Visual Basic 6.0

Google Drive Refresh Access Token

See more Google Drive Examples

Demonstrates how to automatically refresh the access token when it expires. Visual Basic 6.0

Dim success As Long
success = 0

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

success = 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"
' }

Dim json As New ChilkatJsonObject
Dim tokenFilePath As String
tokenFilePath = "qa_data/tokens/googleDrive.json"
success = json.LoadFile(tokenFilePath)

Dim oauth2 As New ChilkatOAuth2
oauth2.AccessToken = json.StringOf("access_token")
oauth2.RefreshToken = json.StringOf("refresh_token")

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

'  Replace these with actual values.
oauth2.ClientId = "GOOGLE-CLIENT-ID"
oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"
oauth2.Scope = "https://www.googleapis.com/auth/drive"

' Use OAuth2 to refresh the access token.
success = oauth2.RefreshAccessToken()
If (success <> 1) Then
    Debug.Print oauth2.LastErrorText
    Exit Sub
End If

Debug.Print oauth2.AccessTokenResponse

' Save the new access token to our JSON file (so we can refresh it again when needed).
success = json.UpdateString("access_token",oauth2.AccessToken)

Dim fac As New CkFileAccess
success = fac.WriteEntireTextFile(tokenFilePath,json.Emit(),"utf-8",0)

Debug.Print "Access Token Refreshed!"