update nginx configs for cinny, hydrogen, and synapse reverse proxy companion with ip anonymization

roles/custom/matrix-client-cinny/templates/nginx.conf.j2

@@ -31,9 +31,15 @@ http {
 	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"';
+	map $remote_addr $remote_addr_anon {
+		~(?P<ip>\d+\.\d+\.\d+)\.    $ip.0;
+		~(?P<ip>[^:]+:[^:]+):       $ip::;
+		default                     0.0.0.0;
+	}
+
+	log_format main '$remote_addr_anon - $remote_user [$time_local] "$request" '
+		'$status $body_bytes_sent "$http_referer" '
+		'"$http_user_agent" "$http_x_forwarded_for"';
 
 	access_log /var/log/nginx/access.log main;
 

roles/custom/matrix-client-hydrogen/templates/nginx.conf.j2

@@ -31,9 +31,15 @@ http {
 	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"';
+	map $remote_addr $remote_addr_anon {
+		~(?P<ip>\d+\.\d+\.\d+)\.    $ip.0;
+		~(?P<ip>[^:]+:[^:]+):       $ip::;
+		default                     0.0.0.0;
+	}
+
+	log_format main '$remote_addr_anon - $remote_user [$time_local] "$request" '
+		'$status $body_bytes_sent "$http_referer" '
+		'"$http_user_agent" "$http_x_forwarded_for"';
 
 	access_log /var/log/nginx/access.log main;
 

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

@@ -33,9 +33,15 @@ http {
 	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"';
+	map $remote_addr $remote_addr_anon {
+		~(?P<ip>\d+\.\d+\.\d+)\.    $ip.0;
+		~(?P<ip>[^:]+:[^:]+):       $ip::;
+		default                     0.0.0.0;
+	}
+
+	log_format main '$remote_addr_anon - $remote_user [$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;