Having problems with uploading photos to TwitPic using OAuth in Objective C on the iPhone

Question

I have been working on an iPhone app that has a feature of uploading photos to TwitPic. I have it working with basic authentication.

I am trying to get it working with

Answer 1

HA! I found it! We should create the header with https://api.twitter.com/1/account/verify_credentials.json and post to http://api.twitpic.com/2/upload.json! (And use GET)

    NSString *fakeurl = @"https://api.twitter.com/1/account/verify_credentials.json";
NSString *oauth_header = [oAuth oAuthHeaderForMethod:@"GET" andUrl:fakeurl andParams:nil];

NSLog(@"OAuth header : %@\n\n", oauth_header);

NSString *url = @"http://api.twitpic.com/2/upload.json";
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:url]];
request.delegate = self;
[request addRequestHeader:@"User-Agent" value:@"ASIHTTPRequest"];
request.requestMethod = @"GET";

[request addRequestHeader:@"X-Verify-Credentials-Authorization" value:oauth_header];    
[request addRequestHeader:@"X-Auth-Service-Provider" value:@"https://api.twitter.com/1/account/verify_credentials.json"];   


NSData *imageRepresentation = UIImageJPEGRepresentation([UIImage imageNamed:@"IMG_0717.jpg"], 0.2);    
if (imageRepresentation) {
    NSLog(@"Pic not nil");
}
[request setData:imageRepresentation forKey:@"media"];
[request setPostValue:@"twitpic, i hate you. die painfully."  forKey:@"message"];  
[request setPostValue:twitPicKey  forKey:@"key"];  

[request setDelegate:self];
[request setDidFinishSelector:@selector(requestDone:)];
[request setDidFailSelector:@selector(requestFailed:)];

[request start];

Answer 2

OAuth method to generate a header must be GET. Not POST.

Also url must be https://api.twitter.com/1/account/verify_credentials.json

Answer 3

Use GSTwitPicEngine: https://github.com/Gurpartap/GSTwitPicEngine

Using GSTwitPicEngine:

Initialize the engine with class or as needed:

self.twitpicEngine = (GSTwitPicEngine *)[GSTwitPicEngine twitpicEngineWithDelegate:self];

Find the authorization token and supply to twitpicEngine with:

[twitpicEngine setAccessToken:token];

Then to upload image and attach a text message along with it (does not post to twitter):

[twitpicEngine uploadPicture:[UIImage imageNamed:@"mypic.png"]  withMessage:@"Hello world!"]; // This message is supplied back in success delegate call in request's userInfo.

To upload image only:

[twitpicEngine uploadPicture:uploadImageView.image];

Upon end of request, one of the delegate methods is called with appropriate data and information.

---

GSTwitPicEngineDelegate protocol specifies two delegate methods:

- (void)twitpicDidFinishUpload:(NSDictionary *)response {
  NSLog(@"TwitPic finished uploading: %@", response);

  // [response objectForKey:@"parsedResponse"] gives an NSDictionary of the response one of the parsing libraries was available.
  // Otherwise, use [[response objectForKey:@"request"] objectForKey:@"responseString"] to parse yourself.

  if ([[[response objectForKey:@"request"] userInfo] objectForKey:@"message"] > 0 && [[response objectForKey:@"parsedResponse"] count] > 0) {
    // Uncomment to update status upon successful upload, using MGTwitterEngine's instance.
    // [twitterEngine sendUpdate:[NSString stringWithFormat:@"%@ %@", [[[response objectForKey:@"request"] userInfo] objectForKey:@"message"], [[response objectForKey:@"parsedResponse"] objectForKey:@"url"]]];
  }
}

and

- (void)twitpicDidFailUpload:(NSDictionary *)error {
  NSLog(@"TwitPic failed to upload: %@", error);

  if ([[error objectForKey:@"request"] responseStatusCode] == 401) {
    // UIAlertViewQuick(@"Authentication failed", [error objectForKey:@"errorDescription"], @"OK");
  }
}

---

All set?

Answer 4

Thanks, this helped me get it working too :) I also updated http://github.com/jaanus/PlainOAuth with working example code.