/*
 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */


#include <string>

#include <grpc/grpc_security.h>

#include <grpc++/credentials.h>

namespace grpc {

Credentials::Credentials(grpc_credentials* c_creds) : creds_(c_creds) {}

Credentials::~Credentials() { grpc_credentials_release(creds_); }
grpc_credentials* Credentials::GetRawCreds() { return creds_; }

std::unique_ptr<Credentials> CredentialsFactory::DefaultCredentials() {
  grpc_credentials* c_creds = grpc_default_credentials_create();
  std::unique_ptr<Credentials> cpp_creds(new Credentials(c_creds));
  return cpp_creds;
}

// Builds SSL Credentials given SSL specific options
std::unique_ptr<Credentials> CredentialsFactory::SslCredentials(
    const SslCredentialsOptions& options) {
  grpc_credentials* c_creds = grpc_ssl_credentials_create(
      reinterpret_cast<const unsigned char*>(options.pem_root_certs.c_str()),
      options.pem_root_certs.size(),
      reinterpret_cast<const unsigned char*>(options.pem_private_key.c_str()),
      options.pem_private_key.size(),
      reinterpret_cast<const unsigned char*>(options.pem_cert_chain.c_str()),
      options.pem_cert_chain.size());
  std::unique_ptr<Credentials> cpp_creds(new Credentials(c_creds));
  return cpp_creds;
}

// Builds credentials for use when running in GCE
std::unique_ptr<Credentials> CredentialsFactory::ComputeEngineCredentials() {
  grpc_credentials* c_creds = grpc_compute_engine_credentials_create();
  std::unique_ptr<Credentials> cpp_creds(new Credentials(c_creds));
  return cpp_creds;
}


// Combines two credentials objects into a composite credentials.
std::unique_ptr<Credentials> CredentialsFactory::ComposeCredentials(
    const std::unique_ptr<Credentials>& creds1,
    const std::unique_ptr<Credentials>& creds2) {
  // Note that we are not saving unique_ptrs to the two credentials
  // passed in here. This is OK because the underlying C objects (i.e.,
  // creds1 and creds2) into grpc_composite_credentials_create will see their
  // refcounts incremented.
  grpc_credentials* c_creds = grpc_composite_credentials_create(
      creds1->GetRawCreds(), creds2->GetRawCreds());
  std::unique_ptr<Credentials> cpp_creds(new Credentials(c_creds));
  return cpp_creds;
}

}  // namespace grpc