accessid = 'LTAI5tR6RRZmNb92xeWEdnZA';
accesskey = 'vHG2vjEE9hCPtednFbd8xKt0owfp38';
host = 'https://yqlguestdata.oss-cn-hangzhou.aliyuncs.com';

g_dirname = ''
g_object_name = ''
g_object_name_type = ''
now = timestamp = Date.parse(new Date()) / 1000;
var policyText = {
    "expiration": "2030-01-01T12:00:00.000Z", //设置该Policy的失效时间，超过这个失效时间之后，就没有办法通过这个policy上传文件了
    "conditions": [
        ["content-length-range", 0, 1048576000] // 设置上传文件的大小限制 1gb
    ]
};

var policyBase64 = Base64.encode(JSON.stringify(policyText))
message = policyBase64
var bytes = Crypto.HMAC(Crypto.SHA1, message, accesskey, {asBytes: true});
var signature = Crypto.util.bytesToBase64(bytes);

function check_object_radio() {
    var tt = document.getElementsByName('myradio');
    for (var i = 0; i < tt.length; i++) {
        if (tt[i].checked) {
            g_object_name_type = tt[i].value;
            break;
        }
    }
}

function get_dirname(id) {
    dir = document.getElementById("dirname" + id).value;
    if (dir != '' && dir.indexOf('/') != dir.length - 1) {
        dir = dir + '/'
    }
    //alert(dir)
    g_dirname = dir
}

function random_string(len) {
    len = len || 32;
    var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';
    var maxPos = chars.length;
    var pwd = '';
    for (i = 0; i < len; i++) {
        pwd += chars.charAt(Math.floor(Math.random() * maxPos));
    }
    return pwd;
}

function get_suffix(filename) {
    pos = filename.lastIndexOf('.')
    suffix = ''
    if (pos != -1) {
        suffix = filename.substring(pos)
    }
    return suffix;
}

function calculate_object_name(filename) {
    if (g_object_name_type == 'local_name') {
        g_object_name += "${filename}"
    } else if (g_object_name_type == 'random_name') {
        suffix = get_suffix(filename)
        g_object_name = g_dirname + random_string(10) + suffix
    }
    return ''
}

function get_uploaded_object_name(filename) {
    if (g_object_name_type == 'local_name') {
        tmp_name = g_object_name
        tmp_name = tmp_name.replace("${filename}", filename);
        return tmp_name
    } else if (g_object_name_type == 'random_name') {
        return g_object_name
    }
}

function set_upload_param(up, filename, ret) {
    g_object_name = g_dirname;
    if (filename != '') {
        suffix = get_suffix(filename)
        calculate_object_name(filename)
    }
    new_multipart_params = {
        'key': g_object_name,
        'policy': policyBase64,
        'OSSAccessKeyId': accessid,
        'success_action_status': '200', //让服务端返回200,不然，默认会返回204
        'signature': signature,
    };

    up.setOption({
        'url': host,
        'multipart_params': new_multipart_params
    });

    up.start();
}