Object Storage Service:Hotlink protection (C# SDK V1)

Observações de uso

• Antes de configurar a proteção contra hotlink, familiarize-se com este recurso. Para mais informações, consulte Hotlink protection.

• Este tópico usa o endpoint público da região China (Hangzhou). Para acessar o OSS a partir de outros serviços da Alibaba Cloud na mesma região, use um endpoint interno. Para mais informações sobre regiões e endpoints do OSS, consulte Regions and endpoints.

• Este tópico demonstra como criar uma instância OSSClient com um endpoint do OSS. Para configurações alternativas, como usar um domínio personalizado ou autenticar com credenciais do Security Token Service (STS), consulte Initialization (C# SDK V1).

• Para configurar a proteção contra hotlink, você precisa ter a permissão oss:PutBucketReferer. Para consultar as configurações de proteção contra hotlink, você precisa ter a permissão oss:GetBucketReferer. Para mais informações, consulte Grant a custom policy.

Configurar a proteção contra hotlink para um bucket

O exemplo a seguir configura a proteção contra hotlink para um bucket:

using Aliyun.OSS;
using Aliyun.OSS.Common;
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "yourEndpoint";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. 
var bucketName = "examplebucket";
// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
const string region = "cn-hangzhou";

// Create a ClientConfiguration instance and modify the default parameters based on your requirements.
var conf = new ClientConfiguration();

// Use the signature algorithm V4.
conf.SignatureVersion = SignatureVersion.V4;

// Create an OSSClient instance.
var client = new OssClient(endpoint, accessKeyId, accessKeySecret, conf);
client.SetRegion(region);
try
{
    var refererList = new List<string>();
    // Add a Referer whitelist. You can use asterisks (*) and question marks (?) as wildcard characters in Referers. 
    refererList.Add("http://www.aliyun.com");
    refererList.Add("https://www.aliyun.com");
    // refererList.Add("http://www.help.alibabacloud.com");
    // refererList.Add("http://www.?.aliyuncs.com");
    var srq = new SetBucketRefererRequest(bucketName, refererList);
    // Configure hotlink protection. 
    client.SetBucketReferer(srq);
    Console.WriteLine("Set bucket:{0} Referer succeeded ", bucketName);
}
catch (OssException ex)
{
    Console.WriteLine("Failed with error code: {0}; Error info: {1}. \nRequestID:{2}\tHostID:{3}",
        ex.ErrorCode, ex.Message, ex.RequestId, ex.HostId);
}
catch (Exception ex)
{
    Console.WriteLine("Failed with error info: {0}", ex.Message);
}

Consultar as configurações de proteção contra hotlink

O exemplo a seguir consulta as configurações de proteção contra hotlink de um bucket:

using Aliyun.OSS;
using Aliyun.OSS.Common;
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "yourEndpoint";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. 
var bucketName = "examplebucket";
// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
const string region = "cn-hangzhou";

// Create a ClientConfiguration instance and modify the default parameters based on your requirements.
var conf = new ClientConfiguration();

// Use the signature algorithm V4.
conf.SignatureVersion = SignatureVersion.V4;

// Create an OSSClient instance.
var client = new OssClient(endpoint, accessKeyId, accessKeySecret, conf);
client.SetRegion(region);
try
{
    // Query the hotlink protection configurations of the bucket. 
    var rc = client.GetBucketReferer(bucketName);
    Console.WriteLine("Get bucket:{0} Referer succeeded ", bucketName);
    Console.WriteLine("allow?" + (rc.AllowEmptyReferer ? "yes" : "no"));
    if (rc.RefererList.Referers != null)
    {
        for (var i = 0; i < rc.RefererList.Referers.Length; i++)
            Console.WriteLine(rc.RefererList.Referers[i]);
    }
    else
    {
        Console.WriteLine("Empty Referer List");
    }
}
catch (OssException ex)
{
    Console.WriteLine("Failed with error code: {0}; Error info: {1}. \nRequestID:{2}\tHostID:{3}",
        ex.ErrorCode, ex.Message, ex.RequestId, ex.HostId);
}
catch (Exception ex)
{
    Console.WriteLine("Failed with error info: {0}", ex.Message);
}
finally
{
    client.SetBucketReferer(new SetBucketRefererRequest(bucketName));
}

Limpar as configurações de proteção contra hotlink de um bucket

O exemplo a seguir limpa as configurações de proteção contra hotlink de um bucket:

using Aliyun.OSS;
using Aliyun.OSS.Common;
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "yourEndpoint";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. 
var bucketName = "examplebucket";
// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
const string region = "cn-hangzhou";

// Create a ClientConfiguration instance and modify the default parameters based on your requirements.
var conf = new ClientConfiguration();

// Use the signature algorithm V4.
conf.SignatureVersion = SignatureVersion.V4;

// Create an OSSClient instance.
var client = new OssClient(endpoint, accessKeyId, accessKeySecret, conf);
client.SetRegion(region);
try
{
    // The hotlink protection configurations of a bucket cannot be directly cleared. To overwrite the existing hotlink protection configurations, you must configure a new hotlink protection rule that allows requests with an empty Referer header. 
    var srq = new SetBucketRefererRequest(bucketName);
    client.SetBucketReferer(srq);
    Console.WriteLine("Set bucket:{0} Referer succeeded ", bucketName);
}
catch (OssException ex)
{
    Console.WriteLine("Failed with error code: {0}; Error info: {1}. \nRequestID:{2}\tHostID:{3}",
        ex.ErrorCode, ex.Message, ex.RequestId, ex.HostId);
}
catch (Exception ex)
{
    Console.WriteLine("Failed with error info: {0}", ex.Message);
}

Referências

• Para visualizar o código de exemplo completo de proteção contra hotlink, visite o repositório no GitHub.

• Para mais informações sobre a operação de API para configurar a proteção contra hotlink de um bucket, consulte PutBucketReferer.

• Para mais informações sobre a operação de API para consultar as configurações de proteção contra hotlink de um bucket, consulte GetBucketReferer.