Add config for leaderboard (#45)

Redirect /leaderboard/* to leaderboard service running on port 8282
Add config to solve CORS issues
See also: https://github.com/uspgamedev/leaderboard

Author: LeaoLuciano

default.conf

@@ -86,6 +86,44 @@ server {
         include /etc/nginx/shared/proxy.conf;
     }
 
+    location /leaderboard {
+
+        # Solve CORS issues (sources: https://enable-cors.org/server_nginx.html https://michielkalkman.com/snippets/nginx-cors-open-configuration/)
+        if ($request_method = 'OPTIONS') {
+            add_header 'Access-Control-Allow-Origin' '*';
+            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
+            #
+            # Custom headers and headers various browsers *should* be OK with but aren't
+            #
+            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
+            #
+            # Tell client that this pre-flight info is valid for 20 days
+            #
+            add_header 'Access-Control-Max-Age' 1728000;
+            add_header 'Content-Type' 'text/plain; charset=utf-8';
+            add_header 'Content-Length' 0;
+            return 204;
+        }
+        if ($request_method = 'POST') {
+           add_header 'Access-Control-Allow-Origin' '*' always;
+           add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
+           add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
+           add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
+        }
+        if ($request_method = 'GET') {
+           add_header 'Access-Control-Allow-Origin' '*' always;
+            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
+            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
+            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
+        }
+
+        proxy_pass http://172.17.0.1:8282;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        include /etc/nginx/shared/proxy.conf;
+
+    }
 
     location /metrics {
         auth_basic           "Metrics";