discourse_ynh/conf/nginx.conf

  # maximum file upload size (keep up to date when changing the corresponding site setting)
  client_max_body_size 10m;

  # path to discourse's public directory
  set $public __FINALPATH__/public/;

  # without weak etags we get zero benefit from etags on dynamically compressed content
  # further more etags are based on the file in nginx not sha of data
  # use dates, it solves the problem fine even cross server
  etag off;

  # prevent direct download of backups
  location ^~ __PATH__/backups/ {
    internal;
  }

  # bypass rails stack with a cheap 204 for favicon.ico requests
  location __PATH__/favicon.ico {
    return 204;
    access_log off;
    log_not_found off;
  }

  location __PATH__ {
    alias $public;
    add_header ETag "";

    if ($scheme = http) {
            rewrite ^ https://$server_name$request_uri? permanent;
    }

    # auth_basic on;
    # auth_basic_user_file /etc/nginx/htpasswd;

    # Include SSOWAT user panel.
    include conf.d/yunohost_panel.conf.inc;


    location ~* (assets|plugins|uploads)/.*\.(eot|ttf|woff|woff2|ico)$ {
      expires 1y;
      add_header Cache-Control public,immutable;
      add_header Access-Control-Allow-Origin *;
     }

    location = __PATH__/srv/status {
      access_log off;
      log_not_found off;
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Request-Start "t=${msec}";
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto https;
      proxy_pass http://unix:__FINALPATH__/tmp/sockets/puma.sock;
      break;
    }

    # some minimal caching here so we don't keep asking
    # longer term we should increas probably to 1y
    location ~ ^/javascripts/ {
      expires 1d;
      add_header Cache-Control public,immutable;
    }

    location ~ ^/assets/(?<asset_path>.+)$ {
      expires 1y;
      # asset pipeline enables this
      # brotli_static on;
      gzip_static on;
      add_header Cache-Control public,immutable;
      # HOOK in asset location (used for extensibility)
      # TODO I don't think this break is needed, it just breaks out of rewrite
      break;
    }

    location ~ ^/plugins/ {
      expires 1y;
      add_header Cache-Control public,immutable;
    }

    # cache emojis
    location ~ /images/emoji/ {
      expires 1y;
      add_header Cache-Control public,immutable;
    }

    location ~ ^/uploads/ {

      # NOTE: it is really annoying that we can't just define headers
      # at the top level and inherit.
      #
      # proxy_set_header DOES NOT inherit, by design, we must repeat it,
      # otherwise headers are not set correctly
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Request-Start "t=${msec}";
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto https;
      proxy_set_header X-Sendfile-Type X-Accel-Redirect;
      proxy_set_header X-Accel-Mapping $public/=/downloads/;
      expires 1y;
      add_header Cache-Control public,immutable;

      ## optional upload anti-hotlinking rules
      #valid_referers none blocked mysite.com *.mysite.com;
      #if ($invalid_referer) { return 403; }

      # custom CSS
      location ~ /stylesheet-cache/ {
          try_files $uri =404;
      }
      # this allows us to bypass rails
      location ~* \.(gif|png|jpg|jpeg|bmp|tif|tiff|svg|ico|webp)$ {
          try_files $uri =404;
      }
      # thumbnails & optimized images
      location ~ /_?optimized/ {
          try_files $uri =404;
      }

      proxy_pass http://unix:__FINALPATH__/tmp/sockets/puma.sock;
      break;
    }

    location ~ ^/admin/backups/ {
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Request-Start "t=${msec}";
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto https;
      proxy_set_header X-Sendfile-Type X-Accel-Redirect;
      proxy_set_header X-Accel-Mapping $public/=/downloads/;
      proxy_pass http://unix:__FINALPATH__/tmp/sockets/puma.sock;
      break;
    }

    # This big block is needed so we can selectively enable
    # acceleration for backups and avatars
    # see note about repetition above
    location ~ ^/(letter_avatar/|user_avatar|highlight-js|stylesheets|favicon/proxied|service-worker) {
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Request-Start "t=${msec}";
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto https;

      # if Set-Cookie is in the response nothing gets cached
      # this is double bad cause we are not passing last modified in
      proxy_ignore_headers "Set-Cookie";
      proxy_hide_header "Set-Cookie";

      # note x-accel-redirect can not be used with proxy_cache
#      proxy_cache one;
      proxy_cache_valid 200 301 302 7d;
      proxy_cache_valid any 1m;
      proxy_pass http://unix:__FINALPATH__/tmp/sockets/puma.sock;
      break;
    }

#    location /letter_avatar_proxy/ {
#      # Don't send any client headers to the avatars service
#      proxy_method GET;
#      proxy_pass_request_headers off;
#      proxy_pass_request_body off;
#
#      # Don't let cookies interrupt caching, and don't pass them to the
#      # client
#      proxy_ignore_headers "Set-Cookie";
#      proxy_hide_header "Set-Cookie";
#
#      proxy_cache one;
#      proxy_cache_key $uri;
#      proxy_cache_valid 200 7d;
#      proxy_cache_valid 404 1m;
#      proxy_set_header Connection "";
#
#      proxy_pass https://avatars.discourse.org/;
#      break;
#    }

    # we need buffering off for message bus
    location __PATH__/message-bus/ {
      proxy_set_header X-Request-Start "t=${msec}";
      proxy_set_header Host $http_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-Proto https;
      proxy_http_version 1.1;
      proxy_buffering off;
      proxy_pass http://unix:__FINALPATH__/tmp/sockets/puma.sock;
      break;
    }

    # this means every file in public is tried first
    try_files $uri @__NAME__;
  }

  location __PATH__/downloads/ {
    internal;
    alias $public/;
  }

  location @__NAME__ {
    add_header Referrer-Policy 'no-referrer-when-downgrade';
    proxy_set_header Host $http_host;
    proxy_set_header X-Request-Start "t=${msec}";
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto https;
    proxy_pass http://unix:__FINALPATH__/tmp/sockets/puma.sock;
}