AWS SDK for C++
The AWS SDK for C++ is a software development kit for integration with AWS services.
Getting started
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Assign to the service account the roles required for your project, e.g., storage.editor for a bucket (to work with a particular bucket) or a folder (to work with all buckets in this folder). For more information about roles, see Access management with Yandex Identity and Access Management.
To work with objects in an encrypted bucket, a user or service account must have the following roles for the encryption key in addition to the
storage.configurerrole:kms.keys.encrypter: To read the key, encrypt and upload objects.kms.keys.decrypter: To read the key, decrypt and download objects.kms.keys.encrypterDecrypter: This role includes thekms.keys.encrypterandkms.keys.decrypterpermissions.
For more information, see Key Management Service service roles.
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As a result, you will get the static access key data. To authenticate in Object Storage, you will need the following:
key_id: Static access key IDsecret: Secret key
Save
key_idandsecret: you will not be able to get the key value again.
Note
A service account is only allowed to view a list of buckets in the folder it was created in.
A service account can perform actions with objects in buckets that are created in folders different from the service account folder. To enable this, assign the service account roles for the appropriate folder or its bucket.
Installation
To install the AWS SDK for C++, use the instructions posted on the developer's site.
Configuration
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Create a directory to store the authentication data in and navigate to it:
For macOS and Linux:
mkdir ~/.aws/For Windows:
mkdir C:\Users\<username>\.aws\ -
In the
.awsdirectory, create a file namedcredentials, copy the credentials you got earlier, and paste them into it:[default] aws_access_key_id = <static_key_ID> aws_secret_access_key = <secret_key> -
Create a file named
configwith the default region settings and copy the following information to it:[default] region = ru-central1 endpoint_url = https://storage.yandexcloud.netNote
Some apps designed to work with Amazon S3 do not allow you to specify the region; this is why Object Storage also accepts the value of the primary AWS region — the first row in the region table.
To access Object Storage, use the https://storage.yandexcloud.net endpoint.
Code examples
See C++ code examples from the developer to interface with S3.
Below is an example of a simple program that illustrates the differences in settings for Yandex Object Storage.
CmakeLists
cmake_minimum_required(VERSION 3.8)
project("s3-examples")
set(CMAKE_CXX_STANDARD 20)
if(NOT BUILD_SHARED_LIBS)
set(BUILD_SHARED_LIBS ON)
endif()
find_package(AWSSDK REQUIRED COMPONENTS s3 sts)
add_executable(EXAMPLE EXAMPLE_FILE_S3.cpp)
target_link_libraries(EXAMPLE ${AWSSDK_LINK_LIBRARIES}
${AWSSDK_PLATFORM_DEPS})
File EXAMPLE_FILE_S3.cpp
#include <aws/core/Aws.h>
#include <aws/core/auth/AWSCredentialsProvider.h>
#include <aws/s3/S3Client.h>
#include <aws/s3/model/Bucket.h>
#include <aws/s3/model/CreateBucketConfiguration.h>
#include <aws/s3/model/CreateBucketRequest.h>
#include <aws/s3/model/DeleteBucketRequest.h>
#include <aws/s3/model/ListObjectsRequest.h>
#include <aws/s3/model/PutObjectRequest.h>
#include <sys/stat.h>
#include <fstream>
#include <iostream>
// Finds the bucket and outputs its contents in the console
bool FindTheBucket(const Aws::S3::S3Client& s3Client, const Aws::String& bucketName)
{
Aws::S3::Model::ListBucketsOutcome outcome = s3Client.ListBuckets();
Aws::S3::Model::ListObjectsRequest request;
if (outcome.IsSuccess()) {
std::cout << "Looking for a bucket named '" << bucketName << "'..." << std::endl;
Aws::Vector<Aws::S3::Model::Bucket> bucket_list = outcome.GetResult().GetBuckets();
for (Aws::S3::Model::Bucket const& bucket : bucket_list) {
if (bucket.GetName() == bucketName) {
request.WithBucket(bucketName);
std::cout << "Found the bucket." << std::endl << std::endl;
auto outcome_obj = s3Client.ListObjects(request);
std::cout << "Objects in bucket '" << bucketName << "':" << std::endl;
Aws::Vector<Aws::S3::Model::Object> objects = outcome_obj.GetResult().GetContents();
for (Aws::S3::Model::Object& object : objects) {
std::cout << object.GetKey() << std::endl;
}
return true;
}
}
std::cout << "Could not find the bucket." << std::endl << std::endl;
return true;
} else {
std::cout << "ListBuckets error: " << outcome.GetError().GetMessage() << std::endl;
}
return false;
}
int main(int argc, char* argv[])
{
Aws::SDKOptions options;
Aws::InitAPI(options);
{
// Settings section for using the AWS SDK with Object Storage
Aws::Client::ClientConfiguration config;
config.region = Aws::String("ru-central1");
config.endpointOverride = Aws::String("storage.yandexcloud.net");
Aws::String bucket_name = "bucket_name";
// Initializing a connection
Aws::S3::S3Client s3_client(config);
FindTheBucket(s3_client, bucket_name);
}
Aws::ShutdownAPI(options);
return 0;
}