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+// NetworkReachabilityManager.swift
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+//
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+// Copyright (c) 2014–2016 Alamofire Software Foundation (http://alamofire.org/)
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+//
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+// Permission is hereby granted, free of charge, to any person obtaining a copy
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+// of this software and associated documentation files (the "Software"), to deal
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+// in the Software without restriction, including without limitation the rights
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+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+// copies of the Software, and to permit persons to whom the Software is
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+// furnished to do so, subject to the following conditions:
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+//
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+// The above copyright notice and this permission notice shall be included in
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+// all copies or substantial portions of the Software.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+// THE SOFTWARE.
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+
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+import Foundation
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+import SystemConfiguration
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+
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+public let NetworkReachabilityStatusDidChangeNotification = "com.alamofire.network.reachability.status.did.change"
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+
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+public enum NetworkReachabilityStatus: Int {
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+ case Unknown = -1
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+ case NotReachable = 0
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+ case ReachableOnWWAN = 1
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+ case ReachableOnWiFi = 2
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+}
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+
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+public class NetworkReachabilityManager {
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+ public typealias Listener = NetworkReachabilityStatus -> Void
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+
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+ // MARK: - Properties
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+
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+ public var isReachable: Bool { return isReachableOnWWAN || isReachableOnWiFi }
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+ public var isReachableOnWWAN: Bool { return networkReachabilityStatus == .ReachableOnWWAN }
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+ public var isReachableOnWiFi: Bool { return networkReachabilityStatus == .ReachableOnWiFi }
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+
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+ public var networkReachabilityStatus: NetworkReachabilityStatus {
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+ guard let flags = self.flags else { return .Unknown }
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+ return networkReachabilityStatusForFlags(flags)
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+ }
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+
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+ public var listenerQueue: dispatch_queue_t = dispatch_get_main_queue()
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+ public var listener: Listener?
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+
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+ private var flags: SCNetworkReachabilityFlags? {
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+ var flags = SCNetworkReachabilityFlags()
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+
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+ if SCNetworkReachabilityGetFlags(reachability, &flags) {
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+ return flags
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+ }
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+
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+ return nil
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+ }
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+
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+ private let reachability: SCNetworkReachability
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+ private var previousFlags: SCNetworkReachabilityFlags
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+
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+ // MARK: - Initialization
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+
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+ public convenience init?(host: String) {
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+ guard let reachability = SCNetworkReachabilityCreateWithName(nil, host) else { return nil }
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+ self.init(reachability: reachability)
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+ }
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+
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+ public convenience init?() {
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+ var address = sockaddr_in6()
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+ address.sin6_len = UInt8(sizeofValue(address))
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+ address.sin6_family = sa_family_t(AF_INET6)
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+
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+ guard let reachability = withUnsafePointer(&address, {
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+ SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
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+ }) else { return nil }
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+
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+ self.init(reachability: reachability)
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+ }
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+
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+ private init(reachability: SCNetworkReachability) {
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+ self.reachability = reachability
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+ self.previousFlags = SCNetworkReachabilityFlags()
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+ }
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+
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+ deinit {
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+ stopListening()
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+ }
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+
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+ // MARK: - Listening
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+
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+ public func startListening() -> Bool {
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+ var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil)
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+ context.info = UnsafeMutablePointer(Unmanaged.passUnretained(self).toOpaque())
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+
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+ let callbackEnabled = SCNetworkReachabilitySetCallback(
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+ reachability,
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+ { (_, flags, info) in
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+ let reachability = Unmanaged<NetworkReachabilityManager>.fromOpaque(COpaquePointer(info)).takeUnretainedValue()
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+ reachability.notifyListener(flags)
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+ },
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+ &context
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+ )
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+
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+ let queueEnabled = SCNetworkReachabilitySetDispatchQueue(reachability, listenerQueue)
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+
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+ dispatch_async(listenerQueue) {
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+ self.notifyListener(self.flags ?? SCNetworkReachabilityFlags())
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+ }
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+
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+ return callbackEnabled && queueEnabled
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+ }
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+
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+ public func stopListening() {
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+ SCNetworkReachabilitySetCallback(reachability, nil, nil)
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+ SCNetworkReachabilitySetDispatchQueue(reachability, nil)
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+ }
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+
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+ // MARK: - Internal - Listener Notification
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+
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+ func notifyListener(flags: SCNetworkReachabilityFlags) {
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+ guard previousFlags != flags else { return }
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+ previousFlags = flags
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+
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+ let networkReachabilityStatus = networkReachabilityStatusForFlags(flags)
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+
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+ listener?(networkReachabilityStatus)
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+
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+ dispatch_async(dispatch_get_main_queue()) {
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+ NSNotificationCenter.defaultCenter().postNotificationName(
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+ NetworkReachabilityStatusDidChangeNotification,
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+ object: networkReachabilityStatus.rawValue
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+ )
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+ }
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+ }
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+
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+ // MARK: - Internal - Network Reachability Status
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+
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+ func networkReachabilityStatusForFlags(flags: SCNetworkReachabilityFlags) -> NetworkReachabilityStatus {
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+ guard flags.contains(.Reachable) else { return .NotReachable }
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+
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+ var networkStatus: NetworkReachabilityStatus = .NotReachable
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+
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+ if !flags.contains(.ConnectionRequired) { networkStatus = .ReachableOnWiFi }
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+
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+ if flags.contains(.ConnectionOnDemand) || flags.contains(.ConnectionOnTraffic) {
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+ if !flags.contains(.InterventionRequired) { networkStatus = .ReachableOnWiFi }
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+ }
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+
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+ #if os(iOS)
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+ if flags.contains(.IsWWAN) { networkStatus = .ReachableOnWWAN }
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+ #endif
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+
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+ return networkStatus
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+ }
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+}
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Christian Noon