Updater (#43)

.github/workflows/release.yml

@@ -28,6 +28,12 @@ jobs:
         HOST_PROFILE_DATA: ${{ secrets.HOST_PROFILE_DATA }}
         AGENT_PROFILE_DATA: ${{ secrets.AGENT_PROFILE_DATA }}
       run: ./.github/scripts/signing.sh
+    - name: Update Build Number
+      env:
+        TAG_NAME: ${{ github.ref }}
+      run: |
+            export CLEAN_TAG=$(echo $TAG_NAME | sed -e 's/v//')
+            sed -i '' -e "s/CI_VERSION = 0.0.0/CI_VERSION = $CLEAN_TAG/g" Config/Config.xcconfig
     - name: Build
       run: xcrun xcodebuild -project Secretive.xcodeproj -scheme Secretive -configuration Release -archivePath Archive.xcarchive archive
     - name: Create ZIPs

Config/Config.xcconfig

@@ -0,0 +1 @@
+CI_VERSION = 0.0.0

SecretAgent/Info.plist

@@ -17,7 +17,7 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>$(MARKETING_VERSION)</string>
+	<string>$(CI_VERSION)</string>
 	<key>CFBundleVersion</key>
 	<string>1</string>
 	<key>LSMinimumSystemVersion</key>

SecretAgentKit/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
+	<string>$(CI_VERSION)</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSHumanReadableCopyright</key>

SecretKit/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
+	<string>$(CI_VERSION)</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSHumanReadableCopyright</key>

Secretive.xcodeproj/project.pbxproj

@@ -30,6 +30,9 @@
 		506838A12415EA5600F55094 /* AnySecret.swift in Sources */ = {isa = PBXBuildFile; fileRef = 506838A02415EA5600F55094 /* AnySecret.swift */; };
 		506838A32415EA5D00F55094 /* AnySecretStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 506838A22415EA5D00F55094 /* AnySecretStore.swift */; };
 		506AB87E2412334700335D91 /* SecretAgent.app in CopyFiles */ = {isa = PBXBuildFile; fileRef = 50A3B78A24026B7500D209EA /* SecretAgent.app */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
+		50731666241DF8660023809E /* Updater.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50731665241DF8660023809E /* Updater.swift */; };
+		50731669241E00C20023809E /* NoticeView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50731668241E00C20023809E /* NoticeView.swift */; };
+		508A58AA241E06B40069DC07 /* PreviewUpdater.swift in Sources */ = {isa = PBXBuildFile; fileRef = 508A58A9241E06B40069DC07 /* PreviewUpdater.swift */; };
 		5099A02423FD2AAA0062B6F2 /* CreateSecretView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5099A02323FD2AAA0062B6F2 /* CreateSecretView.swift */; };
 		5099A02723FE34FA0062B6F2 /* SmartCard.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5099A02623FE34FA0062B6F2 /* SmartCard.swift */; };
 		5099A02923FE35240062B6F2 /* SmartCardStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5099A02823FE35240062B6F2 /* SmartCardStore.swift */; };
@@ -179,6 +182,10 @@
 		5068389D241471CD00F55094 /* SecretStoreList.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SecretStoreList.swift; sourceTree = "<group>"; };
 		506838A02415EA5600F55094 /* AnySecret.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnySecret.swift; sourceTree = "<group>"; };
 		506838A22415EA5D00F55094 /* AnySecretStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnySecretStore.swift; sourceTree = "<group>"; };
+		50731665241DF8660023809E /* Updater.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Updater.swift; sourceTree = "<group>"; };
+		50731668241E00C20023809E /* NoticeView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NoticeView.swift; sourceTree = "<group>"; };
+		508A58A9241E06B40069DC07 /* PreviewUpdater.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreviewUpdater.swift; sourceTree = "<group>"; };
+		508A58AB241E121B0069DC07 /* Config.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = Config.xcconfig; sourceTree = "<group>"; };
 		5099A02323FD2AAA0062B6F2 /* CreateSecretView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CreateSecretView.swift; sourceTree = "<group>"; };
 		5099A02623FE34FA0062B6F2 /* SmartCard.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SmartCard.swift; sourceTree = "<group>"; };
 		5099A02823FE35240062B6F2 /* SmartCardStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SmartCardStore.swift; sourceTree = "<group>"; };
@@ -274,6 +281,7 @@
 				50A3B78B24026B7500D209EA /* SecretAgent */,
 				5099A06D240242BA0062B6F2 /* SecretAgentKit */,
 				5099A07A240242BA0062B6F2 /* SecretAgentKitTests */,
+				508A58AF241E144C0069DC07 /* Config */,
 				50617D8023FCE48E0099B055 /* Products */,
 				5099A08B240243730062B6F2 /* Frameworks */,
 			);
@@ -298,11 +306,13 @@
 			children = (
 				50617D8223FCE48E0099B055 /* AppDelegate.swift */,
 				50617D8423FCE48E0099B055 /* ContentView.swift */,
+				50731668241E00C20023809E /* NoticeView.swift */,
 				50C385A42407A76D00AF2719 /* SecretDetailView.swift */,
 				5099A02323FD2AAA0062B6F2 /* CreateSecretView.swift */,
 				50B8550C24138C4F009958AC /* DeleteSecretView.swift */,
 				50BB046A2418AAAE00D6E079 /* EmptyStoreView.swift */,
 				50C385A8240B636500AF2719 /* SetupView.swift */,
+				50731665241DF8660023809E /* Updater.swift */,
 				50617D8623FCE48E0099B055 /* Assets.xcassets */,
 				50617D8B23FCE48E0099B055 /* Main.storyboard */,
 				50617D8E23FCE48E0099B055 /* Info.plist */,
@@ -317,6 +327,7 @@
 			children = (
 				50617D8923FCE48E0099B055 /* Preview Assets.xcassets */,
 				50617DD123FCEFA90099B055 /* PreviewStore.swift */,
+				508A58A9241E06B40069DC07 /* PreviewUpdater.swift */,
 			);
 			path = "Preview Content";
 			sourceTree = "<group>";
@@ -381,6 +392,14 @@
 			path = OpenSSH;
 			sourceTree = "<group>";
 		};
+		508A58AF241E144C0069DC07 /* Config */ = {
+			isa = PBXGroup;
+			children = (
+				508A58AB241E121B0069DC07 /* Config.xcconfig */,
+			);
+			path = Config;
+			sourceTree = "<group>";
+		};
 		5099A02523FE34DE0062B6F2 /* SmartCard */ = {
 			isa = PBXGroup;
 			children = (
@@ -735,9 +754,12 @@
 				50617DD223FCEFA90099B055 /* PreviewStore.swift in Sources */,
 				50C385A52407A76D00AF2719 /* SecretDetailView.swift in Sources */,
 				5099A02423FD2AAA0062B6F2 /* CreateSecretView.swift in Sources */,
+				50731666241DF8660023809E /* Updater.swift in Sources */,
 				50B8550D24138C4F009958AC /* DeleteSecretView.swift in Sources */,
 				50BB046B2418AAAE00D6E079 /* EmptyStoreView.swift in Sources */,
+				50731669241E00C20023809E /* NoticeView.swift in Sources */,
 				50617D8323FCE48E0099B055 /* AppDelegate.swift in Sources */,
+				508A58AA241E06B40069DC07 /* PreviewUpdater.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -871,6 +893,7 @@
 /* Begin XCBuildConfiguration section */
 		50617D9B23FCE48E0099B055 /* Debug */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 508A58AB241E121B0069DC07 /* Config.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -931,6 +954,7 @@
 		};
 		50617D9C23FCE48E0099B055 /* Release */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 508A58AB241E121B0069DC07 /* Config.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -991,6 +1015,7 @@
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_ASSET_PATHS = "\"Secretive/Preview Content\"";
 				DEVELOPMENT_TEAM = Z72PRUAWF6;
 				ENABLE_HARDENED_RUNTIME = YES;
@@ -1001,6 +1026,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.Host;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
@@ -1017,6 +1043,7 @@
 				CODE_SIGN_IDENTITY = "Developer ID Application";
 				CODE_SIGN_STYLE = Manual;
 				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_ASSET_PATHS = "\"Secretive/Preview Content\"";
 				DEVELOPMENT_TEAM = Z72PRUAWF6;
 				ENABLE_HARDENED_RUNTIME = YES;
@@ -1027,6 +1054,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
+				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.Host;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "Secretive - Host";
@@ -1293,7 +1321,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 0.1.0;
+				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.SecretAgent;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -1318,7 +1346,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.15;
-				MARKETING_VERSION = 0.1.0;
+				MARKETING_VERSION = 1;
 				PRODUCT_BUNDLE_IDENTIFIER = com.maxgoedjen.Secretive.SecretAgent;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "Secretive - Secret Agent";

Secretive/AppDelegate.swift

@@ -13,10 +13,11 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         list.add(store: SmartCard.Store())
         return list
     }()
+    let updater = PreviewUpdater()
 
     func applicationDidFinishLaunching(_ aNotification: Notification) {
 
-        let contentView = ContentView(storeList: storeList)
+        let contentView = ContentView(storeList: storeList, updater: updater)
         // Create the window and set the content view.
         window = NSWindow(
             contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),

Secretive/ContentView.swift

@@ -1,38 +1,44 @@
 import SwiftUI
 import SecretKit
 
-struct ContentView: View {
+struct ContentView<UpdaterType: UpdaterProtocol>: View {
     
     @ObservedObject var storeList: SecretStoreList
+    @ObservedObject var updater: UpdaterType
 
     @State fileprivate var active: AnySecret.ID?
     @State fileprivate var showingDeletion = false
     @State fileprivate var deletingSecret: AnySecret?
     
     var body: some View {
-        NavigationView {
+        VStack {
-            List(selection: $active) {
+            if updater.update != nil {
-                ForEach(storeList.stores) { store in
+                updateNotice()
-                    if store.isAvailable {
+            }
-                        Section(header: Text(store.name)) {
+            NavigationView {
-                            if store.secrets.isEmpty {
+                List(selection: $active) {
-                                if store is AnySecretStoreModifiable {
+                    ForEach(storeList.stores) { store in
-                                    NavigationLink(destination: EmptyStoreModifiableView(), tag: Constants.emptyStoreModifiableTag, selection: self.$active) {
+                        if store.isAvailable {
-                                        Text("No Secrets")
+                            Section(header: Text(store.name)) {
+                                if store.secrets.isEmpty {
+                                    if store is AnySecretStoreModifiable {
+                                        NavigationLink(destination: EmptyStoreModifiableView(), tag: Constants.emptyStoreModifiableTag, selection: self.$active) {
+                                            Text("No Secrets")
+                                        }
+                                    } else {
+                                        NavigationLink(destination: EmptyStoreView(), tag: Constants.emptyStoreTag, selection: self.$active) {
+                                            Text("No Secrets")
+                                        }
                                     }
                                 } else {
-                                    NavigationLink(destination: EmptyStoreView(), tag: Constants.emptyStoreTag, selection: self.$active) {
+                                    ForEach(store.secrets) { secret in
-                                        Text("No Secrets")
+                                        NavigationLink(destination: SecretDetailView(secret: secret), tag: secret.id, selection: self.$active) {
-                                    }
+                                            Text(secret.name)
-                                }
+                                        }.contextMenu {
-                            } else {
+                                            if store is AnySecretStoreModifiable {
-                                ForEach(store.secrets) { secret in
+                                                Button(action: { self.delete(secret: secret) }) {
-                                    NavigationLink(destination: SecretDetailView(secret: secret), tag: secret.id, selection: self.$active) {
+                                                    Text("Delete")
-                                        Text(secret.name)
+                                                }
-                                    }.contextMenu {
-                                        if store is AnySecretStoreModifiable {
-                                            Button(action: { self.delete(secret: secret) }) {
-                                                Text("Delete")
                                             }
                                         }
                                     }
@@ -40,30 +46,44 @@ struct ContentView: View {
                             }
                         }
                     }
+                }.onAppear {
+                    let fallback: AnyHashable
+                    if self.storeList.modifiableStore?.isAvailable ?? false {
+                        fallback = Constants.emptyStoreModifiableTag
+                    } else {
+                        fallback = Constants.emptyStoreTag
+                    }
+                    self.active = self.storeList.stores.compactMap { $0.secrets.first }.first?.id ?? fallback
                 }
-            }.onAppear {
+                .listStyle(SidebarListStyle())
-                let fallback: AnyHashable
+                .frame(minWidth: 100, idealWidth: 240)
-                if self.storeList.modifiableStore?.isAvailable ?? false {
-                    fallback = Constants.emptyStoreModifiableTag
-                } else {
-                    fallback = Constants.emptyStoreTag
-                }
-                self.active = self.storeList.stores.compactMap { $0.secrets.first }.first?.id ?? fallback
             }
-            .listStyle(SidebarListStyle())
+            .navigationViewStyle(DoubleColumnNavigationViewStyle())
-            .frame(minWidth: 100, idealWidth: 240)
+            .sheet(isPresented: $showingDeletion) {
-        }
+                if self.storeList.modifiableStore != nil {
-        .navigationViewStyle(DoubleColumnNavigationViewStyle())
+                    DeleteSecretView(secret: self.deletingSecret!, store: self.storeList.modifiableStore!) {
-        .sheet(isPresented: $showingDeletion) {
+                        self.showingDeletion = false
-            if self.storeList.modifiableStore != nil {
+                    }
-                DeleteSecretView(secret: self.deletingSecret!, store: self.storeList.modifiableStore!) {
-                    self.showingDeletion = false
                 }
             }
         }
-        
     }
 
+    func updateNotice() -> some View {
+        guard let update = updater.update else { return AnyView(Spacer()) }
+        let severity: NoticeView.Severity
+        let text: String
+        if update.critical {
+            severity = .critical
+            text = "Critical Security Update Required"
+        } else {
+            severity = .advisory
+            text = "Update Available"
+        }
+        return AnyView(NoticeView(text: text, severity: severity, actionTitle: "Update") {
+            NSWorkspace.shared.open(update.html_url)
+        })
+    }
 
     func delete<SecretType: Secret>(secret: SecretType) {
         deletingSecret = AnySecret(secret)
@@ -72,24 +92,23 @@ struct ContentView: View {
     
 }
 
-extension ContentView {
+fileprivate enum Constants {
-
+    static let emptyStoreModifiableTag: AnyHashable = "emptyStoreModifiableTag"
-    enum Constants {
+    static let emptyStoreTag: AnyHashable = "emptyStoreModifiableTag"
-        static let emptyStoreModifiableTag: AnyHashable = "emptyStoreModifiableTag"
-        static let emptyStoreTag: AnyHashable = "emptyStoreModifiableTag"
-    }
-
 }
 
+
 #if DEBUG
 
 struct ContentView_Previews: PreviewProvider {
     static var previews: some View {
         Group {
-            ContentView(storeList: Preview.storeList(stores: [Preview.Store(numberOfRandomSecrets: 0)], modifiableStores: [Preview.StoreModifiable(numberOfRandomSecrets: 0)]))
+            ContentView(storeList: Preview.storeList(stores: [Preview.Store(numberOfRandomSecrets: 0)], modifiableStores: [Preview.StoreModifiable(numberOfRandomSecrets: 0)]), updater: PreviewUpdater())
-            ContentView(storeList: Preview.storeList(stores: [Preview.Store()], modifiableStores: [Preview.StoreModifiable()]))
+            ContentView(storeList: Preview.storeList(stores: [Preview.Store()], modifiableStores: [Preview.StoreModifiable()]), updater: PreviewUpdater())
-            ContentView(storeList: Preview.storeList(stores: [Preview.Store()]))
+            ContentView(storeList: Preview.storeList(stores: [Preview.Store()]), updater: PreviewUpdater())
-            ContentView(storeList: Preview.storeList(modifiableStores: [Preview.StoreModifiable()]))
+            ContentView(storeList: Preview.storeList(modifiableStores: [Preview.StoreModifiable()]), updater: PreviewUpdater())
+            ContentView(storeList: Preview.storeList(stores: [Preview.Store(numberOfRandomSecrets: 0)], modifiableStores: [Preview.StoreModifiable(numberOfRandomSecrets: 0)]), updater: PreviewUpdater(update: .advisory))
+            ContentView(storeList: Preview.storeList(stores: [Preview.Store(numberOfRandomSecrets: 0)], modifiableStores: [Preview.StoreModifiable(numberOfRandomSecrets: 0)]), updater: PreviewUpdater(update: .critical))
         }
     }
 }

Secretive/Info.plist

@@ -17,9 +17,9 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
+	<string>$(CI_VERSION)</string>
 	<key>CFBundleVersion</key>
-	<string>1</string>
+	<string>$(CI_VERSION)</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
 	<key>NSHumanReadableCopyright</key>

Secretive/NoticeView.swift

@@ -0,0 +1,57 @@
+import Foundation
+import SwiftUI
+
+struct NoticeView: View {
+
+    let text: String
+    let severity: Severity
+    let actionTitle: String?
+    let action: (() -> Void)?
+
+    var body: some View {
+        HStack {
+            Text(text).bold()
+            Spacer()
+            if action != nil {
+                Button(action: action!) {
+                    Text(actionTitle!)
+                }
+            }
+            }.padding().background(color)
+    }
+
+    var color: Color {
+        switch severity {
+        case .advisory:
+            return Color.orange
+        case .critical:
+            return Color.red
+        }
+    }
+
+}
+
+extension NoticeView {
+
+    enum Severity {
+        case advisory, critical
+    }
+
+}
+
+#if DEBUG
+
+struct NoticeView_Previews: PreviewProvider {
+    static var previews: some View {
+        Group {
+            NoticeView(text: "Agent Not Running", severity: .advisory, actionTitle: "Run Setup") {
+                print("OK")
+            }
+            NoticeView(text: "Critical Security Update Required", severity: .critical, actionTitle: "Update") {
+                print("OK")
+            }
+        }
+    }
+}
+
+#endif

Secretive/Preview Content/PreviewUpdater.swift

@@ -0,0 +1,27 @@
+import Foundation
+import Combine
+
+class PreviewUpdater: UpdaterProtocol {
+
+    let update: Release?
+
+    init(update: Update = .none) {
+        switch update {
+        case .none:
+            self.update = nil
+        case .advisory:
+            self.update = Release(name: "10.10.10", html_url: URL(string: "https://example.com")!, body: "Some regular update")
+        case .critical:
+            self.update = Release(name: "10.10.10", html_url: URL(string: "https://example.com")!, body: "Critical Security Update")
+        }
+    }
+
+}
+
+extension PreviewUpdater {
+
+    enum Update {
+        case none, advisory, critical
+    }
+
+}

Secretive/Secretive.entitlements

@@ -6,6 +6,8 @@
 	<true/>
 	<key>com.apple.security.smartcard</key>
 	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
 	<key>keychain-access-groups</key>
 	<array>
 		<string>$(AppIdentifierPrefix)com.maxgoedjen.Secretive</string>

Secretive/Updater.swift

@@ -0,0 +1,82 @@
+import Foundation
+import Combine
+
+protocol UpdaterProtocol: ObservableObject {
+
+    var update: Release? { get }
+
+}
+
+class Updater: ObservableObject, UpdaterProtocol {
+
+    @Published var update: Release?
+
+    init() {
+        checkForUpdates()
+        let timer = Timer.scheduledTimer(withTimeInterval: 60*60*24, repeats: true) { _ in
+            self.checkForUpdates()
+        }
+        timer.tolerance = 60*60
+    }
+
+    func checkForUpdates() {
+        URLSession.shared.dataTask(with: Constants.updateURL) { data, _, _ in
+            guard let data = data else { return }
+            guard let release = try? JSONDecoder().decode(Release.self, from: data) else { return }
+            self.evaluate(release: release)
+        }.resume()
+    }
+
+    func evaluate(release: Release) {
+        let latestVersion = semVer(from: release.name)
+        let currentVersion = semVer(from: Bundle.main.infoDictionary!["CFBundleShortVersionString"] as! String)
+        for (latest, current) in zip(latestVersion, currentVersion) {
+            if latest > current {
+                DispatchQueue.main.async {
+                    self.update = release
+                }
+                return
+            }
+        }
+    }
+
+    func semVer(from stringVersion: String) -> [Int] {
+        var split = stringVersion.split(separator: ".").compactMap { Int($0) }
+        while split.count < 3 {
+            split.append(0)
+        }
+        return split
+    }
+
+}
+
+extension Updater {
+
+    enum Constants {
+        static let updateURL = URL(string: "https://api.github.com/repos/maxgoedjen/secretive/releases/latest")!
+    }
+
+}
+
+struct Release: Codable {
+    let name: String
+    let html_url: URL
+    let body: String
+}
+
+
+extension Release {
+
+    var critical: Bool {
+        return body.contains(Constants.securityContent)
+    }
+
+}
+
+extension Release {
+
+    enum Constants {
+        static let securityContent = "Critical Security Update"
+    }
+
+}