nginx image_filter resize config

nignx.conf

server {
    listen       80;
    server_name  www.test.com;
    return         301 https://$server_name$request_uri;
}

server {
    listen       443 ssl;
    server_name  www.test.com;
    charset utf-8;
    client_max_body_size 100M;

    #access_log  logs/host.access.log  main;

    root   /var/www/test/current/web/;
    index  index.html index.htm index.php;

    ssl_certificate /etc/letsencrypt/live/api.test.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.test.com/privkey.pem;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.(js|css|png|jpg|gif|swf|ico|pdf|mov|fla|zip|rar)$ {
        try_files $uri =404;
    }

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    location ~ \.php$ {
         root   /var/www/test/current/web;
        #fastcgi_pass   127.0.0.1:9000;
        fastcgi_pass    unix:/run/php/php7.0-fpm.sock;
        fastcgi_index  index.php;
        include        fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
    }

    location ~ /\.(ht|svn|git) {
        deny all;
    }

    location /.well-known/acme-challenge/ {
        alias /var/www/acme-challenge/.well-known/acme-challenge/;
    }

    # 缩略图
    location ~* /uploads/(.+)\.(jpg|png|jpeg|gif)!(\w)_(\d+)\*(\d+)$ {
        set $filename /uploads/$1.$2;

        if (-f $filename) {
          break;
        }

        if (!-f $document_root/$filename) {
            return 404;
        }

        # 根据 URL 地址 ! 后面的图片版本来准备好需要的参数（宽度、高度、裁剪或缩放）
        set $img_version $3;
        set $img_type resize;
        set $img_w    $4;
        set $img_h    $5;
        if ($img_version = 'c') {
          set $img_type crop;
        }

        rewrite ^ /_$img_type;
    }

    # 缩放图片的处理
    location /_resize {
        alias /var/www/test/current/web$filename;

        image_filter resize $img_w $img_h;
        image_filter_jpeg_quality 95;
        image_filter_buffer         20M;
        image_filter_interlace      on;
    }

    # 裁剪图片的处理
    location /_crop {
        alias /var/www/test/current/web$filename;

        image_filter crop $img_w $img_h;
        image_filter_jpeg_quality 95;
        image_filter_buffer         20M;
        image_filter_interlace      on;
    }
}