src/objective-c/GRPCClient/GRPCCall+OAuth2.m

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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