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(C#) Google Drive Refresh Access TokenDemonstrates how to automatically refresh the access token when it expires.
bool success = 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" // } Chilkat.JsonObject json = new Chilkat.JsonObject(); string tokenFilePath = "qa_data/tokens/googleDrive.json"; json.LoadFile(tokenFilePath); Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2(); oauth2.AccessToken = json.StringOf("access_token"); oauth2.RefreshToken = json.StringOf("refresh_token"); Chilkat.Rest rest = new Chilkat.Rest(); // Connect using TLS. bool bAutoReconnect = true; success = rest.Connect("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.. string jsonResponse = rest.FullRequestNoBody("DELETE","/drive/v3/files/trash"); if (rest.LastMethodSuccess != true) { Debug.WriteLine(rest.LastErrorText); return; } // 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) { 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 = oauth2.RefreshAccessToken(); if (success != true) { Debug.WriteLine(oauth2.LastErrorText); return; } // Save the new access token to our XML file (so we can refresh it again when needed). json.UpdateString("access_token",oauth2.AccessToken); Chilkat.FileAccess fac = 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 = rest.FullRequestNoBody("DELETE","/drive/v3/files/trash"); if (rest.LastMethodSuccess != true) { Debug.WriteLine(rest.LastErrorText); return; } } // 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) { Debug.WriteLine("response status code = " + Convert.ToString(rest.ResponseStatusCode)); Debug.WriteLine("response status text = " + rest.ResponseStatusText); Debug.WriteLine("response header: " + rest.ResponseHeader); Debug.WriteLine("response JSON: " + jsonResponse); return; } Debug.WriteLine("Trash Emptied!"); |
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