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(Objective-C) Google Drive Refresh Access TokenDemonstrates how to automatically refresh the access token when it expires.
#import <CkoJsonObject.h> #import <NSString.h> #import <CkoOAuth2.h> #import <CkoRest.h> #import <CkoFileAccess.h> BOOL success = YES; // 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" // } CkoJsonObject *json = [[CkoJsonObject alloc] init]; NSString *tokenFilePath = @"qa_data/tokens/googleDrive.json"; [json LoadFile: tokenFilePath]; CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init]; oauth2.AccessToken = [json StringOf: @"access_token"]; oauth2.RefreshToken = [json StringOf: @"refresh_token"]; CkoRest *rest = [[CkoRest alloc] init]; // Connect using TLS. BOOL bAutoReconnect = YES; success = [rest Connect: @"www.googleapis.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: 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.. NSString *jsonResponse = [rest FullRequestNoBody: @"DELETE" uriPath: @"/drive/v3/files/trash"]; if (rest.LastMethodSuccess != YES) { NSLog(@"%@",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 intValue] == 401) { NSLog(@"%@",@"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 != YES) { NSLog(@"%@",oauth2.LastErrorText); return; } // Save the new access token to our XML file (so we can refresh it again when needed). [json UpdateString: @"access_token" value: oauth2.AccessToken]; CkoFileAccess *fac = [[CkoFileAccess alloc] init]; [fac WriteEntireTextFile: tokenFilePath fileData: [json Emit] charset: @"utf-8" includePreamble: NO]; NSLog(@"%@",@"Access Token Refreshed!"); // Retry the request with the new access token.. jsonResponse = [rest FullRequestNoBody: @"DELETE" uriPath: @"/drive/v3/files/trash"]; if (rest.LastMethodSuccess != YES) { NSLog(@"%@",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 intValue] != 204) { NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]); NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText); NSLog(@"%@%@",@"response header: ",rest.ResponseHeader); NSLog(@"%@%@",@"response JSON: ",jsonResponse); return; } NSLog(@"%@",@"Trash Emptied!"); |
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