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local dt = require "prosody.util.datetime";
local base64 = require "prosody.util.encodings".base64;
local hashes = require "prosody.util.hashes";
local st = require "prosody.util.stanza";
local jid = require "prosody.util.jid";
local array = require "prosody.util.array";
local set = require "prosody.util.set";
local default_host = module:get_option_string("external_service_host", module.host);
local default_port = module:get_option_integer("external_service_port", nil, 1, 65535);
local default_secret = module:get_option_string("external_service_secret");
local default_ttl = module:get_option_period("external_service_ttl", "1 day");
local configured_services = module:get_option_array("external_services", {});
local access = module:get_option_set("external_service_access", {});
-- https://datatracker.ietf.org/doc/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;
else
module:log("warn", "Service missing recommended 'transport' field: %q", item);
end
if type(item.host) == "string" then
srv.host = item.host;
end
if type(item.port) == "number" then
srv.port = item.port;
elseif not srv.port then
module:log("warn", "Service missing recommended 'port' field: %q", item);
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 extras = module:get_host_items("external_service");
local services = ( configured_services + extras ) / prepare;
if #services == 0 then
module:set_status("warn", "No services configured or all had errors");
end
end
module:handle_items("external_service", function(added)
if prepare(added.item) then
module:set_status("core", "OK");
end
end, module.load);
-- 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"));
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", "The 'port' and 'type' attributes are required."));
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);
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