Post image to twitter using only Parse for authentication and NSURLConnection

PostToTwitterTwitter.swift

func post (tweetString: String, tweetImage: NSData) {
		
		let uploadUrl = NSURL(string: "https://upload.twitter.com/1.1/media/upload.json")
		
		let uploadRequest = NSMutableURLRequest(URL: uploadUrl!)
		uploadRequest.HTTPMethod = "POST"
		
		let stringBoundary = "---------------------------14737809831466499882746641449"
		let contentType = "multipart/form-data; boundary=\(stringBoundary)"
		uploadRequest.addValue(contentType, forHTTPHeaderField:"Content-Type")
		
		let body = NSMutableData()
		body.appendData("--\(stringBoundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
		body.appendData("Content-Disposition: form-data; name=\"media\"; filename=\"a.jpg\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
		body.appendData("Content-Type: image/jpeg\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
		body.appendData(tweetImage)
		body.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
		body.appendData("--\(stringBoundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
		uploadRequest.HTTPBody = body
		
		PFTwitterUtils.twitter()!.signRequest(uploadRequest)
		
		NSURLConnection.sendAsynchronousRequest(uploadRequest, queue: NSOperationQueue.mainQueue(),
			completionHandler: { (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in
				
				RCLog(response)
				RCLog(NSString(data: data!, encoding: NSUTF8StringEncoding))
				RCLogErrorO(error)
				if let mediaDict = self.nsdataToJSON(data!) {
					RCLog(mediaDict)
					let bodyString = "status=\(tweetString)&media_ids=\(mediaDict["media_id_string"])"
					let url = NSURL(string: "https://api.twitter.com/1.1/statuses/update.json")
					let tweetRequest = NSMutableURLRequest(URL: url!)
					tweetRequest.HTTPMethod = "POST"
					tweetRequest.HTTPBody = bodyString.dataUsingEncoding(NSUTF8StringEncoding)
					PFTwitterUtils.twitter()!.signRequest(tweetRequest)
					
					NSURLConnection.sendAsynchronousRequest(tweetRequest, queue: NSOperationQueue.mainQueue(),
						completionHandler: { (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in
							
							RCLog(response)
							RCLogErrorO(error)
					})
				}
		})
	}
	
	func nsdataToJSON (data: NSData) -> AnyObject? {
		do {
			return try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers)
		} catch let myJSONError {
			print(myJSONError)
		}
		return nil
	}