################################################################################
# Ultra Image Server
# A production grade image processing server setup powered by imgproxy and nginx
#
# Author: Mai Nhut Tan <shin@shin.company>
# Copyright: 2021-2024 SHIN Company https://code.shin.company/
# URL: https://shinsenter.github.io/docker-imgproxy/
################################################################################

# Generated by nginxconfig.io
# https://www.digitalocean.com/community/tools/nginx#?domains.0.server.documentRoot=%2Fhome&domains.0.server.wwwSubdomain=true&domains.0.https.forceHttps=false&domains.0.https.hstsPreload=true&domains.0.https.certType=custom&domains.0.https.sslCertificate=%2Fetc%2Fnginx%2Fcerts%2Fserver.crt&domains.0.https.sslCertificateKey=%2Fetc%2Fnginx%2Fcerts%2Fserver.key&domains.0.php.php=false&domains.0.reverseProxy.reverseProxy=true&domains.0.routing.index=index.html&domains.0.routing.fallbackHtml=true&domains.0.logging.accessLog=true&domains.0.logging.errorLog=true&domains.0.restrict.getMethod=true&domains.0.restrict.headMethod=true&global.https.portReuse=true&global.https.ocspCloudflareType=both&global.https.ocspGoogleType=both&global.https.ocspOpenDns=false&global.https.ocspOpenDnsType=both&global.https.ocspQuad9Type=both&global.https.ocspVerisignType=both&global.https.letsEncryptCertRoot=%2Fetc%2Fnginx%2Fcerts%2Fletsencrypt%2Flive%2F&global.security.limitReq=true&global.reverseProxy.proxyConnectTimeout=10&global.reverseProxy.proxySendTimeout=30&global.reverseProxy.proxyReadTimeout=30&global.performance.assetsExpiration=max&global.performance.mediaExpiration=30d&global.performance.svgExpiration=max&global.performance.fontsExpiration=max&global.logging.logNotFound=true&global.logging.cloudflare=true&global.logging.trueClientIp=true&global.logging.cfIpCountry=true&global.logging.cdnLoop=true&global.nginx.user=nginx&global.nginx.pid=%2Fvar%2Frun%2Fnginx.pid&global.nginx.clientMaxBodySize=1&global.nginx.typesHashMaxSize=4096&global.nginx.typesHashBucketSize=1024&global.docker.dockerfile=true&global.docker.dockerCompose=true&global.tools.modularizedStructure=false&global.tools.symlinkVhost=false

user                 nginx;
pid                  /var/run/nginx.pid;
worker_processes     auto;
worker_rlimit_nofile 65535;

# Load modules
include              /etc/nginx/modules-enabled/*.conf;

events {
    multi_accept       on;
    worker_connections 65535;
}

http {
    charset                utf-8;
    sendfile               on;
    tcp_nopush             on;
    tcp_nodelay            on;
    server_tokens          off;
    types_hash_max_size    4096;
    types_hash_bucket_size 1024;
    client_max_body_size   1M;
    recursive_error_pages  on;

    # MIME
    include                mime.types;
    include                /etc/nginx/nginx.d/*.conf;
    default_type           application/octet-stream;

    # Log Format
    log_format             cloudflare   '$remote_addr - $remote_user [$time_local] "$request" '
                                        '$status $body_bytes_sent "$http_referer" "$http_user_agent" '
                                        '"$upstream_cache_status" "$imgproxy_rewrite" '
                                        '$http_cf_ray $http_cf_connecting_ip $http_true_client_ip '
                                        '$http_cf_ipcountry $http_cdn_loop';

    # Logging
    access_log             /var/log/nginx/access.log cloudflare;
    error_log              /var/log/nginx/error.log  error;

    # Limits
    limit_req_log_level    warn;
    limit_req_zone         $binary_remote_addr zone=login:10m rate=10r/m;

    # SSL Session
    ssl_session_timeout    1d;
    ssl_session_cache      shared:SSL:32m;
    ssl_session_tickets    off;

    # Diffie-Hellman parameter for DHE ciphersuites
    ssl_dhparam            /etc/nginx/dhparam.pem;

    # Mozilla Intermediate configuration
    ssl_protocols          TLSv1.2 TLSv1.3;
    ssl_ciphers            ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;

    # OCSP Stapling
    ssl_stapling           off;
    ssl_stapling_verify    off;
    resolver_timeout       10s;
    resolver               1.1.1.1 1.0.0.1 [2606:4700:4700::1111] [2606:4700:4700::1001] 8.8.8.8 8.8.4.4 [2001:4860:4860::8888] [2001:4860:4860::8844] valid=60s;

    # Connection header for WebSocket reverse proxy
    map $http_upgrade $connection_upgrade {
        default upgrade;
        ""      close;
    }

    map $remote_addr $proxy_forwarded_elem {
        # IPv4 addresses can be sent as-is
        ~^[0-9.]+$        "for=$remote_addr";

        # IPv6 addresses need to be bracketed and quoted
        ~^[0-9A-Fa-f:.]+$ "for=\"[$remote_addr]\"";

        # Unix domain socket names cannot be represented in RFC 7239 syntax
        default           "for=unknown";
    }

    map $http_forwarded $proxy_add_forwarded {
        # If the incoming Forwarded header is syntactically valid, append to it
        "~^(,[ \\t]*)*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*([ \\t]*,([ \\t]*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*)?)*$" "$http_forwarded, $proxy_forwarded_elem";

        # Otherwise, replace it
        default "$proxy_forwarded_elem";
    }

    # main server
    server {
        set $html_root /home;

        server_name                          _;
        root                                 $html_root;
        index                                index.html;

        # HTTP
        listen                               80 reuseport default_server;
        listen                               [::]:80 reuseport default_server;

        # SSL
        # listen                               443 ssl http2 reuseport;
        # listen                               [::]:443 ssl http2 reuseport;
        # ssl_certificate                      /etc/nginx/certs/server.crt;
        # ssl_certificate_key                  /etc/nginx/certs/server.key;

        # Proxy options
        proxy_http_version                      1.1;
        proxy_intercept_errors                  on;
        proxy_no_cache                          $arg_nocache;
        proxy_ssl_verify                        off;
        proxy_cache_background_update           off;
        proxy_cache_bypass                      $http_upgrade $arg_bypass $arg_debug $arg_nocache;
        proxy_cache_lock                        on;
        proxy_cache_lock_age                    5s;
        proxy_cache_lock_timeout                5s;
        proxy_cache_methods                     GET HEAD;
        proxy_cache_min_uses                    1;
        proxy_cache_revalidate                  on;
        proxy_cache_valid                       200 206 6h;
        proxy_cache_valid                       any 1m;
        proxy_cache_use_stale                   error timeout invalid_header updating
                                                http_429 http_500 http_502 http_503 http_504;

        # Proxy headers
        proxy_set_header Upgrade                $http_upgrade;
        proxy_set_header Connection             $connection_upgrade;
        proxy_set_header Host                   $host;
        proxy_set_header X-Real-IP              $remote_addr;
        proxy_set_header Forwarded              $proxy_add_forwarded;
        proxy_set_header X-Forwarded-For        $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto      $scheme;
        proxy_set_header X-Forwarded-Host       $host;
        proxy_set_header X-Forwarded-Port       $server_port;

        # Proxy timeouts
        proxy_connect_timeout                   10s;
        proxy_send_timeout                      30s;
        proxy_read_timeout                      30s;

        # security headers
        add_header X-XSS-Protection             "1; mode=block" always;
        add_header X-Content-Type-Options       "nosniff" always;
        add_header Referrer-Policy              "no-referrer-when-downgrade" always;
        add_header Content-Security-Policy      "default-src 'self' http: https: data: blob: 'unsafe-inline'; frame-ancestors 'self';" always;
        add_header Permissions-Policy           "interest-cohort=()" always;
        add_header Strict-Transport-Security    "max-age=31536000; includeSubDomains; preload" always;

        # gzip
        gzip            on;
        gzip_vary       on;
        gzip_proxied    any;
        gzip_comp_level 6;
        gzip_types      text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

        # . files
        location ~ /\.(?!well-known) {
            deny all;
        }

        # restrict methods
        if ($request_method !~ ^(GET|HEAD)$) {
            return '405';
        }

        # favicon.ico
        location = /favicon.ico {
            log_not_found off;
            access_log    off;
        }

        # robots.txt
        location = /robots.txt {
            log_not_found off;
            access_log    off;
        }

        # proxy handlers
        error_page 418 = @imgproxy;
        error_page 421 = @remote;

        if ($imgproxy_rewrite)           { return 418; }
        if ($origin_server ~ ^https?://) { return 421; }

        # error pages
        error_page 401 403 404 405 422 429 500 501 502 503 504 =404 @fallback;

        # for imgproxy server
        location @imgproxy {
            # fallback to error image and error HTTP status
            error_page 401 403 404 405 422 429  =404 @fallback;
            error_page 500 501 502 503 504      =503 @fallback;
            add_header X-Cache $upstream_cache_status;
            add_header X-Debug $debug_imgproxy_rewrite always;

            proxy_cache     $imgproxy_cache;
            proxy_cache_key $imgproxy_rewrite;
            proxy_pass      http://upstream_imgproxy${imgproxy_rewrite};
        }

        # for remote servers
        location @remote {
            # fallback to error image and error HTTP status
            error_page 401 403 404 405 422 429  =404 @fallback;
            error_page 500 501 502 503 504      =503 @fallback;
            add_header X-Origin ${origin_server}${origin_uri} always;

            etag off;
            proxy_pass ${origin_server}${origin_uri};
        }

        # for fallback
        location @fallback {
            internal;
            etag off;

            try_files $fallback_uri $fallback_uri/;
            add_header X-Fallback $fallback_uri always;
        }

        # for localhost
        location / {
            try_files $origin_uri $uri $uri/ =404;
        }
    }
}