public override Task <StorageUploadParameters> RequestUpload(RequestUploadOptions options)
{
var headers = new Dictionary <string, string>();
if (options.Length > 0)
{
headers.Add("Content-Length", options.Length.ToString());
}
var url = cos.GenerateSignURL(new COSXML.Model.Tag.PreSignatureStruct
{
isHttps = true,
httpMethod = "PUT",
appid = cosConfig.Appid,
bucket = this.bucket,
region = cosConfig.Region,
headers = headers,
key = options.DestFilePath,
});
return(Task.FromResult(new StorageUploadParameters
{
Url = url,
Method = "PUT"
}));
}
/// 获取预签名下载链接
public void GetPresignDownloadUrl()
{
//.cssg-snippet-body-start:[get-presign-download-url]
try
{
PreSignatureStruct preSignatureStruct = new PreSignatureStruct();
preSignatureStruct.appid = "1250000000"; //腾讯云账号 APPID
preSignatureStruct.region = "COS_REGION"; //存储桶地域
preSignatureStruct.bucket = "examplebucket-1250000000"; //存储桶
preSignatureStruct.key = "exampleobject"; //对象键
preSignatureStruct.httpMethod = "GET"; //HTTP 请求方法
preSignatureStruct.isHttps = true; //生成 HTTPS 请求 URL
preSignatureStruct.signDurationSecond = 600; //请求签名时间为600s
preSignatureStruct.headers = null; //签名中需要校验的 header
preSignatureStruct.queryParameters = null; //签名中需要校验的 URL 中请求参数
string requestSignURL = cosXml.GenerateSignURL(preSignatureStruct);
//下载请求预签名 URL (使用永久密钥方式计算的签名 URL)
string localDir = System.IO.Path.GetTempPath(); //本地文件夹
string localFileName = "my-local-temp-file"; //指定本地保存的文件名
GetObjectRequest request = new GetObjectRequest(null, null, localDir, localFileName);
//设置下载请求预签名 URL
request.RequestURLWithSign = requestSignURL;
//设置进度回调
request.SetCosProgressCallback(delegate(long completed, long total)
{
Console.WriteLine(String.Format("progress = {0:##.##}%", completed * 100.0 / total));
});
//执行请求
GetObjectResult result = cosXml.GetObject(request);
//请求成功
Console.WriteLine(result.GetResultInfo());
}
catch (COSXML.CosException.CosClientException clientEx)
{
//请求失败
Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
//请求失败
Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}
//.cssg-snippet-body-end
}
public void Download(string name)
{
try
{
PreSignatureStruct preSignatureStruct = new PreSignatureStruct
{
appid = _cosSettings.AppId, // 腾讯云账号 APPID
region = _cosSettings.Region, // 存储桶地域
bucket = $"{_cosSettings.BucketName}-{_cosSettings.AppId}", // 存储桶
key = name, // 对象键
httpMethod = "GET", // HTTP 请求方法
isHttps = true, // 生成 HTTPS 请求 URL
signDurationSecond = 600, // 请求签名时间为600s
headers = null, // 签名中需要校验的 header
queryParameters = null // 签名中需要校验的 URL 中请求参数
};
string requestSignUrl = _cosXml.GenerateSignURL(preSignatureStruct);
//下载请求预签名 URL (使用永久密钥方式计算的签名 URL)
//string localDir = System.IO.Path.GetTempPath();//本地文件夹
//string localFileName = "my-local-temp-file"; //指定本地保存的文件名
//GetObjectRequest request = new GetObjectRequest(null, null, localDir, localFileName);
////设置下载请求预签名 URL
//request.RequestURLWithSign = requestSignURL;
////设置进度回调
//request.SetCosProgressCallback(delegate (long completed, long total)
//{
// Console.WriteLine(String.Format("progress = {0:##.##}%", completed * 100.0 / total));
//});
////执行请求
//GetObjectResult result = cosXml.GetObject(request);
////请求成功
//Console.WriteLine(result.GetResultInfo());
Console.WriteLine(requestSignUrl);
}
catch (CosClientException clientEx)
{
//请求失败
Console.WriteLine("CosClientException: " + clientEx);
}
catch (CosServerException serverEx)
{
//请求失败
Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}
}
private async Task <string> PresignedObjectAsync(string bucketName, string objectName, int expiresInt, PresignedObjectType type)
{
if (string.IsNullOrEmpty(bucketName))
{
throw new ArgumentNullException(nameof(bucketName));
}
if (string.IsNullOrEmpty(objectName))
{
throw new ArgumentNullException(nameof(objectName));
}
if (expiresInt <= 0)
{
throw new Exception("ExpiresIn time can not less than 0.");
}
if (expiresInt > 7 * 24 * 3600)
{
throw new Exception("ExpiresIn time no more than 7 days.");
}
long nowTime = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
const int minExpiresInt = 600;
string key = Encrypt.MD5($"{bucketName}_{objectName}_{type.ToString().ToUpper()}");
string objectUrl = null;
string newBucketName = ConvertBucketName(bucketName);
PreSignatureStruct preSignatureStruct = new PreSignatureStruct()
{
appid = Options.Endpoint,
region = Options.Region,
bucket = newBucketName,
key = objectName,
httpMethod = type.ToString().ToUpper(),
isHttps = Options.IsEnableHttps,
signDurationSecond = expiresInt,
headers = null,
queryParameters = null,
};
//查找缓存
if (Options.IsEnableCache && (expiresInt > minExpiresInt))
{
var cacheResult = await _cache.GetAsync <PresignedUrlCache>(key);
PresignedUrlCache cache = cacheResult.HasValue ? cacheResult.Value : null;
//缓存中存在，且有效时间不低于10分钟
if (cache != null &&
cache.Type == type &&
cache.CreateTime > 0 &&
(cache.CreateTime + expiresInt - nowTime) > minExpiresInt &&
cache.Name == objectName &&
cache.BucketName == bucketName)
{
return(cache.Url);
}
}
if (type == PresignedObjectType.Get)
{
//生成URL
AccessMode accessMode = await this.GetObjectAclAsync(bucketName, objectName);
if (accessMode == AccessMode.PublicRead || accessMode == AccessMode.PublicReadWrite)
{
objectUrl = $"{(Options.IsEnableHttps ? "https" : "http")}://{newBucketName}.cos.{Options.Region}.myqcloud.com{(objectName.StartsWith("/") ? "" : "/")}{objectName}";
}
else
{
string uri = _client.GenerateSignURL(preSignatureStruct);
if (uri != null)
{
objectUrl = uri.ToString();
}
}
}
else
{
string uri = _client.GenerateSignURL(preSignatureStruct);
if (uri != null)
{
objectUrl = uri.ToString();
}
}
if (string.IsNullOrEmpty(objectUrl))
{
throw new Exception("Presigned get object url failed.");
}
//save cache
if (Options.IsEnableCache && expiresInt > minExpiresInt)
{
PresignedUrlCache urlCache = new PresignedUrlCache()
{
Url = objectUrl,
CreateTime = nowTime,
Name = objectName,
BucketName = bucketName,
Type = type
};
int randomSec = new Random().Next(5, 30);
await _cache.SetAsync(key, urlCache, TimeSpan.FromSeconds(expiresInt + randomSec));
}
return(objectUrl);
}