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VB.NET UWP/WinRT Examples

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(VB.NET UWP/WinRT) Google Drive Refresh Access Token

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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

Dim success As Boolean = True

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

' 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 Chilkat.JsonObject
Dim tokenFilePath As String = "qa_data/tokens/googleDrive.json"
json.LoadFile(tokenFilePath)

Dim oauth2 As New Chilkat.OAuth2
oauth2.AccessToken = json.StringOf("access_token")
oauth2.RefreshToken = json.StringOf("refresh_token")

Dim rest As New Chilkat.Rest

' Connect using TLS.
Dim bAutoReconnect As Boolean = True
success = Await rest.ConnectAsync("www.googleapis.com",443,True,bAutoReconnect)

' Provide the authentication credentials (i.e. the access token)
rest.SetAuthOAuth2(oauth2)

' We'll test with a simple request to empty trash.
' If our access token expired, we'll get a 401 response..
Dim jsonResponse As String = Await rest.FullRequestNoBodyAsync("DELETE","/drive/v3/files/trash")
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' If the access token expired, we'll get a 401 response status with this response body:
' {
'  "error": {
'   "errors": [
'    {
'     "domain": "global",
'     "reason": "authError",
'     "message": "Invalid Credentials",
'     "locationType": "header",
'     "location": "Authorization"
'    }
'   ],
'   "code": 401,
'   "message": "Invalid Credentials"
'  }
' }
If (rest.ResponseStatusCode = 401) Then

    Debug.WriteLine("Refreshing access 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 = Await oauth2.RefreshAccessTokenAsync()
    If (success <> True) Then
        Debug.WriteLine(oauth2.LastErrorText)
        Exit Sub
    End If


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

    Dim fac As New Chilkat.FileAccess
    fac.WriteEntireTextFile(tokenFilePath,json.Emit(),"utf-8",False)

    Debug.WriteLine("Access Token Refreshed!")

    ' Retry the request with the new access token..
    jsonResponse = Await rest.FullRequestNoBodyAsync("DELETE","/drive/v3/files/trash")
    If (rest.LastMethodSuccess <> True) Then
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If

End If


' A successful response will have a status code equal to 204 and the response body is empty.
' (If not successful, then there should be a JSON response body with information..)
If (rest.ResponseStatusCode <> 204) Then
    Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
    Debug.WriteLine("response status text = " & rest.ResponseStatusText)
    Debug.WriteLine("response header: " & rest.ResponseHeader)
    Debug.WriteLine("response JSON: " & jsonResponse)
    Exit Sub
End If


Debug.WriteLine("Trash Emptied!")

 

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