使用临时URL进行授权访问

开发过程中，您有任何问题可以在github上提交issue。接口参考文档详细介绍了每个接口的参数和使用方法。

OBS客户端支持通过访问密钥、请求方法类型、请求参数等信息生成一个在Query参数中携带鉴权信息的URL，可将该URL提供给其他用户进行临时访问。在生成URL时，您需要指定URL的有效期来限制访客用户的访问时长。

如果您想授予其他用户对桶或对象临时进行其他操作的权限（例如上传或下载对象），则需要生成带对应请求的URL后（例如使用生成PUT请求的URL上传对象），将该URL提供给其他用户。

通过该方式可支持的操作以及相关信息见下表：

操作名	HTTP请求方法（OBS .NET SDK对应值）	子资源（OBS .NET SDK对应值）	是否需要桶名	是否需要对象名
创建桶	HttpVerb.PUT	N/A	是	否
获取桶列表	HttpVerb.GET	N/A	否	否
删除桶	HttpVerb.DELETE	N/A	是	否
列举桶内对象	HttpVerb.GET	N/A	是	否
列举桶内多版本对象	HttpVerb.GET	SubResourceEnum.Versions	是	否
列举分段上传任务	HttpVerb.GET	SubResourceEnum.Uploads	是	否
获取桶元数据	HttpVerb.HEAD	N/A	是	否
获取桶区域位置	HttpVerb.GET	SubResourceEnum.Location	是	否
获取桶存量信息	HttpVerb.GET	SubResourceEnum.StorageInfo	是	否
设置桶配额	HttpVerb.PUT	SubResourceEnum.Quota	是	否
获取桶配额	HttpVerb.GET	SubResourceEnum.Quota	是	否
设置桶存储类型	HttpVerb.PUT	SubResourceEnum.StoragePolicy	是	否
获取桶存储类型	HttpVerb.GET	SubResourceEnum.StoragePolicy	是	否
桶ACL	HttpVerb.PUT	SubResourceEnum.Acl	是	否
获取桶ACL	HttpVerb.GET	SubResourceEnum.Acl	是	否
开启/关闭桶日志	HttpVerb.PUT	SubResourceEnum.Logging	是	否
查看桶日志	HttpVerb.GET	SubResourceEnum.Logging	是	否
设置桶策略	HttpVerb.PUT	SubResourceEnum.Policy	是	否
查看桶策略	HttpVerb.GET	SubResourceEnum.Policy	是	否
删除桶策略	HttpVerb.DELETE	SubResourceEnum.Policy	是	否
设置生命周期规则	HttpVerb.PUT	SubResourceEnum.Lifecycle	是	否
查看生命周期规则	HttpVerb.GET	SubResourceEnum.Lifecycle	是	否
删除生命周期规则	HttpVerb.DELETE	SubResourceEnum.Lifecycle	是	否
设置托管配置	HttpVerb.PUT	SubResourceEnum.Website	是	否
查看托管配置	HttpVerb.GET	SubResourceEnum.Website	是	否
清除托管配置	HttpVerb.DELETE	SubResourceEnum.Website	是	否
设置桶多版本状态	HttpVerb.PUT	SubResourceEnum.Versioning	是	否
查看桶多版本状态	HttpVerb.GET	SubResourceEnum.Versioning	是	否
设置跨域规则	HttpVerb.PUT	SubResourceEnum.Cors	是	否
查看跨域规则	HttpVerb.GET	SubResourceEnum.Cors	是	否
删除跨域规则	HttpVerb.DELETE	SubResourceEnum.Cors	是	否
设置桶标签	HttpVerb.PUT	SubResourceEnum.Tagging	是	否
查看桶标签	HttpVerb.GET	SubResourceEnum.Tagging	是	否
删除桶标签	HttpVerb.DELETE	SubResourceEnum.Tagging	是	否
上传对象	HttpVerb.PUT	N/A	是	是
追加上传	HttpVerb.POST	SubResourceEnum.Append	是	是
下载对象	HttpVerb.GET	N/A	是	是
复制对象	HttpVerb.PUT	N/A	是	是
删除对象	HttpVerb.DELETE	N/A	是	是
批量删除对象	HttpVerb.POST	SubResourceEnum.Delete	是	是
获取对象属性	HttpVerb.HEAD	N/A	是	是
设置对象ACL	HttpVerb.PUT	SubResourceEnum.Acl	是	是
查看对象ACL	HttpVerb.GET	SubResourceEnum.Acl	是	是
初始化分段上传任务	HttpVerb.POST	SubResourceEnum.Uploads	是	是
上传段	HttpVerb.PUT	N/A	是	是
复制段	HttpVerb.PUT	N/A	是	是
列举已上传的段	HttpVerb.GET	N/A	是	是
合并段	HttpVerb.POST	N/A	是	是
取消分段上传任务	HttpVerb.DELETE	N/A	是	是
恢复归档存储对象	HttpVerb.POST	SubResourceEnum.Restore	是	是

通过OBS .NET SDK生成临时URL访问OBS的步骤如下：

通过ObsClient.CreateTemporarySignature生成带签名信息的URL。
使用任意HTTP库发送HTTP/HTTPS请求，访问OBS服务。

如果遇到跨域报错、签名不匹配问题，请参考以下步骤排查问题：

未配置跨域，需要在控制台配置CORS规则，请参考配置桶允许跨域请求。
签名计算问题，请参考URL中携带签名排查签名参数是否正确；比如上传对象功能，后端将Content-Type参与计算签名生成授权URL，但是前端使用授权URL时没有设置Content-Type字段或者传入错误的值，此时会出现跨域错误。解决方案为：Content-Type字段前后端保持一致。

以下代码展示了如何使用临时URL进行授权访问，包括：创建桶、上传对象、下载对象、列举对象、删除对象。

创建桶

// 初始化配置参数
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量AccessKeyID和SecretAccessKey。
// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/intl/zh-cn/usermanual-ca/ca_01_0003.html
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// 创建ObsClient实例
ObsClient client = new ObsClient(accessKey, secretKey, config);

// URL有效期，3600秒
long exipreSeconds = 3600;

CreateTemporarySignatureRequest request = new CreateTemporarySignatureRequest();
request.BucketName = "bucketname";
request.Method = HttpVerb.PUT;
request.Expires = exipreSeconds;

CreateTemporarySignatureResponse response = client.CreateTemporarySignature(request);
Console.WriteLine("Creating bucket using temporary signature url:");
Console.WriteLine("\t" + response.SignUrl);

// 使用PUT请求创建桶
HttpWebRequest webRequest = WebRequest.Create(response.SignUrl) as HttpWebRequest;
webRequest.Method = "PUT";


foreach (KeyValuePair<string, string> header in response.ActualSignedRequestHeaders)
{
    if (!header.Key.Equals("host", StringComparison.OrdinalIgnoreCase))
    {
        webRequest.Headers.Add(header.Key, header.Value);
    }
}

string location = "your bucket location";
            
webRequest.SendChunked = true;
webRequest.AllowWriteStreamBuffering = false;
using (Stream requestStream = webRequest.GetRequestStream())
{
    byte[] buffer = Encoding.UTF8.GetBytes("<CreateBucketConfiguration><LocationConstraint>" + location + "</LocationConstraint></CreateBucketConfiguration>");
    requestStream.Write(buffer, 0, buffer.Length);
}

HttpWebResponse webResponse = null;
try
{
    webResponse = webRequest.GetResponse() as HttpWebResponse;
}
catch (WebException ex)
{
    webResponse = ex.Response as HttpWebResponse;
}
Console.WriteLine("Response Status:" + Convert.ToInt32(webResponse.StatusCode));
using (MemoryStream dest = new MemoryStream())
{
    using (Stream stream = webResponse.GetResponseStream())
    {
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
        {
            dest.Write(buffer, 0, bytesRead);
        }

    }
    Console.WriteLine("Response Content:");
    Console.WriteLine(Encoding.UTF8.GetString(dest.ToArray()));
}

上传对象

// 初始化配置参数
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量AccessKeyID和SecretAccessKey。
// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/intl/zh-cn/usermanual-ca/ca_01_0003.html
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// 创建ObsClient实例
ObsClient client = new ObsClient(accessKey, secretKey, config);

// URL有效期，3600秒
long exipreSeconds = 3600;

CreateTemporarySignatureRequest request = new CreateTemporarySignatureRequest();
request.BucketName = "bucketname";
request.ObjectKey = "objectkey";         
request.Method = HttpVerb.PUT;
request.Expires = exipreSeconds;

CreateTemporarySignatureResponse response = client.CreateTemporarySignature(request);
Console.WriteLine("Creating object using temporary signature url:");
Console.WriteLine("\t" + response.SignUrl);

// 使用PUT请求上传对象
HttpWebRequest webRequest = WebRequest.Create(response.SignUrl) as HttpWebRequest;
webRequest.Method = "PUT";


foreach (KeyValuePair<string, string> header in response.ActualSignedRequestHeaders)
{
    if (!header.Key.Equals("host", StringComparison.OrdinalIgnoreCase))
    {
        webRequest.Headers.Add(header.Key, header.Value);
    }
}
            
webRequest.SendChunked = true;
webRequest.AllowWriteStreamBuffering = false;
using (Stream requestStream = webRequest.GetRequestStream())
{
    byte[] buffer = Encoding.UTF8.GetBytes("Hello OBS");
    requestStream.Write(buffer, 0, buffer.Length);
}

HttpWebResponse webResponse = null;
try
{
    webResponse = webRequest.GetResponse() as HttpWebResponse;
}
catch (WebException ex)
{
    webResponse = ex.Response as HttpWebResponse;
}
Console.WriteLine("Response Status:" + Convert.ToInt32(webResponse.StatusCode));
using (MemoryStream dest = new MemoryStream())
{
    using (Stream stream = webResponse.GetResponseStream())
    {
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
        {
            dest.Write(buffer, 0, bytesRead);
        }

    }
    Console.WriteLine("Response Content:");
    Console.WriteLine(Encoding.UTF8.GetString(dest.ToArray()));
}

下载对象

// 初始化配置参数
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量AccessKeyID和SecretAccessKey。
// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/intl/zh-cn/usermanual-ca/ca_01_0003.html
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// 创建ObsClient实例
ObsClient client = new ObsClient(accessKey, secretKey, config);

// URL有效期，3600秒
long exipreSeconds = 3600;

CreateTemporarySignatureRequest request = new CreateTemporarySignatureRequest();
request.BucketName = "bucketname";
request.ObjectKey = "objectkey";         
request.Method = HttpVerb.GET;
request.Expires = exipreSeconds;

CreateTemporarySignatureResponse response = client.CreateTemporarySignature(request);
Console.WriteLine("Getting object using temporary signature url:");
Console.WriteLine("\t" + response.SignUrl);

// 使用GET请求下载对象
HttpWebRequest webRequest = WebRequest.Create(response.SignUrl) as HttpWebRequest;
webRequest.Method = "GET";


foreach (KeyValuePair<string, string> header in response.ActualSignedRequestHeaders)
{
    if (!header.Key.Equals("host", StringComparison.OrdinalIgnoreCase))
    {
        webRequest.Headers.Add(header.Key, header.Value);
    }
}
            
HttpWebResponse webResponse = null;
try
{
    webResponse = webRequest.GetResponse() as HttpWebResponse;
}
catch (WebException ex)
{
    webResponse = ex.Response as HttpWebResponse;
}
Console.WriteLine("Response Status:" + Convert.ToInt32(webResponse.StatusCode));
using (MemoryStream dest = new MemoryStream())
{
    using (Stream stream = webResponse.GetResponseStream())
    {
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
        {
            dest.Write(buffer, 0, bytesRead);
        }

    }
    Console.WriteLine("Response Content:");
    Console.WriteLine(Encoding.UTF8.GetString(dest.ToArray()));
}

列举对象

// 初始化配置参数
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量AccessKeyID和SecretAccessKey。
// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/intl/zh-cn/usermanual-ca/ca_01_0003.html
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// 创建ObsClient实例
ObsClient client = new ObsClient(accessKey, secretKey, config);

// URL有效期，3600秒
long exipreSeconds = 3600;

CreateTemporarySignatureRequest request = new CreateTemporarySignatureRequest();
request.BucketName = "bucketname";
request.Method = HttpVerb.GET;
request.Expires = exipreSeconds;

CreateTemporarySignatureResponse response = client.CreateTemporarySignature(request);
Console.WriteLine("Getting object list using temporary signature url:");
Console.WriteLine("\t" + response.SignUrl);

// 使用GET请求获取对象列表
HttpWebRequest webRequest = WebRequest.Create(response.SignUrl) as HttpWebRequest;
webRequest.Method = "GET";


foreach (KeyValuePair<string, string> header in response.ActualSignedRequestHeaders)
{
    if (!header.Key.Equals("host", StringComparison.OrdinalIgnoreCase))
    {
        webRequest.Headers.Add(header.Key, header.Value);
    }
}
            
HttpWebResponse webResponse = null;
try
{
    webResponse = webRequest.GetResponse() as HttpWebResponse;
}
catch (WebException ex)
{
    webResponse = ex.Response as HttpWebResponse;
}
Console.WriteLine("Response Status:" + Convert.ToInt32(webResponse.StatusCode));
using (MemoryStream dest = new MemoryStream())
{
    using (Stream stream = webResponse.GetResponseStream())
    {
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
        {
            dest.Write(buffer, 0, bytesRead);
        }

    }
    Console.WriteLine("Response Content:");
    Console.WriteLine(Encoding.UTF8.GetString(dest.ToArray()));
}

删除对象

// 初始化配置参数
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量AccessKeyID和SecretAccessKey。
// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/intl/zh-cn/usermanual-ca/ca_01_0003.html
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// 创建ObsClient实例
ObsClient client = new ObsClient(accessKey, secretKey, config);

// URL有效期，3600秒
long exipreSeconds = 3600;

CreateTemporarySignatureRequest request = new CreateTemporarySignatureRequest();
request.BucketName = "bucketname";
request.ObjectKey = "objectkey";
request.Method = HttpVerb.DELETE;
request.Expires = exipreSeconds;

CreateTemporarySignatureResponse response = client.CreateTemporarySignature(request);
Console.WriteLine("Deleting object using temporary signature url:");
Console.WriteLine("\t" + response.SignUrl);

// 使用DELETE请求删除对象
HttpWebRequest webRequest = WebRequest.Create(response.SignUrl) as HttpWebRequest;
webRequest.Method = "DELETE";


foreach (KeyValuePair<string, string> header in response.ActualSignedRequestHeaders)
{
    if (!header.Key.Equals("host", StringComparison.OrdinalIgnoreCase))
    {
        webRequest.Headers.Add(header.Key, header.Value);
    }
}
            
HttpWebResponse webResponse = null;
try
{
    webResponse = webRequest.GetResponse() as HttpWebResponse;
}
catch (WebException ex)
{
    webResponse = ex.Response as HttpWebResponse;
}
Console.WriteLine("Response Status:" + Convert.ToInt32(webResponse.StatusCode));
using (MemoryStream dest = new MemoryStream())
{
    using (Stream stream = webResponse.GetResponseStream())
    {
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
        {
            dest.Write(buffer, 0, bytesRead);
        }

    }
    Console.WriteLine("Response Content:");
    Console.WriteLine(Encoding.UTF8.GetString(dest.ToArray()));
}

HttpVerb是OBS .NET SDK定义的枚举类型，代表请求方法类型。

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