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Bucket Policy是OSS提供的一種針對存儲空間（Bucket）的授權(quán)策略，使您可以精細化地授權(quán)或限制有身份的訪問者（阿里云賬號、RAM用戶、RAM角色）或匿名訪問者對指定OSS資源的訪問。例如，您可以為其他阿里云賬號的RAM用戶授予指定OSS資源的只讀權(quán)限。

注意事項

在配置Bucket Policy之前，請確保您已了解該功能。詳情請參見Bucket Policy。

本文以華東1（杭州）外網(wǎng)Endpoint為例。如果您希望通過與OSS同地域的其他阿里云產(chǎn)品訪問OSS，請使用內(nèi)網(wǎng)Endpoint。關(guān)于OSS支持的Region與Endpoint的對應關(guān)系，請參見OSS地域和訪問域名。
本文以OSS域名新建OSSClient為例。如果您希望通過自定義域名、STS等方式新建OSSClient，請參見新建OssClient。
要設(shè)置Bucket Policy，您必須有oss:PutBucketPolicy權(quán)限；要獲取Bucket Policy，您必須有oss:GetBucketPolicy權(quán)限；要刪除Bucket Policy，您必須有oss:DeleteBucketPolicy權(quán)限。具體操作，請參見為RAM用戶授權(quán)自定義的權(quán)限策略。

設(shè)置Bucket Policy

以下代碼用于設(shè)置Bucket Policy：

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)腅ndpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    / *yourRegion填寫B(tài)ucket所在地域?qū)腞egion。以華東1（杭州）為例，Region填寫為cn - hangzhou。 * /
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網(wǎng)絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* 以下示例用于資源擁有者（即UID為174649585760xxxx的Bucket Owner）通過Bucket Policy授權(quán)指定用戶（UID為20214760404935xxxx的RAM用戶）擁有列舉examplebucket下所有文件的權(quán)限。*/
    std::string policy = 
        R"(
        {
            "Statement": [
            {
                "Action": [
                    "oss:GetObject",
                    "oss:ListObjects"
                ],
                "Principal": [
                    "20214760404935xxxx"           
                ],
                "Effect" : "Allow",
                "Resource" : ["acs:oss:*:174649585760xxxx:examplebucket/*"]
            }
            ],
                "Version": "1"
        }
        )";
    SetBucketPolicyRequest request(BucketName);
    request.setPolicy(policy);
    auto outcome = client.SetBucketPolicy(request);

    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "Set Bucket Policy fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
    }

    /* 釋放網(wǎng)絡等資源。*/
    ShutdownSdk();
    return 0;
}

獲取Bucket Policy

以下代碼用于獲取Bucket Policy信息：

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)腅ndpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    / *yourRegion填寫B(tài)ucket所在地域?qū)腞egion。以華東1（杭州）為例，Region填寫為cn - hangzhou。 * /
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網(wǎng)絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* 獲取Bucket Policy配置信息。*/
    GetBucketPolicyRequest request(BucketName);
    auto outcome = client.GetBucketPolicy(request);

    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "Get Bucket Policy fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            return -1;
    }

    /* 打印配置信息。*/
    std::cout << outcome.result().Policy() << std::endl;

    /* 釋放網(wǎng)絡等資源。*/
    ShutdownSdk();
    return 0;
}

刪除Bucket Policy

以下代碼用于刪除Bucket Policy：

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
    /* yourEndpoint填寫B(tài)ucket所在地域?qū)腅ndpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    / *yourRegion填寫B(tài)ucket所在地域?qū)腞egion。以華東1（杭州）為例，Region填寫為cn - hangzhou。 * /
    std::string Region = "yourRegion";
    /* 填寫B(tài)ucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網(wǎng)絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環(huán)境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設(shè)置環(huán)境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* 刪除Bucket Policy。*/
    DeleteBucketPolicyRequest request(BucketName);
    auto outcome = client.DeleteBucketPolicy(request);

    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "Delete Bucket Policy fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
    }

    /* 釋放網(wǎng)絡等資源。*/
    ShutdownSdk();
    return 0;
}

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通過C++配置Bucket Policy

注意事項

設(shè)置Bucket Policy

獲取Bucket Policy

刪除Bucket Policy

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