File

mod_easy_invite/mod_easy_invite.lua @ 4764:a754f7e380b2

mod_dnsupdate: Rewrite port config vs DNS comparison code I'm not sure if it was correct, which means it was hard to understand and thus needed to be simplified. Hope this accomplishes that.
author Kim Alvefur <zash@zash.se>
date Mon, 08 Nov 2021 23:03:14 +0100
parent 4088:439ae12bb136
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-- XEP-0401: Easy User Onboarding
local dataforms = require "util.dataforms";
local datetime = require "util.datetime";
local jid_bare = require "util.jid".bare;
local jid_split = require "util.jid".split;
local split_jid = require "util.jid".split;
local rostermanager = require "core.rostermanager";
local modulemanager = require "core.modulemanager";
local st = require "util.stanza";

local invite_only = module:get_option_boolean("registration_invite_only", true);
local require_encryption = module:get_option_boolean("c2s_require_encryption",
	module:get_option_boolean("require_encryption", false));

local new_adhoc = module:require("adhoc").new;

-- Whether local users can invite other users to create an account on this server
local allow_user_invites = module:get_option_boolean("allow_user_invites", true);

local invites;
if prosody.shutdown then -- COMPAT hack to detect prosodyctl
	invites = module:depends("invites");
end

local invite_result_form = dataforms.new({
		title = "Your Invite",
		-- TODO instructions = something helpful
		{
			name = "uri";
			label = "Invite URI";
			-- TODO desc = something helpful
		},
		{
			name = "url" ;
			var = "landing-url";
			label = "Invite landing URL";
		},
		{
			name = "expire";
			label = "Token valid until";
		},
	});

module:depends("adhoc");
module:provides("adhoc", new_adhoc("New Invite", "urn:xmpp:invite#invite",
		function (_, data)
			local username = split_jid(data.from);
			local invite = invites.create_contact(username, allow_user_invites);
			--TODO: check errors
			return {
				status = "completed";
				form = {
					layout = invite_result_form;
					values = {
						uri = invite.uri;
						url = invite.landing_page;
						expire = datetime.datetime(invite.expires);
					};
				};
			};
		end, "local_user"));


-- TODO
-- module:provides("adhoc", new_adhoc("Create account", "urn:xmpp:invite#create-account", function () end, "admin"));

-- XEP-0379: Pre-Authenticated Roster Subscription
module:hook("presence/bare", function (event)
	local stanza = event.stanza;
	if stanza.attr.type ~= "subscribe" then return end

	local preauth = stanza:get_child("preauth", "urn:xmpp:pars:0");
	if not preauth then return end
	local token = preauth.attr.token;
	if not token then return end

	local username, host = jid_split(stanza.attr.to);

	local invite, err = invites.get(token, username);

	if not invite then
		module:log("debug", "Got invalid token, error: %s", err);
		return;
	end

	local contact = jid_bare(stanza.attr.from);

	module:log("debug", "Approving inbound subscription to %s from %s", username, contact);
	if rostermanager.set_contact_pending_in(username, host, contact, stanza) then
		if rostermanager.subscribed(username, host, contact) then
			invite:use();
			rostermanager.roster_push(username, host, contact);

			-- Send back a subscription request (goal is mutual subscription)
			if not rostermanager.is_user_subscribed(username, host, contact)
			and not rostermanager.is_contact_pending_out(username, host, contact) then
				module:log("debug", "Sending automatic subscription request to %s from %s", contact, username);
				if rostermanager.set_contact_pending_out(username, host, contact) then
					rostermanager.roster_push(username, host, contact);
					module:send(st.presence({type = "subscribe", to = contact }));
				else
					module:log("warn", "Failed to set contact pending out for %s", username);
				end
			end
		end
	end
end, 1);

-- TODO sender side, magic automatic mutual subscription

local invite_stream_feature = st.stanza("register", { xmlns = "urn:xmpp:invite" }):up();
module:hook("stream-features", function(event)
	local session, features = event.origin, event.features;

	-- Advertise to unauthorized clients only.
	if session.type ~= "c2s_unauthed" or (require_encryption and not session.secure) then
		return
	end

	features:add_child(invite_stream_feature);
end);

-- Client is submitting a preauth token to allow registration
module:hook("stanza/iq/urn:xmpp:pars:0:preauth", function(event)
	local preauth = event.stanza.tags[1];
	local token = preauth.attr.token;
	local validated_invite = invites.get(token);
	if not validated_invite then
		local reply = st.error_reply(event.stanza, "cancel", "forbidden", "The invite token is invalid or expired");
		event.origin.send(reply);
		return true;
	end
	event.origin.validated_invite = validated_invite;
	local reply = st.reply(event.stanza);
	event.origin.send(reply);
	return true;
end);

-- Registration attempt - ensure a valid preauth token has been supplied
module:hook("user-registering", function (event)
	local validated_invite = event.validated_invite or (event.session and event.session.validated_invite);
	if invite_only and not validated_invite then
		event.allowed = false;
		event.reason = "Registration on this server is through invitation only";
		return;
	end
	if validated_invite.additional_data and validated_invite.additional_data.allow_reset then
		event.allow_reset = validated_invite.additional_data.allow_reset;
	end
end);

-- Make a *one-way* subscription. User will see when contact is online,
-- contact will not see when user is online.
function subscribe(host, user_username, contact_username)
	local user_jid = user_username.."@"..host;
	local contact_jid = contact_username.."@"..host;
	-- Update user's roster to say subscription request is pending...
	rostermanager.set_contact_pending_out(user_username, host, contact_jid);
	-- Update contact's roster to say subscription request is pending...
	rostermanager.set_contact_pending_in(contact_username, host, user_jid);
	-- Update contact's roster to say subscription request approved...
	rostermanager.subscribed(contact_username, host, user_jid);
	-- Update user's roster to say subscription request approved...
	rostermanager.process_inbound_subscription_approval(user_username, host, contact_jid);
end

-- Make a mutual subscription between jid1 and jid2. Each JID will see
-- when the other one is online.
function subscribe_both(host, user1, user2)
	subscribe(host, user1, user2);
	subscribe(host, user2, user1);
end

-- Registration successful, if there was a preauth token, mark it as used
module:hook("user-registered", function (event)
	local validated_invite = event.validated_invite or (event.session and event.session.validated_invite);
	if not validated_invite then
		return;
	end
	local inviter_username = validated_invite.inviter;
	local contact_username = event.username;
	validated_invite:use();

	if inviter_username then
		module:log("debug", "Creating mutual subscription between %s and %s", inviter_username, contact_username);
		subscribe_both(module.host, inviter_username, contact_username);
	end

	if validated_invite.additional_data then
		module:log("debug", "Importing roles from invite");
		local roles = validated_invite.additional_data.roles;
		if roles then
			module:open_store("roles"):set(contact_username, roles);
		end
	end
end);

-- Equivalent of user-registered but for when the account already existed
-- (i.e. password reset)
module:hook("user-password-reset", function (event)
	local validated_invite = event.validated_invite or (event.session and event.session.validated_invite);
	if not validated_invite then
		return;
	end
	validated_invite:use();
end);

do
	-- Telnet command
	-- Since the telnet console is global this overwrites the command for
	-- each host it's loaded on, but this should be fine.

	local get_module = require "core.modulemanager".get_module;

	local console_env = module:shared("/*/admin_telnet/env");

	-- luacheck: ignore 212/self
	console_env.invite = {};
	function console_env.invite:create_account(user_jid)
		local username, host = jid_split(user_jid);
		local mod_invites, err = get_module(host, "invites");
		if not mod_invites then return nil, err or "mod_invites not loaded on this host"; end
		local invite, err = mod_invites.create_account(username);
		if not invite then return nil, err; end
		return true, invite.uri;
	end

	function console_env.invite:create_contact(user_jid, allow_registration)
		local username, host = jid_split(user_jid);
		local mod_invites, err = get_module(host, "invites");
		if not mod_invites then return nil, err or "mod_invites not loaded on this host"; end
		local invite, err = mod_invites.create_contact(username, allow_registration);
		if not invite then return nil, err; end
		return true, invite.uri;
	end
end

local sm = require "core.storagemanager";
function module.command(arg)
	if #arg < 2 or arg[2] ~= "generate" then
		print("usage: prosodyctl mod_easy_invite example.net generate");
		return;
	end

	local host = arg[1];
	assert(hosts[host], "Host "..tostring(host).." does not exist");
	sm.initialize_host(host);

	-- Load mod_invites
	invites = module:context(host):depends("invites");
	local invites_page_module = module:context(host):get_option_string("easy_invite_page_module", "invites_page");
	if modulemanager.get_modules_for_host(host):contains(invites_page_module) then
		module:context(host):depends(invites_page_module);
	end

	table.remove(arg, 1);
	table.remove(arg, 1);

	local invite, roles;
	if arg[1] == "--reset" then
		local nodeprep = require "util.encodings".stringprep.nodeprep;
		local username = nodeprep(arg[2]);
		if not username then
			print("Please supply a valid username to generate a reset link for");
			return;
		end
		invite = invites.create_account_reset(username);
	else
		if arg[1] == "--admin" then
			roles = { ["prosody:admin"] = true };
		elseif arg[1] == "--role" then
			roles = { [arg[2]] = true };
		end
		invite = invites.create_account(nil, { roles = roles });
	end

	print(invite.landing_page or invite.uri);
end