view mod_pubsub_alertmanager/mod_pubsub_alertmanager.lua @ 5243:d5dc8edb2695

mod_http_oauth2: Use more compact IDs UUIDs are nice but so verbose! The reduction in entropy for the nonce should be fine since the timestamp is also counts towards this, and it changes every second (modulo clock shenanigans), so the chances of someone managing to get the same client_secret by registering with the same information at the same time as another entity should be negligible.
author Kim Alvefur <zash@zash.se>
date Sat, 11 Mar 2023 22:46:27 +0100
parents adda872fa9e1
children 67190744b1eb
line wrap: on
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local st = require "util.stanza";
local json = require "util.json";
local filters = { --[[ TODO what's useful? ]] };
local render = require "util.interpolation".new("%b{}", tostring, filters);
local uuid_generate = require "util.uuid".generate;

-- TODO alertmanager supports inclusion of HTTP auth and OAuth, worth looking
-- into for using instead of request IP

module:depends("http");

local pubsub_service = module:depends("pubsub").service;

local error_mapping = {
	["forbidden"] = 403;
	["item-not-found"] = 404;
	["internal-server-error"] = 500;
	["conflict"] = 409;
};

local function publish_payload(node, actor, item_id, payload)
	local post_item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = item_id, })
		:add_child(payload);
	local ok, err = pubsub_service:publish(node, actor, item_id, post_item);
	module:log("debug", ":publish(%q, true, %q, %s) -> %q", node, item_id, payload:top_tag(), err or "");
	if not ok then
		return error_mapping[err] or 500;
	end
	return 202;
end

local node_template = module:get_option_string("alertmanager_node_template", "{path?alerts}");

function handle_POST(event, path)
	local request = event.request;

	local payload = json.decode(event.request.body);
	if type(payload) ~= "table" then return 400; end
	if payload.version ~= "4" then return 501; end

	for _, alert in ipairs(payload.alerts) do
		local item = st.stanza("alerts", {xmlns = "urn:uuid:e3bec775-c607-4e9b-9a3f-94de1316d861:v4", status=alert.status});
		for k, v in pairs(alert.annotations) do
			item:text_tag("annotation", v, { name=k });
		end
		for k, v in pairs(alert.labels) do
			item:text_tag("label", v, { name=k });
		end
		item:tag("starts", { at = alert.startsAt}):up();
		if alert.endsAt and alert.status == "resolved" then
			item:tag("ends", { at = alert.endsAt }):up();
		end
		if alert.generatorURL then
			item:tag("link", { href=alert.generatorURL }):up();
		end

		local node = render(node_template, {alert = alert, path = path, payload = payload, request = request});
		local ret = publish_payload(node, request.ip, uuid_generate(), item);
		if ret ~= 202 then
			return ret
		end
	end
	return 202;
end

local template = module:get_option_string("alertmanager_body_template", [[
*ALARM!*
Status: {status}
Starts at: {startsAt}{endsAt&
Ends at: {endsAt}}
Labels: {labels%
  {idx}: {item}}
Annotations: {annotations%
  {idx}: {item}}
]]);

module:hook("pubsub-summary/urn:uuid:e3bec775-c607-4e9b-9a3f-94de1316d861:v4", function(event)
	local payload = event.payload;

	local data = {
		status = payload.attr.status,
		firing = "firing" == payload.attr.status,
		resolved = "resolved" == payload.attr.status,
		annotations = {},
		labels = {},
		endsAt = payload:find("ends/@at"),
		startsAt = payload:find("starts/@at"),
	};
	for label in payload:childtags("label") do
		data.labels[tostring(label.attr.name)] = label:get_text();
	end
	for annotation in payload:childtags("annotation") do
		data.annotations[tostring(annotation.attr.name)] = annotation:get_text();
	end

	return render(template, data);
end);

module:provides("http", {
	route = {
		["POST /*"] = handle_POST;
		["POST"] = handle_POST;
	};
});