Swift

GMail SMTP Send using Previously Obtained OAuth2 Access Token

See more GMail SMTP/IMAP/POP Examples

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

func chilkatTest() {
    var success: Bool = false

    // 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"
    // 	}
    // 
    let json = CkoJsonObject()!
    success = json.loadFile(path: "qa_data/tokens/_gmailSmtp.json")
    if success != true {
        print("Failed to load GMail access token file.")
        return
    }

    var accessToken: String? = json.string(of: "access_token")

    let mailman = CkoMailMan()!

    // Set the properties for the GMail SMTP server:
    mailman.smtpHost = "smtp.gmail.com"
    mailman.smtpPort = 587
    mailman.startTLS = true

    // 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
    let email = CkoEmail()!

    email.subject = "This is a test"
    email.body = "This is a test"
    email.from = "Chilkat <chilkat.support@gmail.com>"
    email.add(to: "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: email)
    if success != true {
        print("\(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 != true {
        print("Connection to SMTP server not closed cleanly.")
    }

    print("Email Sent via GMail with OAuth2 authentication.")

}