Apply some Swift 4 cleanup

WordPressKit.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name          = "WordPressKit"
-  s.version       = "2.1.0"
+  s.version       = "2.1.1-beta.1"
   s.summary       = "WordPressKit offers a clean and simple WordPress.com and WordPress.org API."
 
   s.description   = <<-DESC

WordPressKit.xcodeproj/project.pbxproj

@@ -2663,7 +2663,6 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -2689,7 +2688,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.automattic.WordPressKit;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -2710,7 +2708,6 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "WordPressKitTests/WordPressKitTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -2730,7 +2727,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.automattic.WordPressKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "WordPressKitTests/WordPressKitTests-Bridging-Header.h";
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -2812,7 +2808,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.automattic.WordPressKit;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
 			};
 			name = "Release-Internal";
 		};
@@ -2832,7 +2827,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.automattic.WordPressKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "WordPressKitTests/WordPressKitTests-Bridging-Header.h";
-				SWIFT_VERSION = 4.2;
 			};
 			name = "Release-Internal";
 		};
@@ -2914,7 +2908,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.automattic.WordPressKit;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
 			};
 			name = "Release-Alpha";
 		};
@@ -2934,7 +2927,6 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.automattic.WordPressKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "WordPressKitTests/WordPressKitTests-Bridging-Header.h";
-				SWIFT_VERSION = 4.2;
 			};
 			name = "Release-Alpha";
 		};

WordPressKit/AccountSettingsRemote.swift

@@ -123,7 +123,7 @@ public class AccountSettingsRemote: ServiceRemoteWordPressComREST {
         })
     }
 
-    fileprivate func settingsFromResponse(_ responseObject: AnyObject) throws -> AccountSettings {
+    private func settingsFromResponse(_ responseObject: AnyObject) throws -> AccountSettings {
         guard let
             response = responseObject as? [String: AnyObject],
             let firstName = response["first_name"] as? String,
@@ -158,7 +158,7 @@ public class AccountSettingsRemote: ServiceRemoteWordPressComREST {
                                tracksOptOut: tracksOptOut)
     }
 
-    fileprivate func fieldNameForChange(_ change: AccountSettingsChange) -> String {
+    private func fieldNameForChange(_ change: AccountSettingsChange) -> String {
         switch change {
         case .firstName:
             return "first_name"

WordPressKit/GravatarServiceRemote.swift

@@ -93,7 +93,7 @@ open class GravatarServiceRemote {
 
     /// Returns a new (randomized) Boundary String
     ///
-    fileprivate func boundaryForRequest() -> String {
+    private func boundaryForRequest() -> String {
         return "Boundary-" + UUID().uuidString
     }
 
@@ -107,7 +107,7 @@ open class GravatarServiceRemote {
     ///
     /// - Returns: A NSData instance, containing the Request's Payload.
     ///
-    fileprivate func bodyWithGravatarData(_ gravatarData: Data, account: String, boundary: String) -> Data {
+    private func bodyWithGravatarData(_ gravatarData: Data, account: String, boundary: String) -> Data {
         let body = NSMutableData()
 
         // Image Payload
@@ -131,7 +131,7 @@ open class GravatarServiceRemote {
 
 
     // MARK: - Private Structs
-    fileprivate struct UploadParameters {
+    private struct UploadParameters {
         static let endpointURL          = "https://api.gravatar.com/v1/upload-image"
         static let HTTPMethod           = "POST"
         static let contentType          = "application/octet-stream"

WordPressKit/HTTPAuthenticationAlertController.swift

@@ -7,7 +7,7 @@ open class HTTPAuthenticationAlertController {
 
     public typealias AuthenticationHandler = (URLSession.AuthChallengeDisposition, URLCredential?) -> Void
 
-    fileprivate static var onGoingChallenges = [URLProtectionSpace: [AuthenticationHandler]]()
+    private static var onGoingChallenges = [URLProtectionSpace: [AuthenticationHandler]]()
 
     static public func controller(for challenge: URLAuthenticationChallenge, handler: @escaping AuthenticationHandler) -> UIAlertController? {
         if var handlers = onGoingChallenges[challenge.protectionSpace] {
@@ -35,7 +35,7 @@ open class HTTPAuthenticationAlertController {
         onGoingChallenges.removeValue(forKey: challenge.protectionSpace)
     }
 
-    static fileprivate func controllerForServerTrustChallenge(_ challenge: URLAuthenticationChallenge) -> UIAlertController {
+    private static func controllerForServerTrustChallenge(_ challenge: URLAuthenticationChallenge) -> UIAlertController {
         let title = NSLocalizedString("Certificate error", comment: "Popup title for wrong SSL certificate.")
         let message = String(format: NSLocalizedString("The certificate for this server is invalid. You might be connecting to a server that is pretending to be “%@” which could put your confidential information at risk.\n\nWould you like to trust the certificate anyway?", comment: ""), challenge.protectionSpace.host)
         let controller =  UIAlertController(title: title, message: message, preferredStyle: .alert)
@@ -58,7 +58,7 @@ open class HTTPAuthenticationAlertController {
         return controller
     }
 
-    static fileprivate func controllerForUserAuthenticationChallenge(_ challenge: URLAuthenticationChallenge) -> UIAlertController {
+    private static func controllerForUserAuthenticationChallenge(_ challenge: URLAuthenticationChallenge) -> UIAlertController {
         let title = String(format: NSLocalizedString("Authentication required for host: %@", comment: "Popup title to ask for user credentials."), challenge.protectionSpace.host)
         let message = NSLocalizedString("Please enter your credentials", comment: "Popup message to ask for user credentials (fields shown below).")
         let controller =  UIAlertController(title: title,

WordPressKit/NotificationSyncServiceRemote.swift

@@ -5,7 +5,7 @@ import Foundation
 public class NotificationSyncServiceRemote: ServiceRemoteWordPressComREST {
     // MARK: - Constants
     //
-    fileprivate let defaultPageSize = 100
+    private let defaultPageSize = 100
 
 
     // MARK: - Errors

WordPressKit/PluginServiceRemote.swift

@@ -182,7 +182,7 @@ public class PluginServiceRemote: ServiceRemoteWordPressComREST {
     }
 }
 
-fileprivate extension PluginServiceRemote {
+private extension PluginServiceRemote {
     func encoded(pluginID: String) -> String? {
         let allowedCharacters = CharacterSet.urlPathAllowed.subtracting(CharacterSet(charactersIn: "/"))
         guard let escapedPluginID = pluginID.addingPercentEncoding(withAllowedCharacters: allowedCharacters) else {

WordPressKit/RemoteBlogSettings.swift

@@ -209,6 +209,6 @@ public class RemoteBlogSettings: NSObject {
 
     // MARK: - Private
 
-    fileprivate static let AscendingStringValue     = "asc"
-    fileprivate static let DescendingStringValue    = "desc"
+    private static let AscendingStringValue     = "asc"
+    private static let DescendingStringValue    = "desc"
 }

WordPressKit/RemoteNotificationSettings.swift

@@ -67,7 +67,7 @@ open class RemoteNotificationSettings {
         ///
         /// - Returns: A native Swift dictionary, containing only the Boolean entries
         ///
-        fileprivate func filterNonBooleanEntries(_ dictionary: NSDictionary?) -> [String : Bool] {
+        private func filterNonBooleanEntries(_ dictionary: NSDictionary?) -> [String : Bool] {
             var filtered = [String: Bool]()
             if dictionary == nil {
                 return filtered
@@ -114,7 +114,7 @@ open class RemoteNotificationSettings {
     ///     - channel: The communications channel that uses the current settings
     ///     - settings: Raw dictionary containing the remote settings response
     ///
-    fileprivate init(channel: Channel, settings: NSDictionary?) {
+    private init(channel: Channel, settings: NSDictionary?) {
         self.channel = channel
         self.streams = Stream.fromDictionary(settings)
     }
@@ -124,7 +124,7 @@ open class RemoteNotificationSettings {
     ///
     /// - Parameter wpcomSettings: Dictionary containing the collection of WordPress.com Settings
     ///
-    fileprivate init(wpcomSettings: NSDictionary?) {
+    private init(wpcomSettings: NSDictionary?) {
         // WordPress.com is a special scenario: It contains just one (unspecified) stream: Email
         self.channel = Channel.wordPressCom
         self.streams = [ Stream(kind: .Email, preferences: wpcomSettings) ]
@@ -135,7 +135,7 @@ open class RemoteNotificationSettings {
     ///
     /// - Parameter blogSettings: Dictionary containing the collection of settings for a single blog
     ///
-    fileprivate convenience init(blogSettings: NSDictionary?) {
+    private convenience init(blogSettings: NSDictionary?) {
         let blogId = blogSettings?["blog_id"] as? Int ?? Int.max
         self.init(channel: Channel.blog(blogId: blogId), settings: blogSettings)
     }
@@ -145,7 +145,7 @@ open class RemoteNotificationSettings {
     ///
     /// - Parameter otherSettings: Dictionary containing the collection of "Other Settings"
     ///
-    fileprivate convenience init(otherSettings: NSDictionary?) {
+    private convenience init(otherSettings: NSDictionary?) {
         self.init(channel: Channel.other, settings: otherSettings)
     }
 

WordPressKit/SharingServiceRemote.swift

@@ -154,7 +154,7 @@ open class SharingServiceRemote: ServiceRemoteWordPressComREST {
     ///
     /// - Returns: An array of KeyringConnectionExternalUser instances.
     ///
-    fileprivate func externalUsersForKeyringConnection(_ externalUsers: NSArray) -> [KeyringConnectionExternalUser] {
+    private func externalUsersForKeyringConnection(_ externalUsers: NSArray) -> [KeyringConnectionExternalUser] {
         let arr: [KeyringConnectionExternalUser] = externalUsers.map { (dict) -> KeyringConnectionExternalUser in
             let externalUser = KeyringConnectionExternalUser()
             externalUser.externalID = (dict as AnyObject).string(forKey: ConnectionDictionaryKeys.externalID) ?? externalUser.externalID
@@ -364,7 +364,7 @@ open class SharingServiceRemote: ServiceRemoteWordPressComREST {
     ///
     /// - Returns: A `RemotePublicizeConnection` object.
     ///
-    fileprivate func remotePublicizeConnectionFromDictionary(_ dict: NSDictionary) -> RemotePublicizeConnection? {
+    private func remotePublicizeConnectionFromDictionary(_ dict: NSDictionary) -> RemotePublicizeConnection? {
         guard let connectionID = dict.number(forKey: ConnectionDictionaryKeys.ID) else {
             return nil
         }
@@ -486,7 +486,7 @@ open class SharingServiceRemote: ServiceRemoteWordPressComREST {
     ///
     /// - Returns: An array of `RemoteSharingButton` objects.
     ///
-    fileprivate func remoteSharingButtonsFromDictionary(_ buttons: NSArray) -> [RemoteSharingButton] {
+    private func remoteSharingButtonsFromDictionary(_ buttons: NSArray) -> [RemoteSharingButton] {
         var order = 0
         let sharingButtons: [RemoteSharingButton] = buttons.map { (dict) -> RemoteSharingButton in
             let btn = RemoteSharingButton()
@@ -510,7 +510,7 @@ open class SharingServiceRemote: ServiceRemoteWordPressComREST {
     }
 
 
-    fileprivate func dictionariesFromRemoteSharingButtons(_ buttons: [RemoteSharingButton]) -> [NSDictionary] {
+    private func dictionariesFromRemoteSharingButtons(_ buttons: [RemoteSharingButton]) -> [NSDictionary] {
         return buttons.map({ (btn) -> NSDictionary in
 
             let dict = NSMutableDictionary()

WordPressKit/SiteManagementServiceRemote.swift

@@ -124,14 +124,14 @@ open class SiteManagementServiceRemote: ServiceRemoteWordPressComREST {
 
     /// Keys found in API results
     ///
-    fileprivate struct ResultKey {
+    private struct ResultKey {
         static let Status = "status"
         static let Active = "active"
     }
 
     /// Values found in API results
     ///
-    fileprivate struct ResultValue {
+    private struct ResultValue {
         static let Deleted = "deleted"
         static let Running = "running"
     }

WordPressKit/WordPressComOAuthClient.swift

@@ -39,26 +39,26 @@ public final class WordPressComOAuthClient: NSObject {
 
     @objc public static let WordPressComSocialLoginEndpointVersion = 1.0
 
-    fileprivate let clientID: String
-    fileprivate let secret: String
+    private let clientID: String
+    private let secret: String
 
-    fileprivate let oauth2SessionManager: SessionManager = {
+    private let oauth2SessionManager: SessionManager = {
         return WordPressComOAuthClient.sessionManager()
     }()
 
-    fileprivate let socialSessionManager: SessionManager = {
+    private let socialSessionManager: SessionManager = {
         return WordPressComOAuthClient.sessionManager()
     }()
 
-    fileprivate let social2FASessionManager: SessionManager = {
+    private let social2FASessionManager: SessionManager = {
         return WordPressComOAuthClient.sessionManager()
     }()
 
-    fileprivate let socialNewSMS2FASessionManager: SessionManager = {
+    private let socialNewSMS2FASessionManager: SessionManager = {
         return WordPressComOAuthClient.sessionManager()
     }()
 
-    fileprivate class func sessionManager() -> SessionManager {
+    private class func sessionManager() -> SessionManager {
         let configuration = URLSessionConfiguration.ephemeral
         configuration.httpAdditionalHeaders = ["Accept": "application/json"]
         let sessionManager = SessionManager(configuration: .ephemeral)
@@ -391,7 +391,7 @@ public final class WordPressComOAuthClient: NSObject {
             })
     }
 
-    fileprivate func cleanedUpResponseForLogging(_ response: AnyObject) -> AnyObject {
+    private func cleanedUpResponseForLogging(_ response: AnyObject) -> AnyObject {
         guard var responseDictionary = response as? [String: AnyObject],
             let _ = responseDictionary["access_token"]
             else {