FastDFS 之普通图片裁剪lua脚本

1.nginx配置

# attached img
server {
        listen 8802;
        server_name 10.1.8.54;

        location / {
                root /data/image/attached/b2b;
        }

        # 图片裁剪
        location ~* ^(.+\.(jpg|jpeg|gif|png))_(\d+)x(\d+)\.(jpg|jpeg|gif|png)$ {
                root /data/image/attached/b2b;

                if (!-f $request_filename) {
                add_header X-Powered-By 'Lua GraphicsMagick';
                add_header file-path $request_filename;
                #lua_code_cache off;
                set $request_filepath /data/image/attached/b2b$1;
                set $width $3;
                set $height $4;
                set $ext $5;
                content_by_lua_file /usr/local/nginx/conf/lua/ImageResizer.lua;
               }
        }

        # log file
        access_log  logs/attached_access.log access;
}

2.图片裁剪lua脚本

-- 生成指定尺寸
local area=ngx.var.width .. "x" .. ngx.var.height;
-- local image_sizes = {"100x100", "150x150", "200x200", "300x300", "400x400","600x600","800x800"};
local image_sizes = {"50x50","100x100", "150x150", "200x200", "300x300", "400x400","600x600","800x800"};
function table.contains(table, element)
    for _, value in pairs(table) do
        if value == element then
            return true
        end
    end
    return false
end

-- 生成缩略图
if table.contains(image_sizes, area) then
        local command = "/usr/local/GraphicsMagick/bin/gm convert -quality 90  -auto-orient -strip " .. ngx.var.request_filepath .. " -resize " .. area .. " +profile \"*\" " .. ngx.var.request_filepath .. "_" .. area .. "." .. ngx.var.ext;
        os.execute(command);
        ngx.exec(ngx.var.request_uri);
else
        ngx.exit(404)
end;