function decodeAcl(AccessControlPolicy) {
    var result = {
        GrantFullControl: [],
        GrantWrite: [],
        GrantRead: [],
        GrantReadAcp: [],
        GrantWriteAcp: [],
        ACL: '',
    };
    var GrantMap = {
        'FULL_CONTROL': 'GrantFullControl',
        'WRITE': 'GrantWrite',
        'READ': 'GrantRead',
        'READ_ACP': 'GrantReadAcp',
        'WRITE_ACP': 'GrantWriteAcp',
    };
    var Grant = AccessControlPolicy.AccessControlList.Grant;
    if (Grant) {
        Grant = util.isArray(Grant) ? Grant : [Grant];
    }
    var PublicAcl = {READ: 0, WRITE: 0, FULL_CONTROL: 0};
    Grant.length && util.each(Grant, function (item) {
        if (item.Grantee.ID === 'qcs::cam::anyone:anyone' || item.Grantee.URI === 'http://cam.qcloud.com/groups/global/AllUsers') {
            PublicAcl[item.Permission] = 1;
        } else if (item.Grantee.ID !== AccessControlPolicy.Owner.ID) {
            result[GrantMap[item.Permission]].push('id="' + item.Grantee.ID + '"');
        }
    });
    if (PublicAcl.FULL_CONTROL || (PublicAcl.WRITE && PublicAcl.READ)) {
        result.ACL = 'public-read-write';
    } else if (PublicAcl.READ) {
        result.ACL = 'public-read';
    } else {
        result.ACL = 'private';
    }
    util.each(GrantMap, function (item) {
        result[item] = uniqGrant(result[item].join(','));
    });
    return result;
}