limit_req_zone $binary_remote_addr zone=lemmy_ratelimit:10m rate=1r/s;

upstream backend {
    server "{{ env "STACK_NAME" }}_app:8536";
}

upstream frontend {
    server "{{ env "STACK_NAME" }}_ui:1234";
}

server {
    listen 80;
    listen [::]:80;
    server_name {{ env "DOMAIN" }};

    # Hide nginx version
    server_tokens off;

    # Enable compression for JS/CSS/HTML bundle, for improved client load times.
    # It might be nice to compress JSON, but leaving that out to protect against potential
    # compression+encryption information leak attacks like BREACH.
    gzip on;
    gzip_types text/css application/javascript image/svg+xml;
    gzip_vary on;

    # Upload limit for pictrs
    client_max_body_size 20M;

    # frontend
    location / {
      set $proxpass "http://frontend";
      if ($http_accept ~ "^application/.*$") {
        set $proxpass "http://backend";
      }
      if ($request_method = POST) {
        set $proxpass "http://backend";
      }
      proxy_pass $proxpass;

      rewrite ^(.+)/+$ $1 permanent;

      # Send actual client IP upstream
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header Host $host;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # backend
    location ~ ^/(api|pictrs|feeds|nodeinfo|.well-known) {
			proxy_pass "http://{{ env "STACK_NAME" }}_app:8536";
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";

      # Rate limit
      limit_req zone=lemmy_ratelimit burst=30 nodelay;

      # Add IP forwarding headers
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header Host $host;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }


    # Redirect pictshare images to pictrs
    location ~ /pictshare/(.*)$ {
      return 301 /pictrs/image/$1;
    }

}

# Anonymize IP addresses
# https://www.supertechcrew.com/anonymizing-logs-nginx-apache/
map $remote_addr $remote_addr_anon {
  ~(?P<ip>\d+\.\d+\.\d+)\.    $ip.0;
  ~(?P<ip>[^:]+:[^:]+):       $ip::;
  127.0.0.1                   $remote_addr;
  ::1                         $remote_addr;
  default                     0.0.0.0;
}
access_log /var/log/nginx/access.log combined;