Blockchain 仅按唯一键以稳定方式排列

我希望构建一个简单的智能合约，能够创建资产并向其添加具有不同角色的用户。每个用户在分配每个资产时只能有一个角色

实体代码：

contract AccessManagement {

struct Authorization {
    string role;
    bool active;
}

struct Asset {
    address owner;
    address[] authorizationList;
    mapping(address => Authorization) authorizationStructs;
    bool initialized;    
}

mapping(string => Asset) assetStructs;
string[] assetList;

function newAsset(string assetKey) public returns(bool success) {
    // Check for duplicates
    assetStructs[assetKey].owner = msg.sender;
    assetStructs[assetKey].initialized = true;
    assetList.push(assetKey);
    return true;
} 

function addAuthorization(string assetKey, address authorizationKey, string authorizationRole) public returns(bool success) {
    // ??? - Require Role "Admin"
    // ??? - Push only if "authorizationKey" is unique. Otherwise change the values.
    assetStructs[assetKey].authorizationList.push(authorizationKey);
    assetStructs[assetKey].authorizationStructs[authorizationKey].role = authorizationRole;
    assetStructs[assetKey].authorizationStructs[authorizationKey].active = true;
    return true;
}
function getAssetAuthorization(string assetKey, address authorizationKey) public constant returns(string authorizationRole) {
    return(assetStructs[assetKey].authorizationStructs[authorizationKey].role);
}
}

我的问题是：

• 如果“authorizationKey”是唯一的，我如何确保它被推送到authorizationList[]？如果不是唯一的，则只应更改值
• 如何检查“assetStructs[assetKey].authorizationStructs[msg.sender].role”是否为 等于管理员

---

我看不到您在任何地方使用授权列表。你可以移除它。要确保始终只有一个授权密钥，可以使用现有映射。现有条目将被覆盖。 当您想知道密钥是否存在时，请检查

活动

是否为

真

，因为对于所有不存在的密钥，默认情况下都是

假

。 您是否需要在某个点迭代所有地址
为了检查角色是否等于Admin，我将为角色创建一个函数，并与之进行比较。大概是这样的：

// Enum
enum Roles { User, Admin };

// Struct
struct Authorization {
    Roles role;
    bool active;
}

// Checking
if (assetStructs[assetKey].authorizationStructs[authorizationKey].role == Roles.Admin) {
    // something here
}