Advertise the onion site on clearnet via Onion-Location header.

nginx/conf.d/clearnet.conf.template

@@ -18,5 +18,7 @@ server {
     ssl_certificate /etc/nginx/certs/live/${CLEARNET_DOMAIN}/fullchain.pem;
     ssl_certificate_key /etc/nginx/certs/live/${CLEARNET_DOMAIN}/privkey.pem;
 
+    ${ONION_LOCATION_HEADER}
+
     include /etc/nginx/snippets/nullcart-locations-${SHOP_SURFACE}.conf;
 }

nginx/docker-entrypoint.sh

@@ -16,6 +16,21 @@ render_server() {
     surface="$3"
     SHOP_SURFACE="$surface"
     export SHOP_SURFACE CLEARNET_DOMAIN BACKEND_PORT
+
+    if [ "$surface" = "clearnet" ]; then
+        if [ -n "${ONION_HOSTNAME:-}" ]; then
+            export ONION_LOCATION_HEADER="add_header Onion-Location \"http://${ONION_HOSTNAME}\$request_uri\";"
+        else
+            export ONION_LOCATION_HEADER=""
+        fi
+
+        envsubst '${CLEARNET_DOMAIN} ${BACKEND_PORT} ${SHOP_SURFACE} ${ONION_LOCATION_HEADER}' \
+            < "$template_path" \
+            > "$output_path"
+
+        return
+    fi
+
     envsubst '${CLEARNET_DOMAIN} ${BACKEND_PORT} ${SHOP_SURFACE}' \
         < "$template_path" \
         > "$output_path"