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(Unicode C++) Google Drive Refresh Access TokenDemonstrates how to automatically refresh the access token when it expires.
#include <CkJsonObjectW.h> #include <CkOAuth2W.h> #include <CkRestW.h> #include <CkFileAccessW.h> void ChilkatSample(void) { 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" // } CkJsonObjectW json; const wchar_t *tokenFilePath = L"qa_data/tokens/googleDrive.json"; json.LoadFile(tokenFilePath); CkOAuth2W oauth2; oauth2.put_AccessToken(json.stringOf(L"access_token")); oauth2.put_RefreshToken(json.stringOf(L"refresh_token")); CkRestW rest; // Connect using TLS. bool bAutoReconnect = true; success = rest.Connect(L"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.. const wchar_t *jsonResponse = rest.fullRequestNoBody(L"DELETE",L"/drive/v3/files/trash"); if (rest.get_LastMethodSuccess() != true) { wprintf(L"%s\n",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.get_ResponseStatusCode() == 401) { wprintf(L"Refreshing access token...\n"); oauth2.put_AuthorizationEndpoint(L"https://accounts.google.com/o/oauth2/v2/auth"); oauth2.put_TokenEndpoint(L"https://www.googleapis.com/oauth2/v4/token"); // Replace these with actual values. oauth2.put_ClientId(L"GOOGLE-CLIENT-ID"); oauth2.put_ClientSecret(L"GOOGLE-CLIENT-SECRET"); oauth2.put_Scope(L"https://www.googleapis.com/auth/drive"); // Use OAuth2 to refresh the access token. success = oauth2.RefreshAccessToken(); if (success != true) { wprintf(L"%s\n",oauth2.lastErrorText()); return; } // Save the new access token to our XML file (so we can refresh it again when needed). json.UpdateString(L"access_token",oauth2.accessToken()); CkFileAccessW fac; fac.WriteEntireTextFile(tokenFilePath,json.emit(),L"utf-8",false); wprintf(L"Access Token Refreshed!\n"); // Retry the request with the new access token.. jsonResponse = rest.fullRequestNoBody(L"DELETE",L"/drive/v3/files/trash"); if (rest.get_LastMethodSuccess() != true) { wprintf(L"%s\n",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.get_ResponseStatusCode() != 204) { wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode()); wprintf(L"response status text = %s\n",rest.responseStatusText()); wprintf(L"response header: %s\n",rest.responseHeader()); wprintf(L"response JSON: %s\n",jsonResponse); return; } wprintf(L"Trash Emptied!\n"); } |
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