getting access token from sound cloud?

Question

I want to retrieve some private tracks from sound cloud account, I have client_id, client_secret, username and password of the sound cloud account(from where I want to retrieve the tracks). I found following code from sound cloud docs which is in php, but I want to implement that in objective C i.e in iOS.

$ curl -X POST "https://api.soundcloud.com/oauth2/token" \\
           -F 'client_id=YOUR_CLIENT_ID' \\
           -F 'client_secret=YOUR_CLIENT_SECRET' \\
           -F 'grant_type=authorization_code' \\
           -F 'redirect_uri=http://yourapp.com/soundcloud/oauth-callback' \\
           -F 'code=0000000EYAA1CRGodSoKJ9WsdhqVQr3g'

output

{ "access_token": "04u7h-4cc355-70k3n", "scope": "non-expiring" }

I am already using sound cloud sdk to fetch the public tracks from sound cloud artist, but now unable to fetch the private tracks from my sound cloud account.

Answer 1

+ (void)getAccessTokenWithCompletion:(callBackResponse)completion
{
    NSString *BaseURI = @"https://api.soundcloud.com";
    NSString *OAuth2TokenURI = @"/oauth2/token";

    NSString *requestURL = [BaseURI stringByAppendingString:OAuth2TokenURI];

    SCRequestResponseHandler handler;
    handler = ^(NSURLResponse *response, NSData *data, NSError *error) {
        NSError *jsonError = nil;
        NSJSONSerialization *jsonResponse = [NSJSONSerialization
                                             JSONObjectWithData:data
                                             options:0
                                             error:&jsonError];
        if (!jsonError)
        {
            NSLog(@"output of getToken\n%@",jsonResponse);
            NSDictionary* serverResponse = (NSDictionary*)jsonResponse;
            if ([serverResponse objectForKey:@"access_token"])
            {
                accessToken = [serverResponse objectForKey:@"access_token"];
                [[NSUserDefaults standardUserDefaults] setObject:accessToken forKey:SC_ACCESS_TOKEN_KEY];
                NSDictionary *dict=[[NSDictionary alloc]initWithObjectsAndKeys:accessToken,SC_ACCESS_TOKEN_KEY,nil];
                completion(dict);
            }
            else
                completion(nil);
        }
    };


    NSMutableDictionary *parameter=[[NSMutableDictionary alloc]init];
    [parameter setObject:@"password" forKey:@"grant_type"];
    [parameter setObject:CLIENT_ID forKey:@"client_id"];
    [parameter setObject:CLIENT_SECRET forKey:@"client_secret"];
    [parameter setObject:CLIENT_USERNAME forKey:@"username"];
    [parameter setObject:CLIENT_PASSWORD forKey:@"password"];
    [parameter setObject:@"non-expiring" forKey:@"scope"];


    [SCRequest performMethod:SCRequestMethodPOST
                  onResource:[NSURL URLWithString:requestURL]
             usingParameters:parameter
                 withAccount:nil
      sendingProgressHandler:nil
             responseHandler:handler];
}

This gives me non-expiring token, and advantage is I am using soundcloud sdk, that makes it litle easy

Answer 2

This code worked for me in some my projects:

- (void)getToken {
  NSString *BaseURI = @"https://api.soundcloud.com";
  NSString *OAuth2TokenURI = @"/oauth2/token";

  NSString *requestURL = [BaseURI stringByAppendingString:OAuth2TokenURI];
  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:requestURL]
                                                         cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                                                     timeoutInterval:60.0f];

  NSString *requestBody = @"grant_type=password";
  requestBody = [requestBody stringByAppendingFormat:@"&client_id=%@", OAuth2ClientID];
  requestBody = [requestBody stringByAppendingFormat:@"&client_secret=%@", OAuth2ClientSecret];
  requestBody = [requestBody stringByAppendingFormat:@"&username=%@", userName];
  requestBody = [requestBody stringByAppendingFormat:@"&password=%@", userPassword];

  [request setHTTPMethod:@"POST"];
  [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
  [request setValue:@"OAuth" forHTTPHeaderField:@"Authorization"];
  [request setValue:[NSString stringWithFormat:@"%d", [requestBody length]] forHTTPHeaderField:@"Content-Length"];

  [request setHTTPBody:[requestBody dataUsingEncoding:NSUTF8StringEncoding]];

  NSURLConnection *tokenURLConnection = [[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];
  self.receivedData = [NSMutableData data];
}

Also it is need to set NSURLConnection Delegate Methods.

It's usual code:

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData {
    [self.receivedData appendData:theData];
}

And here SBJSON parser was used. You can use it or replace it with any other JSON-parser, but then you need to change code for parsing JSON, it's not hard:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSString *accessToken;
    NSString *jsonString = [[[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding] autorelease];
    SBJsonParser *jsonParser = [[[SBJsonParser alloc] init] autorelease];
    serverResponse = [jsonParser objectWithString:jsonString];

    if ([serverResponse objectForKey:@"access_token"]) {
        accessToken = [serverResponse objectForKey:@"access_token"];
    }
}