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diff --git a/include/grpc++/security/auth_metadata_processor.h b/include/grpc++/security/auth_metadata_processor.h
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+/*
+ *
+ * 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_AUTH_METADATA_PROCESSOR_H_
+#define GRPCXX_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_ref> 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_AUTH_METADATA_PROCESSOR_H_
+