X-Git-Url: https://git.mdrn.pl/wl-app.git/blobdiff_plain/53b27422d140022594fc241cca91c3183be57bca..48b2fe9f7c2dc3d9aeaaa6dbfb27c7da4f3235ff:/iOS/Pods/Alamofire/Source/NetworkReachabilityManager.swift

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+//
+//  NetworkReachabilityManager.swift
+//
+//  Copyright (c) 2014-2017 Alamofire Software Foundation (http://alamofire.org/)
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#if !os(watchOS)
+
+import Foundation
+import SystemConfiguration
+
+/// The `NetworkReachabilityManager` class listens for reachability changes of hosts and addresses for both WWAN and
+/// WiFi network interfaces.
+///
+/// Reachability can be used to determine background information about why a network operation failed, or to retry
+/// network requests when a connection is established. It should not be used to prevent a user from initiating a network
+/// request, as it's possible that an initial request may be required to establish reachability.
+public class NetworkReachabilityManager {
+    /// Defines the various states of network reachability.
+    ///
+    /// - unknown:      It is unknown whether the network is reachable.
+    /// - notReachable: The network is not reachable.
+    /// - reachable:    The network is reachable.
+    public enum NetworkReachabilityStatus {
+        case unknown
+        case notReachable
+        case reachable(ConnectionType)
+    }
+
+    /// Defines the various connection types detected by reachability flags.
+    ///
+    /// - ethernetOrWiFi: The connection type is either over Ethernet or WiFi.
+    /// - wwan:           The connection type is a WWAN connection.
+    public enum ConnectionType {
+        case ethernetOrWiFi
+        case wwan
+    }
+
+    /// A closure executed when the network reachability status changes. The closure takes a single argument: the
+    /// network reachability status.
+    public typealias Listener = (NetworkReachabilityStatus) -> Void
+
+    // MARK: - Properties
+
+    /// Whether the network is currently reachable.
+    public var isReachable: Bool { return isReachableOnWWAN || isReachableOnEthernetOrWiFi }
+
+    /// Whether the network is currently reachable over the WWAN interface.
+    public var isReachableOnWWAN: Bool { return networkReachabilityStatus == .reachable(.wwan) }
+
+    /// Whether the network is currently reachable over Ethernet or WiFi interface.
+    public var isReachableOnEthernetOrWiFi: Bool { return networkReachabilityStatus == .reachable(.ethernetOrWiFi) }
+
+    /// The current network reachability status.
+    public var networkReachabilityStatus: NetworkReachabilityStatus {
+        guard let flags = self.flags else { return .unknown }
+        return networkReachabilityStatusForFlags(flags)
+    }
+
+    /// The dispatch queue to execute the `listener` closure on.
+    public var listenerQueue: DispatchQueue = DispatchQueue.main
+
+    /// A closure executed when the network reachability status changes.
+    public var listener: Listener?
+
+    private var flags: SCNetworkReachabilityFlags? {
+        var flags = SCNetworkReachabilityFlags()
+
+        if SCNetworkReachabilityGetFlags(reachability, &flags) {
+            return flags
+        }
+
+        return nil
+    }
+
+    private let reachability: SCNetworkReachability
+    private var previousFlags: SCNetworkReachabilityFlags
+
+    // MARK: - Initialization
+
+    /// Creates a `NetworkReachabilityManager` instance with the specified host.
+    ///
+    /// - parameter host: The host used to evaluate network reachability.
+    ///
+    /// - returns: The new `NetworkReachabilityManager` instance.
+    public convenience init?(host: String) {
+        guard let reachability = SCNetworkReachabilityCreateWithName(nil, host) else { return nil }
+        self.init(reachability: reachability)
+    }
+
+    /// Creates a `NetworkReachabilityManager` instance that monitors the address 0.0.0.0.
+    ///
+    /// Reachability treats the 0.0.0.0 address as a special token that causes it to monitor the general routing
+    /// status of the device, both IPv4 and IPv6.
+    ///
+    /// - returns: The new `NetworkReachabilityManager` instance.
+    public convenience init?() {
+        var address = sockaddr_in()
+        address.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
+        address.sin_family = sa_family_t(AF_INET)
+
+        guard let reachability = withUnsafePointer(to: &address, { pointer in
+            return pointer.withMemoryRebound(to: sockaddr.self, capacity: MemoryLayout<sockaddr>.size) {
+                return SCNetworkReachabilityCreateWithAddress(nil, $0)
+            }
+        }) else { return nil }
+
+        self.init(reachability: reachability)
+    }
+
+    private init(reachability: SCNetworkReachability) {
+        self.reachability = reachability
+        self.previousFlags = SCNetworkReachabilityFlags()
+    }
+
+    deinit {
+        stopListening()
+    }
+
+    // MARK: - Listening
+
+    /// Starts listening for changes in network reachability status.
+    ///
+    /// - returns: `true` if listening was started successfully, `false` otherwise.
+    @discardableResult
+    public func startListening() -> Bool {
+        var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil)
+        context.info = Unmanaged.passUnretained(self).toOpaque()
+
+        let callbackEnabled = SCNetworkReachabilitySetCallback(
+            reachability,
+            { (_, flags, info) in
+                let reachability = Unmanaged<NetworkReachabilityManager>.fromOpaque(info!).takeUnretainedValue()
+                reachability.notifyListener(flags)
+            },
+            &context
+        )
+
+        let queueEnabled = SCNetworkReachabilitySetDispatchQueue(reachability, listenerQueue)
+
+        listenerQueue.async {
+            self.previousFlags = SCNetworkReachabilityFlags()
+            self.notifyListener(self.flags ?? SCNetworkReachabilityFlags())
+        }
+
+        return callbackEnabled && queueEnabled
+    }
+
+    /// Stops listening for changes in network reachability status.
+    public func stopListening() {
+        SCNetworkReachabilitySetCallback(reachability, nil, nil)
+        SCNetworkReachabilitySetDispatchQueue(reachability, nil)
+    }
+
+    // MARK: - Internal - Listener Notification
+
+    func notifyListener(_ flags: SCNetworkReachabilityFlags) {
+        guard previousFlags != flags else { return }
+        previousFlags = flags
+
+        listener?(networkReachabilityStatusForFlags(flags))
+    }
+
+    // MARK: - Internal - Network Reachability Status
+
+    func networkReachabilityStatusForFlags(_ flags: SCNetworkReachabilityFlags) -> NetworkReachabilityStatus {
+        guard isNetworkReachable(with: flags) else { return .notReachable }
+
+        var networkStatus: NetworkReachabilityStatus = .reachable(.ethernetOrWiFi)
+
+    #if os(iOS)
+        if flags.contains(.isWWAN) { networkStatus = .reachable(.wwan) }
+    #endif
+
+        return networkStatus
+    }
+
+    func isNetworkReachable(with flags: SCNetworkReachabilityFlags) -> Bool {
+        let isReachable = flags.contains(.reachable)
+        let needsConnection = flags.contains(.connectionRequired)
+        let canConnectAutomatically = flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic)
+        let canConnectWithoutUserInteraction = canConnectAutomatically && !flags.contains(.interventionRequired)
+
+        return isReachable && (!needsConnection || canConnectWithoutUserInteraction)
+    }
+}
+
+// MARK: -
+
+extension NetworkReachabilityManager.NetworkReachabilityStatus: Equatable {}
+
+/// Returns whether the two network reachability status values are equal.
+///
+/// - parameter lhs: The left-hand side value to compare.
+/// - parameter rhs: The right-hand side value to compare.
+///
+/// - returns: `true` if the two values are equal, `false` otherwise.
+public func ==(
+    lhs: NetworkReachabilityManager.NetworkReachabilityStatus,
+    rhs: NetworkReachabilityManager.NetworkReachabilityStatus)
+    -> Bool
+{
+    switch (lhs, rhs) {
+    case (.unknown, .unknown):
+        return true
+    case (.notReachable, .notReachable):
+        return true
+    case let (.reachable(lhsConnectionType), .reachable(rhsConnectionType)):
+        return lhsConnectionType == rhsConnectionType
+    default:
+        return false
+    }
+}
+
+#endif