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(VB.NET UWP/WinRT) Google Drive Refresh Access TokenDemonstrates how to automatically refresh the access token when it expires.
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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