## Set a variable to help us decide if we need to add the
## 'Docker-Distribution-Api-Version' header.
## The registry always sets this header.
## In the case of nginx performing auth, the header is unset
## since nginx is auth-ing before proxying.
map $upstream_http_docker_distribution_api_version $docker_distribution_api_version {
    '' 'registry/2.0';
}

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name registry.zinomedia.de;

    access_log off;
    error_log /var/log/nginx/error.log error;

    ssl_certificate /etc/letsencrypt/live/registry.zinomedia.de/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/registry.zinomedia.de/privkey.pem;

    # Recommendations from https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
    ssl_protocols TLSv1.1 TLSv1.2;
    ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
    ssl_prefer_server_ciphers on;

    # disable any limits to avoid HTTP 413 for large image uploads
    client_max_body_size 0;

    # required to avoid HTTP 411: see Issue #1486 (https://github.com/moby/moby/issues/1486)
    chunked_transfer_encoding on;

    # Password protect
    auth_basic "Protected Registry";
    auth_basic_user_file /usr/share/nginx/html/registry.zinomedia.de/.htpasswd;

    location /v2/ {
        if ($request_method = OPTIONS) {
            add_header 'Access-Control-Allow-Origin' 'https://registryui.zinomedia.de';
            add_header 'Access-Control-Allow-Credentials' 'true';
            add_header 'Access-Control-Allow-Headers' 'Authorization, Accept, Cache-Control';
            add_header 'Access-Control-Allow-Methods' 'HEAD, GET, OPTIONS, DELETE';
            add_header 'Content-Length' '0';
            add_header 'Content-Type' 'text/plain charset=UTF-8';
            return 204;
        }

        add_header Access-Control-Allow-Origin "https://registryui.zinomedia.de";
        add_header Access-Control-Allow-Credentials "true";
        add_header Access-Control-Allow-Headers "Authorization, Accept, Cache-Control";
        add_header Access-Control-Allow-Methods "HEAD, GET, OPTIONS, DELETE";

        # Do not allow connections from docker 1.5 and earlier
        if ($http_user_agent ~ "^(docker\/1\.(3|4|5(?!\.[0-9]-dev))|Go ).*$" ) {
            return 404;
        }

        ## If $docker_distribution_api_version is empty, the header is not added.
        ## See the map directive above where this variable is defined.
        add_header 'Docker-Distribution-Api-Version' $docker_distribution_api_version always;

        resolver 127.0.0.11;
        set $upstream "http://registry:5000";
        proxy_pass $upstream;

        proxy_set_header Host $http_host; # required for docker client's sake
        proxy_set_header X-Real-IP $remote_addr; # pass on real client's IP
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 900;
    }
}

server {
    listen 80;
    listen [::]:80;
    server_name registry.zinomedia.de;
    return 301 https://$host$request_uri;
}