{
    "type": "wxCdnDown",
    "params": {
        "robotId": "当前机器人微信ID",
        "instanceId": "实例id 和 robotId 二者填一者就可以",
        "fileSize": 0,
        "aesKey": "string",
        "authKey": "string",
        "url": "string",
        "savePath": "string"
    }
}
{
    "type":11171,
    "data":{
        "url":"{{params.url}}",
        "auth_key":"{{params.authKey}}",
        "aes_key":"{{params.aesKey}}",
        "size":16504,
        "save_path":"{{params.savePath}}"
    }
}