(Objective-C) GMail SMTP Send using Previously Obtained OAuth2 Access Token

Demonstrates how to send email using GMail and OAuth2 authentication. This example assumes an OAuth2 access token was previously obtained.

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#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoMailMan.h>
#import <CkoEmail.h>

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

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

// In this example, our access token was previously saved to the following file which contains JSON like this:
// 	{
// 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
// 	 "token_type": "Bearer",
// 	 "expires_in": 3600,
// 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
// 	}
// 
CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/tokens/_gmailSmtp.json"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load GMail access token file.");
    return;
}

NSString *accessToken = [json StringOf: @"access_token"];

CkoMailMan *mailman = [[CkoMailMan alloc] init];

// Set the properties for the GMail SMTP server:
mailman.SmtpHost = @"smtp.gmail.com";
mailman.SmtpPort = [NSNumber numberWithInt:587];
mailman.StartTLS = YES;

// The SMTP username should be the GMail address of the user's account that authorized your app to send email.
mailman.SmtpUsername = @"chilkat.support@gmail.com";
mailman.OAuth2AccessToken = accessToken;

// Create a new email object
CkoEmail *email = [[CkoEmail alloc] init];

email.Subject = @"This is a test";
email.Body = @"This is a test";
email.From = @"Chilkat <chilkat.support@gmail.com>";
[email AddTo: @"Chilkat Admin" emailAddress: @"admin@chilkatsoft.com"];
// To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

// Call SendEmail to connect to the SMTP server and send.
// The connection (i.e. session) to the SMTP server remains
// open so that subsequent SendEmail calls may use the
// same connection.  
success = [mailman SendEmail: email];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

// You may close the connection here.  If the connection is kept open, 
// the next call to mailman.SendEmail will continue using the already-established connection
// (and automatically re-connect if needed).
success = [mailman CloseSmtpConnection];
if (success != YES) {
    NSLog(@"%@",@"Connection to SMTP server not closed cleanly.");
}

NSLog(@"%@",@"Email Sent via GMail with OAuth2 authentication.");