.net core 阿里云接口之获取临时访问凭证

假设您是一个移动App开发者，希望使用阿里云OSS服务来保存App的终端用户数据，并且要保证每个App用户之间的数据隔离。此时，您可以使用STS授权用户直接访问OSS。

使用STS授权用户直接访问OSS的流程如下：

使用STS临时访问凭证访问OSS

切记别忘了设置权限！在添加权限页面，选择AliyunSTSAssumeRoleAccess系统策略

{
    "Aliyun": {
        "AccessKey": {
            "Id": "xxxxxxxxxx",
            "Secret": "xxxxxxxxxxxxxxxxxxxx"
        },
        "Endpoint": "xxxxxxxxxxxxxxxxxxxx",
        "BucketName": "xxxxxx",
        "UploadRoleArn": "xxxxxxxxxxxxxxxxxxxx"
    }
}

.net core 读取配置文件的几种方式_SunshineGGB的博客-CSDN博客

/// 

/// 获取临时访问凭证
/// 
/// 
[HttpPost, HttpGet, HttpOptions, CorsOptions]
public IActionResult GetTemporaryAccessCredentials()
{
    string accessKey = _configuration["Aliyun:AccessKey:Id"];
    string secretKey = _configuration["Aliyun:AccessKey:Secret"];
    string bucket = _configuration["Aliyun:BucketName"];
    string endpoint = _configuration["Aliyun:Endpoint"];
    string roleArn = _configuration["Aliyun:UploadRoleArn"];
    // 构建一个阿里云客户端，用于发起请求。
    // 构建阿里云客户端时需要设置AccessKey ID和AccessKey Secret。
    IClientProfile profile = DefaultProfile.GetProfile("cn-hangzhou", accessKey, secretKey);
    DefaultAcsClient client = new DefaultAcsClient(profile);
    // 构建请求，设置参数。关于参数含义和设置方法，请参见《API参考》。
    var request = new AssumeRoleRequest();
    request.RoleArn = roleArn;
    request.RoleSessionName = "test_role"; // 自定义角色会话名称，用来区分不同的令牌，例如可填写为SessionTest
    if(!string.IsNullOrWhiteSpace(accessKey) && !string.IsNullOrWhiteSpace(secretKey) && !string.IsNullOrWhiteSpace(roleArn) && !string.IsNullOrWhiteSpace(endpoint) && !string.IsNullOrWhiteSpace(bucket))
    {
        // 发起请求，并得到响应。
        try
        {
            var response = client.GetAcsResponse(request);
            // 辅助类
            STS_Signature STSMod = new STS_Signature();
            STSMod.AccessKeyId = response.Credentials.AccessKeyId;
            STSMod.AccessKeySecret = response.Credentials.AccessKeySecret;
            STSMod.SecurityToken = response.Credentials.SecurityToken;
            // Token过期时间；服务器返回UTC时间，这里转换成北京时间显示；
            STSMod.Expiration = DateTime.Parse(response.Credentials.Expiration).ToLocalTime();
            STSMod.Endpoint = endpoint;
            STSMod.BucketName = bucket;
            STSMod.Region = "oss-cn-shanghai";
            return SuccessResult(STSMod);
        }
        catch(ServerException e)
        {
            LogHelper.WriteErrorLog("临时授权失败,错误原因:" + e.Message);
            return ErrorResult("临时授权失败,错误原因:" + e.Message, 111150);
        }
        catch(Aliyun.Acs.Core.Exceptions.ClientException e)
        {
            LogHelper.WriteErrorLog("临时授权失败,错误原因:" + e.Message);
            return ErrorResult("临时授权失败,错误原因:" + e.Message, 111151);
        }
        catch(Exception ex)
        {
            LogHelper.WriteErrorLog("临时授权失败,错误原因:" + ex.Message);
            return ErrorResult("临时授权失败,错误原因:" + ex.Message, 111152);
        }
    }
    else return ErrorResult("阿里云配置文件读取失败，请联系网站管理员！", 111111);
}

public class STS_Signature
{
    private string _AccessKeyId;
    public string AccessKeyId
    {
        get
        {
            return _AccessKeyId;
        }
        set
        {
            _AccessKeyId = value;
        }
    }
    private string _AccessKeySecret;
    public string AccessKeySecret
    {
        get
        {
            return _AccessKeySecret;
        }
        set
        {
            _AccessKeySecret = value;
        }
    }
    private string _SecurityToken;
    public string SecurityToken
    {
        get
        {
            return _SecurityToken;
        }
        set
        {
            _SecurityToken = value;
        }
    }
    private string _Endpoint;
    public string Endpoint
    {
        get
        {
            return _Endpoint;
        }
        set
        {
            _Endpoint = value;
        }
    }
    private string _BucketName;
    public string BucketName
    {
        get
        {
            return _BucketName;
        }
        set
        {
            _BucketName = value;
        }
    }
    private DateTime _Expiration;
    public DateTime Expiration
    {
        get
        {
            return _Expiration;
        }
        set
        {
            _Expiration = value;
        }
    }
    private string _Region;
    public string Region
    {
        get
        {
            return _Region;
        }
        set
        {
            _Region = value;
        }
    }
}

首先要在NuGet中安装Log4Net

public static class LogHelper
{
    private static log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    public static void WriteInfoLog(string message)
    {
        try
        {
            log.Info(message);
        }
        catch(Exception ex)
        {}
    }
    public static void WriteErrorLog(string message)
    {
        try
        {
            log.Error(message);
        }
        catch(Exception ex)
        {}
    }
}