(Objective-C) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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#import <CkoJsonObject.h>
#import <CkoRest.h>
#import <NSString.h>

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

// This example also assumes that OAuth2 access and refresh tokens were previously fetched.
// and saved in a JSON file.  

// First get our previously obtained refresh token.
// { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/geoop.json"];

CkoRest *rest = [[CkoRest alloc] init];

// Connect to GeoOp...
BOOL bAutoReconnect = YES;
success = [rest Connect: @"login.geoop.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Set the X-Version header.
[rest AddHeader: @"X-Version" value: @"1.0"];

// Provide the required form params to get the new access token
NSLog(@"%@%@",@"refresh_token = ",[jsonToken StringOf: @"refresh_token"]);
[rest AddQueryParam: @"refresh_token" value: [jsonToken StringOf: @"refresh_token"]];
[rest AddQueryParam: @"grant_type" value: @"refresh_token"];
[rest AddQueryParam: @"client_id" value: @"GEOOP-CLIENT-ID"];
[rest AddQueryParam: @"client_secret" value: @"GEOOP-CLIENT-SECRET"];

NSString *responseBody = [rest FullRequestFormUrlEncoded: @"POST" uriPath: @"/oauth2/token"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// If the response status code did not indicate success, then see what happened..
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@",@"Request Header: ");
    NSLog(@"%@",rest.LastRequestHeader);
    NSLog(@"%@",@"----");
    NSLog(@"%@%d",@"Response StatusCode = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"Response StatusLine: ",rest.ResponseStatusText);
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",rest.ResponseHeader);
    NSLog(@"%@",responseBody);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;
[json Load: responseBody];

// Show the full JSON response.  It should contain the new access token...
NSLog(@"%@",[json Emit]);