PureBasic

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 PureBasic

IncludeFile "CkCert.pb"
IncludeFile "CkHttp.pb"

Procedure ChilkatExample()

    success.i = 0

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

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; --------------------------------------------------------------------------------
    ; 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)
    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkCert::ckLoadPfxFile(cert,"c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12","notasecret")
    If success <> 1
        Debug CkCert::ckLastErrorText(cert)
        CkHttp::ckDispose(http)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    ; The ISS is your service account email address ending in gserviceaccount.com.
    iss.s = "chilkatsvc@chilkat25.iam.gserviceaccount.com"

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

    ; The sub is your company email address
    oauth_sub.s = "bob@yourcompany.com"

    ; The access token is valid for this number of seconds.
    numSec.i = 3600

    accessToken.s = CkHttp::ckG_SvcOauthAccessToken(http,iss,scope,oauth_sub,numSec,cert)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkCert::ckDispose(cert)
        ProcedureReturn
    Else
        Debug "access token: " + accessToken
    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.


    CkHttp::ckDispose(http)
    CkCert::ckDispose(cert)


    ProcedureReturn
EndProcedure