(Objective-C) X.com OAuth 2.0 Refresh Access Token

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Note: This example requires Chilkat v10.1.2 or greater.

For more information, see https://docs.x.com/resources/fundamentals/authentication/oauth-2-0/authorization-code

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

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

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

// The access token JSON looks something like this:

// {
//   "token_type": "bearer",
//   "expires_in": 7200,
//   "access_token": "VmNDLVZiYUZwejY5Mkx3RblFTmo3ek1leTRGclMuZFVOUTVUTWpNbVZKb1N5OjE3NDAxNjk4MDVxNTE6MToxOaF0OjE",
//   "scope": "block.read follows.read offline.access tweet.write block.write like.write like.read users.read tweet.read follows.write",
//   "refresh_token": "eThOWVVFSTRqdVp3QTFndGsxM2ZGZmFyNWVrU0phM1JKbGdrbGNWRGJzb1loOjE3NDAwMjk4MDUxNTI6MTowOnJ0OjE"
// }

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

oauth2.TokenEndpoint = @"https://api.x.com/2/oauth2/token";

// Replace this with your actual X.com OAuth2 Client ID and Client Secret
oauth2.ClientId = @"OAUTH2_CLIENT_ID";
oauth2.ClientSecret = @"OAUTH2_CLIENT_SECRET";

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

// Send the HTTP POST to refresh the access token..
success = [oauth2 RefreshAccessToken];
if (success != YES) {
    NSLog(@"%@",oauth2.LastErrorText);
    return;
}

// Load the access token response into the json object 
[jsonToken Load: oauth2.AccessTokenResponse];

// If an "expires_on" member does not exist, then add the JSON member by
// getting the current system date/time and adding the "expires_in" seconds.
// This way we'll know when the token expires.
if ([jsonToken HasMember: @"expires_on"] == NO) {
    CkoDateTime *dtExpire = [[CkoDateTime alloc] init];
    [dtExpire SetFromCurrentSystemTime];
    [dtExpire AddSeconds: [jsonToken IntOf: @"expires_in"]];
    [jsonToken AppendString: @"expires_on" value: [dtExpire GetAsUnixTimeStr: NO]];
}

// 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/x.json" charset: @"utf-8" emitBom: NO];

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