(AutoIt) OAuth2 for a GMail using a JSON Service Account Key

Demonstrates how get an OAuth2 access token for GMail (Google Service Account) using a JSON private key.

After the access token is obtained, it may be used to send email. When the access token expires, a new access token needs to be obtained (using this same procedure).

Note: This is for OAuth2 using Google Service account keys.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

; First load the JSON key into a string.
$oFac = ObjCreate("Chilkat.FileAccess")
Local $sJsonKey = $oFac.ReadEntireTextFile("qa_data/googleApi/ChilkatTest-ab2ecd52ef98.json","utf-8")
If ($oFac.LastMethodSuccess <> True) Then
    ConsoleWrite($oFac.LastErrorText & @CRLF)
    Exit
EndIf

; A JSON private key should look like this:

; 	{
; 	  "type": "service_account",
; 	  "project_id": "chilkattest-1350",
; 	  "private_key_id": "fa2e36ee26986eab628b59868af8bec1d1c64c38",
; 	  "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvgIjFa...28N64N2n1E4FYzBZjSdy\n-----END PRIVATE KEY-----\n",
; 	  "client_email": "598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a@developer.gserviceaccount.com",
; 	  "client_id": "598922945226-00rb0ppfg0snd9jo7bhvd4v17jtj2d3a.apps.googleusercontent.com",
; 	  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
; 	  "token_uri": "https://accounts.google.com/o/oauth2/token",
; 	  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
; 	  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a%40developer.gserviceaccount.com"
; 	}

$oGAuth = ObjCreate("Chilkat.AuthGoogle")
$oGAuth.JsonKey = $sJsonKey

; Choose a scope.
$oGAuth.Scope = "https://mail.google.com/"

; Request an access token that is valid for this many seconds.
$oGAuth.ExpireNumSeconds = 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.)
$oGAuth.SubEmailAddress = ""

; 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.
$oTlsSock = ObjCreate("Chilkat.Socket")
Local $bSuccess = $oTlsSock.Connect("www.googleapis.com",443,True,5000)
If ($bSuccess <> True) Then
    ConsoleWrite($oTlsSock.LastErrorText & @CRLF)
    Exit
EndIf

; Send the request to obtain the access token.
$bSuccess = $oGAuth.ObtainAccessToken($oTlsSock)
If ($bSuccess <> True) Then
    ConsoleWrite($oGAuth.LastErrorText & @CRLF)
    Exit
EndIf

; Examine the access token:
ConsoleWrite("Access Token: " & $oGAuth.AccessToken & @CRLF)

; Now that we have the access token, it may be used to send email
; while it remains valid.  Once the access token expires, a new access token 
; should be obtained using the same code as above.

; -----------------------------------------------------------------------
$oMailman = ObjCreate("Chilkat.MailMan")

; Set the properties for the GMail SMTP server:
$oMailman.SmtpHost = "smtp.gmail.com"
$oMailman.SmtpPort = 587
$oMailman.StartTLS = True

$oMailman.SmtpUsername = "YOUR_GOOGLE_APPS_USER_EMAIL_ADDRESS"
$oMailman.OAuth2AccessToken = $oGAuth.AccessToken

; Create a new email object
$oEmail = ObjCreate("Chilkat.Email")

$oEmail.Subject = "This is a test"
$oEmail.Body = "This is a test"
$oEmail.From = "YOUR NAME <YOUR_GOOGLE_APPS_USER_EMAIL_ADDRESS>"
$bSuccess = $oEmail.AddTo("Chilkat Admin","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.  
$bSuccess = $oMailman.SendEmail($oEmail)
If ($bSuccess <> True) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
    Exit
EndIf

; 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).
$bSuccess = $oMailman.CloseSmtpConnection()
If ($bSuccess <> True) Then
    ConsoleWrite("Connection to SMTP server not closed cleanly." & @CRLF)
EndIf

ConsoleWrite("Email Sent via GMail using an OAuth2 Service Account Key." & @CRLF)