Reverse-proxy to Synapse via matrix-synapse-reverse-proxy-companion

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2090

roles/custom/matrix-synapse-reverse-proxy-companion/templates/nginx/nginx.conf.j2

@@ -0,0 +1,66 @@
+#jinja2: lstrip_blocks: "True"
+# This is a custom nginx configuration file that we use in the container (instead of the default one),
+# because it allows us to run nginx with a non-root user.
+#
+# For this to work, the default vhost file (`/etc/nginx/conf.d/default.conf`) also needs to be removed.
+#
+# The following changes have been done compared to a default nginx configuration file:
+# - various temp paths are changed to `/tmp`, so that a non-root user can write to them
+# - the `user` directive was removed, as we don't want nginx to switch users
+
+worker_processes {{ matrix_synapse_reverse_proxy_companion_worker_processes }};
+error_log /var/log/nginx/error.log warn;
+pid /tmp/nginx.pid;
+{% for configuration_block in matrix_synapse_reverse_proxy_companion_additional_configuration_blocks %}
+	{{- configuration_block }}
+{% endfor %}
+
+events {
+	worker_connections {{ matrix_synapse_reverse_proxy_companion_worker_connections }};
+{% for configuration_block in matrix_synapse_reverse_proxy_companion_event_additional_configuration_blocks %}
+	{{- configuration_block }}
+{% endfor %}
+}
+
+
+http {
+	proxy_temp_path /tmp/proxy_temp;
+	client_body_temp_path /tmp/client_temp;
+	fastcgi_temp_path /tmp/fastcgi_temp;
+	uwsgi_temp_path /tmp/uwsgi_temp;
+	scgi_temp_path /tmp/scgi_temp;
+
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+					'$status $body_bytes_sent "$http_referer" '
+					'"$http_user_agent" "$http_x_forwarded_for"';
+
+	{% if matrix_synapse_reverse_proxy_companion_access_log_enabled %}
+	access_log /var/log/nginx/access.log main;
+	{% else %}
+	access_log off;
+	{% endif %}
+
+	proxy_connect_timeout       {{ matrix_synapse_reverse_proxy_companion_proxy_connect_timeout }};
+	proxy_send_timeout          {{ matrix_synapse_reverse_proxy_companion_proxy_send_timeout }};
+	proxy_read_timeout          {{ matrix_synapse_reverse_proxy_companion_proxy_read_timeout }};
+	send_timeout                {{ matrix_synapse_reverse_proxy_companion_send_timeout }};
+
+	sendfile on;
+	#tcp_nopush on;
+
+	keepalive_timeout 65;
+
+	server_tokens off;
+
+	#gzip on;
+	{# Map directive needed for proxied WebSocket upgrades #}
+	map $http_upgrade $connection_upgrade {
+		default upgrade;
+		''      close;
+	}
+
+	include /etc/nginx/conf.d/*.conf;
+}