B4X

Get XOAUTH2 Access Token from Google OAuth 2.0 Authorization Server

See more HTTP Examples

Obtains an OAUTH2 access token from the Google OAuth 2.0 Authorization Server. This is for Server to server applications using Google API's that need an access token. See https://developers.google.com/accounts/docs/OAuth2ServiceAccount B4X

Dim success As Boolean = False

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

Dim http As ChilkatHttp
http.Initialize("http")

'  --------------------------------------------------------------------------------
'  For a step-by-step guide for setting up your Google Workspace service account,
'  see Setup Google Workspace Account for Sending SMTP GMail from a Service Account
'  --------------------------------------------------------------------------------
'  Begin by loading your Google service account key (.p12)
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadPfxFile("c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12", "notasecret")
If success <> True Then
    Log(cert.LastErrorText)
    Return
End If


'  The ISS is your service account email address ending in gserviceaccount.com.
Dim iss As String = "chilkatsvc@chilkat25.iam.gserviceaccount.com"

'  The scope is always the following string:
Dim scope As String = "https://mail.google.com/"

'  The sub is your company email address
Dim oauth_sub As String = "bob@yourcompany.com"

'  The access token is valid for this number of seconds.
Dim numSec As Int = 3600

Dim accessToken As String = http.G_SvcOauthAccessToken(iss, scope, oauth_sub, numSec, cert)
If http.LastMethodSuccess <> True Then
    Log(http.LastErrorText)
    Return
Else
    Log("access token: " & accessToken)
End If


'  The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one.