objective-c/auth_sample/MakeRPCViewController.m

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#import "MakeRPCViewController.h"

#import <AuthTestService/AuthSample.pbrpc.h>
#import <Google/SignIn.h>
#import <gRPC/ProtoRPC.h>
#include <gRPC/status.h>

NSString * const kTestScope = @"https://www.googleapis.com/auth/xapi.zoo";

static NSString * const kTestHostAddress = @"grpc-test.sandbox.google.com";

@implementation MakeRPCViewController

- (void)viewWillAppear:(BOOL)animated {

  // Create a service client and a proto request as usual.
  AUTHTestService *client = [[AUTHTestService alloc] initWithHost:kTestHostAddress];

  AUTHRequest *request = [AUTHRequest message];
  request.fillUsername = YES;
  request.fillOauthScope = YES;

  // Create a not-yet-started RPC. We want to set the request headers on this object before starting
  // it.
  __block ProtoRPC *call =
      [client RPCToUnaryCallWithRequest:request handler:^(AUTHResponse *response, NSError *error) {
        if (response) {
          // This test server responds with the email and scope of the access token it receives.
          self.mainLabel.text = [NSString stringWithFormat:@"Used scope: %@ on behalf of user %@",
                                 response.oauthScope, response.username];

        } else if (error.code == GRPC_STATUS_UNAUTHENTICATED) {
          // Authentication error. OAuth2 specifies we'll receive a challenge header.
          NSString *challengeHeader = call.responseMetadata[@"www-authenticate"][0] ?: @"";
          self.mainLabel.text =
              [@"Invalid credentials. Server challenge:\n" stringByAppendingString:challengeHeader];

        } else {
          // Any other error.
          self.mainLabel.text = [NSString stringWithFormat:@"Unexpected RPC error %li: %@",
                                 (long)error.code, error.localizedDescription];
        }
      }];

  // Set the access token to be used.
  NSString *accessToken = GIDSignIn.sharedInstance.currentUser.authentication.accessToken;
  call.requestMetadata = [NSMutableDictionary dictionaryWithDictionary:
      @{@"Authorization": [@"Bearer " stringByAppendingString:accessToken]}];

  // Start the RPC.
  [call start];

  self.mainLabel.text = @"Waiting for RPC to complete...";
}

@end