Visual FoxPro

Google Drive Refresh Access Token

See more Google Drive Examples

Demonstrates how to automatically refresh the access token when it expires. Visual FoxPro

LOCAL lnSuccess
LOCAL loJson
LOCAL lcTokenFilePath
LOCAL loOauth2
LOCAL loFac

lnSuccess = 0

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

lnSuccess = 1

* This example uses a previously obtained access token having permission for the 
* Google Drive scope.

* The access token (and refresh token) was previously saved to a JSON file with this format:
* See Get Google Drive OAuth2 Access Token

* {
*   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
*   "expires_in": 3600,
*   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
*   "scope": "https://www.googleapis.com/auth/drive",
*   "token_type": "Bearer"
* }

loJson = CreateObject('Chilkat.JsonObject')
lcTokenFilePath = "qa_data/tokens/googleDrive.json"
loJson.LoadFile(lcTokenFilePath)

loOauth2 = CreateObject('Chilkat.OAuth2')
loOauth2.AccessToken = loJson.StringOf("access_token")
loOauth2.RefreshToken = loJson.StringOf("refresh_token")

loOauth2.AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
loOauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

*  Replace these with actual values.
loOauth2.ClientId = "GOOGLE-CLIENT-ID"
loOauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"
loOauth2.Scope = "https://www.googleapis.com/auth/drive"

* Use OAuth2 to refresh the access token.
lnSuccess = loOauth2.RefreshAccessToken()
IF (lnSuccess <> 1) THEN
    ? loOauth2.LastErrorText
    RELEASE loJson
    RELEASE loOauth2
    CANCEL
ENDIF

? loOauth2.AccessTokenResponse

* Save the new access token to our JSON file (so we can refresh it again when needed).
loJson.UpdateString("access_token",loOauth2.AccessToken)

loFac = CreateObject('Chilkat.FileAccess')
loFac.WriteEntireTextFile(lcTokenFilePath,loJson.Emit(),"utf-8",0)

? "Access Token Refreshed!"

RELEASE loJson
RELEASE loOauth2
RELEASE loFac