mod_voipms: New Module to send and receive SMS/MMS via VoIP.ms APIs. diff --git a/mod_voipms/README.md b/mod_voipms/README.md new file mode 100644 --- /dev/null +++ b/mod_voipms/README.md @@ -0,0 +1,51 @@ +--- +labels: +- 'Stage-Alpha' +- 'Type-Web' +summary: Send and receive SMS/MMS via VoIP.ms APIs. +rockspec: + build: + modules: + mod_voipms: mod_voipms.lua +... + +Introduction +============ + +This is a Prosody module to map JIDs to DIDs on VoIP.ms and support sending/receiving SMS/MMS. + +Configuration +============= + +| option | type | default | +|-----------------------|--------|---------| +| voipms\_api\_username | string | nil | +| voipms\_api\_password | string | nil | +| voipms\_query\_key | string | nil | +| voipms\_jid\_map | table | nil | +``` +VirtualHost "sms.example.com" +modules_enabled = { + "voipms"; +} +voipms_api_username = john@example.com -- E-mail registered with VoIP.ms +voipms_api_password = abcd1234 -- API password configured in VoIP.ms +voipms_query_key = some_query_key -- query param 'key' part of your URL callback +voipms_jid_map = { + ["your_jid@your_domain.com"] = "+1234567890" +} +``` + +HTTP +==== + +The module is served on Prosody's default HTTP ports at the path /voipms. More details on configuring HTTP modules in Prosody can be found in the HTTP documentation. + +VoIP.ms Webhook URL +=================== + +This module receives the VoIP.ms Webhook URL (POST) at the /voipms endpoint. It uses the sendSMS/sendMMS GET methods against the VoIP.ms APIs. This is an example webhook to use in VoIP.ms: + +``` +https://sms.example.com/voipms?key=some_query_key +``` diff --git a/mod_voipms/mod_voipms.lua b/mod_voipms/mod_voipms.lua new file mode 100644 --- /dev/null +++ b/mod_voipms/mod_voipms.lua @@ -0,0 +1,166 @@ +local http = require "net.http" +local json = require "util.json" +local st = require "util.stanza" + +local api_username = module:get_option_string("voipms_api_username") +local api_password = module:get_option_string("voipms_api_password") +local query_key = module:get_option("voipms_query_key") +local jid_map = module:get_option("voipms_jid_map") or {} +local rest_endpoint = "https://voip.ms/api/v1/rest.php" + +if not api_username or not api_password or not query_key then + module:log("error", "Missing required config values (voipms_api_username, voipms_api_password, voipms_query_key)") + return +end + +module:depends("http") + +local function normalize_number(num) + if not num then return nil end + if num:sub(1, 1) ~= "+" then + return "+1" .. num + end + return num +end + +local function extract_query_key(event) + return (event.request.url.query or ""):match("key=([^&]+)") +end + +module:provides("http", { + route = { + ["POST"] = function(event) + local req = event.request + local body = req.body or "" + + if extract_query_key(event) ~= query_key then + module:log("warn", "Unauthorized webhook: missing or invalid key") + return { status_code = 403 } + end + + local json_payload, err = json.decode(body) + if not json_payload then + module:log("warn", "Invalid JSON: %s", err or "unknown error") + return { status_code = 400 } + end + + local payload = json_payload.data and json_payload.data.payload + if not payload then + module:log("warn", "Missing payload in JSON") + return { status_code = 400 } + end + + local from = payload.from and payload.from.phone_number + local to_list = payload.to or {} + local to = #to_list > 0 and to_list[1].phone_number or nil + + if not from or not to then + module:log("warn", "Missing phone numbers (from: %s, to: %s)", tostring(from), tostring(to)) + return { status_code = 400 } + end + + local normalized_to = normalize_number(to) + local target_jid = nil + + for jid, did in pairs(jid_map) do + if normalize_number(did) == normalized_to then + target_jid = jid + break + end + end + + if not target_jid then + module:log("warn", "No JID mapping for DID %s", normalized_to) + return { status_code = 404 } + end + + local normalized_from = normalize_number(from) + local message_text = payload.text or "" + + local message = st.message({ + from = normalized_from .. "@" .. module.host, + to = target_jid, + type = "chat" + }):tag("body"):text(message_text):up() + + if payload.media and #payload.media > 0 then + for _, media_item in ipairs(payload.media) do + if media_item.url then + message_text = message_text .. "\n" .. media_item.url + message:tag("x", { xmlns = "jabber:x:oob" }) + :tag("url"):text(media_item.url):up():up() + end + end + end + + module:send(message) + module:log("info", "Delivered SMS from %s to %s", normalized_from, target_jid) + + return { status_code = 204 } + end + } +}) + +module:hook("message/bare", function(event) + local stanza = event.stanza + if stanza.attr.type ~= "chat" then return end + + local from_jid = stanza.attr.from + local to_jid = stanza.attr.to + local body = stanza:get_child_text("body") + if not body or body == "" then return end + + local from_number = jid_map[from_jid] + if not from_number then + module:log("warn", "No DID mapping for JID %s", from_jid) + return + end + + local to_number = to_jid:match("^([^@]+)") + if not to_number then + module:log("warn", "Malformed JID in message.to: %s", to_jid) + return + end + + to_number = normalize_number(to_number) + + local media_urls = {} + for line in body:gmatch("[^\r\n]+") do + if line:match("^https?://") then + table.insert(media_urls, line) + end + end + + local method = (#media_urls > 0) and "sendMMS" or "sendSMS" + local query = { + api_username = api_username, + api_password = api_password, + method = method, + did = from_number, + dst = to_number, + message = body + } + + if method == "sendMMS" then + for i, url in ipairs(media_urls) do + query["media_url[" .. (i - 1) .. "]"] = url + end + end + + local query_str = http.formencode(query) + + http.request(rest_endpoint .. "?" .. query_str, { + method = "GET"; + }, function(response_body, code) + if code == 200 then + local resp, err = json.decode(response_body) + if not resp or resp.status ~= "success" then + module:log("error", "Failed to send %s: %s", method, err or (resp and resp.status) or "unknown") + else + module:log("info", "Sent %s from %s to %s", method, from_number, to_number) + end + else + module:log("error", "HTTP error sending %s: code %s", method, tostring(code)) + end + end) +end)

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 services = configured_services / prepare;
	if #services == 0 then
		module:log("warn", "No services configured or all had errors");
	end
end

-- 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);