From c5426292649c917a3b33c5b9584f7925a5b6761a Mon Sep 17 00:00:00 2001
From: Philipp Rothmann <philipprothmann@posteo.de>
Date: Wed, 6 Apr 2022 12:57:41 +0200
Subject: [PATCH] add SERVE_SERVER_WELLKNOWN variable

This config allows matrix-synapse to create a endpoint on
$DOMAIN/.well-known/matrix/server used for federation.
It's a straight forward way (no port opening required)
to enable federation if you are okay having a subdomain
(matrix.example.org) as your homeserver address.
---
 .env.sample          | 3 +++
 compose.yml          | 1 +
 homeserver.yaml.tmpl | 2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/.env.sample b/.env.sample
index a1daca8..d3dfcc4 100644
--- a/.env.sample
+++ b/.env.sample
@@ -15,6 +15,9 @@ COMPOSE_FILE="compose.yml"
 
 #DISABLE_FEDERATION=1
 
+# Set "true" to enable federation endpoint on $DOMAIN/.well-known/matrix/server
+SERVE_SERVER_WELLKNOWN=false 
+
 ENABLE_REGISTRATION=false
 PASSWORD_LOGIN_ENABLED=true
 
diff --git a/compose.yml b/compose.yml
index fa7fccd..8b8dcf4 100644
--- a/compose.yml
+++ b/compose.yml
@@ -25,6 +25,7 @@ services:
       - PASSWORD_LOGIN_ENABLED
       - REDACTION_RETENTION_PERIOD
       - ROOT_LOG_LEVEL
+      - SERVE_SERVER_WELLKNOWN
       - SQL_LOG_LEVEL
       - STACK_NAME
       - SYNAPSE_ADMIN_EMAIL
diff --git a/homeserver.yaml.tmpl b/homeserver.yaml.tmpl
index 0d93752..7fa0752 100644
--- a/homeserver.yaml.tmpl
+++ b/homeserver.yaml.tmpl
@@ -85,7 +85,7 @@ public_baseurl: https://{{ env "DOMAIN" }}/
 #
 # Defaults to 'false'.
 #
-#serve_server_wellknown: true
+serve_server_wellknown: {{ env "SERVE_SERVER_WELLKNOWN" }}
 
 # Set the soft limit on the number of file descriptors synapse can use
 # Zero is used to indicate synapse should set the soft limit to the