gistfile1.txt

override func didSelectPost() {
        let extensionItem = extensionContext?.inputItems.first as! NSExtensionItem
        let itemProvider = extensionItem.attachments?.first as! NSItemProvider
        let contentType = String(kUTTypePropertyList)
        
        if itemProvider.hasItemConformingToTypeIdentifier(contentType) {
            itemProvider.loadItemForTypeIdentifier(contentType, options: nil, completionHandler: { (item, error) -> Void in
                let itemDict = item as! NSDictionary
                NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
                    let results = itemDict[NSExtensionJavaScriptPreprocessingResultsKey] as! NSDictionary
                    self.articleUrlString = results.objectForKey("currentUrl") as! String
                    
                    dispatch_async(dispatch_get_main_queue(), { () -> Void in
                        self.postArticleToFirebase()
                    })
                })
            })
        } else {
            print("Error")
        }
    }
    
    func postArticleToFirebase() {
        let articleURL = NSURL(string: "https://co2.firebaseio.com/posts.json")
        let postRequest = NSMutableURLRequest(URL: articleURL!)
        let postSession = NSURLSession.sharedSession()
        
        do {
            postRequest.HTTPBody = try NSJSONSerialization.dataWithJSONObject(createPostDictionary(), options: .PrettyPrinted)
        } catch {
            print(error)
        }
        postRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
        postRequest.HTTPMethod = "POST"
        
        let sessionTask = postSession.dataTaskWithRequest(postRequest) { (data, response, postError) -> Void in
            if postError != nil {
                print("Failure with error: \(postError?.localizedDescription)")
            } else {
                let postSuccessAlertView = UIAlertController(title: "Success!", message: "Your post has been shared", preferredStyle: .Alert)
                let cancelAction = UIAlertAction(title: "Ok", style: .Cancel, handler: { (alertAction) -> Void in
                    self.extensionContext?.completeRequestReturningItems([], completionHandler: nil)
                })
                postSuccessAlertView.addAction(cancelAction)
                self.presentViewController(postSuccessAlertView, animated: true, completion: nil)
                print("Posted!")
            }
        }
        sessionTask.resume()
    }