使用 Amazon SDK 从多区域接入点中获取 Amazon S3 对象

将 S3 客户端配置为使用非对称 Sigv4（Sigv4a）签名算法。

        suspend fun createS3Client(): S3Client {
            // Configure your S3Client to use the Asymmetric Sigv4 (Sigv4a) signing algorithm.
            val sigV4AScheme = SigV4AsymmetricAuthScheme(CrtAwsSigner)
            val s3 = S3Client.fromEnvironment {
                authSchemes = listOf(sigV4AScheme)
            }
            return s3
        }

使用多区域接入点 ARN 而不是桶名称来检索对象。

    suspend fun getObjectFromMrap(s3: S3Client, mrapArn: String, keyName: String): String? {
        val request = GetObjectRequest {
            bucket = mrapArn // Use the ARN instead of the bucket name for object operations.
            key = keyName
        }

        var stringObj: String? = null
        s3.getObject(request) { resp ->
            stringObj = resp.body?.decodeToString()
            if (stringObj != null) {
                println("Successfully read $keyName from $mrapArn")
            }
        }
        return stringObj
    }