how could i integrate via me social site into iphone app - xcode

Question

hi i want to integrate Via Me social site into my iphone app,i googled but didn't find any samples.

Answer 1

The basic process is as follows:
Create a custom URL scheme for your app. Via Me will use this after the user has been authenticated, to return to your app. In my example, I created one called "robviame://"
Register your app at http://via.me/developers. This will give you a client id and a client secret:
When you want to authenticate the user, you call:
NSString *redirectUri = [[self redirectURI] stringByAddingPercentEscapesForURLParameterUsingEncoding:NSUTF8StringEncoding];
NSString *urlString = [NSString stringWithFormat:#"https://api.via.me/oauth/authorize/?client_id=%#&redirect_uri=%#&response_type=code", kClientID, redirectUri];
NSURL *url = [NSURL URLWithString:urlString];
[[UIApplication sharedApplication] openURL:url];
What that will do is fire up your web browser and give the user a chance to log on and grant permissions to your app. When user finishes that process, because you've defined your custom URL scheme, it will call the following method in your app delegate:
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
// do whatever you want here to parse the code provided back to the app
}
for example, I'll call a handler for my Via Me response:
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
ViaMeManager *viaMeManager = [ViaMeManager sharedManager];
if ([[url host] isEqualToString:viaMeManager.host])
{
[viaMeManager handleViaMeResponse:[self parseQueryString:[url query]]];
return YES;
}
return NO;
}
// convert the query string into a dictionary
- (NSDictionary *)parseQueryString:(NSString *)query
{
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
NSArray *queryParameters = [query componentsSeparatedByString:#"&"];
for (NSString *queryParameter in queryParameters) {
NSArray *elements = [queryParameter componentsSeparatedByString:#"="];
NSString *key = [elements[0] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *value = [elements[1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
value = [[value componentsSeparatedByString:#"+"] componentsJoinedByString:#" "];
[dictionary setObject:value forKey:key];
}
return dictionary;
}
That handler might, for example, save the code and then request the access token:
- (void)handleViaMeResponse:(NSDictionary *)parameters
{
self.code = parameters[#"code"];
if (self.code)
{
// save the code
[[NSUserDefaults standardUserDefaults] setValue:self.code forKey:kViaMeUserDefaultKeyCode];
[[NSUserDefaults standardUserDefaults] synchronize];
// now let's authenticate the user and get an access key
[self requestToken];
}
else
{
NSLog(#"%s: parameters = %#", __FUNCTION__, parameters);
NSString *errorCode = parameters[#"error"];
if ([errorCode isEqualToString:#"access_denied"])
{
[[[UIAlertView alloc] initWithTitle:nil
message:#"Via Me functions will not be enabled because you did not authorize this app"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil] show];
}
else
{
[[[UIAlertView alloc] initWithTitle:nil
message:#"Unknown Via Me authorization error"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil] show];
}
}
}
and the code to retrieve the token might look like:
- (void)requestToken
{
NSURL *url = [NSURL URLWithString:#"https://api.via.me/oauth/access_token"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
NSDictionary *paramsDictionary = #{#"client_id" : kClientID,
#"client_secret" : kClientSecret,
#"grant_type" : #"authorization_code",
#"redirect_uri" : [self redirectURI],
#"code" : self.code,
#"response_type" : #"token"
};
NSMutableArray *paramsArray = [NSMutableArray array];
[paramsDictionary enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
[paramsArray addObject:[NSString stringWithFormat:#"%#=%#", key, [obj stringByAddingPercentEscapesForURLParameterUsingEncoding:NSUTF8StringEncoding]]];
}];
NSData *paramsData = [[paramsArray componentsJoinedByString:#"&"] dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:paramsData];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
if (error)
{
NSLog(#"%s: NSURLConnection error = %#", __FUNCTION__, error);
return;
}
NSError *parseError;
id results = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
if (parseError)
{
NSLog(#"%s: NSJSONSerialization error = %#", __FUNCTION__, parseError);
return;
}
self.accessToken = results[#"access_token"];
if (self.accessToken)
{
[[NSUserDefaults standardUserDefaults] setValue:self.accessToken forKey:kViaMeUserDefaultKeyAccessToken];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}];
}
Hopefully this will be enough to get you going. This is described in greater detail at the http://via.me/developers page.