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iam_samples.cc
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "google/cloud/iam/iam_policy_client.h"
#include "google/cloud/pubsub/samples/pubsub_samples_common.h"
#include "google/cloud/pubsub/subscription_admin_client.h"
#include "google/cloud/pubsub/subscription_builder.h"
#include "google/cloud/pubsub/topic_admin_client.h"
#include "google/cloud/internal/getenv.h"
#include "google/cloud/internal/random.h"
#include "google/cloud/testing_util/example_driver.h"
#include <sstream>
#include <utility>
namespace {
void GetTopicPolicy(std::vector<std::string> const& argv) {
// [START pubsub_get_topic_policy]
namespace iam = google::cloud::iam;
namespace pubsub = google::cloud::pubsub;
[](std::string project_id, std::string topic_id) {
auto const topic =
pubsub::Topic(std::move(project_id), std::move(topic_id));
auto client = iam::IAMPolicyClient(
iam::MakeIAMPolicyConnection(pubsub::IAMPolicyOptions()));
google::iam::v1::GetIamPolicyRequest request;
request.set_resource(topic.FullName());
auto response = client.GetIamPolicy(request);
if (!response) throw std::move(response).status();
std::cout << "Policy for topic " << topic.FullName() << ": "
<< response->DebugString() << "\n";
}
// [END pubsub_get_topic_policy]
(argv.at(0), argv.at(1));
}
void SetTopicPolicy(std::vector<std::string> const& argv) {
// [START pubsub_set_topic_policy]
namespace iam = google::cloud::iam;
namespace pubsub = google::cloud::pubsub;
using google::cloud::StatusCode;
[](std::string project_id, std::string topic_id) {
auto const topic =
pubsub::Topic(std::move(project_id), std::move(topic_id));
auto client = iam::IAMPolicyClient(
iam::MakeIAMPolicyConnection(pubsub::IAMPolicyOptions()));
// In production code, consider an OCC loop to handle concurrent changes
// to the policy.
google::iam::v1::GetIamPolicyRequest get;
get.set_resource(topic.FullName());
auto policy = client.GetIamPolicy(get);
if (!policy) throw std::move(policy).status();
google::iam::v1::SetIamPolicyRequest set;
set.set_resource(topic.FullName());
*set.mutable_policy() = *std::move(policy);
// Add all users as viewers.
auto& b0 = *set.mutable_policy()->add_bindings();
b0.set_role("roles/pubsub.viewer");
b0.add_members("domain:google.com");
// Add a group as an editor.
auto& b1 = *set.mutable_policy()->add_bindings();
b1.set_role("roles/pubsub.publisher");
b1.add_members("group:cloud-logs@google.com");
auto response = client.SetIamPolicy(set);
if (!response) throw std::move(response).status();
std::cout << "Policy for topic " << topic.FullName() << ": "
<< response->DebugString() << "\n";
}
// [END pubsub_set_topic_policy]
(argv.at(0), argv.at(1));
}
void TestTopicPermissions(std::vector<std::string> const& argv) {
// [START pubsub_test_topic_permissions]
namespace iam = google::cloud::iam;
namespace pubsub = google::cloud::pubsub;
[](std::string project_id, std::string topic_id) {
auto const topic =
pubsub::Topic(std::move(project_id), std::move(topic_id));
auto client = iam::IAMPolicyClient(
iam::MakeIAMPolicyConnection(pubsub::IAMPolicyOptions()));
google::iam::v1::TestIamPermissionsRequest request;
request.set_resource(topic.FullName());
request.add_permissions("pubsub.topics.publish");
request.add_permissions("pubsub.topics.update");
auto response = client.TestIamPermissions(request);
if (!response) throw std::move(response).status();
std::cout << "Allowed permissions for topic " << topic.FullName() << ":";
for (auto const& permission : response->permissions()) {
std::cout << " " << permission;
}
std::cout << "\n";
}
// [END pubsub_test_topic_permissions]
(argv.at(0), argv.at(1));
}
void GetSubscriptionPolicy(std::vector<std::string> const& argv) {
// [START pubsub_get_subscription_policy]
namespace iam = google::cloud::iam;
namespace pubsub = google::cloud::pubsub;
[](std::string project_id, std::string subscription_id) {
auto const subscription =
pubsub::Subscription(std::move(project_id), std::move(subscription_id));
auto client = iam::IAMPolicyClient(
iam::MakeIAMPolicyConnection(pubsub::IAMPolicyOptions()));
google::iam::v1::GetIamPolicyRequest request;
request.set_resource(subscription.FullName());
auto response = client.GetIamPolicy(request);
if (!response) throw std::move(response).status();
std::cout << "Policy for subscription " << subscription.FullName() << ": "
<< response->DebugString() << "\n";
}
// [END pubsub_get_subscription_policy]
(argv.at(0), argv.at(1));
}
void SetSubscriptionPolicy(std::vector<std::string> const& argv) {
// [START pubsub_set_subscription_policy]
namespace iam = google::cloud::iam;
namespace pubsub = google::cloud::pubsub;
using google::cloud::StatusCode;
[](std::string project_id, std::string subscription_id) {
auto const subscription =
pubsub::Subscription(std::move(project_id), std::move(subscription_id));
auto client = iam::IAMPolicyClient(
iam::MakeIAMPolicyConnection(pubsub::IAMPolicyOptions()));
// In production code, consider an OCC loop to handle concurrent changes
// to the policy.
google::iam::v1::GetIamPolicyRequest get;
get.set_resource(subscription.FullName());
auto policy = client.GetIamPolicy(get);
if (!policy) throw std::move(policy).status();
google::iam::v1::SetIamPolicyRequest set;
set.set_resource(subscription.FullName());
*set.mutable_policy() = *std::move(policy);
// Add all users as viewers.
auto& b0 = *set.mutable_policy()->add_bindings();
b0.set_role("roles/pubsub.viewer");
b0.add_members("domain:google.com");
// Add a group as an editor.
auto& b1 = *set.mutable_policy()->add_bindings();
b1.set_role("roles/editor");
b1.add_members("group:cloud-logs@google.com");
auto response = client.SetIamPolicy(set);
if (!response) throw std::move(response).status();
std::cout << "Policy for subscription " << subscription.FullName() << ": "
<< response->DebugString() << "\n";
}
// [END pubsub_set_subscription_policy]
(argv.at(0), argv.at(1));
}
void TestSubscriptionPermissions(std::vector<std::string> const& argv) {
// [START pubsub_test_subscription_permissions]
namespace iam = google::cloud::iam;
namespace pubsub = google::cloud::pubsub;
[](std::string project_id, std::string subscription_id) {
auto const subscription =
pubsub::Subscription(std::move(project_id), std::move(subscription_id));
auto client = iam::IAMPolicyClient(
iam::MakeIAMPolicyConnection(pubsub::IAMPolicyOptions()));
google::iam::v1::TestIamPermissionsRequest request;
request.set_resource(subscription.FullName());
request.add_permissions("pubsub.subscriptions.consume");
request.add_permissions("pubsub.subscriptions.update");
auto response = client.TestIamPermissions(request);
if (!response) throw std::move(response).status();
std::cout << "Allowed permissions for subscription "
<< subscription.FullName() << ":";
for (auto const& permission : response->permissions()) {
std::cout << " " << permission;
}
std::cout << "\n";
}
// [END pubsub_test_subscription_permissions]
(argv.at(0), argv.at(1));
}
void AutoRun(std::vector<std::string> const& argv) {
namespace examples = ::google::cloud::testing_util;
namespace pubsub = ::google::cloud::pubsub;
using ::google::cloud::pubsub::examples::RandomSubscriptionId;
using ::google::cloud::pubsub::examples::RandomTopicId;
if (!argv.empty()) throw examples::Usage{"auto"};
// IAM operations do not work in the emulator.
if (google::cloud::pubsub::examples::UsingEmulator()) return;
examples::CheckEnvironmentVariablesAreSet({
"GOOGLE_CLOUD_PROJECT",
});
auto project_id =
google::cloud::internal::GetEnv("GOOGLE_CLOUD_PROJECT").value();
auto generator = google::cloud::internal::MakeDefaultPRNG();
auto const topic_id = RandomTopicId(generator);
auto const subscription_id = RandomSubscriptionId(generator);
auto topic_admin_client =
pubsub::TopicAdminClient(pubsub::MakeTopicAdminConnection());
auto subscription_admin_client = pubsub::SubscriptionAdminClient(
pubsub::MakeSubscriptionAdminConnection());
std::cout << "\nCreate topic (" << topic_id << ")" << std::endl;
auto topic = topic_admin_client
.CreateTopic(pubsub::TopicBuilder(
pubsub::Topic(project_id, topic_id)))
.value();
std::cout << "\nCreate subscription (" << subscription_id << ")" << std::endl;
auto subscription =
subscription_admin_client
.CreateSubscription(pubsub::Topic(project_id, topic_id),
pubsub::Subscription(project_id, subscription_id))
.value();
std::cout << "\nRunning GetTopicPolicy() sample" << std::endl;
GetTopicPolicy({project_id, topic_id});
std::cout << "\nRunning SetTopicPolicy() sample" << std::endl;
try {
SetTopicPolicy({project_id, topic_id});
} catch (google::cloud::Status const&) { // NOLINT(bugprone-empty-catch)
// Ignore errors in this test because SetIamPolicy is flaky without an OCC
// loop, and we do not want to complicate the example with an OCC loop.
}
std::cout << "\nRunning TestTopicPermissions() sample" << std::endl;
TestTopicPermissions({project_id, topic_id});
std::cout << "\nRunning GetSubscriptionPolicy() sample" << std::endl;
GetSubscriptionPolicy({project_id, subscription_id});
std::cout << "\nRunning SetSubscriptionPolicy() sample" << std::endl;
try {
SetSubscriptionPolicy({project_id, subscription_id});
} catch (google::cloud::Status const&) { // NOLINT(bugprone-empty-catch)
// Ignore errors in this test because SetIamPolicy is flaky without an OCC
// loop, and we do not want to complicate the example with an OCC loop.
}
std::cout << "\nRunning TestSubscriptionPermissions() sample" << std::endl;
TestSubscriptionPermissions({project_id, subscription_id});
std::cout << "\nCleanup subscription" << std::endl;
(void)subscription_admin_client.DeleteSubscription(
pubsub::Subscription(project_id, subscription_id));
std::cout << "\nCleanup topic" << std::endl;
(void)topic_admin_client.DeleteTopic(pubsub::Topic(project_id, topic_id));
std::cout << "\nAutoRun done" << std::endl;
}
using IamCommand = std::function<void(std::vector<std::string> const&)>;
google::cloud::testing_util::Commands::value_type CreateIamCommand(
std::string const& name, std::vector<std::string> const& arg_names,
IamCommand const& command) {
auto adapter = [=](std::vector<std::string> const& argv) {
auto constexpr kFixedArguments = 1;
if ((argv.size() == 2 && argv[0] == "--help") ||
argv.size() != arg_names.size() + kFixedArguments) {
std::ostringstream os;
os << name << " <project-id>";
for (auto const& a : arg_names) {
os << " <" << a << ">";
}
throw google::cloud::testing_util::Usage{std::move(os).str()};
}
command(argv);
};
return google::cloud::testing_util::Commands::value_type{name,
std::move(adapter)};
}
} // namespace
int main(int argc, char* argv[]) { // NOLINT(bugprone-exception-escape)
using ::google::cloud::testing_util::Example;
Example example({
CreateIamCommand("get-topic-policy", {"topic-id"}, GetTopicPolicy),
CreateIamCommand("set-topic-policy", {"topic-id"}, SetTopicPolicy),
CreateIamCommand("test-topic-permissions", {"topic-id"},
TestTopicPermissions),
CreateIamCommand("get-subscription-policy", {"subscription-id"},
GetSubscriptionPolicy),
CreateIamCommand("set-subscription-policy", {"subscription-id"},
SetSubscriptionPolicy),
CreateIamCommand("test-subscription-permissions", {"subscription-id"},
TestSubscriptionPermissions),
{"auto", AutoRun},
});
return example.Run(argc, argv);
}