/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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
 *
 *     http://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.
 */

#pragma once

#include <folly/io/async/AsyncTransportCertificate.h>
#include <folly/portability/OpenSSL.h>
#include <folly/ssl/OpenSSLPtrTypes.h>

namespace folly {

/**
 * Generic interface applications may implement to convey self or peer
 * certificate related information.
 */
class OpenSSLTransportCertificate : public AsyncTransportCertificate {
 public:
  virtual ~OpenSSLTransportCertificate() = default;

  // TODO: Once all callsites using getX509() perform dynamic casts to this
  // OpenSSLTransportCertificate type, we can move that method to be declared
  // here instead.
};
} // namespace folly

/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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
 *
 *     http://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.
 */

#pragma once

#include <folly/io/async/AsyncTransportCertificate.h>
#include <folly/portability/OpenSSL.h>
#include <folly/ssl/OpenSSLPtrTypes.h>

namespace folly {

/**
 * Generic interface applications may implement to convey self or peer
 * certificate related information.
 */
class OpenSSLTransportCertificate : public AsyncTransportCertificate {
 public:
  virtual ~OpenSSLTransportCertificate() = default;

  // TODO: Once all callsites using getX509() perform dynamic casts to this
  // OpenSSLTransportCertificate type, we can move that method to be declared
  // here instead.

  static ssl::X509UniquePtr tryExtractX509(
      const AsyncTransportCertificate* cert) {
    auto opensslCert = dynamic_cast<const OpenSSLTransportCertificate*>(cert);
    return opensslCert ? opensslCert->getX509() : nullptr;
  }
};
} // namespace folly

Add static helper to extract X509 from cert
Add static helper to extract X509 from cert

Summary:
Since callsites wanting an X509 from an AsyncTransportCertificate will have to
perform a dynamic cast to an OpenSSLTransportCertificiate, we might as well
abstract that away into a static helper.

This makes it potentially a bit easier to change implementation details in the
future without having to update a bunch of existing callsites (and it hides the
ugliness of the dynamic cast).

Reviewed By: yfeldblum, mingtaoy

Differential Revision: D31358948

fbshipit-source-id: 9ed2f81db4cf746a83871961895a0c1f1fb5c297
