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 *
 * Copyright 2014, Google Inc.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * 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.
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 * 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
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#ifndef __GRPC_INTERNAL_SECURITY_CREDENTIALS_H__
#define __GRPC_INTERNAL_SECURITY_CREDENTIALS_H__

#include "src/core/transport/stream_op.h"
#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/support/sync.h>

struct grpc_httpcli_response;

/* --- Constants. --- */

typedef enum {
  GRPC_CREDENTIALS_OK = 0,
  GRPC_CREDENTIALS_ERROR
} grpc_credentials_status;

#define GRPC_CREDENTIALS_TYPE_SSL "Ssl"
#define GRPC_CREDENTIALS_TYPE_OAUTH2 "Oauth2"
#define GRPC_CREDENTIALS_TYPE_COMPOSITE "Composite"
#define GRPC_CREDENTIALS_TYPE_FAKE_TRANSPORT_SECURITY "FakeTransportSecurity"

/* --- grpc_credentials. --- */

typedef void (*grpc_credentials_metadata_cb)(void *user_data,
                                             grpc_mdelem **md_elems,
                                             size_t num_md,
                                             grpc_credentials_status status);

typedef struct {
  void (*destroy)(grpc_credentials *c);
  int (*has_request_metadata)(const grpc_credentials *c);
  int (*has_request_metadata_only)(const grpc_credentials *c);
  void (*get_request_metadata)(grpc_credentials *c,
                               grpc_credentials_metadata_cb cb,
                               void *user_data);
} grpc_credentials_vtable;

struct grpc_credentials {
  const grpc_credentials_vtable *vtable;
  const char *type;
  gpr_refcount refcount;
};

grpc_credentials *grpc_credentials_ref(grpc_credentials *creds);
void grpc_credentials_unref(grpc_credentials *creds);
int grpc_credentials_has_request_metadata(grpc_credentials *creds);
int grpc_credentials_has_request_metadata_only(grpc_credentials *creds);
void grpc_credentials_get_request_metadata(grpc_credentials *creds,
                                           grpc_credentials_metadata_cb cb,
                                           void *user_data);
typedef struct {
  unsigned char *pem_private_key;
  size_t pem_private_key_size;
  unsigned char *pem_cert_chain;
  size_t pem_cert_chain_size;
  unsigned char *pem_root_certs;
  size_t pem_root_certs_size;
} grpc_ssl_config;

const grpc_ssl_config *grpc_ssl_credentials_get_config(
    const grpc_credentials *ssl_creds);

/* Exposed for testing only. */
grpc_credentials_status grpc_compute_engine_credentials_parse_server_response(
    const struct grpc_httpcli_response *response, grpc_mdctx *ctx,
    grpc_mdelem **token_elem, gpr_timespec *token_lifetime);

/* Simulates an oauth2 token fetch with the specified value for testing. */
grpc_credentials *grpc_fake_oauth2_credentials_create(
    const char *token_md_value, int is_async);


/* --- grpc_server_credentials. --- */

typedef struct {
  void (*destroy)(grpc_server_credentials *c);
} grpc_server_credentials_vtable;

struct grpc_server_credentials {
  const grpc_server_credentials_vtable *vtable;
  const char *type;
};

/* TODO(jboeuf): Have an ssl_server_config that can contain multiple key/cert
   pairs. */

const grpc_ssl_config *grpc_ssl_server_credentials_get_config(
    const grpc_server_credentials *ssl_creds);


#endif  /* __GRPC_INTERNAL_SECURITY_CREDENTIALS_H__ */