SAP Fiori for iOS SDK Code Snippet: SAPURLSession & OnboardingSessionManager

SAPURLSession+Extension.swift

import Foundation
import SAPFoundation
import SAPFioriFlows

public extension SAPURLSession {
    
    /// Unregisters all observers.
    func unregisterAllObservers() {
        observers.forEach( {unregister($0)} )
    }
    
    /// Terminate an active user session from the client using the POST method
    ///
    /// - Parameters:
    ///   - backendURL: SCPms backend URL (BaseURL)
    ///   - completionHandler: A completion handler called after the request
    func logout(backendURL: URL, completionHandler: @escaping (Error?) -> Void) {
        let logoutURL = URL(string: "/mobileservices/sessions/logout", relativeTo: backendURL)!
        
        var logoutRequest = URLRequest(url: logoutURL)
        logoutRequest.httpMethod = SAPURLSession.HTTPMethod.post

        let logoutTask = dataTask(with: logoutRequest) { data, response, error in
            if error == nil {
                // Delete Cache
                URLCache.shared.removeAllCachedResponses()

                // Delete Cookies
                let cookieStorage = HTTPCookieStorage.shared

                if let cookies = cookieStorage.cookies {
                    cookies.forEach({cookieStorage.deleteCookie($0)})
                }
                
                self.invalidateAndCancel()
            }
            
            completionHandler(error)
        }

        logoutTask.taskDescription = "SAPcpms logout request"
        logoutTask.resume()
    }
}

public extension OnboardingSessionManager {

    /// Logout from Server
    ///
    /// - Parameter completionHandler: a completion handler called after logout
    func logout(_ completionHandler: @escaping (Error?) -> Void) {
        guard let urlSession = onboardingSession?.sapURLSession,
            let backendURL = onboardingSession?.settingsParameters?.backendURL else {
                completionHandler(nil)
                return
        }
        
        urlSession.logout(backendURL: backendURL) { (error) in
            if error == nil {
                self.removeSession(completionHandler: completionHandler)
            } else {
                completionHandler(error)
            }
        }
    }
}