demo.conf

server {
    listen   80;
    index index.php index.html index.htm;

    set $root_path '/var/www';
    root $root_path;


	location /lua {
		default_type 'text/plain';
        content_by_lua 'ngx.say("hello, ttlsa lua")';
    }

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

        # add support for img which has query params,
        # like:  xxx.jpg?a=b&c=d_750x750.jpg
        if ($args ~* "^([^_]+)_(\d+)+x(\d+)+\.(jpg|jpeg|gif|png)$") {
            set $w $2;
            set $h $3;
            set $img_ext $4;

            # rewrite ^\?(.*)$ _${w}x${h}.$img_ext? last;
            rewrite ([^.]*).(jpg|jpeg|png|gif)$  $1.$2_${w}x${h}.$img_ext? permanent;
        }
    }

    # set var for thumb pic
    set $upload_path /opt/uploads;
    set $img_original_root  $upload_path;# original root;
    set $img_thumbnail_root $upload_path/cache/thumb;
    set $img_file $img_thumbnail_root$uri;

    # like：/xx/xx/xx.jpg_100-.jpg or /xx/xx/xx.jpg_-100.jpg
    location ~* ^(.+\.(jpg|jpeg|gif|png))_((\d+\-)|(\-\d+))\.(jpg|jpeg|gif|png)$ {
            root $img_thumbnail_root;    # root path for croped img
            set $img_size $3;

            if (!-f $img_file) {    # if file not exists
                    add_header X-Powered-By 'Nginx+Lua+GraphicsMagick By Yanue';  #  header for test
                    add_header file-path $request_filename;    #  header for test
                    set $request_filepath $img_original_root$1;    # origin_img full path：/document_root/1.gif
                    set $img_size $3;    # img width or height size depends on uri
                    set $img_ext $2;    # file ext
                    content_by_lua_file /etc/nginx/lua/autoSize.lua;    # load lua
            }
    }

    # like: /xx/xx/xx.jpg_100x100.jpg
    location ~* ^(.+\.(jpg|jpeg|gif|png))_(\d+)+x(\d+)+\.(jpg|jpeg|gif|png)$ {
            root $img_thumbnail_root;    # root path for croped img

            if (!-f $img_file) {    # if file not exists
                    add_header X-Powered-By 'Nginx+Lua+GraphicsMagick By Yanue';  #  header for test
                    add_header file-path $request_filename;    #  header for test
                    set $request_filepath $img_original_root$1;    # origin_img file path
                    set $img_width $3;    # img width
                    set $img_height $4;    # height
                    set $img_ext $5;    # file ext
                    content_by_lua_file /etc/nginx/lua/cropSize.lua;    # load lua
            }
    }

    # if need (all go there)
    location ^~ /uploads {
            root $img_original_root;
    }


    location ~ /\.ht {
        deny all;
    }
}