(Objective-C) Get a Google Drive Access Token using a .p12 Private Key

Demonstrates how to get a Google Drive API access token using a .p12 private key.

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#import <CkoAuthGoogle.h>
#import <CkoPfx.h>
#import <CkoSocket.h>

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

CkoAuthGoogle *gAuth = [[CkoAuthGoogle alloc] init];

CkoPfx *pfx = [[CkoPfx alloc] init];
BOOL success = [pfx LoadPfxFile: @"qa_data/googleApi/ChilkatTest-5ba79ce39459.p12" password: @"notasecret"];
if (success != YES) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

success = [gAuth SetP12: pfx];
if (success != YES) {
    NSLog(@"%@",gAuth.LastErrorText);
    return;
}

// Choose a scope.
gAuth.Scope = @"https://www.googleapis.com/auth/drive";

// Request an access token that is valid for this many seconds.
gAuth.ExpireNumSeconds = [NSNumber numberWithInt:3600];

// If the application is requesting delegated access:
// The email address of the user for which the application is requesting delegated access,
// then set the email address here. (Otherwise leave it empty.)
gAuth.SubEmailAddress = @"support@chilkatcloud.com";

gAuth.EmailAddress = @"597922945226-00rb0ppfg0snd9jo6bhvd4v17jtj2d3a@developer.gserviceaccount.com";

// Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
// The Chilkat socket object is used so that the connection can be established
// through proxies or an SSH tunnel if desired.
CkoSocket *tlsSock = [[CkoSocket alloc] init];
success = [tlsSock Connect: @"www.googleapis.com" port: [NSNumber numberWithInt: 443] ssl: YES maxWaitMs: [NSNumber numberWithInt: 5000]];
if (success != YES) {
    NSLog(@"%@",tlsSock.LastErrorText);
    return;
}

// Send the request to obtain the access token.
success = [gAuth ObtainAccessToken: tlsSock];
if (success != YES) {
    NSLog(@"%@",gAuth.LastErrorText);
    return;
}

// Examine the access token:
NSLog(@"%@%@",@"Access Token: ",gAuth.AccessToken);