# Configuration File - Nginx Server Configs
# https://nginx.org/en/docs/

# Run as a unique, less privileged user for security reasons.
# Default: nobody nobody
# https://nginx.org/en/docs/ngx_core_module.html#user
# https://en.wikipedia.org/wiki/Principle_of_least_privilege
user www-data;

# Sets the worker threads to the number of CPU cores available in the system for best performance.
# Should be > the number of CPU cores.
# Maximum number of connections = worker_processes * worker_connections
# Default: 1
# https://nginx.org/en/docs/ngx_core_module.html#worker_processes
worker_processes auto;

# Maximum number of open files per worker process.
# Should be > worker_connections.
# Default: no limit
# https://nginx.org/en/docs/ngx_core_module.html#worker_rlimit_nofile
worker_rlimit_nofile 8192;

# Provides the configuration file context in which the directives
# that affect connection processing are specified.
# https://nginx.org/en/docs/ngx_core_module.html#events
events {

  # If you need more connections than this, you start optimizing your OS.
  # That's probably the point at which you hire people who are smarter than you as this is *a lot* of requests.
  # Should be < worker_rlimit_nofile.
  # Default: 512
  # https://nginx.org/en/docs/ngx_core_module.html#worker_connections
  worker_connections 8000;

}

# Log errors and warnings to this file
# This is only used when you don't override it on a server{} level
# Default: logs/error.log error
# https://nginx.org/en/docs/ngx_core_module.html#error_log
error_log /var/log/nginx/error.log warn;

# The file storing the process ID of the main process
# Default: logs/nginx.pid
# https://nginx.org/en/docs/ngx_core_module.html#pid
pid /var/run/nginx.pid;

http {

  # Hide nginx version information.
  include h5bp/security/server_software_information.conf;

  # Specify MIME types for files.
  include h5bp/media_types/media_types.conf;

  # Set character encodings.
  include h5bp/media_types/character_encodings.conf;

  # Include $http_x_forwarded_for within default format used in log files
  # https://nginx.org/en/docs/http/ngx_http_log_module.html#log_format
  log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

  # Log access to this file
  # This is only used when you don't override it on a server{} level
  # Default: logs/access.log combined
  # https://nginx.org/en/docs/http/ngx_http_log_module.html#access_log
  access_log /var/log/nginx/access.log main;

  # How long to allow each connection to stay idle.
  # Longer values are better for each individual client, particularly for SSL,
  # but means that worker connections are tied up longer.
  # Default: 75s
  # https://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout
  keepalive_timeout 20s;

  # Speed up file transfers by using sendfile() to copy directly
  # between descriptors rather than using read()/write().
  # For performance reasons, on FreeBSD systems w/ ZFS
  # this option should be disabled as ZFS's ARC caches
  # frequently used files in RAM by default.
  # Default: off
  # https://nginx.org/en/docs/http/ngx_http_core_module.html#sendfile
  sendfile on;

  # Don't send out partial frames; this increases throughput
  # since TCP frames are filled up before being sent out.
  # Default: off
  # https://nginx.org/en/docs/http/ngx_http_core_module.html#tcp_nopush
  tcp_nopush on;

  # Enable gzip compression.
  include h5bp/web_performance/compression.conf;

  # Specify file cache expiration.
  include h5bp/web_performance/cache_expiration.conf;

  # Add X-XSS-Protection for HTML documents.
  # h5bp/security/x-xss-protection.conf
  map $sent_http_content_type $x_xss_protection {
    #           (1)    (2)
    ~*text/html "1; mode=block";
  }

  # Add X-Frame-Options for HTML documents.
  # h5bp/security/x-frame-options.conf
  map $sent_http_content_type $x_frame_options {
    ~*text/html DENY;
  }

  # Add Content-Security-Policy for HTML documents.
  # h5bp/security/content-security-policy.conf
  map $sent_http_content_type $content_security_policy {
    ~*text/html "default-src 'self'; base-uri 'none'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests";
  }

  # Add Referrer-Policy for HTML documents.
  # h5bp/security/referrer-policy.conf.conf
  map $sent_http_content_type $referrer_policy {
    ~*text/html "no-referrer-when-downgrade";
  }

  # Add X-UA-Compatible for HTML documents.
  # h5bp/internet_explorer/x-ua-compatible.conf
  map $sent_http_content_type $x_ua_compatible {
    ~*text/html "IE=edge";
  }

  # Add Access-Control-Allow-Origin.
  # h5bp/cross-origin/requests.conf
  map $sent_http_content_type $cors {
    # Images
    ~*image/ "*";

    # Web fonts
    ~*font/                         "*";
    ~*application/vnd.ms-fontobject "*";
    ~*application/x-font-ttf        "*";
    ~*application/font-woff         "*";
    ~*application/x-font-woff       "*";
    ~*application/font-woff2        "*";
  }

  # Include files in the conf.d folder.
  # server{} configuration files should be placed in the conf.d folder.
  # The configurations should be disabled by prefixing files with a dot.
  include conf.d/*.conf;

}