default_host = module:get_option_string("external_service_host", module.host);
+local default_port = module:get_option_number("external_service_port");
+local default_secret = module:get_option_string("external_service_secret");
+local default_ttl = module:get_option_number("external_service_ttl", 86400);
+
+local configured_services = module:get_option_array("external_services", {});
+
+local access = module:get_option_set("external_service_access", {});
+
+-- https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
+local function behave_turn_rest_credentials(srv, item, secret)
+	local ttl = default_ttl;
+	if type(item.ttl) == "number" then
+		ttl = item.ttl;
+	end
+	local expires = srv.expires or os.time() + ttl;
+	local username;
+	if type(item.username) == "string" then
+		username = string.format("%d:%s", expires, item.username);
+	else
+		username = string.format("%d", expires);
+	end
+	srv.username = username;
+	srv.password = base64.encode(hashes.hmac_sha1(secret, srv.username));
+end
+
+local algorithms = {
+	turn = behave_turn_rest_credentials;
+}
+
+-- filter config into well-defined service records
+local function prepare(item)
+	if type(item) ~= "table" then
+		module:log("error", "Service definition is not a table: %q", item);
+		return nil;
+	end
+
+	local srv = {
+		type = nil;
+		transport = nil;
+		host = default_host;
+		port = default_port;
+		username = nil;
+		password = nil;
+		restricted = nil;
+		expires = nil;
+	};
+
+	if type(item.type) == "string" then
+		srv.type = item.type;
+	else
+		module:log("error", "Service missing mandatory 'type' field: %q", item);
+		return nil;
+	end
+	if type(item.transport) == "string" then
+		srv.transport = item.transport;
+	end
+	if type(item.host) == "string" then
+		srv.host = item.host;
+	end
+	if type(item.port) == "number" then
+		srv.port = item.port;
+	end
+	if type(item.username) == "string" then
+		srv.username = item.username;
+	end
+	if type(item.password) == "string" then
+		srv.password = item.password;
+		srv.restricted = true;
+	end
+	if item.restricted == true then
+		srv.restricted = true;
+	end
+	if type(item.expires) == "number" then
+		srv.expires = item.expires;
+	elseif type(item.ttl) == "number" then
+		srv.expires = os.time() + item.ttl;
+	end
+	if (item.secret == true and default_secret) or type(item.secret) == "string" then
+		local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
+		local secret = item.secret;
+		if secret == true then
+			secret = default_secret;
+		end
+		if secret_cb then
+			secret_cb(srv, item, secret);
+			srv.restricted = true;
+		end
+	end
+	return srv;
+end
+
+function module.load()
+	-- Trigger errors on startup
+	local extras = module:get_host_items("external_service");
+	local services = ( configured_services + extras ) / prepare;
+	if #services == 0 then
+		module:set_status("warn", "No services configured or all had errors");
+	end
+end
+
+module:handle_items("external_service", function(added)
+	if prepare(added.item) then
+		module:set_status("core", "OK");
+	end
+end, module.load);
+
+-- Ensure only valid items are added in events
+local services_mt = {
+	__index = getmetatable(array()).__index;
+	__newindex = function (self, i, v)
+		rawset(self, i, assert(prepare(v), "Invalid service entry added"));
+	end;
+}
+
+function get_services()
+	local extras = module:get_host_items("external_service");
+	local services = ( configured_services + extras ) / prepare;
+
+	setmetatable(services, services_mt);
+
+	return services;
+end
+
+function services_xml(services, name, namespace)
+	local reply = st.stanza(name or "services", { xmlns = namespace or "urn:xmpp:extdisco:2" });
+
+	for _, srv in ipairs(services) do
+		reply:tag("service", {
+				type = srv.type;
+				transport = srv.transport;
+				host = srv.host;
+				port = srv.port and string.format("%d", srv.port) or nil;
+				username = srv.username;
+				password = srv.password;
+				expires = srv.expires and dt.datetime(srv.expires) or nil;
+				restricted = srv.restricted and "1" or nil;
+			}):up();
+	end
+
+	return reply;
+end
+
+local function handle_services(event)
+	local origin, stanza = event.origin, event.stanza;
+	local action = stanza.tags[1];
+
+	local user_bare = jid.bare(stanza.attr.from);
+	local user_host = jid.host(user_bare);
+	if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
+		origin.send(st.error_reply(stanza, "auth", "forbidden"));
+		return true;
+	end
+
+	local services = get_services();
+
+	local requested_type = action.attr.type;
+	if requested_type then
+		services:filter(function(item)
+			return item.type == requested_type;
+		end);
+	end
+
+	module:fire_event("external_service/services", {
+			origin = origin;
+			stanza = stanza;
+			requested_type = requested_type;
+			services = services;
+		});
+
+	local reply = st.reply(stanza):add_child(services_xml(services, action.name, action.attr.xmlns));
+
+	origin.send(reply);
+	return true;
+end
+
+local function handle_credentials(event)
+	local origin, stanza = event.origin, event.stanza;
+	local action = stanza.tags[1];
+
+	if origin.type ~= "c2s" then
+		origin.send(st.error_reply(stanza, "auth", "forbidden", "The 'port' and 'type' attributes are required."));
+		return true;
+	end
+
+	local services = get_services();
+	services:filter(function (item)
+		return item.restricted;
+	end)
+
+	local requested_credentials = set.new();
+	for service in action:childtags("service") do
+		if not service.attr.type or not service.attr.host then
+			origin.send(st.error_reply(stanza, "modify", "bad-request"));
+			return true;
+		end
+
+		requested_credentials:add(string.format("%s:%s:%d", service.attr.type, service.attr.host,
+			tonumber(service.attr.port) or 0));
+	end
+
+	module:fire_event("external_service/credentials", {
+			origin = origin;
+			stanza = stanza;
+			requested_credentials = requested_credentials;
+			services = services;
+		});
+
+	services:filter(function (srv)
+		local port_key = string.format("%s:%s:%d", srv.type, srv.host, srv.port or 0);
+		local portless_key = string.format("%s:%s:%d", srv.type, srv.host, 0);
+		return requested_credentials:contains(port_key) or requested_credentials:contains(portless_key);
+	end);
+
+	local reply = st.reply(stanza):add_child(services_xml(services, action.name, action.attr.xmlns));
+
+	origin.send(reply);
+	return true;
+end
+
+-- XEP-0215 v0.7
+module:add_feature("urn:xmpp:extdisco:2");
+module:hook("iq-get/host/urn:xmpp:extdisco:2:services", handle_services);
+module:hook("iq-get/host/urn:xmpp:extdisco:2:credentials", handle_credentials);
+
+-- COMPAT XEP-0215 v0.6
+-- Those still on the old version gets to deal with undefined attributes until they upgrade.
+module:add_feature("urn:xmpp:extdisco:1");
+module:hook("iq-get/host/urn:xmpp:extdisco:1:services", handle_services);
+module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);