(Objective-C) Refresh Schwab OAuth2 Access Token

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#import <CkoJsonObject.h>
#import <CkoOAuth2.h>
#import <CkoStringBuilder.h>

BOOL success = NO;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// See Get Schwab OAuth2 Access Token 
// for sample code showing how to obtain a Schwab access token for desktop apps.

// This example assumes we previously obtained an OAuth2 access token for Schwab.

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
success = [jsonToken LoadFile: @"qa_data/tokens/schwab-access-token.json"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load schwab-access-token.json");
    return;
}

// The access token JSON looks something like this:

// {
//   "expires_in": 3600,
//   "x_refresh_token_expires_in": 8726400,
//   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
//   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
//   "token_type": "bearer"
// }

CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init];

oauth2.TokenEndpoint = @"https://api.schwabapi.com/v1/oauth/token";

// Replace these with actual values.
oauth2.ClientId = @"APP_KEY";
oauth2.ClientSecret = @"APP_SECRET";
oauth2.UseBasicAuth = YES;

// Get the "refresh_token"
oauth2.RefreshToken = [jsonToken StringOf: @"refresh_token"];

// Send the HTTP POST to refresh the access token..
success = [oauth2 RefreshAccessToken];
if (success == NO) {
    NSLog(@"%@",oauth2.LastErrorText);
    return;
}

// The response contains a new access token, but we must keep
// our existing refresh token for when we need to refresh again in the future.
[jsonToken UpdateString: @"access_token" value: oauth2.AccessToken];

// Save the new JSON access token response to a file.
// The access + refresh tokens contained in this JSON will be needed for the next refresh.
CkoStringBuilder *sbJson = [[CkoStringBuilder alloc] init];
jsonToken.EmitCompact = NO;

[jsonToken EmitSb: sbJson];
[sbJson WriteFile: @"qa_data/tokens/schwab-access-token.json" charset: @"utf-8" emitBom: NO];

NSLog(@"%@",@"OAuth2 token refreshed!");
NSLog(@"%@%@",@"New Access Token = ",oauth2.AccessToken);