get authorization from Fitbit using Oauth in iOS - ios

Question

I want implement OAuth authentication for Fitbit to read the data from FitBit Api in my iOS app. I registered my app and i got clientId and client secret. I have been searched from past 2 days for tutorial, libraries. I am not any getting any idea about it. Please suggest me.

Answer 1

Note - According to https://dev.fitbit.com/docs/oauth2/
Applications should upgrade to OAuth 2.0 by March 14, 2016
Use safari or SFSafariViewController to open authorization page
Solution starts from here
please replace CLIENT_ID, REDIRECT_URI and other text to correct information
Point1-
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:#"https://www.fitbit.com/oauth2/authorize?response_type=code&client_id=CLIENT_ID&redirect_uri=REDIRECT_URI&scope=activity%20nutrition%20heartrate%20location%20nutrition%20profile%20settings%20sleep%20social%20weight"]];
give proper scheme url, so that after successful login you will be redirected to your application. In openURL method you will get a OAUTHCODE
Point2-
Now get OAUTHTOKEN by using this OAUTHCODE
-(void)toGetRequestToken:(id)sender
{
NSString *strCode = [[NSUserDefaults standardUserDefaults] valueForKey:#"auth_code"];
NSURL *baseURL = [NSURL URLWithString:#"https://www.fitbit.com/oauth2/authorize"];
AFOAuth2Manager *OAuth2Manager = [AFOAuth2Manager managerWithBaseURL:baseURL clientID:CLIENT_ID secret:CONSUMER_SECRET];
OAuth2Manager.responseSerializer.acceptableContentTypes = [OAuth2Manager.responseSerializer.acceptableContentTypes setByAddingObject:#"text/html"];
NSDictionary *dict = #{#"client_id":CLIENT_ID, #"grant_type":#"authorization_code",#"redirect_uri":#"Pro-Fit://fitbit",#"code":strCode};
[OAuth2Manager authenticateUsingOAuthWithURLString:#"https://api.fitbit.com/oauth2/token" parameters:dict success:^(AFOAuthCredential *credential) {
// you can save this credential object for further use
// inside it you can find access token also
NSLog(#"Token: %#", credential.accessToken);
} failure:^(NSError *error) {
NSLog(#"Error: %#", error);
}];
}
Point3-
now you can hit other FitBit requests like for "UserProfile" --
-(void)getFitbitUserProfile:(AFOAuthCredential*)credential{
NSURL *baseURL = [NSURL URLWithString:#"https://www.fitbit.com/oauth2/authorize"];
AFHTTPSessionManager *manager =
[[AFHTTPSessionManager alloc] initWithBaseURL:baseURL];
[manager.requestSerializer setAuthorizationHeaderFieldWithCredential:credential];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[manager GET:#"https://api.fitbit.com/1/user/-/profile.json"
parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
NSDictionary *dictResponse = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
NSDictionary *userDict =[dictResponse valueForKey:#"user"];
NSLog(#"Success: %#", userDict);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
NSLog(#"Failure: %#", error);
}];
}