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

Demonstrates how to refresh a Google Access Token. Refreshing an oauth2 access token does not need to display an interactive browser like when originally getting the OAuth2 access token for the 1st time. Your application can do it automatically without user interaction.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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


' It is assumed we previously obtained an OAuth2 access token.
' This example loads the JSON access token file 
' saved by this example: Get Google Photos OAuth2 Access Token

Dim jsonToken As New Chilkat.JsonObject
Dim success As Boolean = jsonToken.LoadFile("qa_data/tokens/googlePhotos.json")
If (success <> True) Then
    Debug.WriteLine("Failed to load googlePhotos.json")
    Exit Sub
End If


' The access token JSON looks like this:

' {
'   "access_token": "ya29.GlamBqWR6cp8lEfJMmTHVEua45912XLKoq4djyHl_Z3CEIzsPLIZkJSGie5oOrbaggy1rjJHn1zW5bjqSesGr5MEYIp9Hx-0CuvjVYf8srg2jeaDMwMACvzemp43",
'   "expires_in": 3600,
'   "refresh_token": "1/rl6k16nysDl9Bp1EhRH9F1WyRIoiSQAvko49Z4yY694MT5V1QXLj2ibNZGaRgek0",
'   "scope": "https://www.googleapis.com/auth/photoslibrary",
'   "token_type": "Bearer"
' }


Dim oauth2 As New Chilkat.OAuth2

oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

' Replace these with actual values.
oauth2.ClientId = "GOOGLE-CLIENT-ID"
oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"

' Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

' Send the HTTP POST to refresh the access token..
success = Await oauth2.RefreshAccessTokenAsync()
If (success <> True) Then
    Debug.WriteLine(oauth2.LastErrorText)
    Exit Sub
End If



' The response contains a new access token, but we must keep
' our existing refresh token for when we need to refresh again in the future.
jsonToken.UpdateString("access_token",oauth2.AccessToken)

' Save the new JSON access token response to a file.
Dim sbJson As New Chilkat.StringBuilder
jsonToken.EmitCompact = False
jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/googlePhotos.json","utf-8",False)

Debug.WriteLine("OAuth2 authorization granted!")
Debug.WriteLine("New Access Token = " & oauth2.AccessToken)