文件 AWS 開發套件範例 GitHub 儲存庫中有更多可用的 [AWS SDK 範例](https://github.com/awsdocs/aws-doc-sdk-examples)。
本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。
# `GetBucketCors` 搭配 AWS SDK 或 CLI 使用
下列程式碼範例示範如何使用 `GetBucketCors`。
------
#### [ .NET ]
**適用於 .NET 的 SDK**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/dotnetv3/S3#code-examples)中設定和執行。
```
///
/// Retrieve the CORS configuration applied to the Amazon S3 bucket.
///
/// The initialized Amazon S3 client object used
/// to retrieve the CORS configuration.
/// The created CORS configuration object.
private static async Task RetrieveCORSConfigurationAsync(AmazonS3Client client)
{
GetCORSConfigurationRequest request = new GetCORSConfigurationRequest()
{
BucketName = BucketName,
};
var response = await client.GetCORSConfigurationAsync(request);
var configuration = response.Configuration;
PrintCORSRules(configuration);
return configuration;
}
```
+ 如需 API 詳細資訊，請參閱*《適用於 .NET 的 AWS SDK API 參考》*中的 [GetBucketCors](https://docs.aws.amazon.com/goto/DotNetSDKV3/s3-2006-03-01/GetBucketCors)。
------
#### [ CLI ]
**AWS CLI**
下列命令會擷取名為 `amzn-s3-demo-bucket` 之儲存貯體的跨來源資源共享組態：
```
aws s3api get-bucket-cors --bucket amzn-s3-demo-bucket
```
輸出：
```
{
"CORSRules": [
{
"AllowedHeaders": [
"*"
],
"ExposeHeaders": [
"x-amz-server-side-encryption"
],
"AllowedMethods": [
"PUT",
"POST",
"DELETE"
],
"MaxAgeSeconds": 3000,
"AllowedOrigins": [
"http://www.example.com"
]
},
{
"AllowedHeaders": [
"Authorization"
],
"MaxAgeSeconds": 3000,
"AllowedMethods": [
"GET"
],
"AllowedOrigins": [
"*"
]
}
]
}
```
+ 如需 API 詳細資訊，請參閱《AWS CLI 命令參考》**中的 [GetBucketCors](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3api/get-bucket-cors.html)。
------
#### [ JavaScript ]
**適用於 JavaScript (v3) 的 SDK**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/s3#code-examples)中設定和執行。
取得儲存貯體的 CORS 政策。
```
import {
GetBucketCorsCommand,
S3Client,
S3ServiceException,
} from "@aws-sdk/client-s3";
/**
* Log the Cross-Origin Resource Sharing (CORS) configuration information
* set for the bucket.
* @param {{ bucketName: string }}
*/
export const main = async ({ bucketName }) => {
const client = new S3Client({});
const command = new GetBucketCorsCommand({
Bucket: bucketName,
});
try {
const { CORSRules } = await client.send(command);
console.log(JSON.stringify(CORSRules));
CORSRules.forEach((cr, i) => {
console.log(
`\nCORSRule ${i + 1}`,
`\n${"-".repeat(10)}`,
`\nAllowedHeaders: ${cr.AllowedHeaders}`,
`\nAllowedMethods: ${cr.AllowedMethods}`,
`\nAllowedOrigins: ${cr.AllowedOrigins}`,
`\nExposeHeaders: ${cr.ExposeHeaders}`,
`\nMaxAgeSeconds: ${cr.MaxAgeSeconds}`,
);
});
} catch (caught) {
if (
caught instanceof S3ServiceException &&
caught.name === "NoSuchBucket"
) {
console.error(
`Error from S3 while getting bucket CORS rules for ${bucketName}. The bucket doesn't exist.`,
);
} else if (caught instanceof S3ServiceException) {
console.error(
`Error from S3 while getting bucket CORS rules for ${bucketName}. ${caught.name}: ${caught.message}`,
);
} else {
throw caught;
}
}
};
```
+ 如需詳細資訊，請參閱《[適用於 JavaScript 的 AWS SDK 開發人員指南](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/s3-example-configuring-buckets.html#s3-example-configuring-buckets-get-cors)》。
+ 如需 API 詳細資訊，請參閱*《適用於 JavaScript 的 AWS SDK API 參考》*中的 [GetBucketCors](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/s3/command/GetBucketCorsCommand)。
------
#### [ Python ]
**適用於 Python 的 SDK (Boto3)**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/s3/s3_basics#code-examples)中設定和執行。
```
class BucketWrapper:
"""Encapsulates S3 bucket actions."""
def __init__(self, bucket):
"""
:param bucket: A Boto3 Bucket resource. This is a high-level resource in Boto3
that wraps bucket actions in a class-like structure.
"""
self.bucket = bucket
self.name = bucket.name
def get_cors(self):
"""
Get the CORS rules for the bucket.
:return The CORS rules for the specified bucket.
"""
try:
cors = self.bucket.Cors()
logger.info(
"Got CORS rules %s for bucket '%s'.", cors.cors_rules, self.bucket.name
)
except ClientError:
logger.exception(("Couldn't get CORS for bucket %s.", self.bucket.name))
raise
else:
return cors
```
+ 如需 API 詳細資訊，請參閱*《適用於 Python (Boto3) 的AWS SDK API 參考》*中的 [GetBucketCors](https://docs.aws.amazon.com/goto/boto3/s3-2006-03-01/GetBucketCors)。
------
#### [ Ruby ]
**SDK for Ruby**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/ruby/example_code/s3#code-examples)中設定和執行。
```
require 'aws-sdk-s3'
# Wraps Amazon S3 bucket CORS configuration.
class BucketCorsWrapper
attr_reader :bucket_cors
# @param bucket_cors [Aws::S3::BucketCors] A bucket CORS object configured with an existing bucket.
def initialize(bucket_cors)
@bucket_cors = bucket_cors
end
# Gets the CORS configuration of a bucket.
#
# @return [Aws::S3::Type::GetBucketCorsOutput, nil] The current CORS configuration for the bucket.
def cors
@bucket_cors.data
rescue Aws::Errors::ServiceError => e
puts "Couldn't get CORS configuration for #{@bucket_cors.bucket.name}. Here's why: #{e.message}"
nil
end
end
```
+ 如需 API 詳細資訊，請參閱*《適用於 Ruby 的 AWS SDK API 參考》*中的 [GetBucketCors](https://docs.aws.amazon.com/goto/SdkForRubyV3/s3-2006-03-01/GetBucketCors)。
------
#### [ SAP ABAP ]
**適用於 SAP ABAP 的開發套件**
GitHub 上提供更多範例。尋找完整範例，並了解如何在 [AWS 程式碼範例儲存庫](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/sap-abap/services/s3#code-examples)中設定和執行。
```
TRY.
oo_result = lo_s3->getbucketcors( " oo_result is returned for testing purposes. "
iv_bucket = iv_bucket_name ).
MESSAGE 'Retrieved bucket CORS configuration.' TYPE 'I'.
CATCH /aws1/cx_s3_nosuchbucket.
MESSAGE 'Bucket does not exist.' TYPE 'E'.
ENDTRY.
```
+ 如需 API 詳細資訊，請參閱《適用於 *AWS SAP ABAP 的 SDK API 參考*》中的 [GetBucketCors](https://docs.aws.amazon.com/sdk-for-sap-abap/v1/api/latest/index.html)。
------