IAM examples using SDK for C++

Code for the CMakeLists.txt CMake file.

# Set the minimum required version of CMake for this project.
cmake_minimum_required(VERSION 3.13)

# Set the AWS service components used by this project.
set(SERVICE_COMPONENTS iam)

# Set this project's name.
project("hello_iam")

# Set the C++ standard to use to build this target.
# At least C++ 11 is required for the AWS SDK for C++.
set(CMAKE_CXX_STANDARD 11)

# Use the MSVC variable to determine if this is a Windows build.
set(WINDOWS_BUILD ${MSVC})

if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK.
    string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all")
    list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH})
endif ()

# Find the AWS SDK for C++ package.
find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS})

if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS)
    # Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging.

    # set(BIN_SUB_DIR "/Debug") # if you are building from the command line you may need to uncomment this
    # and set the proper subdirectory to the executables' location.

    AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR})
endif ()

add_executable(${PROJECT_NAME}
        hello_iam.cpp)

target_link_libraries(${PROJECT_NAME}
        ${AWSSDK_LINK_LIBRARIES})

Code for the iam.cpp source file.

#include <aws/core/Aws.h>
#include <aws/iam/IAMClient.h>
#include <aws/iam/model/ListPoliciesRequest.h>
#include <iostream>
#include <iomanip>

/*
 *  A "Hello IAM" starter application which initializes an AWS Identity and Access Management (IAM) client
 *  and lists the IAM policies.
 *
 *  main function
 *
 *  Usage: 'hello_iam'
 *
 */

int main(int argc, char **argv) {
    Aws::SDKOptions options;
    // Optionally change the log level for debugging.
//   options.loggingOptions.logLevel = Utils::Logging::LogLevel::Debug;
    Aws::InitAPI(options); // Should only be called once.
    int result = 0;
    {
        const Aws::String DATE_FORMAT("%Y-%m-%d");
        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

        Aws::IAM::IAMClient iamClient(clientConfig);
        Aws::IAM::Model::ListPoliciesRequest request;

        bool done = false;
        bool header = false;
        while (!done) {
            auto outcome = iamClient.ListPolicies(request);
            if (!outcome.IsSuccess()) {
                std::cerr << "Failed to list iam policies: " <<
                          outcome.GetError().GetMessage() << std::endl;
                result = 1;
                break;
            }

            if (!header) {
                std::cout << std::left << std::setw(55) << "Name" <<
                          std::setw(30) << "ID" << std::setw(80) << "Arn" <<
                          std::setw(64) << "Description" << std::setw(12) <<
                          "CreateDate" << std::endl;
                header = true;
            }

            const auto &policies = outcome.GetResult().GetPolicies();
            for (const auto &policy: policies) {
                std::cout << std::left << std::setw(55) <<
                          policy.GetPolicyName() << std::setw(30) <<
                          policy.GetPolicyId() << std::setw(80) << policy.GetArn() <<
                          std::setw(64) << policy.GetDescription() << std::setw(12) <<
                          policy.GetCreateDate().ToGmtString(DATE_FORMAT.c_str()) <<
                          std::endl;
            }

            if (outcome.GetResult().GetIsTruncated()) {
                request.SetMarker(outcome.GetResult().GetMarker());
            } else {
                done = true;
            }
        }
    }


    Aws::ShutdownAPI(options); // Should only be called once.
    return result;
}

bool AwsDoc::IAM::attachRolePolicy(const Aws::String &roleName,
                                   const Aws::String &policyArn,
                                   const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::ListAttachedRolePoliciesRequest list_request;
    list_request.SetRoleName(roleName);

    bool done = false;
    while (!done) {
        auto list_outcome = iam.ListAttachedRolePolicies(list_request);
        if (!list_outcome.IsSuccess()) {
            std::cerr << "Failed to list attached policies of role " <<
                      roleName << ": " << list_outcome.GetError().GetMessage() <<
                      std::endl;
            return false;
        }

        const auto &policies = list_outcome.GetResult().GetAttachedPolicies();
        if (std::any_of(policies.cbegin(), policies.cend(),
                        [=](const Aws::IAM::Model::AttachedPolicy &policy) {
                                return policy.GetPolicyArn() == policyArn;
                        })) {
            std::cout << "Policy " << policyArn <<
                      " is already attached to role " << roleName << std::endl;
            return true;
        }

        done = !list_outcome.GetResult().GetIsTruncated();
        list_request.SetMarker(list_outcome.GetResult().GetMarker());
    }

    Aws::IAM::Model::AttachRolePolicyRequest request;
    request.SetRoleName(roleName);
    request.SetPolicyArn(policyArn);

    Aws::IAM::Model::AttachRolePolicyOutcome outcome = iam.AttachRolePolicy(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Failed to attach policy " << policyArn << " to role " <<
                  roleName << ": " << outcome.GetError().GetMessage() << std::endl;
    }
    else {
        std::cout << "Successfully attached policy " << policyArn << " to role " <<
                  roleName << std::endl;
    }

    return outcome.IsSuccess();
}

Aws::String AwsDoc::IAM::createAccessKey(const Aws::String &userName,
                                         const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::CreateAccessKeyRequest request;
    request.SetUserName(userName);

    Aws::String result;
    Aws::IAM::Model::CreateAccessKeyOutcome outcome = iam.CreateAccessKey(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error creating access key for IAM user " << userName
                  << ":" << outcome.GetError().GetMessage() << std::endl;
    }
    else {
        const auto &accessKey = outcome.GetResult().GetAccessKey();
        std::cout << "Successfully created access key for IAM user " <<
                  userName << std::endl << "  aws_access_key_id = " <<
                  accessKey.GetAccessKeyId() << std::endl <<
                  " aws_secret_access_key = " << accessKey.GetSecretAccessKey() <<
                  std::endl;
        result = accessKey.GetAccessKeyId();
    }

    return result;
}

bool AwsDoc::IAM::createAccountAlias(const Aws::String &aliasName,
                                     const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::CreateAccountAliasRequest request;
    request.SetAccountAlias(aliasName);

    Aws::IAM::Model::CreateAccountAliasOutcome outcome = iam.CreateAccountAlias(
            request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error creating account alias " << aliasName << ": "
                  << outcome.GetError().GetMessage() << std::endl;
    }
    else {
        std::cout << "Successfully created account alias " << aliasName <<
                  std::endl;
    }

    return outcome.IsSuccess();
}

Aws::String AwsDoc::IAM::createPolicy(const Aws::String &policyName,
                                      const Aws::String &rsrcArn,
                                      const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::CreatePolicyRequest request;
    request.SetPolicyName(policyName);
    request.SetPolicyDocument(BuildSamplePolicyDocument(rsrcArn));

    Aws::IAM::Model::CreatePolicyOutcome outcome = iam.CreatePolicy(request);
    Aws::String result;
    if (!outcome.IsSuccess()) {
        std::cerr << "Error creating policy " << policyName << ": " <<
                  outcome.GetError().GetMessage() << std::endl;
    }
    else {
        result = outcome.GetResult().GetPolicy().GetArn();
        std::cout << "Successfully created policy " << policyName <<
                  std::endl;
    }

    return result;
}

Aws::String AwsDoc::IAM::BuildSamplePolicyDocument(const Aws::String &rsrc_arn) {
    std::stringstream stringStream;
    stringStream << "{"
                 << "  \"Version\": \"2012-10-17\","
                 << "  \"Statement\": ["
                 << "    {"
                 << "        \"Effect\": \"Allow\","
                 << "        \"Action\": \"logs:CreateLogGroup\","
                 << "        \"Resource\": \""
                 << rsrc_arn
                 << "\""
                 << "    },"
                 << "    {"
                 << "        \"Effect\": \"Allow\","
                 << "        \"Action\": ["
                 << "            \"dynamodb:DeleteItem\","
                 << "            \"dynamodb:GetItem\","
                 << "            \"dynamodb:PutItem\","
                 << "            \"dynamodb:Scan\","
                 << "            \"dynamodb:UpdateItem\""
                 << "       ],"
                 << "       \"Resource\": \""
                 << rsrc_arn
                 << "\""
                 << "    }"
                 << "   ]"
                 << "}";

    return stringStream.str();
}

bool AwsDoc::IAM::createIamRole(
        const Aws::String &roleName,
        const Aws::String &policy,
        const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient client(clientConfig);
    Aws::IAM::Model::CreateRoleRequest request;

    request.SetRoleName(roleName);
    request.SetAssumeRolePolicyDocument(policy);

    Aws::IAM::Model::CreateRoleOutcome outcome = client.CreateRole(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error creating role. " <<
                  outcome.GetError().GetMessage() << std::endl;
    }
    else {
        const Aws::IAM::Model::Role iamRole = outcome.GetResult().GetRole();
        std::cout << "Created role " << iamRole.GetRoleName() << "\n";
        std::cout << "ID: " << iamRole.GetRoleId() << "\n";
        std::cout << "ARN: " << iamRole.GetArn() << std::endl;
    }

    return outcome.IsSuccess();
}

    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::CreateUserRequest create_request;
    create_request.SetUserName(userName);

    auto create_outcome = iam.CreateUser(create_request);
    if (!create_outcome.IsSuccess()) {
        std::cerr << "Error creating IAM user " << userName << ":" <<
                  create_outcome.GetError().GetMessage() << std::endl;
    }
    else {
        std::cout << "Successfully created IAM user " << userName << std::endl;
    }

    return create_outcome.IsSuccess();

bool AwsDoc::IAM::deleteAccessKey(const Aws::String &userName,
                                  const Aws::String &accessKeyID,
                                  const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::DeleteAccessKeyRequest request;
    request.SetUserName(userName);
    request.SetAccessKeyId(accessKeyID);

    auto outcome = iam.DeleteAccessKey(request);

    if (!outcome.IsSuccess()) {
        std::cerr << "Error deleting access key " << accessKeyID << " from user "
                  << userName << ": " << outcome.GetError().GetMessage() <<
                  std::endl;
    }
    else {
        std::cout << "Successfully deleted access key " << accessKeyID
                  << " for IAM user " << userName << std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::deleteAccountAlias(const Aws::String &accountAlias,
                                     const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::DeleteAccountAliasRequest request;
    request.SetAccountAlias(accountAlias);

    const auto outcome = iam.DeleteAccountAlias(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error deleting account alias " << accountAlias << ": "
                  << outcome.GetError().GetMessage() << std::endl;
    }
    else {
        std::cout << "Successfully deleted account alias " << accountAlias <<
                  std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::deletePolicy(const Aws::String &policyArn,
                               const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::DeletePolicyRequest request;
    request.SetPolicyArn(policyArn);

    auto outcome = iam.DeletePolicy(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error deleting policy with arn " << policyArn << ": "
                  << outcome.GetError().GetMessage() << std::endl;
    }
    else {
        std::cout << "Successfully deleted policy with arn " << policyArn
                  << std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::deleteServerCertificate(const Aws::String &certificateName,
                                          const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::DeleteServerCertificateRequest request;
    request.SetServerCertificateName(certificateName);

    const auto outcome = iam.DeleteServerCertificate(request);
    bool result = true;
    if (!outcome.IsSuccess()) {
        if (outcome.GetError().GetErrorType() != Aws::IAM::IAMErrors::NO_SUCH_ENTITY) {
            std::cerr << "Error deleting server certificate " << certificateName <<
                      ": " << outcome.GetError().GetMessage() << std::endl;
            result = false;
        }
        else {
            std::cout << "Certificate '" << certificateName
                      << "' not found." << std::endl;
        }
    }
    else {
        std::cout << "Successfully deleted server certificate " << certificateName
                  << std::endl;
    }

    return result;
}

    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::DeleteUserRequest request;
    request.SetUserName(userName);
    auto outcome = iam.DeleteUser(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error deleting IAM user " << userName << ": " <<
                  outcome.GetError().GetMessage() << std::endl;;
    }
    else {
        std::cout << "Successfully deleted IAM user " << userName << std::endl;
    }

    return outcome.IsSuccess();

    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::DetachRolePolicyRequest detachRequest;
    detachRequest.SetRoleName(roleName);
    detachRequest.SetPolicyArn(policyArn);

    auto detachOutcome = iam.DetachRolePolicy(detachRequest);
    if (!detachOutcome.IsSuccess()) {
        std::cerr << "Failed to detach policy " << policyArn << " from role "
                  << roleName << ": " << detachOutcome.GetError().GetMessage() <<
                  std::endl;
    }
    else {
        std::cout << "Successfully detached policy " << policyArn << " from role "
                  << roleName << std::endl;
    }

    return detachOutcome.IsSuccess();

bool AwsDoc::IAM::accessKeyLastUsed(const Aws::String &secretKeyID,
                                    const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::GetAccessKeyLastUsedRequest request;

    request.SetAccessKeyId(secretKeyID);

    Aws::IAM::Model::GetAccessKeyLastUsedOutcome outcome = iam.GetAccessKeyLastUsed(
            request);

    if (!outcome.IsSuccess()) {
        std::cerr << "Error querying last used time for access key " <<
                  secretKeyID << ":" << outcome.GetError().GetMessage() << std::endl;
    }
    else {
        Aws::String lastUsedTimeString =
                outcome.GetResult()
                        .GetAccessKeyLastUsed()
                        .GetLastUsedDate()
                        .ToGmtString(Aws::Utils::DateFormat::ISO_8601);
        std::cout << "Access key " << secretKeyID << " last used at time " <<
                  lastUsedTimeString << std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::getPolicy(const Aws::String &policyArn,
                            const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::GetPolicyRequest request;
    request.SetPolicyArn(policyArn);

    auto outcome = iam.GetPolicy(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error getting policy " << policyArn << ": " <<
                  outcome.GetError().GetMessage() << std::endl;
    }
    else {
        const auto &policy = outcome.GetResult().GetPolicy();
        std::cout << "Name: " << policy.GetPolicyName() << std::endl <<
                  "ID: " << policy.GetPolicyId() << std::endl << "Arn: " <<
                  policy.GetArn() << std::endl << "Description: " <<
                  policy.GetDescription() << std::endl << "CreateDate: " <<
                  policy.GetCreateDate().ToGmtString(Aws::Utils::DateFormat::ISO_8601)
                  << std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::getServerCertificate(const Aws::String &certificateName,
                                       const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::GetServerCertificateRequest request;
    request.SetServerCertificateName(certificateName);

    auto outcome = iam.GetServerCertificate(request);
    bool result = true;
    if (!outcome.IsSuccess()) {
        if (outcome.GetError().GetErrorType() != Aws::IAM::IAMErrors::NO_SUCH_ENTITY) {
            std::cerr << "Error getting server certificate " << certificateName <<
                      ": " << outcome.GetError().GetMessage() << std::endl;
            result = false;
        }
        else {
            std::cout << "Certificate '" << certificateName
                      << "' not found." << std::endl;
        }
    }
    else {
        const auto &certificate = outcome.GetResult().GetServerCertificate();
        std::cout << "Name: " <<
                  certificate.GetServerCertificateMetadata().GetServerCertificateName()
                  << std::endl << "Body: " << certificate.GetCertificateBody() <<
                  std::endl << "Chain: " << certificate.GetCertificateChain() <<
                  std::endl;
    }

    return result;
}

bool AwsDoc::IAM::listAccessKeys(const Aws::String &userName,
                                 const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::ListAccessKeysRequest request;
    request.SetUserName(userName);

    bool done = false;
    bool header = false;
    while (!done) {
        auto outcome = iam.ListAccessKeys(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to list access keys for user " << userName
                      << ": " << outcome.GetError().GetMessage() << std::endl;
            return false;
        }

        if (!header) {
            std::cout << std::left << std::setw(32) << "UserName" <<
                      std::setw(30) << "KeyID" << std::setw(20) << "Status" <<
                      std::setw(20) << "CreateDate" << std::endl;
            header = true;
        }

        const auto &keys = outcome.GetResult().GetAccessKeyMetadata();
        const Aws::String DATE_FORMAT = "%Y-%m-%d";

        for (const auto &key: keys) {
            Aws::String statusString =
                    Aws::IAM::Model::StatusTypeMapper::GetNameForStatusType(
                            key.GetStatus());
            std::cout << std::left << std::setw(32) << key.GetUserName() <<
                      std::setw(30) << key.GetAccessKeyId() << std::setw(20) <<
                      statusString << std::setw(20) <<
                      key.GetCreateDate().ToGmtString(DATE_FORMAT.c_str()) << std::endl;
        }

        if (outcome.GetResult().GetIsTruncated()) {
            request.SetMarker(outcome.GetResult().GetMarker());
        }
        else {
            done = true;
        }
    }

    return true;
}

bool
AwsDoc::IAM::listAccountAliases(const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::ListAccountAliasesRequest request;

    bool done = false;
    bool header = false;
    while (!done) {
        auto outcome = iam.ListAccountAliases(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to list account aliases: " <<
                      outcome.GetError().GetMessage() << std::endl;
            return false;
        }

        const auto &aliases = outcome.GetResult().GetAccountAliases();
        if (!header) {
            if (aliases.size() == 0) {
                std::cout << "Account has no aliases" << std::endl;
                break;
            }
            std::cout << std::left << std::setw(32) << "Alias" << std::endl;
            header = true;
        }

        for (const auto &alias: aliases) {
            std::cout << std::left << std::setw(32) << alias << std::endl;
        }

        if (outcome.GetResult().GetIsTruncated()) {
            request.SetMarker(outcome.GetResult().GetMarker());
        }
        else {
            done = true;
        }
    }

    return true;
}

bool AwsDoc::IAM::listPolicies(const Aws::Client::ClientConfiguration &clientConfig) {
    const Aws::String DATE_FORMAT("%Y-%m-%d");
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::ListPoliciesRequest request;

    bool done = false;
    bool header = false;
    while (!done) {
        auto outcome = iam.ListPolicies(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to list iam policies: " <<
                      outcome.GetError().GetMessage() << std::endl;
            return false;
        }

        if (!header) {
            std::cout << std::left << std::setw(55) << "Name" <<
                      std::setw(30) << "ID" << std::setw(80) << "Arn" <<
                      std::setw(64) << "Description" << std::setw(12) <<
                      "CreateDate" << std::endl;
            header = true;
        }

        const auto &policies = outcome.GetResult().GetPolicies();
        for (const auto &policy: policies) {
            std::cout << std::left << std::setw(55) <<
                      policy.GetPolicyName() << std::setw(30) <<
                      policy.GetPolicyId() << std::setw(80) << policy.GetArn() <<
                      std::setw(64) << policy.GetDescription() << std::setw(12) <<
                      policy.GetCreateDate().ToGmtString(DATE_FORMAT.c_str()) <<
                      std::endl;
        }

        if (outcome.GetResult().GetIsTruncated()) {
            request.SetMarker(outcome.GetResult().GetMarker());
        }
        else {
            done = true;
        }
    }

    return true;
}

bool AwsDoc::IAM::listServerCertificates(
        const Aws::Client::ClientConfiguration &clientConfig) {
    const Aws::String DATE_FORMAT = "%Y-%m-%d";

    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::ListServerCertificatesRequest request;

    bool done = false;
    bool header = false;
    while (!done) {
        auto outcome = iam.ListServerCertificates(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to list server certificates: " <<
                      outcome.GetError().GetMessage() << std::endl;
            return false;
        }

        if (!header) {
            std::cout << std::left << std::setw(55) << "Name" <<
                      std::setw(30) << "ID" << std::setw(80) << "Arn" <<
                      std::setw(14) << "UploadDate" << std::setw(14) <<
                      "ExpirationDate" << std::endl;
            header = true;
        }

        const auto &certificates =
                outcome.GetResult().GetServerCertificateMetadataList();

        for (const auto &certificate: certificates) {
            std::cout << std::left << std::setw(55) <<
                      certificate.GetServerCertificateName() << std::setw(30) <<
                      certificate.GetServerCertificateId() << std::setw(80) <<
                      certificate.GetArn() << std::setw(14) <<
                      certificate.GetUploadDate().ToGmtString(DATE_FORMAT.c_str()) <<
                      std::setw(14) <<
                      certificate.GetExpiration().ToGmtString(DATE_FORMAT.c_str()) <<
                      std::endl;
        }

        if (outcome.GetResult().GetIsTruncated()) {
            request.SetMarker(outcome.GetResult().GetMarker());
        }
        else {
            done = true;
        }
    }

    return true;
}

bool AwsDoc::IAM::listUsers(const Aws::Client::ClientConfiguration &clientConfig) {
    const Aws::String DATE_FORMAT = "%Y-%m-%d";
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::ListUsersRequest request;

    bool done = false;
    bool header = false;
    while (!done) {
        auto outcome = iam.ListUsers(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to list iam users:" <<
                      outcome.GetError().GetMessage() << std::endl;
            return false;
        }

        if (!header) {
            std::cout << std::left << std::setw(32) << "Name" <<
                      std::setw(30) << "ID" << std::setw(64) << "Arn" <<
                      std::setw(20) << "CreateDate" << std::endl;
            header = true;
        }

        const auto &users = outcome.GetResult().GetUsers();
        for (const auto &user: users) {
            std::cout << std::left << std::setw(32) << user.GetUserName() <<
                      std::setw(30) << user.GetUserId() << std::setw(64) <<
                      user.GetArn() << std::setw(20) <<
                      user.GetCreateDate().ToGmtString(DATE_FORMAT.c_str())
                      << std::endl;
        }

        if (outcome.GetResult().GetIsTruncated()) {
            request.SetMarker(outcome.GetResult().GetMarker());
        }
        else {
            done = true;
        }
    }

    return true;
}

bool AwsDoc::IAM::putRolePolicy(
        const Aws::String &roleName,
        const Aws::String &policyName,
        const Aws::String &policyDocument,
        const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iamClient(clientConfig);
    Aws::IAM::Model::PutRolePolicyRequest request;

    request.SetRoleName(roleName);
    request.SetPolicyName(policyName);
    request.SetPolicyDocument(policyDocument);

    Aws::IAM::Model::PutRolePolicyOutcome outcome = iamClient.PutRolePolicy(request);
    if (!outcome.IsSuccess()) {
        std::cerr << "Error putting policy on role. " <<
                  outcome.GetError().GetMessage() << std::endl;
    }
    else {
        std::cout << "Successfully put the role policy." << std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::updateAccessKey(const Aws::String &userName,
                                  const Aws::String &accessKeyID,
                                  Aws::IAM::Model::StatusType status,
                                  const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::UpdateAccessKeyRequest request;
    request.SetUserName(userName);
    request.SetAccessKeyId(accessKeyID);
    request.SetStatus(status);

    auto outcome = iam.UpdateAccessKey(request);
    if (outcome.IsSuccess()) {
        std::cout << "Successfully updated status of access key "
                  << accessKeyID << " for user " << userName << std::endl;
    }
    else {
        std::cerr << "Error updated status of access key " << accessKeyID <<
                  " for user " << userName << ": " <<
                  outcome.GetError().GetMessage() << std::endl;
    }

    return outcome.IsSuccess();
}

bool AwsDoc::IAM::updateServerCertificate(const Aws::String &currentCertificateName,
                                          const Aws::String &newCertificateName,
                                          const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);
    Aws::IAM::Model::UpdateServerCertificateRequest request;
    request.SetServerCertificateName(currentCertificateName);
    request.SetNewServerCertificateName(newCertificateName);

    auto outcome = iam.UpdateServerCertificate(request);
    bool result = true;
    if (outcome.IsSuccess()) {
        std::cout << "Server certificate " << currentCertificateName
                  << " successfully renamed as " << newCertificateName
                  << std::endl;
    }
    else {
        if (outcome.GetError().GetErrorType() != Aws::IAM::IAMErrors::NO_SUCH_ENTITY) {
            std::cerr << "Error changing name of server certificate " <<
                      currentCertificateName << " to " << newCertificateName << ":" <<
                      outcome.GetError().GetMessage() << std::endl;
            result = false;
        }
        else {
            std::cout << "Certificate '" << currentCertificateName
                      << "' not found." << std::endl;
        }
    }

    return result;
}

bool AwsDoc::IAM::updateUser(const Aws::String &currentUserName,
                             const Aws::String &newUserName,
                             const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::IAM::IAMClient iam(clientConfig);

    Aws::IAM::Model::UpdateUserRequest request;
    request.SetUserName(currentUserName);
    request.SetNewUserName(newUserName);

    auto outcome = iam.UpdateUser(request);
    if (outcome.IsSuccess()) {
        std::cout << "IAM user " << currentUserName <<
                  " successfully updated with new user name " << newUserName <<
                  std::endl;
    }
    else {
        std::cerr << "Error updating user name for IAM user " << currentUserName <<
                  ":" << outcome.GetError().GetMessage() << std::endl;
    }

    return outcome.IsSuccess();
}

namespace AwsDoc {
    namespace IAM {
  
        //! Cleanup by deleting created entities.
        /*!
          \sa DeleteCreatedEntities
          \param client: IAM client.
          \param role: IAM role.
          \param user: IAM user.
          \param policy: IAM policy.
        */
        static bool DeleteCreatedEntities(const Aws::IAM::IAMClient &client,
                                          const Aws::IAM::Model::Role &role,
                                          const Aws::IAM::Model::User &user,
                                          const Aws::IAM::Model::Policy &policy);
    }

    static const int LIST_BUCKETS_WAIT_SEC = 20;

    static const char ALLOCATION_TAG[] = "example_code";
}

//! Scenario to create an IAM user, create an IAM role, and apply the role to the user.
// "IAM access" permissions are needed to run this code.
// "STS assume role" permissions are needed to run this code. (Note: It might be necessary to
//    create a custom policy).
/*!
  \sa iamCreateUserAssumeRoleScenario
  \param clientConfig: Aws client configuration.
  \return bool: Successful completion.
*/
bool AwsDoc::IAM::iamCreateUserAssumeRoleScenario(
        const Aws::Client::ClientConfiguration &clientConfig) {

    Aws::IAM::IAMClient client(clientConfig);
    Aws::IAM::Model::User user;
    Aws::IAM::Model::Role role;
    Aws::IAM::Model::Policy policy;

    // 1. Create a user.
    {
        Aws::IAM::Model::CreateUserRequest request;
        Aws::String uuid = Aws::Utils::UUID::RandomUUID();
        Aws::String userName = "iam-demo-user-" +
                               Aws::Utils::StringUtils::ToLower(uuid.c_str());
        request.SetUserName(userName);

        Aws::IAM::Model::CreateUserOutcome outcome = client.CreateUser(request);
        if (!outcome.IsSuccess()) {
            std::cout << "Error creating IAM user " << userName << ":" <<
                      outcome.GetError().GetMessage() << std::endl;
            return false;
        }
        else {
            std::cout << "Successfully created IAM user " << userName << std::endl;
        }

        user = outcome.GetResult().GetUser();
    }

    // 2. Create a role.
    {
        // Get the IAM user for the current client in order to access its ARN.
        Aws::String iamUserArn;
        {
            Aws::IAM::Model::GetUserRequest request;
            Aws::IAM::Model::GetUserOutcome outcome = client.GetUser(request);
            if (!outcome.IsSuccess()) {
                std::cerr << "Error getting Iam user. " <<
                          outcome.GetError().GetMessage() << std::endl;

                DeleteCreatedEntities(client, role, user, policy);
                return false;
            }
            else {
                std::cout << "Successfully retrieved Iam user "
                          << outcome.GetResult().GetUser().GetUserName()
                          << std::endl;
            }

            iamUserArn = outcome.GetResult().GetUser().GetArn();
        }

        Aws::IAM::Model::CreateRoleRequest request;

        Aws::String uuid = Aws::Utils::UUID::RandomUUID();
        Aws::String roleName = "iam-demo-role-" +
                               Aws::Utils::StringUtils::ToLower(uuid.c_str());
        request.SetRoleName(roleName);

        // Build policy document for role.
        Aws::Utils::Document jsonStatement;
        jsonStatement.WithString("Effect", "Allow");

        Aws::Utils::Document jsonPrincipal;
        jsonPrincipal.WithString("AWS", iamUserArn);
        jsonStatement.WithObject("Principal", jsonPrincipal);
        jsonStatement.WithString("Action", "sts:AssumeRole");
        jsonStatement.WithObject("Condition", Aws::Utils::Document());

        Aws::Utils::Document policyDocument;
        policyDocument.WithString("Version", "2012-10-17");

        Aws::Utils::Array<Aws::Utils::Document> statements(1);
        statements[0] = jsonStatement;
        policyDocument.WithArray("Statement", statements);

        std::cout << "Setting policy for role\n   "
                  << policyDocument.View().WriteCompact() << std::endl;

        // Set role policy document as JSON string.
        request.SetAssumeRolePolicyDocument(policyDocument.View().WriteCompact());

        Aws::IAM::Model::CreateRoleOutcome outcome = client.CreateRole(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Error creating role. " <<
                      outcome.GetError().GetMessage() << std::endl;

            DeleteCreatedEntities(client, role, user, policy);
            return false;
        }
        else {
            std::cout << "Successfully created a role with name " << roleName
                      << std::endl;
        }

        role = outcome.GetResult().GetRole();
    }

    // 3. Create an IAM policy.
    {
        Aws::IAM::Model::CreatePolicyRequest request;
        Aws::String uuid = Aws::Utils::UUID::RandomUUID();
        Aws::String policyName = "iam-demo-policy-" +
                                 Aws::Utils::StringUtils::ToLower(uuid.c_str());
        request.SetPolicyName(policyName);

        // Build IAM policy document.
        Aws::Utils::Document jsonStatement;
        jsonStatement.WithString("Effect", "Allow");
        jsonStatement.WithString("Action", "s3:ListAllMyBuckets");
        jsonStatement.WithString("Resource", "arn:aws:s3:::*");

        Aws::Utils::Document policyDocument;
        policyDocument.WithString("Version", "2012-10-17");

        Aws::Utils::Array<Aws::Utils::Document> statements(1);
        statements[0] = jsonStatement;
        policyDocument.WithArray("Statement", statements);

        std::cout << "Creating a policy.\n   " << policyDocument.View().WriteCompact()
                  << std::endl;

        // Set IAM policy document as JSON string.
        request.SetPolicyDocument(policyDocument.View().WriteCompact());

        Aws::IAM::Model::CreatePolicyOutcome outcome = client.CreatePolicy(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Error creating policy. " <<
                      outcome.GetError().GetMessage() << std::endl;

            DeleteCreatedEntities(client, role, user, policy);
            return false;
        }
        else {
            std::cout << "Successfully created a policy with name, " << policyName <<
                      "." << std::endl;
        }

        policy = outcome.GetResult().GetPolicy();
    }

    // 4. Assume the new role using the AWS Security Token Service (STS).
    Aws::STS::Model::Credentials credentials;
    {
        Aws::STS::STSClient stsClient(clientConfig);

        Aws::STS::Model::AssumeRoleRequest request;
        request.SetRoleArn(role.GetArn());
        Aws::String uuid = Aws::Utils::UUID::RandomUUID();
        Aws::String roleSessionName = "iam-demo-role-session-" +
                                      Aws::Utils::StringUtils::ToLower(uuid.c_str());
        request.SetRoleSessionName(roleSessionName);

        Aws::STS::Model::AssumeRoleOutcome assumeRoleOutcome;

        // Repeatedly call AssumeRole, because there is often a delay
        // before the role is available to be assumed.
        // Repeat at most 20 times when access is denied.
        int count = 0;
        while (true) {
            assumeRoleOutcome = stsClient.AssumeRole(request);
            if (!assumeRoleOutcome.IsSuccess()) {
                if (count > 20 ||
                    assumeRoleOutcome.GetError().GetErrorType() !=
                    Aws::STS::STSErrors::ACCESS_DENIED) {
                    std::cerr << "Error assuming role after 20 tries. " <<
                              assumeRoleOutcome.GetError().GetMessage() << std::endl;

                    DeleteCreatedEntities(client, role, user, policy);
                    return false;
                }
                std::this_thread::sleep_for(std::chrono::seconds(1));
            }
            else {
                std::cout << "Successfully assumed the role after " << count
                          << " seconds." << std::endl;
                break;
            }
            count++;
        }

        credentials = assumeRoleOutcome.GetResult().GetCredentials();
    }


    // 5. List objects in the bucket (This should fail).
    {
        Aws::S3::S3Client s3Client(
                Aws::Auth::AWSCredentials(credentials.GetAccessKeyId(),
                                          credentials.GetSecretAccessKey(),
                                          credentials.GetSessionToken()),
                Aws::MakeShared<Aws::S3::S3EndpointProvider>(ALLOCATION_TAG),
                clientConfig);
        Aws::S3::Model::ListBucketsOutcome listBucketsOutcome = s3Client.ListBuckets();
        if (!listBucketsOutcome.IsSuccess()) {
            if (listBucketsOutcome.GetError().GetErrorType() !=
                Aws::S3::S3Errors::ACCESS_DENIED) {
                std::cerr << "Could not lists buckets. " <<
                          listBucketsOutcome.GetError().GetMessage() << std::endl;
            }
            else {
                std::cout
                        << "Access to list buckets denied because privileges have not been applied."
                        << std::endl;
            }
        }
        else {
            std::cerr
                    << "Successfully retrieved bucket lists when this should not happen."
                    << std::endl;
        }
    }

    // 6. Attach the policy to the role.
    {
        Aws::IAM::Model::AttachRolePolicyRequest request;
        request.SetRoleName(role.GetRoleName());
        request.WithPolicyArn(policy.GetArn());

        Aws::IAM::Model::AttachRolePolicyOutcome outcome = client.AttachRolePolicy(
                request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Error creating policy. " <<
                      outcome.GetError().GetMessage() << std::endl;

            DeleteCreatedEntities(client, role, user, policy);
            return false;
        }
        else {
            std::cout << "Successfully attached the policy with name, "
                      << policy.GetPolicyName() <<
                      ", to the role, " << role.GetRoleName() << "." << std::endl;
        }
    }

    int count = 0;
    // 7. List objects in the bucket (this should succeed).
    // Repeatedly call ListBuckets, because there is often a delay
    // before the policy with ListBucket permissions has been applied to the role.
    // Repeat at most LIST_BUCKETS_WAIT_SEC times when access is denied.
    while (true) {
        Aws::S3::S3Client s3Client(
                Aws::Auth::AWSCredentials(credentials.GetAccessKeyId(),
                                          credentials.GetSecretAccessKey(),
                                          credentials.GetSessionToken()),
                Aws::MakeShared<Aws::S3::S3EndpointProvider>(ALLOCATION_TAG),
                clientConfig);
        Aws::S3::Model::ListBucketsOutcome listBucketsOutcome = s3Client.ListBuckets();
        if (!listBucketsOutcome.IsSuccess()) {
            if ((count > LIST_BUCKETS_WAIT_SEC) ||
                listBucketsOutcome.GetError().GetErrorType() !=
                Aws::S3::S3Errors::ACCESS_DENIED) {
                std::cerr << "Could not lists buckets after " << LIST_BUCKETS_WAIT_SEC << " seconds. " <<
                          listBucketsOutcome.GetError().GetMessage() << std::endl;
                DeleteCreatedEntities(client, role, user, policy);
                return false;
            }

            std::this_thread::sleep_for(std::chrono::seconds(1));
        }
        else {

            std::cout << "Successfully retrieved bucket lists after " << count
                      << " seconds." << std::endl;
            break;
        }
        count++;
    }

    // 8. Delete all the created resources.
    return DeleteCreatedEntities(client, role, user, policy);
}

bool AwsDoc::IAM::DeleteCreatedEntities(const Aws::IAM::IAMClient &client,
                                        const Aws::IAM::Model::Role &role,
                                        const Aws::IAM::Model::User &user,
                                        const Aws::IAM::Model::Policy &policy) {
    bool result = true;
    if (policy.ArnHasBeenSet()) {
        // Detach the policy from the role.
        {
            Aws::IAM::Model::DetachRolePolicyRequest request;
            request.SetPolicyArn(policy.GetArn());
            request.SetRoleName(role.GetRoleName());

            Aws::IAM::Model::DetachRolePolicyOutcome outcome = client.DetachRolePolicy(
                    request);
            if (!outcome.IsSuccess()) {
                std::cerr << "Error Detaching policy from roles. " <<
                          outcome.GetError().GetMessage() << std::endl;
                result = false;
            }
            else {
                std::cout << "Successfully detached the policy with arn "
                          << policy.GetArn()
                          << " from role " << role.GetRoleName() << "." << std::endl;
            }
        }

        // Delete the policy.
        {
            Aws::IAM::Model::DeletePolicyRequest request;
            request.WithPolicyArn(policy.GetArn());

            Aws::IAM::Model::DeletePolicyOutcome outcome = client.DeletePolicy(request);
            if (!outcome.IsSuccess()) {
                std::cerr << "Error deleting policy. " <<
                          outcome.GetError().GetMessage() << std::endl;
                result = false;
            }
            else {
                std::cout << "Successfully deleted the policy with arn "
                          << policy.GetArn() << std::endl;
            }
        }

    }

    if (role.RoleIdHasBeenSet()) {
        // Delete the role.
        Aws::IAM::Model::DeleteRoleRequest request;
        request.SetRoleName(role.GetRoleName());

        Aws::IAM::Model::DeleteRoleOutcome outcome = client.DeleteRole(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Error deleting role. " <<
                      outcome.GetError().GetMessage() << std::endl;
            result = false;
        }
        else {
            std::cout << "Successfully deleted the role with name "
                      << role.GetRoleName() << std::endl;
        }
    }

    if (user.ArnHasBeenSet()) {
        // Delete the user.
        Aws::IAM::Model::DeleteUserRequest request;
        request.WithUserName(user.GetUserName());

        Aws::IAM::Model::DeleteUserOutcome outcome = client.DeleteUser(request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Error deleting user. " <<
                      outcome.GetError().GetMessage() << std::endl;
            result = false;
        }
        else {
            std::cout << "Successfully deleted the user with name "
                      << user.GetUserName() << std::endl;
        }
    }

    return result;
}