user www-data www-data;

worker_processes 8;

pid /var/run/nginx.pid;

events {
    worker_connections 768;
    multi_accept on;
    use epoll;
}

http {
    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    types_hash_max_size 2048;
    server_tokens off;

    server_names_hash_max_size 2048;
    server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include mime.types;
    default_type application/octet-stream;
    
    # default charset
    charset utf-8;

    ##
    # Some of SSL settings are in snippets/ssl.conf
    # included in all ssl-enabled hosts
    ##

    # Mozilla SSL Intermediate profile
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
    ssl_prefer_server_ciphers on;
    
    # cache SSL sessions for 10m (this is about 40,000 sessions), timing them out
    # after 24 hours.
    # https://sethvargo.com/getting-an-a-plus-on-qualys-ssl-labs-tester/
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 24h;

    # set the buffer size to 1400 bytes (that way it fits into a single MTU).
    ssl_buffer_size 1400;

    # this is generated in docker/nginx/run.sh
    ssl_dhparam '/etc/ssl/nginx/dhparam.pem';

    ##
    # Default Logging Settings
    ##

    access_log /srv/logs/nginx/access.log combined;
    error_log /srv/logs/nginx/error.log;
    
    ######################################################################
    ## Various configuration sections:                                  ##
    ######################################################################
    
    ##
    # Gzip Settings
    ##

    gzip on;
    gzip_disable "msie6";

    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_buffers 16 8k;
    gzip_http_version 1.1;
    gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript image/svg+xml;

    
    ##
    # Size Limits & Buffer Overflows
    ##

    #client_header_buffer_size 1k;
    client_max_body_size 20m;
    client_body_buffer_size 1m;
    #large_client_header_buffers 2 1k;

    ##
    # Start: Timeouts
    ##
    client_body_timeout   10;
    client_header_timeout 10;
    keepalive_timeout     5 5;
    send_timeout  10;

    # Directive describes the zone, in which the session states are stored i.e. store in slimits.
    # 1m can handle 32000 sessions with 32 bytes/session, set to 5m x 32000 session
    # limit_conn_zone $binary_remote_addr zone=slimits:5m;

    # Control maximum number of simultaneous connections for one session i.e.
    # restricts the amount of connections from a single ip address
    # limit_conn slimits 5;


    # 
    # rate limiting
    # https://www.nginx.com/blog/rate-limiting-nginx/
    # https://nginx.org/en/docs/http/ngx_http_limit_req_module.html
    # 
    # just add "limit_req zone=ddosed burst=100;" in any location
    # that is supposed to be rate-limited
    limit_req_zone $binary_remote_addr zone=ddosed:20m rate=10r/s;

    ##
    #  Proxy cache settings
    ##

    # keys_zone=fasada:10m - how long the cache is considered fresh
    # max_size=3G          - we're fine with large cache size on disk
    # inactive=12h         - stale cached content is retained in cache for 12h at least
    #                        this is necessary if we want to be able to serve stale content
    #                        in case of errors longer than the time the cache is considered "fresh"
    #                        which we do -- this gives us the ability to survive a backend crash
    #                        with most users not noticing
    proxy_cache_path /srv/data/cache/nginx/proxy/ levels=1:2 keys_zone=fasada:10m max_size=3G inactive=12h;

    #
    # A cached response is first written to a temporary file, and then the file is renamed.
    # Starting from version 0.8.9, temporary files and the cache can be put on different file systems.
    # However, be aware that in this case a file is copied across two file systems instead of
    # the cheap renaming operation. It is thus recommended that for any given location both
    # cache and a directory holding temporary files are put on the same file system. The directory
    # for temporary files is set based on the use_temp_path parameter (1.7.10).
    #
    proxy_temp_path /srv/data/cache/nginx/tmp/ 1 2;

    # no fastcgi around
    #fastcgi_cache_path /srv/data/cache/nginx/fastcgi/ levels=1:2 keys_zone=fastcgicache:100m max_size=5G;

    proxy_cache_key $scheme:$request_method:$host/$uri$is_args$args;
    # no fastcgi around
    #fastcgi_cache_key "$proxy_host|$request_method|$scheme|$host|$request_uri|$is_args|$args|$cookie_user|$cookie_phpsessid";

    # by default, bypass the cache when:
    # - Pragma: no-cache is present
    # - any cookie is present
    proxy_cache_bypass $http_pragma $http_cookie;

    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 $scheme;

    proxy_intercept_errors on;
    proxy_buffering on;
    proxy_buffer_size 128k;
    proxy_buffers 256 16k;
    proxy_busy_buffers_size 256k;
    proxy_temp_file_write_size 256k;
    proxy_max_temp_file_size 0;

    # Defines a timeout for establishing a connection with a proxied server.
    # It should be noted that this timeout cannot usually exceed 75 seconds. 
    proxy_connect_timeout   2;

    # Sets a timeout for transmitting a request to the proxied server.
    # The timeout is set only between two successive write operations,
    # not for the transmission of the whole request.
    # If the proxied server does not receive anything within this time,
    # the connection is closed. 
    proxy_send_timeout      120;

    # Defines a timeout for reading a response from the proxied server.
    # The timeout is set only between two successive read operations,
    # not for the transmission of the whole response.
    # If the proxied server does not transmit anything within this time,
    # the connection is closed. 
    proxy_read_timeout      5;

    
    ##
    # Virtual Host Configs
    ##

    include sites/*.conf;
}