view mod_mamsub/mod_mamsub.lua @ 5186:fa3059e653fa

mod_http_oauth2: Implement the Implicit flow Everyone says this is insecure and bad, but it's also the only thing that makes sense for e.g. pure JavaScript clients, but hey implement this even more complicated thing instead!
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:06:50 +0100
parents 0697fbef9134
children
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-- MAM Subscriptions prototype
-- Copyright (C) 2015 Kim Alvefur
--
-- This file is MIT/X11 licensed.

local mt = require"util.multitable";
local st = require"util.stanza";

local xmlns_mamsub = "http://prosody.im/protocol/mamsub";

module:add_feature(xmlns_mamsub);

local host_sessions = prosody.hosts[module.host].sessions;

local weak = { __mode = "k" };

module:hook("iq-set/self/"..xmlns_mamsub..":subscribe", function (event)
	local origin, stanza = event.origin, event.stanza;
	if origin.mamsub ~= nil then
		origin.send(st.error_reply(stanza, "modify", "conflict"));
		return true;
	end
	origin.mamsub = xmlns_mamsub;
	local mamsub_sessions = host_sessions[origin.username].mamsub_sessions;
	if not mamsub_sessions then
		mamsub_sessions = setmetatable({}, weak);
		host_sessions[origin.username].mamsub_sessions = mamsub_sessions;
	end
	mamsub_sessions[origin] = true;
	origin.send(st.reply(stanza));
	return true;
end);

module:hook("iq-set/self/"..xmlns_mamsub..":unsubscribe", function (event)
	local origin, stanza = event.origin, event.stanza;
	if origin.mamsub ~= xmlns_mamsub then
		origin.send(st.error_reply(stanza, "modify", "conflict"));
		return true;
	end
	origin.mamsub = nil;
	local mamsub_sessions = host_sessions[origin.username].mamsub_sessions;
	if mamsub_sessions then
		mamsub_sessions[origin] = nil;
	end
	origin.send(st.reply(stanza));
	return true;
end);

module:hook("archive-message-added", function (event)
	local user_session = host_sessions[event.for_user];
	local mamsub_sessions = user_session and user_session.mamsub_sessions;
	if not mamsub_sessions then return end;

	local for_broadcast = st.message():tag("mamsub", { xmlns = xmlns_mamsub })
		:tag("forwarded", { xmlns = "urn:xmpp:forward:0" })
			:add_child(event.stanza);

	for session in pairs(mamsub_sessions) do
		if session.mamsub == xmlns_mamsub then
			for_broadcast.attr.to = session.full_jid;
			session.send(for_broadcast);
		end
	end
end);