/*
 *
 * 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,
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 */

#import "GRPCCall+OAuth2.h"

static NSString * const kAuthorizationHeader = @"authorization";
static NSString * const kBearerPrefix = @"Bearer ";
static NSString * const kChallengeHeader = @"www-authenticate";

@implementation GRPCCall (OAuth2)

- (NSString *)oauth2AccessToken {
  NSString *headerValue = self.requestHeaders[kAuthorizationHeader];
  if ([headerValue hasPrefix:kBearerPrefix]) {
    return [headerValue substringFromIndex:kBearerPrefix.length];
  } else {
    return nil;
  }
}

- (void)setOauth2AccessToken:(NSString *)token {
  if (token) {
    self.requestHeaders[kAuthorizationHeader] = [kBearerPrefix stringByAppendingString:token];
  } else {
    [self.requestHeaders removeObjectForKey:kAuthorizationHeader];
  }
}

- (NSString *)oauth2ChallengeHeader {
  return self.responseHeaders[kChallengeHeader];
}

@end