Firebase iOS Codelab Swift

$ git clone https://github.com/firebase/codelab-friendlychat-ios 

import Firebase 

  func application(_ application: UIApplication, didFinishLaunchingWithOptions       launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {   FirebaseApp.configure()   GIDSignIn.sharedInstance().delegate = self   return true } 

{   "rules": {     "messages": {       ".read": "auth != null",       ".write": "auth != null"     }   } } 

pod 'Firebase/Auth' 

  func application(_ application: UIApplication, didFinishLaunchingWithOptions       launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {   FirebaseApp.configure()   GIDSignIn.sharedInstance().clientID = FirebaseApp.app()?.options.clientID   GIDSignIn.sharedInstance().delegate = self   return true } 

  func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error?) {     if let error = error {       print("Error \(error)")       return     }      guard let authentication = user.authentication else { return }     let credential = GoogleAuthProvider.credential(withIDToken: authentication.idToken,                                                       accessToken: authentication.accessToken)     Auth.auth().signIn(with: credential) { (user, error) in       if let error = error {         print("Error \(error)")         return       }     }   } 

  override func viewDidLoad() {     super.viewDidLoad()     GIDSignIn.sharedInstance().uiDelegate = self     GIDSignIn.sharedInstance().signInSilently()     handle = Auth.auth().addStateDidChangeListener() { (auth, user) in       if user != nil {         MeasurementHelper.sendLoginEvent()         self.performSegue(withIdentifier: Constants.Segues.SignInToFp, sender: nil)       }     }   }    deinit {     if let handle = handle {       Auth.auth().removeStateDidChangeListener(handle)     }   } 

  @IBAction func signOut(_ sender: UIButton) {     let firebaseAuth = Auth.auth()     do {       try firebaseAuth.signOut()       dismiss(animated: true, completion: nil)     } catch let signOutError as NSError {       print ("Error signing out: \(signOutError.localizedDescription)")     }   } 

pod 'Firebase/Database' 

  deinit {     if let refHandle = _refHandle {       self.ref.child("messages").removeObserver(withHandle: _refHandle)     }   }     func configureDatabase() {     ref = Database.database().reference()     // Listen for new messages in the Firebase database     _refHandle = self.ref.child("messages").observe(.childAdded, with: { [weak self] (snapshot) -> Void in       guard let strongSelf = self else { return }       strongSelf.messages.append(snapshot)       strongSelf.clientTable.insertRows(at: [IndexPath(row: strongSelf.messages.count-1, section: 0)], with: .automatic)     })   }     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {     // Dequeue cell     let cell = self.clientTable.dequeueReusableCell(withIdentifier: "tableViewCell", for: indexPath)     // Unpack message from Firebase DataSnapshot     let messageSnapshot = self.messages[indexPath.row]     guard let message = messageSnapshot.value as? [String: String] else { return cell }     let name = message[Constants.MessageFields.name] ?? ""     let text = message[Constants.MessageFields.text] ?? ""     cell.textLabel?.text = name + ": " + text     cell.imageView?.image = UIImage(named: "ic_account_circle")     if let photoURL = message[Constants.MessageFields.photoURL], let URL = URL(string: photoURL),         let data = try? Data(contentsOf: URL) {       cell.imageView?.image = UIImage(data: data)     }     return cell   } 

  func sendMessage(withData data: [String: String]) {     var mdata = data     mdata[Constants.MessageFields.name] = Auth.auth().currentUser?.displayName     if let photoURL = Auth.auth().currentUser?.photoURL {       mdata[Constants.MessageFields.photoURL] = photoURL.absoluteString     }      // Push data to Firebase Database     self.ref.child("messages").childByAutoId().setValue(mdata)   } 

pod 'Firebase/Storage' 

  func configureStorage() {     storageRef = Storage.storage().reference()   } 

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {     // Dequeue cell     let cell = self.clientTable .dequeueReusableCell(withIdentifier: "tableViewCell", for: indexPath)     // Unpack message from Firebase DataSnapshot     let messageSnapshot: DataSnapshot! = self.messages[indexPath.row]     guard let message = messageSnapshot.value as? [String:String] else { return cell }     let name = message[Constants.MessageFields.name] ?? ""     if let imageURL = message[Constants.MessageFields.imageURL] {       if imageURL.hasPrefix("gs://") {         Storage.storage().reference(forURL: imageURL).getData(maxSize: INT64_MAX) {(data, error) in           if let error = error {             print("Error downloading: \(error)")             return           }           DispatchQueue.main.async {             cell.imageView?.image = UIImage.init(data: data!)             cell.setNeedsLayout()           }         }       } else if let URL = URL(string: imageURL), let data = try? Data(contentsOf: URL) {         cell.imageView?.image = UIImage.init(data: data)       }       cell.textLabel?.text = "sent by: \(name)"     } else {       let text = message[Constants.MessageFields.text] ?? ""       cell.textLabel?.text = name + ": " + text       cell.imageView?.image = UIImage(named: "ic_account_circle")       if let photoURL = message[Constants.MessageFields.photoURL], let URL = URL(string: photoURL),           let data = try? Data(contentsOf: URL) {         cell.imageView?.image = UIImage(data: data)       }     }     return cell   } 

  func imagePickerController(_ picker: UIImagePickerController,     didFinishPickingMediaWithInfo info: [String : Any]) {       picker.dismiss(animated: true, completion:nil)     guard let uid = Auth.auth().currentUser?.uid else { return }      // if it's a photo from the library, not an image from the camera     if #available(iOS 8.0, *), let referenceURL = info[UIImagePickerControllerReferenceURL] as? URL {       let assets = PHAsset.fetchAssets(withALAssetURLs: [referenceURL], options: nil)       let asset = assets.firstObject       asset?.requestContentEditingInput(with: nil, completionHandler: { [weak self] (contentEditingInput, info) in         let imageFile = contentEditingInput?.fullSizeImageURL         let filePath = "\(uid)/\(Int(Date.timeIntervalSinceReferenceDate * 1000))/\((referenceURL as AnyObject).lastPathComponent!)"         guard let strongSelf = self else { return }         strongSelf.storageRef.child(filePath)           .putFile(from: imageFile!, metadata: nil) { (metadata, error) in             if let error = error {               let nsError = error as NSError               print("Error uploading: \(nsError.localizedDescription)")               return             }             strongSelf.sendMessage(withData: [Constants.MessageFields.imageURL: strongSelf.storageRef.child((metadata?.path)!).description])           }       })     } else {       guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage else { return }       let imageData = UIImageJPEGRepresentation(image, 0.8)       let imagePath = "\(uid)/\(Int(Date.timeIntervalSinceReferenceDate * 1000)).jpg"       let metadata = StorageMetadata()       metadata.contentType = "image/jpeg"       self.storageRef.child(imagePath)         .putData(imageData!, metadata: metadata) { [weak self] (metadata, error) in           if let error = error {             print("Error uploading: \(error)")             return           }           guard let strongSelf = self else { return }           strongSelf.sendMessage(withData: [Constants.MessageFields.imageURL: strongSelf.storageRef.child((metadata?.path)!).description])       }     }   }