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(VB.NET) Google Calendar -- Refresh an Expired Access TokenSee more Google Calendar ExamplesDemonstrates how to refresh an expired access token. If a Google Calendar REST API call results in a 401 "unauthorized" response, then it is likely the access token expired. An application should be able to automatically refresh the access token with no user interaction and then re-try the request with the newly obtained access token.
' 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 Calendar OAuth2 Access Token Dim jsonToken As New Chilkat.JsonObject Dim success As Boolean = jsonToken.LoadFile("qa_data/tokens/googleCalendar.json") If (success <> True) Then Debug.WriteLine("Failed to load googleCalendar.json") Exit Sub End If ' The access token JSON looks like this: ' { ' "access_token": "abac.Ci-ZabcdF37-NUrmSzxbHxTsMbtlN-uPfabcdAQN_2ekzj0s5ofCzRabcdTDMGaa2Q", ' "token_type": "Bearer", ' "expires_in": 3600, ' "refresh_token": "1/lEe5abcdNJ77eOSDBabcdkQGVmDalkwabcdR2Hatbo" ' } ' 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 = oauth2.RefreshAccessToken() 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/googleCalendar.json","utf-8",False) Debug.WriteLine("OAuth2 authorization granted!") Debug.WriteLine("New Access Token = " & oauth2.AccessToken) |
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