From 109272df595b8d80c8301d92a734c0a369e11bae Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom@tomsmeding.com>
Date: Thu, 17 Oct 2024 21:29:31 +0200
Subject: Add max-age cache control for matrix well-known files

---
 webserver.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/webserver.js b/webserver.js
index 39f2410..a6d9c6f 100755
--- a/webserver.js
+++ b/webserver.js
@@ -198,7 +198,12 @@ function anyComponentHidden(fname) {
 
 // if 'mime' is not null/undefined, it should be the content-type of the file
 // options:
-//   { mime: "content-type value", listdirs: true/false, cors: true/false }
+//   {
+//     mime: "content-type value",
+//     listdirs: true/false,
+//     cors: true/false,
+//     cache: "cache-control value"
+//   }
 // (defaults are null/false)
 function requestFile(req, res, path, origpath, options) {
 	if (options == null) options = {};
@@ -213,6 +218,7 @@ function requestFile(req, res, path, origpath, options) {
 		const headers = {};
 		if (options.mime != null) headers["content-type"] = options.mime;
 		if (options.cors == true) headers["access-control-allow-origin"] = "*";
+		if (options.cache != null) headers["cache-control"] = options.cache;
 		res.sendFile(fname, {headers});
 	} else if (stats.isDirectory() && options.listdirs) {
 		const items = fs
@@ -277,7 +283,9 @@ app.get(["/ff", "/ff/*"], function (req, res) {
 });
 
 app.get("/.well-known/matrix/*", function (req, res) {
-	requestFile(req, res, "/well-known" + unescape(makeUrlSafe(req, 12)), req.url, {mime: "application/json", cors: true});
+	// Prevent these matrix files from being requested for every trifling event
+	// by giving them an explicit cache lifetime
+	requestFile(req, res, "/well-known" + unescape(makeUrlSafe(req, 12)), req.url, {mime: "application/json", cors: true, cache: "public, max-age=7200"});
 });
 
 app.get("/.well-known/*", function (req, res) {
-- 
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