Xbase++

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 Xbase++

LOCAL nSuccess
LOCAL oHttp
LOCAL oCert
LOCAL cIss
LOCAL cScope
LOCAL cOauth_sub
LOCAL nNumSec
LOCAL cAccessToken

nSuccess := 0

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

oHttp := CreateObject("Chilkat.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)
oCert := CreateObject("Chilkat.Cert")
nSuccess := oCert:LoadPfxFile("c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12", "notasecret")
IF (nSuccess != 1)
    ? oCert:LastErrorText
    oHttp:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  The ISS is your service account email address ending in gserviceaccount.com.
cIss := "chilkatsvc@chilkat25.iam.gserviceaccount.com"

//  The scope is always the following string:
cScope := "https://mail.google.com/"

//  The sub is your company email address
cOauth_sub := "bob@yourcompany.com"

//  The access token is valid for this number of seconds.
nNumSec := 3600

cAccessToken := oHttp:G_SvcOauthAccessToken(cIss, cScope, cOauth_sub, nNumSec, oCert)
IF (oHttp:LastMethodSuccess != 1)
    ? oHttp:LastErrorText
    oHttp:destroy()
    oCert:destroy()
    RETURN
ELSE
    ? "access token: " + cAccessToken
ENDIF

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

oHttp:destroy()
oCert:destroy()