(Xojo Plugin) Google Drive Refresh Access Token

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

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

Dim success As Boolean
success = True

// 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
tokenFilePath = "qa_data/tokens/googleDrive.json"
success = json.LoadFile(tokenFilePath)

Dim oauth2 As New Chilkat.OAuth2
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 <> True) Then
    System.DebugLog(oauth2.LastErrorText)
    Return
End If

System.DebugLog(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 Chilkat.FileAccess
success = fac.WriteEntireTextFile(tokenFilePath,json.Emit(),"utf-8",False)

System.DebugLog("Access Token Refreshed!")