text: /*
   *
   * Copyright 2015, Google Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * 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.
   *     * Neither the name of Google Inc. nor the names of its
   * 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
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  #ifndef GRPCXX_SECURITY_AUTH_METADATA_PROCESSOR_H
  #define GRPCXX_SECURITY_AUTH_METADATA_PROCESSOR_H
  
  #include <map>
  
  #include <grpc++/security/auth_context.h>
  #include <grpc++/support/status.h>
  #include <grpc++/support/string_ref.h>
  
  namespace grpc {
  
  class AuthMetadataProcessor {
   public:
    typedef std::multimap<grpc::string_ref, grpc::string_ref> InputMetadata;
    typedef std::multimap<grpc::string, grpc::string> OutputMetadata;
  
    virtual ~AuthMetadataProcessor() {}
  
    /// If this method returns true, the Process function will be scheduled in
    /// a different thread from the one processing the call.
    virtual bool IsBlocking() const { return true; }
  
    /// context is read/write: it contains the properties of the channel peer and
    /// it is the job of the Process method to augment it with properties derived
    /// from the passed-in auth_metadata.
    /// consumed_auth_metadata needs to be filled with metadata that has been
    /// consumed by the processor and will be removed from the call.
    /// response_metadata is the metadata that will be sent as part of the
    /// response.
    /// If the return value is not Status::OK, the rpc call will be aborted with
    /// the error code and error message sent back to the client.
    virtual Status Process(const InputMetadata& auth_metadata,
                           AuthContext* context,
                           OutputMetadata* consumed_auth_metadata,
                           OutputMetadata* response_metadata) = 0;
  };
  
  }  // namespace grpc
  
  #endif  // GRPCXX_SECURITY_AUTH_METADATA_PROCESSOR_H
  