nginx.conf

upstream upload {
    server 127.0.0.1:8001;
}

upload_progress proxied 1m;

server {
    listen 8080;
    server_name localhost;

    set $BASE_PATH /home/webmaster/app;

    set $files $BASE_PATH/files;
    set $cache $BASE_PATH/cache;
    set $image_handler $BASE_PATH/image_handler.lua;
    set $magick_path $BASE_PATH/magick.lua;

    client_max_body_size 512m;
    client_body_buffer_size 1024k;

    location ~ ^/(?<path>.*\.(?<ext>.*))$ {
        root $get_root;
        set $limit_rate 2m;
        mp4;

        set $size $arg_size;
        set $blur $arg_blur;
        set_md5 $digest $arg_size/$blur/$path;
        set $source_file $files/$path;
        set $cache_path $cache/$f/$s;
        set $cache_file $cache_path/$digest.$ext;
        try_files /$f/$s/$digest.$ext /$path @image_server;
    }

    location /upload/ {
        upload_pass @upload;
        upload_store $files;
        #upload_limit_rate 10m;

        upload_set_form_field name $upload_file_name;
        upload_set_form_field path $upload_tmp_path;
        upload_aggregate_form_field size $upload_file_size;
        upload_aggregate_form_field md5 $upload_file_md5;

        track_uploads proxied 30s;
    }

    location /progress/ {
        upload_progress_json_output;
        report_uploads proxied;
    }

    location @image_server {
        content_by_lua_file $image_handler;
    }

    location @upload {
        proxy_pass http://upload;
        proxy_set_header Host $host:$server_port;
    }

    error_page 500 = @bad_request;

    location @bad_request {
        return 400;
    }
}

map $digest $f {
    "~^(?<first>.{2})" $first;
}

map $digest $s {
    "~^.{2}(?<second>.{2})" $second;
}

map $arg_size $get_root {
    "~^(.*)x(.*)" $cache;
    "" $files;
}