Auth.swift

static func login(completion: (Result<(User, Bool)>) -> ()) {
        let digits = Digits.sharedInstance()
        let oauthSigning = DGTOAuthSigning(authConfig:digits.authConfig, authSession:digits.session())
        let authHeaders = oauthSigning.OAuthEchoHeadersToVerifyCredentials()
        print(authHeaders)
        
        UIPasteboard.generalPasteboard().string = authHeaders.description
        
        guard let urlString = authHeaders[TWTROAuthEchoRequestURLStringKey] as? String else {
            let error = ErrorGenerator.customErrorWithMessage("TWTROAuthEchoRequestURLStringKey not found in auth headers")
            completion(.Error(error))
            return
        }
        
        guard let authorizationHeader = authHeaders[TWTROAuthEchoAuthorizationHeaderKey] as? String else {
            let error = ErrorGenerator.customErrorWithMessage("TWTROAuthEchoAuthorizationHeaderKey not found in auth headers")
            completion(.Error(error))
            return
        }
        
        let request = LoginRequest(oAuthURL: urlString, oAuthURLHeaderKey: TWTROAuthEchoRequestURLStringKey, oAuthHeader: authorizationHeader, oAuthHeaderKey: TWTROAuthEchoAuthorizationHeaderKey)
        request.completionBlock = { (responseObject, error) in
            guard error == nil else {
                completion(.Error(error!))
                return
            }
            
            if let json = responseObject as? [String : AnyObject], let errorMessage = ErrorHelper.anyErrorStringFromJson(json) {
                let customError = ErrorGenerator.getAndHandleErrorWithMessage(errorMessage, additionalInfo: json.description)
                completion(.Error(customError))
                return
            }
            
            guard let token = responseObject?["auth_token"] as? String else {
                let customError = ErrorGenerator.customErrorWithMessage("Login - token not found in response \(responseObject)")
                completion(.Error(customError))
                return
            }
            
            guard let json = responseObject as? [String : AnyObject], let user = AppUser(json: json) else {
                let customError = ErrorGenerator.getAndHandleErrorWithMessage("Login - user not parsed", additionalInfo: "response \(responseObject)")
                completion(.Error(customError))
                return
            }
            
            ServerManager.setAuthToken(token)
            Session.shared.setBackendUser(user)
            PushManager.manager.updatePushesWithLatestToken()
            let newUser = user.firstName() == nil
            if newUser {
                Analytics.setCurrentUser(user)
            } else {
                Analytics.setCurrentUserFirstLogin(user)
            }
            
            let tuple = (user as User, newUser)
            completion(.Success(tuple))
        }
        ServerManager().runRequest(request)
    }