Adding static meta data on signatures

front/nginx.prod.conf

@@ -41,6 +41,25 @@ http {
             default_type text/javascript;
         }
 
+        location /contracts/signature/ {
+            set $is_robot 0;
+            if ($http_user_agent ~* "Discordbot|googlebot|bingbot|yandex|baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest\/0\.|pinterestbot|slackbot|vkShare|W3C_Validator|whatsapp") {
+                rewrite /contracts/signature/(.*) /api/v1/contract/print/opengraph/$1 last;
+                proxy_pass         http://docker-back;
+                set $is_robot 1;
+            }
+
+            if ($is_robot = 0) {
+                rewrite ^ /index.html?$args last;
+            }
+
+            proxy_redirect     off;
+            proxy_set_header   Host $host;
+            proxy_set_header   X-Real-IP $remote_addr;
+            proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header   X-Forwarded-Host $server_name;
+        }
+
         location /api/v1/ {
             proxy_pass         http://docker-back/;
             proxy_redirect     off;