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 array = require "util.array";
local base64 = require "util.encodings".base64;
local valid_utf8 = require "util.encodings".utf8.valid;
local have_crypto, crypto = pcall(require, "util.crypto");
local jid = require "util.jid";
local json = require "util.json";
local random = require "util.random";
local set = require "util.set";
local st = require "util.stanza";

if not have_crypto then
	local ossl_ciphers = require "openssl.cipher";
	crypto = {};
	-- FIXME: luaossl does not expose the EVP_CTRL_GCM_GET_TAG API, so we append 16 NUL bytes
	-- Siskin does not validate the tag anyway.
	function crypto.aes_128_gcm_encrypt(key, iv, message)
		return ossl_ciphers.new("AES-128-GCM"):encrypt(key, iv):final(message)..string.rep("\0", 16);
	end
end

local xmlns_jmi = "urn:xmpp:jingle-message:0";
local xmlns_jingle_apps_rtp = "urn:xmpp:jingle:apps:rtp:1";
local xmlns_push = "urn:xmpp:push:0";
local xmlns_push_encrypt = "tigase:push:encrypt:0";
local xmlns_push_encrypt_aes_128_gcm = "tigase:push:encrypt:aes-128-gcm";
local xmlns_push_jingle = "tigase:push:jingle:0";

local function detect_stanza_encryption(stanza)
	local eme = stanza:get_child("encryption", "urn:xmpp:eme:0");
	if eme then return eme.attr.namespace or ""; end
	-- Fallback for legacy OMEMO clients without EME
	local omemo = stanza:get_child("encrypted", "eu.siacs.conversations.axolotl");
	if omemo then return "eu.siacs.conversations.axolotl"; end
end

-- https://xeps.tigase.net//docs/push-notifications/encrypt/#41-discovering-support
local function account_disco_info(event)
	event.reply:tag("feature", {var=xmlns_push_encrypt}):up();
	event.reply:tag("feature", {var=xmlns_push_encrypt_aes_128_gcm}):up();
	event.reply:tag("feature", {var=xmlns_push_jingle}):up();
end
module:hook("account-disco-info", account_disco_info);

function handle_register(event)
	local encrypt = event.stanza:get_child("enable", xmlns_push):get_child("encrypt", xmlns_push_encrypt);
	if not encrypt then return; end

	local algorithm = encrypt.attr.alg;
	if algorithm ~= "aes-128-gcm" then
		event.origin.send(st.error_reply(
			event.stanza, "modify", "feature-not-implemented", "Unknown encryption algorithm"
		));
		return false;
	end

	local key_base64 = encrypt:get_text();
	local key_binary = base64.decode(key_base64);
	if not key_binary or #key_binary ~= 16 then
		event.origin.send(st.error_reply(
			event.stanza, "modify", "bad-request", "Invalid encryption key"
		));
		return false;
	end

	module:log("debug", "Encrypted push notifications enabled");

	event.push_info.encryption = {
		algorithm = algorithm;
		key_base64 = key_base64;
	};
end

function handle_push(event)
	local encryption = event.push_info.encryption;
	if not encryption then
		module:log("debug", "Encryption not enabled for this notification");
		return;
	end

	if encryption.algorithm ~= "aes-128-gcm" then
		event.reason = "Unsupported encryption algorithm: "..tostring(encryption.algorithm);
		return true;
	end

	local push_summary = event.push_summary;

	local original_stanza = event.original_stanza;
	local is_encrypted_msg = detect_stanza_encryption(original_stanza);
	local body;
	if is_encrypted_msg then
		-- TODO: localization
		body = "You have received an encrypted message";
	else
		body = original_stanza:get_child_text("body");
		if body and #body > 255 then
			body = body:sub(1, 255);
			if not valid_utf8(body) then
				body = body:gsub("[\194-\244][\128-\191]*$", "");
			end
		end
	end

	local push_payload = {
		unread = tonumber(push_summary["message-count"]) or 1;
		sender = jid.bare(original_stanza.attr.from);
		message = body;
	};

	if original_stanza.name == "message" then
		if original_stanza.attr.type == "groupchat" then
			push_payload.type = "groupchat";
			push_payload.nickname = jid.resource(original_stanza.attr.from);
		elseif original_stanza.attr.type ~= "error" then
			local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
			if jmi_propose then
				push_payload.type = "call";
				push_payload.sid = jmi_propose.attr.id;
				local media_types = set.new();
				for description in jmi_propose:childtags("description", xmlns_jingle_apps_rtp) do
					local media_type = description.attr.media;
					if media_type then
						media_types:add(media_type);
					end
				end
				push_payload.media = array.collect(media_types:items());
				push_payload.sender = original_stanza.attr.from;
			else
				push_payload.type = "chat";
			end
		end
	elseif original_stanza.name == "presence"
	and original_stanza.attr.type == "subscribe" then
		push_payload.type = "subscribe";
	end

	local iv = random.bytes(12);
	local key_binary = base64.decode(encryption.key_base64);
	local push_json = json.encode(push_payload);

	local encrypted_payload = base64.encode(crypto.aes_128_gcm_encrypt(key_binary, iv, push_json));
	local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
		:text(encrypted_payload);
	if push_payload.type == "call" then
		encrypted_element.attr.type = "voip";
		event.important = true;
	end
	-- Replace the unencrypted notification data with the encrypted one
	event.notification_payload
		:remove_children("x", "jabber:x:data")
		:add_child(encrypted_element);

	module:log("debug", "Encrypted '%s' push notification using %s", push_payload.type, encryption.algorithm);
end

module:depends("cloud_notify");
module:hook("cloud_notify/registration", handle_register);
module:hook("cloud_notify/push", handle_push, 1);