Failed to validate OAuth signature and token twitter integration ios GTM-OAuth - ios

Question

I am using following code to handle twitter integration in my Application.
- (IBAction)signInWithTwitter:(id)sender {
NSURL *requestURL = [NSURL URLWithString:#"https://api.twitter.com/oauth/request_token"];
NSURL *accessURL = [NSURL URLWithString:#"https://api.twitter.com/oauth/access_token"];
NSURL *authorizeURL = [NSURL URLWithString:#"https://api.twitter.com/oauth/authorize"];
NSString *scope = #"http://api.twitter.com/";
GTMOAuthAuthentication *auth = [self authForTwitter];
[auth setCallback:#"http://www.noop.com/OAuthCallback"];
GTMOAuthViewControllerTouch *viewController;
viewController = [[GTMOAuthViewControllerTouch alloc] initWithScope:scope
language:nil
requestTokenURL:requestURL
authorizeTokenURL:authorizeURL
accessTokenURL:accessURL
authentication:auth
appServiceName:#"CK12: Twitter"
delegate:self
finishedSelector:#selector(viewController:finishedWithAuth:error:)];
}
- (GTMOAuthAuthentication *)authForTwitter {
GTMOAuthAuthentication *auth = [[GTMOAuthAuthentication alloc] initWithSignatureMethod:kGTMOAuthSignatureMethodHMAC_SHA1
consumerKey:TWITTER_CONSUMER_KEY
privateKey:TWITTER_CONSUMER_SECRET];
[auth setServiceProvider:#"Twitter"];
return auth;
}
My problem is, if I am changing device time i.e making it 1 hour late, then I am getting following error:
Error Domain=com.google.HTTPStatus Code=401 and error message is : failed to validate oauth signature and token .
So can anybody please suggest how to solve this. if system time is wrong then also I want to make it work .

Answer 1

Finally I got solution for this . . . .
One of the reason we get this error "Failed to validate OAuth signature and token"
when system time is wrong . Because OAuth request carry system timestamp parameters with it , so when device time is not within the 5 minutes of twitter server time .we get "Failed to validate OAuth signature and token" .
There are two ways to make it work , if the device time is even wrong .
1.make HTTP HEAD request to an endpoint on api.twitter.com -- you'll get a Date HTTP header in the response that indicates the current time understood by Twitter. You would then convert this to epoch time and adjust your oauth_timestamp values by a determined offset.
2.There's a small iOS library named ios-ntp link: http://code.google.com/p/ios-ntp . use this to get the current Accurate time .
After that i just set the timestamp of OAuth object in the following method
- (GTMOAuthAuthentication *)authForTwitter
{
GTMOAuthAuthentication *auth = [[GTMOAuthAuthentication alloc]
initWithSignatureMethod:kGTMOAuthSignatureMethodHMAC_SHA1
consumerKey:TWITTER_CONSUMER_KEY
privateKey:TWITTER_CONSUMER_SECRET];
[auth setServiceProvider:#"Twitter"];
NSDate * currentdate = //GET ACCURATE DATE HERE ;
[auth setTimestamp:[NSString stringWithFormat:#"%f",[currentdate timeIntervalSince1970]]];
return auth;
}
that's it . . .Happy Coding :)