plugins/sasl.lua

local st = require "util.stanza";
local base64 = require "mime".b64;
local xmlns_sasl = "urn:ietf:params:xml:ns:xmpp-sasl";

function verse.plugins.sasl(stream)
	local function handle_features(features_stanza)
		if stream.authenticated then return; end
		stream:debug("Authenticating with SASL...");
		local initial_data = base64("\0"..stream.username.."\0"..stream.password);
	
		--stream.sasl_state, initial_data = sasl_new({"PLAIN"}, stream.username, stream.password, stream.jid);
		
		stream:debug("Selecting PLAIN mechanism...");
		local auth_stanza = st.stanza("auth", { xmlns = xmlns_sasl, mechanism = "PLAIN" });
		if initial_data then
			auth_stanza:text(initial_data);
		end
		stream:send(auth_stanza);
		return true;
	end
	
	local function handle_sasl(sasl_stanza)
		if sasl_stanza.name == "success" then
			stream.authenticated = true;
			stream:event("authentication-success");
		elseif sasl_stanza.name == "failure" then
			local err = sasl_stanza.tags[1];
			stream:event("authentication-failure", { condition = err.name });
		end
		stream:reopen();
		return true;
	end
	
	stream:hook("stream-features", handle_features, 300);
	stream:hook("stream/"..xmlns_sasl, handle_sasl);
	
	return true;
end