# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1623194086 -7200
# Node ID 48132b6e1b1687d019b26906faf5d11e8be7bdb5
# Parent  260a33eabbd33ada86eff6cb090d8455fbd5ea1b
mod_pubsub_alertmanager: Publish Alertmanager alerts into pubsub

For integration with other things as pubsub subscribers.

diff -r 260a33eabbd3 -r 48132b6e1b16 mod_pubsub_alertmanager/mod_pubsub_alertmanager.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_pubsub_alertmanager/mod_pubsub_alertmanager.lua	Wed Jun 09 01:14:46 2021 +0200
@@ -0,0 +1,62 @@
+local st = require "util.stanza";
+local json = require "util.json";
+local uuid_generate = require "util.uuid".generate;
+
+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
+
+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 then
+			item:tag("ends", { at = alert.endsAt }):up();
+		end
+		if alert.generatorURL then
+			item:tag("link", { href=alert.generatorURL }):up();
+		end
+
+		local ret = publish_payload(path, request.ip, uuid_generate(), item);
+		if ret ~= 202 then
+			return ret
+		end
+	end
+	return 202;
+end
+
+module:provides("http", {
+	route = {
+		["POST /*"] = handle_POST;
+	};
+});