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Policy Simulator API C++ Client Library

This directory contains an idiomatic C++ client library for the Policy Simulator API.

Policy Simulator is a collection of endpoints for creating, running, and viewing a Replay. A Replay is a type of simulation that lets you see how your members' access to resources might change if you changed your IAM policy.

During a Replay, Policy Simulator re-evaluates, or replays, past access attempts under both the current policy and your proposed policy, and compares those results to determine how your members' access might change under the proposed policy.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

Quickstart

The quickstart/ directory contains a minimal environment to get started using this client library in a larger project. The following "Hello World" program is used in this quickstart, and should give you a taste of this library.

#include "google/cloud/policysimulator/v1/simulator_client.h"
#include "google/cloud/location.h"
#include <iostream>
#include <string>

int main(int argc, char* argv[]) try {
  if (argc != 3) {
    std::cerr
        << "Usage: " << argv[0] << " project-id resource-name\n"
        << "See https://cloud.google.com/iam/docs/full-resource-names for "
           "examples of fully qualified resource names.\n";
    return 1;
  }

  auto const location = google::cloud::Location(argv[1], "global");
  auto const resource_name = std::string{argv[2]};

  namespace policysimulator = ::google::cloud::policysimulator_v1;
  auto client = policysimulator::SimulatorClient(
      policysimulator::MakeSimulatorConnection());

  google::cloud::policysimulator::v1::Replay r;
  auto& overlay = *r.mutable_config()->mutable_policy_overlay();
  overlay[resource_name] = [] {
    google::iam::v1::Policy p;
    auto& binding = *p.add_bindings();
    binding.set_role("storage.buckets.get");
    binding.add_members("[email protected]");
    return p;
  }();

  auto replay = client.CreateReplay(location.FullName(), r).get();
  if (!replay) throw std::move(replay).status();
  std::cout << replay->DebugString() << "\n";

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

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