EXFacebook.m - expo-facebook - iOS

EXFacebook.m

//Source: https://github.com/expo/expo/blob/master/packages/expo-facebook/ios/EXFacebook/EXFacebook.m#L127-L177

UM_EXPORT_METHOD_AS(logInWithReadPermissionsAsync,
                    logInWithReadPermissionsWithConfig:(NSDictionary *)config
                    resolver:(UMPromiseResolveBlock)resolve
                    rejecter:(UMPromiseRejectBlock)reject)
{
  if (![FBSDKSettings appID]) {
    reject(EXFacebookMisconfiguredErrorDomain, @"No appId configured, required for initialization. Please ensure that you're either providing `appId` to `initializeAsync` as an argument or inside Info.plist.", nil);
    return;
  }
  
  NSArray *permissions = config[@"permissions"];
  if (!permissions) {
    permissions = @[@"public_profile", @"email"];
  }
  
  // FB SDK requires login to run on main thread
  // Needs to not race with other mutations of this global FB state
  dispatch_async(dispatch_get_main_queue(), ^{
    FBSDKLoginManager *loginManager = [[FBSDKLoginManager alloc] init];
    [loginManager logOut];
    
    @try {
      [loginManager logInWithPermissions:permissions fromViewController:nil handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
        if (error) {
          reject(EXFacebookLoginErrorDomain, @"Error with Facebook login", error);
          return;
        }
        
        if (result.isCancelled || !result.token) {
          resolve(@{ @"type": @"cancel" });
          return;
        }
        
        NSMutableDictionary *accessToken = [NSMutableDictionary dictionaryWithDictionary:[EXFacebook accessTokenNativeToJSON:result.token]];
        accessToken[@"type"] = @"success";
        resolve(accessToken);
      }];
    }
    @catch (NSException *exception) {
      NSError *error = [[NSError alloc] initWithDomain:EXFacebookLoginErrorDomain code:650 userInfo:@{
        NSLocalizedDescriptionKey: exception.description,
        NSLocalizedFailureReasonErrorKey: exception.reason,
        @"ExceptionUserInfo": exception.userInfo,
        @"ExceptionCallStackSymbols": exception.callStackSymbols,
        @"ExceptionCallStackReturnAddresses": exception.callStackReturnAddresses,
        @"ExceptionName": exception.name
      }];
      reject(error.domain, exception.reason, error);
    }
  });
}