# http://nginx.org/en/docs/http/websocket.html
map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

# http server
server {
    listen       80;
<% if (hasIPv6) { -%>
    listen       [::]:80;
<% } -%>

<% if (vhost) { -%>
    server_name  <%= vhost %>;
<% } else { -%>
    # IP based access from collectd or initial cloudron setup. TODO: match the IPv6 address
    server_name  "~^\d+\.\d+\.\d+\.\d+$";

    # collectd
    location /nginx_status {
        stub_status on;
        access_log off;
        allow 127.0.0.1;
        deny all;
    }
<% } -%>

    # acme challenges (for cert renewal where the vhost config exists)
    location /.well-known/acme-challenge/ {
        default_type text/plain;
        alias /home/yellowtent/platformdata/acme/;
    }

    location / {
        # redirect everything to HTTPS
        return 301 https://$host$request_uri;
    }
}

# https server
server {
<% if (vhost) { -%>
    server_name  <%= vhost %>;
    listen       443 http2;
<% if (hasIPv6) { -%>
    listen       [::]:443 http2;
<% } -%>
<% } else { -%>
    listen       443 http2 default_server;
<% if (hasIPv6) { -%>
    listen       [::]:443 http2 default_server;
<% } -%>
<% } -%>

    ssl                  on;
    # paths are relative to prefix and not to this file
    ssl_certificate      <%= certFilePath %>;
    ssl_certificate_key  <%= keyFilePath %>;
    ssl_session_timeout  5m;
    ssl_session_cache shared:SSL:50m;

    # https://bettercrypto.org/static/applied-crypto-hardening.pdf
    # https://mozilla.github.io/server-side-tls/ssl-config-generator/
    # https://cipherli.st/
    # https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
    ssl_prefer_server_ciphers on;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # don't use SSLv3 ref: POODLE

    # ciphers according to https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=nginx-1.10.3&openssl=1.0.2g&hsts=yes&profile=modern
    ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
    ssl_dhparam /home/yellowtent/boxdata/dhparams.pem;
    add_header Strict-Transport-Security "max-age=15768000";

    # https://developer.mozilla.org/en-US/docs/Web/HTTP/X-Frame-Options
    add_header X-Frame-Options "<%= xFrameOptions %>";
    proxy_hide_header X-Frame-Options;

    # https://github.com/twitter/secureheaders
    # https://www.owasp.org/index.php/OWASP_Secure_Headers_Project#tab=Compatibility_Matrix
    # https://wiki.mozilla.org/Security/Guidelines/Web_Security
    add_header X-XSS-Protection "1; mode=block";
    proxy_hide_header X-XSS-Protection;
    add_header X-Download-Options "noopen";
    proxy_hide_header X-Download-Options;
    add_header X-Content-Type-Options "nosniff";
    proxy_hide_header X-Content-Type-Options;
    add_header X-Permitted-Cross-Domain-Policies "none";
    proxy_hide_header X-Permitted-Cross-Domain-Policies;
    add_header Referrer-Policy "no-referrer-when-downgrade";
    proxy_hide_header Referrer-Policy;

    # gzip responses that are > 50k and not images
    gzip on;
    gzip_min_length 50k;
    gzip_types text/css text/javascript text/xml text/plain application/javascript application/x-javascript application/json;

    # enable for proxied requests as well
    gzip_proxied any;

<% if ( endpoint === 'admin' ) { -%>
    # CSP headers for the admin/dashboard resources
    add_header Content-Security-Policy "default-src 'none'; connect-src wss: https: 'self' *.cloudron.io; script-src https: 'self' 'unsafe-inline' 'unsafe-eval'; img-src * data:; style-src https: 'unsafe-inline'; object-src 'none'; font-src https: 'self'; frame-ancestors 'none'; base-uri 'none'; form-action 'self';";
<% } -%>

    proxy_http_version 1.1;
    proxy_intercept_errors on;
    proxy_read_timeout       3500;
    proxy_connect_timeout    3250;

    proxy_set_header   Host               $host;
    proxy_set_header   X-Forwarded-For    $remote_addr;
    proxy_set_header   X-Forwarded-Host   $host;
    proxy_set_header   X-Forwarded-Port   $server_port;
    proxy_set_header   X-Forwarded-Proto  https;
    proxy_set_header   X-Forwarded-Ssl    on;

    # upgrade is a hop-by-hop header (http://nginx.org/en/docs/http/websocket.html)
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;

    # only serve up the status page if we get proxy gateway errors
    root <%= sourceDir %>/dashboard/dist;
    error_page 502 503 504 /appstatus.html;
    location /appstatus.html {
        internal;
    }

    location / {
        # increase the proxy buffer sizes to not run into buffer issues (http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffers)
        proxy_buffer_size       128k;
        proxy_buffers           4 256k;
        proxy_busy_buffers_size 256k;

        # No buffering to temp files, it fails for large downloads
        proxy_max_temp_file_size 0;

        # Disable check to allow unlimited body sizes. this allows apps to accept whatever size they want
        client_max_body_size 0;

<% if (robotsTxtQuoted) { %>
        location = /robots.txt {
            return 200 <%- robotsTxtQuoted %>;
        }
<% } %>

<% if ( endpoint === 'admin' ) { %>
        location /api/ {
            proxy_pass   http://127.0.0.1:3000;
            client_max_body_size 1m;
        }

        location ~ ^/api/v1/(developer|session)/login$ {
            proxy_pass   http://127.0.0.1:3000;
            client_max_body_size 1m;
            limit_req zone=admin_login burst=5;
        }

        # the read timeout is between successive reads and not the whole connection
        location ~ ^/api/v1/apps/.*/exec$ {
            proxy_pass   http://127.0.0.1:3000;
            proxy_read_timeout 30m;
        }

        location ~ ^/api/v1/apps/.*/upload$ {
            proxy_pass   http://127.0.0.1:3000;
            client_max_body_size 0;
        }

        # graphite paths (uncomment block below and visit /graphite/index.html)
        # remember to comment out the CSP policy as well to access the graphite dashboard
        # location ~ ^/(graphite|content|metrics|dashboard|render|browser|composer)/ {
        #     proxy_pass   http://127.0.0.1:8417;
        #     client_max_body_size 1m;
        # }

        location / {
            root   <%= sourceDir %>/dashboard/dist;
            index  index.html index.htm;
        }
<% } else if ( endpoint === 'app' ) { %>
        proxy_pass http://127.0.0.1:<%= port %>;
<% } else if ( endpoint === 'redirect' ) { %>
        # redirect everything to the app. this is temporary because there is no way
        # to clear a permanent redirect on the browser
        return 302 https://<%= redirectTo %>$request_uri;
<% } %>
    }
}